Low Power, Rail-to-Rail Output,
Video Op Amp with Ultralow Power Disable
ADA4853-1
Rev. 0
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other
rights of third parties that may result from its use. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarks and registered trademarks are the property of their respective owners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
www.analog.com
Fax: 781.461.3113
2006 Analog Devices, Inc. All rights reserved.
FEATURES
Ultralow power-down current: 1 A
Low quiescent current: 1.4 mA
Ideal for standard definition video
High speed
100 MHz, -3 dB bandwidth
120 V/s slew rate
0.5 dB flatness: 22 MHz
Differential gain: 0.26%
Differential phase: 0.10
Single-supply operation
Output swings to within 250 mV of either rail
Rail-to-rail output
Low voltage offset: 2 mV
Wide supply range: 2.65 V to 5 V
APPLICATIONS
Portable multimedia players
Video cameras
Digital still cameras
Consumer video
PIN CONFIGURATION
V
OUT
1
+IN
3
2
ADA4853-1
TOP VIEW
(Not to Scale)
V
S
+V
S
6
IN
4
5
POWER DOWN
0
588
4-
0
01
Figure 1. 6-Lead SC70
GENERAL DESCRIPTION
The ADA4853-1 is a low power, low cost, high speed, rail-to-
rail output op amp with ultralow power disable that is ideal
for portable consumer electronics. Despite its low price, the
ADA4853-1 provides excellent overall performance and
versatility. The 100 MHz, -3 dB bandwidth and 120 V/s slew
rate make this amplifier well suited for many general-purpose,
high speed applications.
The ADA4853-1 voltage feedback op amp is designed to operate
at supply voltages as low as 2.65 V and up to 5 V using only 1.4 mA
of supply current. To further reduce power consumption, the
amplifier is equipped with a power-down mode, which lowers the
supply current to less than 150 nA max, making it ideal in battery-
powered applications.
The ADA4853-1 provides users with a true single-supply
capability, allowing input signals to extend 200 mV below the
negative rail and to within 1.2 V of the positive rail. On the output,
the amplifier can swing within 150 mV of either supply rail.
With its combination of low price, excellent differential gain
(0.26%), differential phase (0.10), and 0.5 dB flatness out to
22 MHz, this amplifier is ideal for video applications.
The ADA4853-1 is available in a 6-lead SC70 package and is
designed to work in the extended industrial temperature range
(-40C to +85C).
6.5
6.4
6.3
6.2
6.1
6.0
5.9
5.8
5.7
5.6
5.5
0.1
1
10
40
FREQUENCY (MHz)
CL
O
SED-
L
O
O
P
G
AIN
(
d
B
)
V
S
= 5V
R
L
= 150
G = +2
0.1V p-p
2.0V p-p
05
88
4-
0
10
Figure 2. 0.5 dB Flatness Frequency Response
ADA4853-1
Rev. 0 | Page 2 of 16
TABLE OF CONTENTS
Features .............................................................................................. 1
Applications....................................................................................... 1
Pin Configuration............................................................................. 1
General Description ......................................................................... 1
Revision History ............................................................................... 2
Specifications..................................................................................... 3
Specifications with 3 V Supply ................................................... 3
Specifications with 5 V Supply ................................................... 4
Absolute Maximum Ratings............................................................ 5
Thermal Resistance ...................................................................... 5
ESD Caution.................................................................................. 5
Typical Performance Characteristics ..............................................6
Circuit Description......................................................................... 12
Headroom Considerations........................................................ 12
Overload Behavior and Recovery ............................................ 12
Applications..................................................................................... 13
Single-Supply Video Amplifier................................................. 13
Power Supply Bypassing ............................................................ 13
Layout .......................................................................................... 13
Outline Dimensions ....................................................................... 14
Ordering Guide .......................................................................... 14
REVISION HISTORY
1/06--Revision 0: Initial Version
ADA4853-1
Rev. 0 | Page 3 of 16
SPECIFICATIONS
SPECIFICATIONS WITH 3 V SUPPLY
T
A
= 25C, R
F
= 1 k, R
G
= 1 k for G = +2, R
L
= 150 , unless otherwise noted.
Table 1.
