LT6235IGN datasheet(24/24 Pages) LINER

24 / 24 page

LT6233/LT6233-10/

LT6234/LT6235

623345f

Linear Technology Corporation

1630 McCarthy Blvd., Milpitas, CA 95035-7417

(408) 432-1900 q FAX: (408) 434-0507 q www.linear.com

LT/TP 1003 1K • PRINTED IN USA

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Photodiode Amplifier Time Domain Response

Low Power Avalanche Photodiode Transimpedance Amplifier

IS = 1.2mA

100ns/DIV

623345 TA02b

–

10k

0.1

µF

–5V

ENABLE

LT6233

≈ 200V BIAS

ADVANCED PHOTONIX

012-70-62-541

WWW.ADVANCEDPHOTONIX.COM

OUTPUT OFFSET = 500

µV TYPICAL

BANDWIDTH = 7.8MHz

OUTPUT NOISE = 1mVP–P (20MHz MEASUREMENT BW)

623345 TA02a

2.7pF

TYPICAL APPLICATIO S

The LT6233 is applied as a transimpedance amplifier with

an I-to-V conversion gain of 10k

Ω set by R1. The LT6233

is ideally suited to this application because of its low input

offset voltage and current, and its low noise. This is be-

cause the 10k resistor has an inherent thermal noise of

13nV/

√Hz or 1.3pA/√Hz at room temperature, while the

LT6233 contributes only 2nV and 0.8pA /

√Hz. So, with

respect to both voltage and current noises, the LT6233 is

actually quieter than the gain resistor.

The circuit uses an avalanche photodiode with the cathode

biased to approximately 200V. When light is incident on

the photodiode, it induces a current IPD which flows into

the amplifier circuit. The amplifier output falls negative to

maintain balance at its inputs. The transfer function is

therefore VOUT = –IPD • 10k. C1 ensures stability and good

settling characteristics. Output offset was measured

at better than 500

µV, so low in part because R2 serves to

cancel the DC effects of bias current. Output noise was

measured at below 1mVP–P on a 20MHz measurement

bandwidth, with C2 shunting R2’s thermal noise. As shown

in the scope photo, the rise time is 45ns, indicating a signal

bandwidth of 7.8MHz.

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