OPA607 datasheet(22/45 Pages) TI

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9 Application and Implementation

Note

Information in the following applications sections is not part of the TI component specification, and TI

does not warrant its accuracy or completeness. TI’s customers are responsible for determining

suitability of components for their purposes, as well as validating and testing their design

implementation to confirm system functionality.

9.1 Application Information

The OPAx607 devices feature a 50-MHz GBW with 900 µA of supply current, providing good AC performance at

low-power consumption. The low input noise voltage of 3.8 nV/√ Hz, the approximate pA of bias current, and a

typical input offset voltage of 0.1 mV make the device very suitable for both AC and DC applications.

9.2 Typical Applications

9.2.1 100-kΩ Gain Transimpedance Design

The high GBW and low input voltage and current noise for the OPAx607 devices make it an excellent wideband

transimpedance amplifier for moderate to high transimpedance gains.

VOUT

+5 V

GND

100 k

OPAx607

Supply decoupling

not shown

3 pF

CDIFF

11.5 pF

CCM

5.5 pF

OPA607's input differential and

common-mode capacitance

+0.5 V

1.1 pF

IPD

VOUT = IPD X RF

Figure 9-1. Wideband, High-Sensitivity, Transimpedance Amplifier

9.2.1.1 Design Requirements

Design a high-bandwidth, high-transimpedance-gain amplifier with the design requirements shown in Table 9-1.

Table 9-1. Design Requirements

TARGET BANDWIDTH (MHz) TRANSIMPEDANCE-GAIN (kΩ)

PHOTODIODE CAPACITANCE

(pF)

100

OPA607, OPA2607

SBOS981I – OCTOBER 2019 – REVISED FEBRUARY 2021

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