Parameter Conditions
Min
Typ
Max
Unit
DYNAMIC PERFORMANCE
-3 dB Bandwidth
G = +1, V
O
= 0.1 V p-p
90
MHz
G = +2, V
O
= 2 V p-p
32
MHz
Bandwidth for 0.1 dB Flatness
G = +2, V
O
= 2 V p-p, R
L
= 150
8
MHz
Settling Time to 0.1%
V
O
= 2 V step
45
ns
Slew Rate
G = +2, V
O
= 2 V step
95
100
V/s
NOISE/DISTORTION PERFORMANCE
Differential Gain
R
L
= 150
0.26
%
Differential Phase
R
L
= 150
0.10
Degrees
Input Voltage Noise
f = 100 kHz
22
nV/Hz
Input Current Noise
f = 100 kHz
2.2
pA/Hz
DC PERFORMANCE
Input Offset Voltage
2
3.3
mV
Input Offset Voltage Drift
1.6
V/C
Input Bias Current
1.0
1.5
A
Input Bias Current Drift
4
nA/C
Input Bias Offset Current
50
nA
Open-Loop Gain
V
O
= 0.5 V to 2.5 V
72
80
dB
INPUT CHARACTERISTICS
Input Resistance
Differential/common mode
0.5/20
M
Input Capacitance
0.6
pF
Input Common-Mode Voltage Range
-0.2 to +V
CC
- 1.2
V
Input Overdrive Recovery Time (Rise/Fall)
V
IN
= -0.5 V to +3.5 V, G = +1
40
ns
Common-Mode Rejection Ratio
V
CM
= 0.5 V
76
85
dB
POWER-DOWN
Power-Down Input Voltage
Power-down
1.2
V
Turn-Off Time
1.2
s
Turn-On Time
110
ns
Power-Down Bias Current
Enabled Power-down
=
3.0
V
25
30
A
Power-Down Power-down
=
0
V
0.01
A
OUTPUT
CHARACTERISTICS
Output Overdrive Recovery Time
V
IN
= -0.25 to +1.75 V, G = +2
50
ns
Output Voltage Swing
R
L
= 150
0.3 to 2.8
0.15 to 2.88
V
Short-Circuit Current
Sinking/sourcing
120/100
mA
POWER SUPPLY
Operating Range
2.65
5
V
Quiescent Current
1.3
1.4
mA
Quiescent Current (Power-Down)
Power-down = low
1.5
A
Positive Power Supply Rejection
+V
S
= +1.5 V to +2.5 V, -V
S
= -1.5 V
-76
-86
dB
Negative Power Supply Rejection
-V
S
= -1.5 V to -2.5 V, +V
S
= +1.5 V
-79
-88
dB
ADA4853-1
Rev. 0 | Page 4 of 16
SPECIFICATIONS WITH 5 V SUPPLY
T
A
= 25C, R
F
= 1 k, R
G
= 1 k for G = +2, R
L
= 150 , unless otherwise noted.
Table 2.
Parameter Conditions
Min
Typ
Max
Unit
DYNAMIC PERFORMANCE
-3 dB Bandwidth
G = +1, V
O
= 0.1 V p-p
100
MHz
G = +2, V
O
= 2 V p-p
32
MHz
Bandwidth for 0.1 dB Flatness
G = +2, V
O
= 2 V p-p
8
MHz
Settling Time to 0.1%
V
O
= 2 V step
54
ns
Slew Rate
G = +2, V
O
= 2 V step
100
120
V/s
NOISE/DISTORTION PERFORMANCE
Differential Gain
R
L
= 150
0.33
%
Differential Phase
R
L
= 150
0.10
Degrees
Input Voltage Noise
f = 100 kHz
22
nV/Hz
Input Current Noise
f = 100 kHz
2.2
pA/Hz
DC PERFORMANCE
Input Offset Voltage
2
3.3
mV
Input Offset Voltage Drift
1.6
V/C
Input Bias Current
1.0
1.5
A
Input Bias Current Drift
4
nA/C
Input Bias Offset Current
60
nA
Open-Loop Gain
V
O
= 0.5 V to 4.5 V
72
80
dB
INPUT CHARACTERISTICS
Input Resistance
Differential/common mode
0.5/20
M
Input Capacitance
0.6
pF
Input Common-Mode Voltage Range
-0.2 to +V
CC
- 1.2
V
Input Overdrive Recovery Time (Rise/Fall)
V
IN
= -0.5 V to +5.5 V, G = +1
40
ns
Common-Mode Rejection Ratio
V
CM
= 0.5 V
-79
-88
dB
POWER-DOWN
Power-Down Input Voltage
Power-down
1.2
V
Turn-Off Time
0.9
s
Turn-On Time
100
ns
Power-Down Bias Current
Enabled Power-down
=
5
V
40
50
A
Power-Down Power-down
=
0
V
0.01
A
OUTPUT CHARACTERISTICS
Output Overdrive Recovery Time
V
IN
= -0.25 V to +2.75 V, G = +2
50
ns
Output Voltage Swing
R
L
= 75
0.45 to 4.55
0.1 to 4.8
V
Short-Circuit Current
Sinking/sourcing
135/105
mA
POWER SUPPLY
Operating Range
2.65
5
V
Quiescent Current
1.4
1.5
mA
Quiescent Current (Power-Down)
Power-down = low
1.5
A
Positive Power Supply Rejection
+V
S
= +2.5 V to +3.5 V, -V
S
= -2.5 V
-75
-80
dB
Negative Power Supply Rejection
-V
S
= -2.5 V to -3.5 V, +V
S
= +2.5 V
-75
-80
dB
ADA4853-1
Rev. 0 | Page 5 of 16
ABSOLUTE MAXIMUM RATINGS
Table 3.
