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OPA657U

1.6GHz, Low Noise, FET-Input Operational Amplifier

Manufacturer: Texas Instruments, Inc
Mfr.Part #: OPA657U
Datasheet: OPA657U Datasheet (PDF)
Package/Case: SOP8
Product Type: Amplifier ICs
RoHS:
Lifecycle: Active
EDA/CAD Models: Request Free CAD Models for OPA657U

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OPA657U General 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.

Key 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

Specifications

Category	Integrated Circuits (ICs)LinearAmplifiersInstrumentation, OP Amps, Buffer Amps	Mfr	Texas Instruments
Series	-	Package	Tube
Product Status	Active	Amplifier Type	Voltage Feedback
Number of Circuits	1	Output Type	-
Slew Rate	700V/µs	Gain Bandwidth Product	1.6 GHz
-3db Bandwidth	350 MHz	Current - Input Bias	2 pA
Voltage - Input Offset	250 µV	Current - Supply	14mA
Current - Output / Channel	70 mA	Voltage - Supply Span (Min)	8 V
Voltage - Supply Span (Max)	12 V	Operating Temperature	-40°C ~ 85°C
Mounting Type	Surface Mount	Package / Case	8-SOIC (0.154", 3.90mm Width)
Supplier Device Package	8-SOIC	Base Product Number	OPA657