ADA4620-2ARZ-R7 datasheet(38/49 Pages) AD

Il numero della parte	ADA4620-2ARZ-R7

Spiegazioni elettronici	36 V, Precision, Low Noise, 16.5 MHz JFET Op Amp with Rail-to-Rail Output

PDF	49 Pages

Scroll/Zoom	100%

Produttore elettronici	AD [Analog Devices]

Homepage	http://www.analog.com

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38 / 49 page

Data Sheet

ADA4620-1, ADA4620-2

analog.com

Rev. 0

38 of 49

Figure 119 shows the ADA4620-1/ADA4620-2 configured as a transimpedance photodiode amplifier. The amplifiers

are used in conjunction with a photodiode detector with a shunt capacitance of 3 pF at 5 V of reverse bias (Osram

SFH213).

Figure 119. Transimpedance Photodiode Preamplifier

Figure 120 shows the transimpedance response of the ADA4620 when IPHOTO is 1 µA p-p. The amplifiers have a

bandwidth of 2 MHz with no compensation but a lot of peaking. Adding CF of 1.5 pF completely eliminates the

peaking, and also reduces the bandwidth to 1.1 MHz. See Figure 121.

Figure 120. Initial Photodiode Amplifier Response with Peaking (Undercompensated)

Figure 121. Photodiode Amplifier Response with CF= 1.5 pF (Slightly Overcompensated)

0.1µF

+15V TO +27V

–5V

100kΩ

VOUT

1pF

ADA4620-1/

ADA4620-2

0.1µF

–5V

SFH213

FREQUENCY (Hz)

10k

100k

10M

FREQUENCY (Hz)

10k

100k

10M

ADA4620-2ARZ-R7 Scheda tecnica(PDF) 38 Page - Analog Devices