December 2004
Revision 2
1/21
Bandwidth: 550MHz in unity gain
Quiescent current: 4.1mA
Slew rate: 940V/
s
Input noise: 1.5nV/VHz
Distortion: SFDR=-66dBc (10MHz, 1Vp-p)
2.8Vp-p min. output swing on 100
load for
a 5V supply
Tested on 5V power supply
Description
The TSH350 is a current feedback operational
amplifier using a very high speed complementary
technology to provide a bandwidth up to 410MHz
while drawing only 4.1mA of quiescent current.
With a slew rate of 940V/s and an output stage
optimized for driving a standard 100
load, this
circuit is highly suitable for applications where
speed and power-saving are the main
requirements.
The TSH350 is a single operator available in the
tiny SOT23-5 and SO8 plastic packages, saving
board space as well as providing excellent
thermal and dynamic performances.
Applications
Communication & Video Test Equipment
Medical Instrumentation
ADC drivers
Pin Connections
(top view)
Order Codes
1
2
3
5
4
-VCC
+VCC
+ -
OUT
-IN
+IN
SOT23-5
+VCC
1
2
3
5
4
8
7
6
NC
OUT
+
_
-VCC
NC
-IN
+IN
SO8
NC
1
2
3
5
4
-VCC
+VCC
+ -
OUT
-IN
+IN
SOT23-5
+VCC
1
2
3
5
4
8
7
6
NC
OUT
+
_
-VCC
NC
-IN
+IN
SO8
NC
Part Number
Temperature Range
Package
Conditioning
Marking
TSH350ILT
-40C
to
+85C
SOT23-5
Tape&Reel
K305
TSH350ID
SO8
Tube
TSH350I
TSH350IDT
SO8
Tape&Reel
TSH350I
TSH350
550 MHz, Low Noise Current Feedback Amplifier
TSH350
Absolute Maximum Ratings
2/21
1 Absolute
Maximum
Ratings
Table 1: Key parameters and their absolute maximum ratings
Symbol
Parameter
Value
Unit
V
CC
Supply Voltage
1
1) All voltages values are measured with respect to the ground pin.
6
V
V
id
Differential Input Voltage
2
2) Differential voltage are non-inverting input terminal with respect to the inverting input terminal.
+/-0.5
V
V
in
Input Voltage Range
3
3) The magnitude of input and output voltage must never exceed V
CC
+0.3V.
+/-2.5
V
T
oper
Operating Free Air Temperature Range
-40 to + 85
C
T
stg
Storage Temperature
-65 to +150
C
T
j
Maximum Junction Temperature
150
C
R
thja
Thermal Resistance Junction to Ambient
SOT23-5
SO8
250
150
C/W
R
thjc
Thermal Resistance Junction to Ambient
SOT23-5
SO8
80
28
C/W
P
max
Maximum Power Dissipation
4
(@Ta=25C) for Tj=150C
SOT23-5
SO8
4) Short-circuits can cause excessive heating. Destructive dissipation can result from short circuit on amplifiers.
500
830
mW
ESD
HBM : Human Body Model
5
(pins 1, 4, 5, 6, 7 and 8)
5) Human body model, 100pF discharged through a 1.5k
resistor into pMin of device.
2
kV
HBM : Human Body Model (pins 2 and 3)
0.5
kV
MM : Machine Model
6
(pins 1, 4, 5, 6, 7 and 8)
6) This is a minimum Value. Machine model ESD, a 200pF cap is charged to the specified voltage, then discharged directly into the IC with
no external series resistor (internal resistor < 5
), into pin to pin of device.
200
V
MM : Machine Model (pins 2 and 3)
60
V
CDM : Charged Device Model (pins 1, 4, 5, 6, 7 and 8)
1.5
kV
CDM : Charged Device Model (pins 2 and 3)
1.5
kV
Latch-up Immunity
200
mA
Table 2: Operating conditions
Symbol
Parameter
Value
Unit
V
CC
Supply Voltage
1
1) Tested in full production at 5V (2.5V) supply voltage.
