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FUNCTIONAL BLOCK DIAGRAM
15-Lead Through-Hole SIP (Y) and Surface-Mount
DDPAK(VR)
NC
NC
NC
+IN1
IN1
OUT1
V
S
+V
S
OUT2
IN2
+IN2
NC
NC
NC
NC
1
2
3
4
5
6
7
8
9
15
11
12
13
14
10
AD815
TAB IS
+V
S
NC = NO CONNECT
REFER TO PAGE 3 FOR 24-LEAD SOIC PACKAGE
REV. B
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
which may result from its use. No license is granted by implication or
otherwise under any patent or patent rights of Analog Devices.
a
High Output Current
Differential Driver
AD815
PRODUCT DESCRIPTION
The AD815 consists of two high speed amplifiers capable of
supplying a minimum of 500 mA. They are typically configured
as a differential driver enabling an output signal of 40 V p-p on
15 V supplies. This can be increased further with the use of a
FEATURES
Flexible Configuration
Differential Input and Output Driver
or Two Single-Ended Drivers
High Output Power
Power Package
26 dBm Differential Line Drive for ADSL Application
40 V p-p Differential Output Voltage, R
L
= 50
500 mA Minimum Output Drive/Amp, R
L
= 5
Thermally Enhanced SOIC
400 mA Minimum Output Drive/Amp, R
L
= 10
Low Distortion
66 dB @ 1 MHz THD, R
L
= 200
, V
OUT
= 40 V p-p
0.05% and 0.45 Differential Gain and Phase, R
L
= 25
(6 Back-Terminated Video Loads)
High Speed
120 MHz Bandwidth (3 dB)
900 V/ s Differential Slew Rate
70 ns Settling Time to 0.1%
Thermal Shutdown
APPLICATIONS
ADSL, HDSL and VDSL Line Interface Driver
Coil or Transformer Driver
CRT Convergence and Astigmatism Adjustment
Video Distribution Amp
Twisted Pair Cable Driver
FREQUENCY Hz
40
50
110
100
10M
1k
TOTAL HARMONIC DISTORTION dBc
10k
100k
1M
60
70
80
90
100
V
S
= 15V
G = +10
V
OUT
= 40V p-p
R
L
= 50
(DIFFERENTIAL)
R
L
=
200
(DIFFERENTIAL)
Total Harmonic Distortion vs. Frequency
AMP1
+15V
15V
R
L
120
110
499
V
OUT
=
40Vp-p
V
IN
=
4Vp-p
1/2
AD815
1/2
AD815
G = +10
100
100
AMP2
V
D
=
40Vp-p
1:2
TRANSFORMER
R
1
= 15
R
2
= 15
499
Subscriber Line Differential Driver
coupling transformer with a greater than 1:1 turns ratio. The
low harmonic distortion of 66 dB @ 1 MHz into 200
combined with the wide bandwidth and high current drive make
the differential driver ideal for communication applications such
as subscriber line interfaces for ADSL, HDSL and VDSL.
The AD815 differential slew rate of 900 V/
s and high load drive
are suitable for fast dynamic control of coils or transformers,
and the video performance of 0.05% and 0.45
differential gain
and phase into a load of 25
enable up to 12 back-terminated
loads to be driven.
