OPA656 Wideband, Unity Gain Stable FET-Input Operational Amplifier | TI.com

OPA656 (ACTIVE)

Wideband, Unity Gain Stable FET-Input Operational Amplifier

 

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.

Features

  • 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

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Parametrics Compare all products in High-speed op amps (GBW>=50MHz)

 
Architecture
Number of channels (#)
Total Supply Voltage (Min) (+5V=5, +/-5V=10)
Total Supply Voltage (Max) (+5V=5, +/-5V=10)
BW @ Acl (MHz)
Acl, min spec gain (V/V)
Slew Rate (Typ) (V/us)
Vn at flatband (Typ) (nV/rtHz)
Vn at 1 kHz (Typ) (nV/rtHz)
Iq per channel (Typ) (mA)
Vos (offset voltage @ 25 C) (Max) (mV)
Rail-to-rail
Features
Rating
Operating temperature range (C)
Package Group
Package size: mm2:W x L (PKG)
CMRR (Typ) (dB)
Input bias current (Max) (pA)
Offset drift (Typ) (uV/C)
GBW (Typ) (MHz)
Output current (Typ) (mA)
2nd harmonic (dBc)
3rd harmonic (dBc)
@ MHz
OPA656
FET
Voltage FB    
1    
8    
12    
500    
1    
290    
7    
10    
14    
0.6    
No    
   
Catalog    
-40 to 85    
SOIC | 8
SOT-23 | 5    
8SOIC: 29 mm2: 6 x 4.9 (SOIC | 8)
5SOT-23: 8 mm2: 2.8 x 2.9 (SOT-23 | 5)    
86    
5    
2    
500    
70    
71    
81    
5    

Design tool

WEBENCH® Designer OPA656

Amplifier Topology
 Non-inverting
 Inverting
Desired Power Supply Voltage
Positive Supply (Vcc):  V
Negative Supply (Vee):  V
Allowed Power Supply(Vcc-Vee) = 7.0 to 13.0 V
Desired Input and Output Requirements
  Min Max
Vin  V  V
Vout  V  V
Minimum Temperature = -40.0 °C
Maximum Temperature = 85.0 °C