Parameter Rating
Supply Voltage
5.5 V
Power Dissipation
See Figure 3
Common-Mode Input Voltage
-V
S
+ 1 V to +V
S
- 1 V
Differential Input Voltage
V
S
Storage Temperature Range
-65C to +125C
Operating Temperature Range
-40C to +85C
Lead Temperature
JEDEC J-STD-20
Junction Temperature
150C
Stresses above those listed under Absolute Maximum Ratings
may cause permanent damage to the device. This is a stress
rating only; functional operation of the device at these or any
other conditions above those indicated in the operational
section of this specification is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect
device reliability.
THERMAL RESISTANCE
JA
is specified for the worst-case conditions, that is,
JA
is
specified for device soldered in circuit board for surface-mount
packages.
Table 4. Thermal Resistance
Package Type
JA
Unit
6-Lead SC70
430
C/W
Maximum Power Dissipation
The maximum safe power dissipation for the ADA4853-1 is
limited by the associated rise in junction temperature (T
J
) on
the die. At approximately 150C, which is the glass transition
temperature, the plastic changes its properties. Even temporarily
exceeding this temperature limit can change the stresses that the
package exerts on the die, permanently shifting the parametric
performance of the amplifiers. Exceeding a junction temperature of
150C for an extended period can result in changes in silicon
devices, potentially causing degradation or loss of functionality.
The power dissipated in the package (P
D
) for a sine wave and a
resistor load is the total power consumed from the supply
minus the load power.
P
D
= Total Power Consumed - Load Power
(
)
L
OUT
CURRENT
SUPPLY
VOLTAGE
SUPPLY
D
R
V
I
V
P
2
=
RMS output voltages should be considered.
Airflow increases heat dissipation, effectively reducing
JA
.
In addition, more metal directly in contact with the package
leads and through holes under the device reduces
JA
.
Figure 3 shows the maximum safe power dissipation in the
package vs. the ambient temperature for the 6-lead SC70
(430C/W) on a JEDEC standard 4-layer board.
JA
values are
approximations.
05
88
4-
0
44
AMBIENT TEMPERATURE (C)
MA
XI
M
U
M
P
O
W
E
R
DI
SS
I
P
A
T
IO
N
(
W)
0
0.1
0.2
0.3
0.4
0.5
40
15
10
35
60
85
Figure 3. Maximum Power Dissipation vs. Temperature for a 4-Layer Board
ESD CAUTION
ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily accumulate on
the human body and test equipment and can discharge without detection. Although this product features
proprietary ESD protection circuitry, permanent damage may occur on devices subjected to high energy
electrostatic discharges. Therefore, proper ESD precautions are recommended to avoid performance
degradation or loss of functionality.
