OPA657 1.6GHz, Low Noise, FET-Input Operational Amplifier | TI.com

OPA657 (ACTIVE)

1.6GHz, Low Noise, FET-Input Operational Amplifier

1.6GHz, Low Noise, FET-Input Operational Amplifier - OPA657
 

Description

The OPA657 device combines a high-gain bandwidth, low-distortion, voltage-feedback operational amplifier with a low-voltage noise JFET-input stage to offer a very high dynamic range amplifier for high-precision ADC (analog-to-digital converter) driving or wideband transimpedance applications. Photodiode applications see improved noise and bandwidth using this decompensated, high-gain bandwidth amplifier.

Very low level signals can be significantly amplified in a single OPA657 gain stage with exceptional bandwidth and accuracy. Having a high 1.6-GHz gain bandwidth product gives greater than 10-MHz signal bandwidths up to gains of 160 V/V (44 dB). The very low input bias current and capacitance supports this performance even for relatively high source impedances.

Broadband photodetector applications benefit from the low-voltage noise JFET inputs for the OPA657. The JFET input contributes virtually no current noise while for broadband applications, a low voltage noise is also required. The low 4.8 nV/√Hz input voltage noise provides exceptional input sensitivity for higher bandwidth applications. The example shown below gives a total equivalent input noise current of 1.8 pA/√Hz over a 10-MHz bandwidth.

Features

  • High Gain Bandwidth Product: 1.6 GHz
  • High Bandwidth 275 MHz (G = 10)
  • Slew Rate 700 V/µs (G = 10, 1-V Step)
  • Available in High Grade With Improved DC
    Specifications
  • Operating Temperature Range: –40°C to 85°C
  • Low-Input Offset Voltage: ±250 µV
  • Low-Input Bias Current: 2 pA
  • Low-Input Voltage Noise: 4.8 nV/√Hz
  • High-Output Current: 70 mA
  • Fast Overdrive Recovery

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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 1kHz (Typ) (nV/rtHz)
Iq per channel (Typ) (mA)
Vos (Offset Voltage @ 25C) (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
OPA657 OPA653 OPA656 OPA659 OPA857 OPA857-DIE
FET
Voltage FB    
FET     FET
Voltage FB    
FET
Voltage FB    
FET
Voltage FB    
FET
Voltage FB    
1     1     1     1     1     1    
8     7     8     7     2.3     2.3    
12     13     12     13     3.6     3.6    
350     500     500     650     130     130    
7     2     1     2        
700     2675     290     2550     220     220    
4.8     6.1     7     8.9     4.5      
7     6.1     10     8.9     7      
14     32     14     30.5     23.4     23.4    
1.8     5     0.6     5     10      
No     No     No     No     No     No    
Decompensated     Decompensated     N/A     N/A     N/A     N/A    
Catalog     Catalog     Catalog     Catalog     Catalog     Catalog    
-40 to 85     -40 to 85     -40 to 85     -40 to 85     -40 to 95     -40 to 85    
SOIC
SOT-23    
SON
SOT-23    
SOIC
SOT-23    
SON
SOT-23    
VQFN      
8SOIC: 29 mm2: 6 x 4.9(SOIC)
5SOT-23: 8 mm2: 2.8 x 2.9(SOT-23)    
See datasheet (SON)
5SOT-23: 8 mm2: 2.8 x 2.9(SOT-23)    
8SOIC: 29 mm2: 6 x 4.9(SOIC)
5SOT-23: 8 mm2: 2.8 x 2.9(SOT-23)    
See datasheet (SON)
5SOT-23: 8 mm2: 2.8 x 2.9(SOT-23)    
16VQFN: 9 mm2: 3 x 3(VQFN)      
89     66     86     70        
20     50     5     50     20     20    
2     10     2     10