Three package styles are available, and all work over the
industrial temperature range (40
C to +85
C). Maximum
output power is achieved with the power package available for
through-hole mounting (Y) and surface-mounting (VR). The
24-lead SOIC (RB) is capable of driving 26 dBm for full rate
ADSL with proper heat sinking.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700
World Wide Web Site: http://www.analog.com
Fax: 781/326-8703
Analog Devices, Inc., 1999
AD815SPECIFICATIONS
AD815A
Model
Conditions
V
S
Min
Typ
Max
Units
DYNAMIC PERFORMANCE
Small Signal Bandwidth (3 dB)
G = +1
15
100
120
MHz
G = +1
5
90
110
MHz
Bandwidth (0.1 dB)
G = +2
15
40
MHz
G = +2
5
10
MHz
Differential Slew Rate
V
OUT
= 20 V p-p, G = +2
15
800
900
V/
s
Settling Time to 0.1%
10 V Step, G = +2
15
70
ns
NOISE/HARMONIC PERFORMANCE
Total Harmonic Distortion
f = 1 MHz, R
LOAD
= 200
, V
OUT
= 40 V p-p
15
66
dBc
Input Voltage Noise
f = 10
kHz, G = +2 (Single Ended)
5,
15
1.85
nV/
Hz
Input Current Noise (+I
IN
)
f = 10 kHz, G = +2
5,
15
1.8
pA/
Hz
Input Current Noise (I
IN
)
f = 10 kHz, G = +2
5,
15
19
pA/
Hz
Differential Gain Error
NTSC, G = +2, R
LOAD
= 25
15
0.05
%
Differential Phase Error
NTSC, G = +2, R
LOAD
= 25
15
0.45
Degrees
DC PERFORMANCE
Input Offset Voltage
5
5
8
mV
15
10
15
mV
T
MIN
T
MAX
30
mV
Input Offset Voltage Drift
20
V/
C
Differential Offset Voltage
5
0.5
2
mV
15
0.5
4
mV
T
MIN
T
MAX
5
mV
Differential Offset Voltage Drift
10
V/
C
Input Bias Current
5,
15
10
90
A
T
MIN
T
MAX
150
A
+Input Bias Current
5,
15
2
5
A
T
MIN
T
MAX
5
A
Differential Input Bias Current
5,
15
10
75
A
T
MIN
T
MAX
100
A
Open-Loop Transresistance
5,
15
1.0
5.0
M
T
MIN
T
MAX
0.5
M
INPUT CHARACTERISTICS
Differential Input Resistance
+Input
15
7
M
Input
15
Differential Input Capacitance
15
1.4
pF
Input Common-Mode Voltage Range
15
13.5
V
5
3.5
V
Common-Mode Rejection Ratio
T
MIN
T
MAX
5,
15
57
65
dB
Differential Common-Mode Rejection Ratio
T
MIN
T
MAX
5,
15
80
100
dB
OUTPUT CHARACTERISTICS
Voltage Swing
Single Ended, R
LOAD
= 25
15
11.0
11.7
V
5
1.1
1.8
V
Differential, R
LOAD
= 50
15
21
23
V
T
MIN
T
MAX
15
22.5
24.5
V
Output Current
1, 2
VR, Y
R
LOAD
= 5
15
500
750
mA
5
350
400
mA
RB-24
R
LOAD
= 10
15
400
500
mA
Short Circuit Current
15
1.0
A
Output Resistance
15
13
MATCHING CHARACTERISTICS
Crosstalk
f = 1 MHz
15
65
dB
POWER SUPPLY
Operating Range
3
T
MIN
T
MAX
18
V
Quiescent Current
5
23
30
mA
15
30
40
mA
T
MIN
T
MAX
5
40
mA
15
55
mA
Power Supply Rejection Ratio
T
MIN
T
MAX
5,
15
55
66
dB
NOTES
1
Output current is limited in the 24-lead SOIC package to the maximum power dissipation. See absolute maximum ratings and derating curves.
2
See Figure 12 for bandwidth, gain, output drive recommended operation range.
3
Observe derating curves for maximum junction temperature.
Specifications subject to change without notice.
REV. B
2
(@ T
A
= +25 C, V
S
= 15 V dc, R
FB
= 1 k
and R
LOAD
= 100
unless otherwise noted)
AD815
REV. B
3
MAXIMUM POWER DISSIPATION
The maximum power that can be safely dissipated by the AD815
is limited by the associated rise in junction temperature. The
maximum safe junction temperature for the plastic encapsulated
parts is determined by the glass transition temperature of the
plastic, about 150
C. Exceeding this limit temporarily may
cause a shift in parametric performance due to a change in the
stresses exerted on the die by the package. Exceeding a junction
temperature of 175
C for an extended period can result in
device failure.