4.5 to 5.5
V
V
icm
Common Mode Input Voltage
-Vcc+1.5V to +Vcc-1.5V
V
Electrical Characteristics
TSH350
3/21
2 Electrical
Characteristics
Table 3: Electrical characteristics for V
CC
= 2.5Volts, T
amb
= 25C (unless otherwise specified)
Symbol
Parameter
Test Condition
Min.
Typ.
Max.
Unit
DC performance
V
io
Input Offset Voltage
Offset Voltage between both inputs
T
amb
0.8
4
mV
T
min.
< T
amb
< T
max.
1
V
io
V
io
drift vs. Temperature
T
min.
< T
amb
< T
max.
0.9
V/C
I
ib+
Non Inverting Input Bias Current
DC current necessary to bias the input +
T
amb
12
35
A
T
min.
< T
amb
< T
max.
13
I
ib-
Inverting Input Bias Current
DC current necessary to bias the input -
T
amb
1
20
A
T
min.
< T
amb
< T
max.
2.5
CMR
Common Mode Rejection Ratio
20 log (
V
ic
/
V
io
)
V
ic
= 1V
56
60
dB
T
min.
< T
amb
< T
max.
58
SVR
Supply Voltage Rejection Ratio
20 log (
V
cc
/
V
io
)
V
cc
=+3.5V to +5V
68
81
dB
T
min.
< T
amb
< T
max.
78
PSR
Power Supply Rejection Ratio
20 log (
V
cc
/
V
out
)
A
V
= +1,
V
cc
=100mV
at 1kHz
51
dB
T
min.
< T
amb
< T
max.
48
I
CC
Positive Supply Current
DC consumption with no input signal
No load
4.1
4.9
mA
Dynamic performance and output characteristics
R
OL
Transimpedance
Output Voltage/Input Current Gain in
open loop of a CFA.
For a VFA, the analog of this feature is
the Open Loop Gain (A
VD
)
V
out
= 1V, R
L
= 100
170
270
k
T
min.
< T
amb
< T
max.
250
k
Bw
-3dB Bandwidth
Frequency where the gain is 3dB below
the DC gain A
V
Note:
Gain Bandwidth Product criterion is
not applicable for Current-Feedback-
Amplifiers
Small Signal V
out
=20mVp-p
A
V
= +1, R
L
= 100
A
V
= +2, R
L
= 100
A
V
= +10, R
L
= 100
A
V
= -2, R
L
= 100
250
550
390
125
370
MHz
Gain Flatness @ 0.1dB
Band of frequency where the gain varia-
tion does not exceed 0.1dB
Small Signal V
out
=100mVp
A
V
= +1, R
L
= 100
65
SR
Slew Rate
Maximum output speed of sweep in
large signal
V
out
= 2Vp-p, A
V
= +2,
R
L
= 100
940
V/
s
V
OH
High Level Output Voltage
R
L
= 100
1.44
1.56
V
T
min.
< T
amb
< T
max.
1.49
V
OL
Low Level Output Voltage
R
L
= 100
-1.53
-1.44
V
T
min.
< T
amb
< T
max.
-1.49
TSH350
Electrical Characteristics
4/21
I
out
Isink
Short-circuit Output current coming in
the op-amp.
See fig-8 for more details
Output to GND
135
205
mA
T
min.
< T
amb
< T
max.
195
Isource
Output current coming out from the op-
amp.
See fig-11 for more details
Output to GND
-140
-210
T
min.
< T
amb
< T
max.