ADA4853-1
Rev. 0 | Page 6 of 16
TYPICAL PERFORMANCE CHARACTERISTICS
FREQUENCY (MHz)
NO
RM
AL
I
Z
E
D CL
O
S
E
D-
L
O
O
P
G
A
I
N (
d
B)
2
1
0
1
3
5
2
4
6
V
S
= 5V
R
L
= 150
V
OUT
= 0.1V p-p
G = 1
G = +2
G = +10
0
58
84-
006
0.1
1
10
100
200
Figure 4. Small Signal Frequency Response for Various Gains
V
S
= 5V
G = +1
V
OUT
= 0.1V p-p
R
L
= 75
FREQUENCY (MHz)
CL
OS
E
D
-
L
O
O
P
G
A
I
N
(
d
B
)
3
2
0
1
1
2
3
4
5
6
0.1
1
10
100 200
R
L
= 150
R
L
= 1k
0
58
84
-
00
7
Figure 5. Small Signal Frequency Response for Various Loads
FREQUENCY (MHz)
CL
O
S
E
D
-L
O
O
P
G
AIN
(
dB)
4
3
2
1
1
0
4
5
3
2
6
0.1
1
10
100 200
G = +1
R
L
= 150
V
OUT
= 0.1V p-p
V
S
= 3V
V
S
= 5V
0
588
4-
008
Figure 6. Small Signal Frequency Response for Various Supplies
R
L
C
L
R
SNUB
5
3
4
0
3
4
5
2
1
1
2
6
0.1
1
10
100 200
FREQUENCY (MHz)
C
L
OS
E
D
-LO
O
P
GA
IN
(
d
B
)
V
S
= 5V
R
L
= 150
V
OUT
= 0.1V p-p
G = +1
C
L
= 0pF
C
L
= 5pF
C
L
= 10pF
05
88
4-
0
09
C
L
= 10pF/25 SNUB
Figure 7. Small Signal Frequency Response for Various Capacitive Loads
6.5
6.4
6.3
6.2
6.1
6.0
5.9
5.8
5.7
5.6
5.5
0.1
1
10
40
FREQUENCY (MHz)
CL
O
SED-
L
O
O
P
G
AIN
(
d
B
)
V
S
= 5V
R
L
= 150
G = +2
0.1V p-p
2.0V p-p
05
88
4-
0
10
Figure 8. 0.1 dB Flatness Response for Various Output Voltages
FREQUENCY (MHz)
1
0
1
2
3
4
5
6
NO
RM
AL
I
Z
E
D
CL
O
S
E
D
-
L
O
O
P
G
AI
N
(
dB)
0.1
1
10
100
1000
V
S
= 5V
R
L
= 150
V
OUT
= 2V p-p
G = 1
G = +2
G = +10
05
88
4-
0
11
Figure 9. Large Signal Frequency Response for Various Gains
ADA4853-1
Rev. 0 | Page 7 of 16
CL
O
S
E
D
-
L
O
O
P
G
AI
N
(d
B)
7
6
5
4
3
2
1
0
FREQUENCY (MHz)
0.1
1
10
100
1000
V
S
= 5V
V
OUT
= 2V p-p
G = +2
R
L
= 1k
R
L
= 75
R
L
= 150
05
88
4-
0
12
Figure 10. Large Signal Frequency Response for Various Loads
C
L
OS
E
D
-
L
OO
P
G
A
I
N
(
d
B
)
5
3
4
2
1
0
1
2
3
4
5
6
FREQUENCY (MHz)
0.1
1
10
100 200
V
S
= 3V
R
L
= 150
V
OUT
= 0.1V p-p
G = +1
+25C
+85C
40C
05
88
4-
0
13
Figure 11. Small Signal Frequency Response for Various Temperatures
FREQUENCY (MHz)
4
3
2
0
1
1
2
4
3
6
5
0.1
1
10
100 200
V
S
= 5V
R
L
= 150
V
OUT
= 0.1V p-p
G = +1
C
L
O
S
ED
-L
O
O
P G
A
I
N
(d
B
)
+25C
+85C
40C
05
88
4-
0
14
Figure 12. Small Signal Frequency Response for Various Temperatures
250
200
100
150
50
0
0
0.5
1.5
2.5
3.5
1.0
2.0
3.0
4.0
OUTPUT VOLTAGE STEP (V)
SL
EW
R
A
T
E(
V
/s
)
058
84
-
01
5
POSITIVE SLEW RATE
NEGATIVE SLEW RATE
G = +2
V
S
= 5V
R
L
= 150
Figure 13. Slew Rate vs. Output Voltage
140
120
100
80
60
40
20
0
20
0
240
210
180
150
120
90
60
30
100
1k
10k
100k
1M
10M
100M
OP
E
N
-
L
OOP
GA
IN
(dB
)
O
P
E
N
-
L
O
O
P
P
HAS
E
(
D
e
g
r
ees)
FREQUENCY (Hz)
05
88
4-
029
V
S
= 5V
R
L
= 1k
PHASE
GAIN
Figure 14. Open-Loop Gain and Phase vs. Frequency
20
90
80
70
60
50
40
30
100
1k
10k
100k
1M
10M
100M
CO
M
M
O
N-
M
O
DE
RE
J
E
CT
I
O
N (
d
B)
FREQUENCY (Hz)
05
88
4-
030
V
S
= 5V
Figure 15. Common-Mode Rejection vs. Frequency
ADA4853-1
Rev. 0 | Page 8 of 16
