OPA656 Datasheet, PDF (1/33 Pages) Texas Instruments – Wideband, Unity-Gain Stable, FET-Input OPERATIONAL AMPLIFIER

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OPA656
SBOS196H – DECEMBER 2001 – REVISED SEPTEMBER 2015
OPA656 Wideband, Unity-Gain Stable, FET-Input Operational Amplifier
1 Features
•1 500 MHz Unity-gain Bandwidth
• Low Input Bias Current: 2 pA
• Low Offset And Drift: ±250 µV, ±2 μV/°C
• Low Distortion: 74-dB SFDR at 5 MHz
• High-Output Current: 70 mA
• Low Input Voltage Noise: 7 nV/√Hz
2 Applications
• Wideband Photodiode Amplifiers
• Sample-and-Hold Buffers
• CCD Output Buffers
• ADC Input Buffers
• Wideband Precision Amplifiers
• Test and Measurement Front Ends
3 Description
The OPA656 device combines a very wideband,
unity-gain stable, voltage-feedback operational
amplifier with a FET-input stage to offer an ultra high
dynamic-range amplifier for Analog-to-Digital
Converter (ADC) 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 7-nV/√Hz input voltage noise to achieve a very
low integrated noise in wideband photodiode
transimpedance applications.
Broad transimpedance bandwidths are achievable
given the OPA656 device’s high 230-MHz gain
bandwidth product. As shown below, a –3-dB
bandwidth of 1 MHz is provided even for a high 1-MΩ
transimpedance gain from a 47-pF source
capacitance.
1-MΩ Transimpedance Bandwidth
130
1MHz Bandwidth
120
Device Information⁽¹⁾
PART NUMBER
PACKAGE
BODY SIZE (NOM)
OPA656
SOIC (8)
SOT-23 (5)
2.90 mm × 1.60 mm
4.90 mm × 3.91 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
Wideband Photodiode Transimpedance Amplifier
1 pF
110
499 kΩ
499 kΩ
100
90
80
10kHz
100kHz
Frequency
1MHz
5MHz
λ
OPA656
V_O
(47 pF)
–V_b
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.