TSH350
550MHz low noise current feedback amplifier
Features
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Bandwidth: 550MHz in unity gain
Quiescent current: 4.1mA
Slew rate: 940V/μs
Input noise: 1.5nV/√Hz
Distortion: SFDR=-66dBc (10MHz, 1V
pp
)
2.8V
pp
minimum output swing on 100Ω load for
a 5V supply
Tested on 5V power supply
SOT23-5
Applications
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Communication & video test equipment
Medical instrumentation
ADC drivers
Description
b
O
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/µs and an output stage
optimized for driving a standard 100Ω load, this
circuit is highly suitable for applications where
speed and power-saving are the main
requirements.
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Pin connections
(top view)
Output 1
VCC - 2
5 VCC +
+-
4 Inv. In.
SOT23-5
Non-Inv. In. 3
NC 1
Inv. In. 2
Non-Inv. In. 3
VCC - 4
SO-8
8 NC
_
+
7 VCC +
6 Output
5 NC
The TSH350 is a single operator available in the
tiny SOT23-5 and SO-8 plastic packages, saving
board space as well as providing excellent
thermal and dynamic performance.
June 2007
Rev 4
1/22
www.st.com
22
Absolute maximum ratings
TSH350
1
Absolute maximum ratings
Table 1.
Symbol
V
CC
V
id
V
in
T
stg
T
j
R
thja
Supply voltage
(1)
Differential input voltage
(2)
Input voltage range
(3)
Storage temperature
Maximum junction temperature
Thermal resistance junction to ambient
SOT23-5
SO-8
Thermal resistance junction to case
SOT23-5
SO-8
Absolute maximum ratings (AMR)
Parameter
Value
6
+/-0.5
+/-2.5
-65 to +150
150
Unit
V
V
V
°C
R
thjc
P
max
Maximum power dissipation
(4)
(@T
amb
=25°C) for T
j
=150°C
SOT23-5
SO-8
HBM: human body model
(5)
pins 1, 4, 5, 6, 7 and 8
pins 2 and 3
ESD
MM: machine model
(6)
pins 1, 4, 5, 6, 7 and 8
pins 2 and 3
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1. All voltage values are measured with respect to the ground pin.
2. Differential voltage is the non-inverting input terminal with respect to the inverting input terminal.
3. The magnitude of input and output voltage must never exceed V
CC
+0.3V.
4. Short-circuits can cause excessive heating. Destructive dissipation can result from short-circuits on all
amplifiers.
5. Human body model: A 100pF capacitor is charged to the specified voltage, then discharged through a
1.5kΩ resistor between two pins of the device. This is done for all couples of connected pin combinations
while the other pins are floating.
6. Machine model: A 200pF capacitor is charged to the specified voltage, then discharged directly between
two pins of the device with no external series resistor (internal resistor < 5Ω). This is done for all couples of
connected pin combinations while the other pins are floating.
7. Charged device model: all pins and the package are charged together to the specified voltage and then
discharged directly to the ground through only one pin. This is done for all pins.
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CDM: charged device model
(7)
pins 1, 4, 5, 6, 7 and 8
pins 2 and 3
Latch-up immunity
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250
150
80
28
500
830
2
0.5
200
60
1.5
1.5
200
s)
t(
°C
°C/W
°C/W
mW
kV
V
kV
mA
2/22
TSH350
Table 2.
Symbol
V
CC
V
icm
T
oper
Supply voltage
(1)
Common mode input voltage
Operating free air temperature range
Absolute maximum ratings
Operating conditions
Parameter
Value
4.5 to 5.5
-V
CC
+1.5V to +V
CC
-1.5V
-40 to + 85
Unit
V
V
°C
1. Tested in full production at 5V (±2.5V) supply voltage.
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3/22
Electrical characteristics
TSH350
2
Table 3.
Symbol
Electrical characteristics
Electrical characteristics for V
CC
= ±2.5V, T
amb
= 25°C (unless otherwise specified)
Parameter
Test conditions
Min.
Typ.
Max.
