OPA656 Datasheet, PDF (1/25 Pages) Texas Instruments – Wideband, Unity-Gain Stable, FET-Input OPERATIONAL AMPLIFIER

OPA656
OPA656
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SBOS196G – DECEMBER 2001 – REVISED NOVEMBER 2008
Wideband, Unity-Gain Stable, FET-Input
OPERATIONAL AMPLIFIER
FEATURES
q 500MHz UNITY-GAIN BANDWIDTH
q LOW INPUT BIAS CURRENT: 2pA
q LOW OFFSET AND DRIFT: ±0.25mV, ±2µV/°C
q LOW DISTORTION: 74dB SFDR at 5MHz
q HIGH OUTPUT CURRENT: 70mA
q LOW INPUT VOLTAGE NOISE: 7nV/√Hz
APPLICATIONS
q WIDEBAND PHOTODIODE AMPLIFIERS
q SAMPLE-AND-HOLD BUFFERS
q CCD OUTPUT BUFFERS
q ADC INPUT BUFFERS
q WIDEBAND PRECISION AMPLIFIERS
q TEST AND MEASUREMENT FRONT ENDS
1pF
499kΩ
499kΩ
DESCRIPTION
The OPA656 combines a very wideband, unity-gain stable,
voltage-feedback op amp with a FET-input stage to offer an
ultra high dynamic-range amplifier for ADC (Analog-to-Digital
Converter) buffering and transimpedance applications. Extremely
low DC errors give good precision in optical applications.
The high unity-gain stable bandwidth and JFET input allows
exceptional performance in high-speed, low-noise integrators.
The high input impedance and low bias current provided by
the FET input is supported by the ultra-low 7nV/√Hz input
voltage noise to achieve a very low integrated noise in
wideband photodiode transimpedance applications.
Broad transimpedance bandwidths are achievable given the
OPA656’s high 230MHz gain bandwidth product. As shown
below, a –3dB bandwidth of 1MHz is provided even for a high
1MΩ transimpedance gain from a 47pF source capacitance.
RELATED OPERATIONAL AMPLIFIER PRODUCTS
SLEW VOLTAGE
V_S BW RATE NOISE
DEVICE (V) (MHz) (V/µS) (nV/√HZ) AMPLIFIER DESCRIPTION
OPA355 +5 200 300
OPA655 ±5 400 290
OPA657 ±5 1600 700
OPA627 ±15 16 55
THS4601 ±15 180 100
5.8 Unity-Gain Stable CMOS
6
Unity-Gain Stable FET-Input
4.8 Gain of +7 Stable FET-Input
4.5 Unity-Gain Stable FET-Input
5.4 Unity-Gain Stable FET-Input
λ
OPA656
V_O
(47pF)
–V_b
Wideband Photodiode Transimpedance Amplifier
1MΩ TRANSIMPEDANCE BANDWIDTH
130
1MHz Bandwidth
120
110
100
90
80
10kHz
100kHz
Frequency
1MHz
5MHz
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PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
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