-185
Noise and distortion
eN
Equivalent Input Noise Voltage
see application note on page 13
F = 100kHz
1.5
nV/
Hz
iN
Equivalent Input Noise Current (+)
see application note on page 13
F = 100kHz
20
pA/
Hz
Equivalent Input Noise Current (-)
see application note on page 13
F = 100kHz
13
pA/
Hz
SFDR
Spurious Free Dynamic Range
The highest harmonic of the output
spectrum when injecting a filtered sine
wave
A
V
= +1, V
out
= 1Vp-p
F = 10MHz
F = 20MHz
F = 50MHz
F = 100MHz
-66
-57
-46
-42
dBc
Table 4: Closed-loop gain and feedback components
V
CC
(V)
Gain
R
fb
(
)
-3dB Bw (MHz)
0.1dB Bw (MHz)
2.5
+10
300
125
22
-10
300
120
20
+2
300
390
110
-2
300
370
70
+1
820
550
65
-1
300
350
120
Table 3: Electrical characteristics for V
CC
= 2.5Volts, T
amb
= 25C (unless otherwise specified)
Symbol
Parameter
Test Condition
Min.
Typ.
Max.
Unit
Electrical Characteristics
TSH350
5/21
Figure 1: Frequency response, positive gain
Figure 2: Compensation, gain=+4
Figure 3: Frequency response vs. capa-load
1M
10M
100M
1G
-10
-8
-6
-4
-2
0
2
4
6
8
10
12
14
16
18
20
22
24
Gain=+1
Gain=+2
Gain=+4
Small Signal
Vcc=5V
Load=100
Gain=+10
G
a
in
(
d
B
)
Frequency (Hz)
1M
10M
100M
11,6
11,7
11,8
11,9
12,0
12,1
+
-
100R
300R
4pF
Vin
Vout
Gain=+4, Vcc=5V,
Small Signal
+
-
100R
300R
4pF
Vin
Vout
Gain=+4, Vcc=5V,
Small Signal
G
a
in
F
l
at
n
ess
(
d
B
)
Frequency (Hz)
1M
10M
100M
1G
-10
-8
-6
-4
-2
0
2
4
6
8
10
+
-
300R
300R
Vin
Vout
Gain=+2, Vcc=5V,
Small Signal
R-iso
1k
C-Load
+
-
300R
300R
Vin
Vout
Gain=+2, Vcc=5V,
Small Signal
R-iso
1k
C-Load
C-Load=10pF
R-iso=39ohms
C-Load=22pF
R-iso=27ohms
C-Load=1pF
R-iso=22ohms
G
a
in
(
d
B)
Frequency (Hz)
Figure 4: Frequency response, negative gain
Figure 5: Compensation, gain=+2
Figure 6: Step response vs. capa-load
1M
10M
100M
1G
-10
-8
-6
-4
-2
0
2
4
6
8
10
12
14
16
18
20
22
24
Gain=-1
Gain=-2
Gain=-4
Small Signal
Vcc=5V
Load=100
Gain=-10
G
a
in
(
d
B
)
Frequency (Hz)
1M
10M
100M
1G
5,6
5,7
5,8
5,9
6,0
6,1
6,2
Gain=+2, Vcc=5V,
Small Signal
+
-
100R
300R
2pF
Vin
Vout
8k2
Gain=+2, Vcc=5V,
Small Signal
+
-
100R
300R
2pF
Vin
Vout
8k2
G
a
in
F
l
at
n
ess
(
d
B
)
Frequency (Hz)
0,0s
2,0ns 4,0ns 6,0ns 8,0ns 10,0ns 12,0ns 14,0ns 16,0ns 18,0ns 20,0ns
-1
0
1
2
3
+
-
300R
300R
Vin
Vout
Gain=+2, Vcc=5V,
Small Signal
R-iso
1k
C-Load
+
-
300R
300R
Vin
Vout
Gain=+2, Vcc=5V,
Small Signal
R-iso
1k
C-Load
C-Load=10pF
R-iso=39ohms
C-Load=22pF
R-iso=27ohms
C-Load=1pF
R-iso=22ohms
Ou
tpu
t
s
t
e
p
(V
ol
t)
Time (ns)
PDF 
ZIP