0
90
80
70
60
50
40
20
10
30
100
1k
10k
100k
1M
10M
100M
P
O
W
E
R S
U
P
P
L
Y
RE
JE
CT
I
O
N (
d
B
)
FREQUENCY (Hz)
05
88
4-
031
V
S
= 5V
PSR
+PSR
Figure 16. Power Supply Rejection vs. Frequency
1000
0.01
0.1
1
10
100
100
1k
10k
100k
1M
10M
100M
CL
O
S
E
D-
L
O
O
P
O
UT
P
UT
I
M
P
E
DANCE
(
)
FREQUENCY (Hz)
05
88
4-
032
V
S
= 5V
G = +1
Figure 17. Output Impedance vs. Frequency Enabled
FREQUENCY (MHz)
40
50
70
60
80
90
100
110
0.1
1
10
G = +2
V
S
= 3V
V
OUT
= 2V p-p
R
L
= 1k HD3
R
L
= 1k HD2
R
L
= 150 HD3
R
L
= 150 HD2
HA
R
M
O
NI
C
DI
S
T
O
RT
I
O
N
(
d
Bc
)
05
88
4-
0
16
Figure 18. Harmonic Distortion vs. Frequency
G = +2
V
S
= 5V
V
OUT
= 2V p-p
R
L
= 1k HD3
R
L
= 1k HD2
R
L
= 150 HD2
R
L
= 150 HD3
40
50
70
60
80
90
100
120
110
0.1
1
10
FREQUENCY (MHz)
HA
R
M
O
N
IC
D
IS
TOR
T
ION
(
d
B
c
)
05
88
4-
0
17
Figure 19. Harmonic Distortion vs. Frequency
G = +1
V
S
= 5V
V
OUT
= 2V p-p
R
L
= 75 HD3
R
L
= 75 HD2
R
L
= 150 HD2
R
L
= 150 HD3
R
L
= 1k HD3
R
L =
1k HD2
40
50
70
60
80
90
100
120
110
0.1
1
10
FREQUENCY (MHz)
HA
R
M
O
NI
C
D
I
S
T
O
RT
I
O
N
(
d
B
c)
0
58
84
-
01
8
Figure 20. Harmonic Distortion vs. Frequency
0
1
2
3
HD2
HD3
4
V
OUT
(V p-p)
40
50
70
60
80
90
100
120
110
HA
R
M
O
NI
C
D
I
S
T
O
RT
I
O
N
(
d
B
c)
05
884
-
0
19
2V
5V
GND
G = +1
V
S
= 5V
R
L
= 150
f = 100kHz
Figure 21. Harmonic Distortion for Various Output Voltages
ADA4853-1
Rev. 0 | Page 9 of 16
O
UT
P
UT
V
O
L
T
AG
E
(
V
)
05
88
4-
03
3
G = +2
R
L
= 150
25ns/DIV
V
S
= 3V
V
S
= 5V
2.60
2.40
2.42
2.44
2.46
2.48
2.50
2.52
2.54
2.56
2.58
Figure 22. Small Signal Pulse Response for Various Supplies
2.60
2.40
2.42
2.44
2.46
2.48
2.50
2.52
2.54
2.56
2.58
O
UT
P
UT
V
O
L
T
AG
E
(
V
)
05
88
4-
03
4
V
S
= 5V
R
L
= 150
25ns/DIV
G = +2; C
L
= 0pF, 20pF
G = +1; C
L
= 15pF
Figure 23. Small Signal Pulse Response for Various Capacitive Loads
O
UT
P
UT
V
O
L
T
AG
E
(
V
)
05
88
4-
03
5
G = +2
R
L
= 150
25ns/DIV
V
S
= 3V, 5V
3.75
1.25
1.50
1.75
2.00
2.25
2.50
2.75
3.00
3.25
3.50
Figure 24. Large Signal Pulse Response for Various Supplies
3.75
1.25
1.50
1.75
2.00
2.25
2.50
2.75
3.00
3.25
3.50
O
UT
P
UT
V
O
L
T
AG
E
(
V
)
05
88
4-
03
6
G = +2
V
S
= 5V
R
L
= 150
25ns/DIV
C
L
= 0pF, 20pF
Figure 25. Large Signal Pulse Response for Various Capacitive Loads
100ns/DIV
5.5
5.0
4.5
4.0
3.5
3.0
2.5
1.5
2.0
1.0
0.5
0
0.5
I
NP
UT
AND O
UT
P
UT
V
O
L
T
AG
E
(
V
)
OUTPUT
2 INPUT
G = +2
V
S
= 5V
R
L
= 1k
f = 1MHz
05
88
4-
0
20
Figure 26. Output Overdrive Recovery
I
NP
UT
AND O
UT
P
UT
V
O
L
T
AG
E
(
V
)
OUTPUT
INPUT
G = +1
V
S
= 5V
R
L
= 1k
f = 1MHz
05
88
4-
0
21
5.5
5.0
4.5
4.0
3.5
3.0
2.5
1.5
2.0
1.0
0.5
0
0.5
100ns/DIV
Figure 27. Input Overdrive Recovery
ADA4853-1
Rev. 0 | Page 10 of 16
1000
1
10
100
10
100
1k
10k
100k
1M
10M
VO
L
T
A
G
E N
O
I
SE (
n
V/
H
z
)
FREQUENCY (Hz)
05
88
4-
037
Figure 28. Voltage Noise vs. Frequency
100
1
10
10
100
1k
10k
100k
1M
10M
CU
RRE
NT
NO
I
S
E
(
p
A/
H
z
)