The AD815 has thermal shutdown protection, which guarantees
that the maximum junction temperature of the die remains below a
safe level, even when the output is shorted to ground. Shorting
the output to either power supply will result in device failure.
To ensure proper operation, it is important to observe the
derating curves and refer to the section on power considerations.
It must also be noted that in high (noninverting) gain configurations
(with low values of gain resistor), a high level of input overdrive
can result in a large input error current, which may result in a
significant power dissipation in the input stage. This power
must be included when computing the junction temperature rise
due to total internal power.
AMBIENT TEMPERATURE C
14
7
4
50
90
40
MAXIMUM POWER DISSIPATION Watts
30 20 10
10
20 30
40
50 60
70 80
13
8
6
5
11
9
12
10
0
T
J
= 150 C
3
2
1
0
AD815 AVR, AY
JA
= 41 C/W
(STILL AIR = 0FT/MIN)
NO HEAT SINK
JA
= 52 C/W
(STILL AIR = 0 FT/MIN)
NO HEAT SINK
AD815ARB-24
JA
= 16 C/W
SOLDERED DOWN TO
COPPER HEAT SINK
(STILL AIR = 0FT/MIN)
AD815 AVR, AY
Plot of Maximum Power Dissipation vs. Temperature
ABSOLUTE MAXIMUM RATINGS
1
Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . .
18 V Total
Internal Power Dissipation
2
Plastic (Y and VR) . . 3.05 Watts (Observe Derating Curves)
Small Outline (RB) . . 2.4 Watts (Observe Derating Curves)
Input Voltage (Common Mode) . . . . . . . . . . . . . . . . . . . .
V
S
Differential Input Voltage . . . . . . . . . . . . . . . . . . . . . . . .
6 V
Output Short Circuit Duration
. . . . . . . . . . . . . . . . . . . . . . Observe Power Derating Curves
Can Only Short to Ground
Storage Temperature Range
Y, VR and RB Package . . . . . . . . . . . . . . . 65
C to +125
C
Operating Temperature Range
AD815A . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
C to +85
C
Lead Temperature Range (Soldering, 10 sec) . . . . . . . +300
C
NOTES
1
Stresses above those listed under Absolute Maximum Ratings may cause perma-
nent 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.
2
Specification is for device in free air with 0 ft/min air flow: 15-Lead Through-Hole
and Surface Mount:
JA
= 41
C/W; 24-Lead Surface Mount:
JA
= 52
C/W.
PIN CONFIGURATION
24-Lead Thermally-Enhanced SOIC (RB-24)
TOP VIEW
(Not to Scale)
AD815
13
16
15
14
24
23
22
21
20
19
18
17
12
11
10
9
8
1
2
3
4
7
6
5
NC = NO CONNECT
NC
NC
NC
NC
NC
NC
NC
NC
+IN1
IN1
IN2
+IN2
OUT1
V
S
OUT2
+V
S
*HEAT TABS ARE CONNECTED TO THE POSITIVE SUPPLY.
THERMAL
HEAT TABS
+V
S
*
THERMAL
HEAT TABS
+V
S
*
ORDERING GUIDE
Model
Temperature Range
Package Description
Package Option
AD815ARB-24
40
C to +85
C
24-Lead Thermally Enhanced SOIC
RB-24
AD815ARB-24-REEL
40
C to +85
C
24-Lead Thermally Enhanced SOIC
RB-24
AD815AVR
40
C to +85
C
15-Lead Surface Mount DDPAK
VR-15
AD815AY
40
C to +85
C
15-Lead Through-Hole SIP with Staggered Leads and 90
Lead Form
Y-15
AD815AYS
40
C to +85
C
15-Lead Through-Hole SIP with Staggered Leads and Straight Lead Form
YS-15
AD815-EB
Evaluation Board
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 the AD815 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.
WARNING!
