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

OPA657 (ACTIVE)

1.6GHz, Low Noise, FET-Input Operational Amplifier

 

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 (>=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    7    7    2.3    2.3   
12    13    13    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       
1600    500    500    650    6800    6800   
70    70    70    70    20    20   
74    75    71    79    94    94   
106    96    81    100    97    97   
5    10    5    10    10    10   

WEBENCH® Designer OPA657

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