FREQUENCY (Hz)
05
88
4-
038
Figure 29. Current Noise vs. Frequency
20
18
16
14
12
10
8
6
4
2
0
4
4
3
2
1
1
3
0
2
CO
UNT
V
OFFSET
(mV)
05
88
4-
0
42
V
S
= 5V
N = 155
x = 0.370mV
= 0.782
Figure 30. V
OS
Distribution
0.6
0.8
1.0
1.2
1.4
1.6
1.8
2.0
1.0 0.5
0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
V
CM
(V)
V
OS
(m
V
)
0
58
84
-
02
2
V
S
= 5V
Figure 31. V
OS
vs. Common-Mode Voltage
1.5
1.0
0.5
0
0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
5.0
POWER DOWN VOLTAGE (V)
S
UP
P
L
Y
CU
RRE
NT
(
m
A)
V
S
= 5V, T = +25C
V
S
= 5V, T = +85C
V
S
= 5V, T = 40C
V
S
= 3V, T = +25C
V
S
= 3V, T = 40C
05
884
-
02
3
V
S
= 3V, T = +85C
Figure 32. Supply Current vs. POWER DOWN Voltage
0.6
0.7
0.8
0.9
1.0
50
25
0
25
50
75
100
TEMPERATURE (C)
I
N
PU
T
O
F
F
SET
VO
L
T
A
G
E (
m
V
)
V
S
= 5V
V
S
= 3V
05
88
4-
02
6
Figure 33. Input Offset Voltage vs. Temperature
ADA4853-1
Rev. 0 | Page 11 of 16
50
25
0
25
50
75
100
TEMPERATURE (C)
I
NP
UT
CURRE
NT
(
A)
0.90
0.88
0.86
0.84
0.82
0.80
0.78
0.76
0.74
0.72
0.70
V
S
= 5V
V
S
= 3V
05
88
4-
0
27
+
I
B
I
B
Figure 34. Input Bias Current vs. Temperature
3.0
2.8
2.6
2.4
0.6
0.4
0.2
0
10
100
10k
1k
O
U
T
P
U
T
V
O
LTA
GE
(
V
)
LOAD RESISTANCE ()
05
88
4-
039
POSITIVE SWING
LOAD RESISTANCE TIED
TO MIDSUPPLY
NEGATIVE SWING
V
S
= 3V
Figure 35. Output Swing vs. Load Resistance
5.0
4.8
4.6
4.4
0.6
0.4
0.2
0
10
100
10k
1k
O
U
T
P
U
T
V
O
LTA
GE
(
V
)
LOAD RESISTANCE ()
05
88
4-
040
POSITIVE SWING
V
S
= 5V
LOAD RESISTANCE TIED
TO MIDSUPPLY
NEGATIVE SWING
Figure 36. Output Swing vs. Load Resistance
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
0
5
10
15
20
25
30
35
40
45
50
O
UT
P
UT
S
AT
URA
T
I
O
N V
O
L
T
AG
E
(
V
)
LOAD CURRENT (mA)
05
88
4-
041
+V
SAT
V
S
= 3V
V
S
= 5V
V
SAT
Figure 37. Output Saturation Voltage vs. Load Current
0.001
(+0.1%)
0.001
(0.1%)
0
10 20 30 40 50 60 70 80 90 100 110 120 130 140 150
05
88
4-
0
45
TIME (ns)
VO
L
T
A
G
E (V)
1.9
2.0
2.1
2.2
2.3
2.4
2.5
2.6
2.7
2.8
2.9
3.0
3.1
V
S
= 5V
R
L
= 150
V
OUTPUT
2V
INPUT
2V
INPUT
V
OUTPUT
2V
IN
P
U
T
V
OU
T
P
U
T
(V
)
Figure 38. 0.1% Settling Time
6
5
4
2
3
1
0
3
2
1
0
1
0
1
2
3
4
5
6
7
8
9
10
05
88
4-
0
46
P
O
W
E
R DO
W
N
P
I
N V
O
L
T
AG
E
(
V
)
OUT
P
UT
VOL
T
AGE
(
V)
TIME (s)
POWER DOWN
V
OUT
G = +2
V
S
= 5V
f
IN
= 100kHz
Figure 39. Enable/Disable Time
ADA4853-1
Rev. 0 | Page 12 of 16
CIRCUIT DESCRIPTION
The ADA4853-1 features a high slew rate input stage that is a
true single-supply topology, capable of sensing signals at or
below the minus supply rail. The rail-to-rail output stage can
pull within 100 mV of either supply rail when driving light
loads and within 0.22 V when driving 150 . High speed
performance is maintained at supply voltages as low as 2.65 V.
HEADROOM CONSIDERATIONS
This amplifier is designed for use in low voltage systems. To
obtain optimum performance, it is useful to understand the