ESD SENSITIVE DEVICE
AD815
REV. B
4
AD815Typical Performance Characteristics
JUNCTION TEMPERATURE C
40
100
20
0
20
40
60
80
36
34
18
SUPPLY CURRENT mA
26
24
22
20
30
28
32
V
S
= 15V
V
S
= 5V
Figure 4. Total Supply Current vs. Temperature
SUPPLY VOLTAGE Volts
33
30
18
0
16
2
TOTAL SUPPLY CURRENT mA
4
6
8
10
12
14
27
24
21
T
A
= +25 C
Figure 5. Total Supply Current vs. Supply Voltage
JUNCTION TEMPERATURE C
40
100
20
0
20
40
60
80
10
0
80
INPUT BIAS CURRENT
A
40
50
60
70
20
30
10
SIDE B
SIDE A
SIDE A, B
+I
B
I
B
I
B
SIDE A
SIDE B
V
S
= 15V, 5V
V
S
= 5V
V
S
= 15V
Figure 6. Input Bias Current vs. Temperature
SUPPLY VOLTAGE Volts
20
15
0
0
20
5
COMMON-MODE VOLTAGE RANGE
Volts
10
15
10
5
Figure 1. Input Common-Mode Voltage Range vs. Supply
Voltage
SUPPLY VOLTAGE Volts
40
30
0
0
20
5
10
15
20
10
80
60
0
40
20
NO LOAD
R
L
= 50
(DIFFERENTIAL)
R
L
= 25
(SINGLE-ENDED)
SINGLE-ENDED OUTPUT VOLTAGE V p-p
DIFFERENTIAL OUTPUT VOLTAGE V p-p
Figure 2. Output Voltage Swing vs. Supply Voltage
LOAD RESISTANCE (Differential ) (Single-Ended /2)
30
25
0
10
10k
100
1k
20
15
10
5
DIFFERENTIAL OUTPUT VOLTAGE Volts p-p
60
50
0
40
30
20
10
V
S
= 15V
V
S
= 5V
SINGLE-ENDED OUTPUT VOLTAGE Volts p-p
Figure 3. Output Voltage Swing vs. Load Resistance
AD815
REV. B
5
JUNCTION TEMPERATURE C
0
14
40
100
20
INPUT OFFSET VOLTAGE mV
0
20
40
60
80
2
6
8
10
12
4
V
S
= 5V
V
S
= 15V
Figure 7. Input Offset Voltage vs. Temperature
JUNCTION TEMPERATURE C
750
600
450
60
140
40
SHORT CIRCUIT CURRENT mA
20
0
20
40
60
80
100
120
700
650
550
500
V
S
= 15V
SINK
SOURCE
Figure 8. Short Circuit Current vs. Temperature
V
OUT
Volts
15
0
15
20
20
16
12
8
4
0
4
8
12
16
10
5
5
10
V
S
= 10V
V
S
= 5V
RTI OFFSET mV
V
S
= 15V
T
A
= 25 C
R
L
= 25
1k
1k
R
L
=
25
V
OUT
1/2
AD815
100
49.9
V
I N
f = 0.1Hz
Figure 9. Gain Nonlinearity vs. Output Voltage
LOAD CURRENT Amps
80
0
60
40
20
20
40
60
2.0
2.0
1.6
1.2
0.8
0.4
0
0.4
0.8
1.2
1.6
V
S
=
10V
V
S
=
5V
RTI OFFSET mV
V
S
=
15V
T
A
= 25 C
1k
1k
R
L
=
5
V
OUT
1/2
AD815
100
49.9
V
I N
f = 0.1Hz
Figure 10. Thermal Nonlinearity vs. Output Current Drive
FREQUENCY Hz
100
30k
300M
100k
CLOSED-LOOP OUTPUT RESISTANCE
1M
10M
100M
10
1
0.1
0.01
300k
3M
30M
V
S
= 5V
V
S
= 15V
Figure 11. Closed-Loop Output Resistance vs. Frequency
FREQUENCY MHz
40
0
0
14
6
DIFFERENTIAL OUTPUT VOLTAGE V p-p
10
30
20
10
R
L
= 50
R
L
= 25
R
L
= 1
2
4
8
12
R
L
= 100
T
A
= 25 C
V
S
= 15V
Figure 12. Large Signal Frequency Response
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