Data Sheet

ADA4352-2

analog.com

Rev 0

32 of 47

Figure 71. Typical Gain Transimpedance Amplifier with Error due to RON

Figure 72. Switched Gain Transimpedance Amplifier with Kelvin Switching

Maximum Linear Input Current Range

Most photodiode PGTIA applications operate in a single supply configuration (see Figure 73). Even though ADA4352-

2 input pins can swing all the way to ground, the output stage requires at least 0.1 V from either of the supplies to

maintain specified linearity.

Figure 73. Maximum Linear Output Voltage

RF2

iin

IIN

RF3

VOUT = IIN × (RF0 + RON)

RF0

RF1

ADA4352-2

GAIN RESISTOR NETWORK

KELVIN

SWITCH

NETWORK

OUT

½

RF2 = 40.2kΩ

RF3 = 450kΩ

RF0 = 315Ω

RF1 = 3.5kΩ

IIN

SWITCH

RON

SWITCH

RON

1NO CURRENT THROUGH RIGHT SIDE SWITCH

1

ADA4352-2

GAIN RESISTOR NETWORK

KELVIN

SWITCH

NETWORK

OUT

–VB

IIN

VCM

½

PD

5V

VOUT = VCM + IIN × RF0

RF2 = 40.2kΩ

RF3 = 450kΩ

RF0 = 315Ω

RF1 = 3.5kΩ