behavior of the amplifiers as input and output signals approach
the amplifier's headroom limits. The amplifier's input common-
mode voltage range extends from the negative supply voltage
(actually 200 mV below this), or from ground for single-supply
operation, to within 1.2 V of the positive supply voltage.
Exceeding the headroom limit is not a concern for any inverting
gain on any supply voltage, as long as the reference voltage at
the amplifier's positive input lies within the amplifier's input
common-mode range.
The input stage is the headroom limit for signals approaching
the positive rail. Figure 40 shows a typical offset voltage vs.
the input common-mode voltage for the ADA4853-1 on a
5 V supply. Accurate dc performance is maintained from
approximately 200 mV below the minus supply to within 1.2 V
of the positive supply. For high speed signals, however, there are
other considerations. As the common-mode voltage gets within
1.2 V of positive supply, the amplifier responds well but the
bandwidth begins to drop as the common-mode voltage
approaches the positive supply. This can manifest itself in
increased distortion or settling time. Higher frequency signals
require more headroom than the lower frequencies to maintain
distortion performance.
0.6
0.8
1.0
1.2
1.4
1.6
1.8
2.0
1.0 0.5
0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
V
CM
(V)
V
OS
(m
V)
0
58
84
-
02
2
V
S
= 5V
Figure 40. V
OS
vs. Common-Mode Voltage, V
S
= 5 V
For signals approaching the minus supply and inverting gain
and high positive gain configurations, the headroom limit is the
output stage. The ADA4853-1 uses a common emitter output
stage. This output stage maximizes the available output range,
limited by the saturation voltage of the output transistors. The
saturation voltage increases with the drive current that the
output transistor is required to supply due to the output
transistor's collector resistance.
As the saturation point of the output stage is approached, the
output signal shows increasing amounts of compression and
clipping. As in the input headroom case, higher frequency
signals require a bit more headroom than the lower frequency
signals. Figure 21 illustrates this point by plotting the typical
distortion vs. the output amplitude.
OVERLOAD BEHAVIOR AND RECOVERY
Input
The specified input common-mode voltage of the ADA4853-1
is 200 mV below the negative supply to within 1.2 V of the
positive supply. Exceeding the top limit results in lower bandwidth
and increased rise time. Pushing the input voltage of a unity-
gain follower to less than 1.2 V from the positive supply leads to
an increasing amount of output error as well as a much increased
settling time. The recovery time from input voltages 1.2 V or
closer to the positive supply is approximately 40 ns, which is
limited by the settling artifacts caused by transistors in the input
stage coming out of saturation.