Unit
DC performance
V
io
ΔV
io
I
ib+
Input offset voltage
Offset voltage between both inputs
V
io
drift vs. temperature
Non inverting input bias current
DC current necessary to bias the input +
Inverting input bias current
DC current necessary to bias the input -
Common mode rejection ratio
20 log
(
Δ
V
ic
/
Δ
V
io
)
Supply voltage rejection ratio
20 log
(
Δ
V
CC
/
Δ
V
io
)
Power supply rejection ratio
20 log
(
Δ
V
CC
/
Δ
V
out)
T
amb
T
min
< T
amb
< T
max
T
min
< T
amb
< T
max
T
amb
T
min
< T
amb
< T
max
T
amb
T
min
< T
amb
< T
max
ΔV
ic
= ±1V
T
min
< T
amb
< T
max
ΔV
CC
=+3.5V to +5V
T
min
< T
amb
< T
max
0.8
1
0.9
12
13
1
35
μV/°C
4
mV
I
ib-
CMR
SVR
PSR
I
CC
Positive supply current
DC consumption with no input signal
Dynamic performance and output characteristics
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
)
R
OL
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A
V
= +1,
ΔV
CC
=±100mV
at 1kHz
T
min
< T
amb
< T
max
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P
56
68
d
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2.5
60
uc
20
s)
t(
μA
μA
dB
58
81
dB
78
51
dB
48
4.1
4.9
mA
No load
ΔV
out
= ±1V, R
L
= 100Ω
T
min
< T
amb
< T
max
Small signal
V
out
=20mV
pp
A
V
= +1, R
L
= 100Ω
A
V
= +2, R
L
= 100Ω
A
V
= +10, R
L
= 100Ω
A
V
= -2, R
L
= 100Ω
Small signal
V
out
=100mV
p
A
V
= +1, R
L
= 100Ω
V
out
= 2V
pp
, A
V
= +2,
R
L
= 100Ω
R
L
= 100Ω
T
min
< T
amb
< T
max
170
270
kΩ
250
kΩ
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
Gain flatness @ 0.1dB
Band of frequency where the gain variation
does not exceed 0.1dB
250
550
390
125
370
MHz
65
SR
Slew rate
Maximum output speed of sweep in large
signal
High level output voltage
940
1.44
1.56
1.49
V/μs
V
V
OH
4/22
TSH350
Table 3.
Symbol
V
OL
Electrical characteristics
Electrical characteristics for V
CC
= ±2.5V, T
amb
= 25°C (unless otherwise specified)
Parameter
Low level output voltage
Test conditions
R
L
= 100Ω
T
min
< T
amb
< T
max
Output to GND
I
sink
Short-circuit output current coming in the op-
T
min
< T
amb
< T
max
amp (see
Figure 9)
135
Min.
Typ.
Max.
Unit
V
-1.53 -1.44
-1.49
205
195
I
out
mA
I
source
Output current coming out from the op-amp
(see
Figure 10)
Output to GND
T
min
< T
amb
< T
max
-140
-210
-185
Noise and distortion
eN
Equivalent input noise voltage
See
Section 5: Noise measurements
Equivalent input noise current (+)
See
Section 5: Noise measurements
iN
Equivalent input noise current (-)
See
Section 5: Noise measurements
F = 100kHz
F = 100kHz
F = 100kHz
SFDR
A
V
= +1, V
out
= 1V
pp
Spurious free dynamic range
F = 10MHz
The highest harmonic of the output spectrum F = 20MHz
F = 50MHz
when injecting a filtered sine wave
F = 100MHz
Table 4.
Closed-loop gain and feedback components
Gain
V
CC
(V)
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+2
-2
+1
-1
+10
-10
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(s
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1.5
20
13
-66
-57
-46
-42
s)
t(
nV/√Hz
pA/√Hz
pA/√Hz
dBc
R
fb
(Ω)
300
300
300
300
820
300
-3dB Bw (MHz)
125
120
390
370
550
350
0.1dB Bw (MHz)
22
20
110
70
65
120
5/22
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