The amplifiers do not exhibit phase reversal, even for input
voltages beyond the voltage supply rails. Going more than 0.6 V
beyond the power supplies turns on protection diodes at the
input stage, which greatly increases the current draw of the
devices.
ADA4853-1
Rev. 0 | Page 13 of 16
APPLICATIONS
SINGLE-SUPPLY VIDEO AMPLIFIER
With low differential gain and phase errors and wide 0.1 dB
flatness, the ADA4853-1 is an ideal solution for video
applications. Figure 41 shows a typical video driver set for a
noninverting gain of +2, where R
F
= R
G
= 1 k. The video
amplifier input is terminated into a shunt 75 resistor. At the
output, the amplifier has a series 75 resistor for impedance
matching to the video load.
When operating in low voltage, single-supply applications, the
input signal is only limited by the input stage headroom.
75 CABLE
V
OUT
75
75
V
IN
R
G
R
F
+V
S
P
D
U1
C1
2.2F
C2
0.01F
0
58
84
-
0
43
+
V
Figure 41. Video Amplifier
POWER SUPPLY BYPASSING
Attention must be paid to bypassing the power supply pins of
the ADA4853-1. High quality capacitors with low equivalent
series resistance (ESR), such as multilayer ceramic capacitors
(MLCCs), should be used to minimize supply voltage ripple and
power dissipation. A large, usually tantalum, 2.2 F to 47 F
capacitor located in proximity to the ADA4853-1 is required to
provide good decoupling for lower frequency signals. The
actual value is determined by the circuit transient and frequency
requirements. In addition, 0.1 F MLCC decoupling capacitors
should be located as close to each of the power supply pins as is
physically possible, no more than inch away. The ground
returns should terminate immediately into the ground plane.
Locating the bypass capacitor return close to the load return
minimizes ground loops and improves performance.
LAYOUT
As is the case with all high speed applications, careful attention
to printed circuit board (PCB) layout details prevents associated
board parasitics from becoming problematic. The ADA4853-1
can operate up to 100 MHz; therefore, proper RF design
techniques must be employed. The PCB should have a
ground plane covering all unused portions of the component
side of the board to provide a low impedance return path.
Removing the ground plane on all layers from the area near
and under the input and output pins reduces stray capacitance.
Signal lines connecting the feedback and gain resistors should
be kept as short as possible to minimize the inductance and
stray capacitance associated with these traces. Termination
resistors and loads should be located as close as possible to their
respective inputs and outputs. Input and output traces should
be kept as far apart as possible to minimize coupling (crosstalk)
through the board. Adherence to microstrip or stripline design
techniques for long signal traces (greater than 1 inch) is
recommended. For more information on high speed board
layout, go to:
www.analog.com
and
www.analog.com/library/analogDialogue/archives/39-
09/layout.html
.
ADA4853-1
Rev. 0 | Page 14 of 16
OUTLINE DIMENSIONS
COMPLIANT TO JEDEC STANDARDS MO-203-AB
0.22
0.08
0.30
0.15
1.00
0.90
0.70
SEATING
PLANE
4
5
6
3
2
1
PIN 1
0.65 BSC
1.30 BSC
0.10 MAX
0.10 COPLANARITY
0.40
0.10
1.10
0.80
2.20
2.00
1.80
2.40
2.10
1.80
1.35
1.25
1.15
0.46
0.36
0.26
Figure 42. 6-Lead Thin Shrink Small Outline Transistor Package [SC70]
(KS-6)
Dimensions shown in millimeters
ORDERING GUIDE
Model
Temperature
Range Package
Description
Ordering
Quantity
Package
Option Branding
ADA4853-1AKSZ-R2
1
40C to +85C
6-Lead Thin Shrink Small Outline Transistor Package (SC70)
250
KS-6
HEC
ADA4853-1AKSZ-R7
1
40C to +85C
6-Lead Thin Shrink Small Outline Transistor Package (SC70)
3,000
KS-6
HEC
ADA4853-1AKSZ-RL
1
40C to +85C
6-Lead Thin Shrink Small Outline Transistor Package (SC70)
10,000
KS-6
HEC
1
Z = Pb-free part.
ADA4853-1
Rev. 0 | Page 15 of 16
NOTES
ADA4853-1
Rev. 0 | Page 16 of 16
NOTES
2006 Analog Devices, Inc. All rights reserved. Trademarks and
registered trademarks are the property of their respective owners.
D05884-0-1/06(0)
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