LT6230CS6 datasheet(24/24 Pages) LINER

24 / 24 page

LT6230/LT6230-10/

LT6231/LT6232

sn623012 623012fas

Linear Technology Corporation

1630 McCarthy Blvd., Milpitas, CA 95035-7417

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

©LINEAR TECHNOLOGY CORPORATION 2003

LT/TP 0304 1K REV A • PRINTED IN USA

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Photodiode Amplifier Time Domain Response

Low Power Avalanche Photodiode Transimpedance Amplifier

IS = 3.3mA

50ns/DIV

623012 TA02b

–

1.5k

0.1

µF

–5V

ENABLE

LT6230

≈ 200V BIAS

ADVANCED PHOTONIX

012-70-62-541

WWW.ADVANCEDPHOTONIX.COM

623012 TA02a

4.7pF

OUTPUT OFFSET = 500

µV TYPICAL

BANDWIDTH = 20MHz

OUTPUT NOISE = 1.1mVP–P (100MHz MEASUREMENT BW)

TYPICAL APPLICATIO S

The LT6230 is applied as a transimpedance amplifier with

an I-to-V conversion gain of 1.5k

Ω set by R1. The LT6230

is ideally suited to this application because of its low input

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

cause the 1.5k resistor has an inherent thermal noise of

5nV/

√Hz or 3.4pA/√Hz at room temperature, while the

LT6230 contributes only 1.1nV and 2.4pA /

√Hz. So, with

respect to both voltage and current noises, the LT6230 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 • 1.5k. C1 ensures stability and good

settling characteristics. Output offset was measured

at 280

µV, so low in part because R2 serves to cancel the

DC effects of bias current. Output noise was measured at

1.1mVP–P on a 100MHz measurement bandwidth, with C2

shunting R2’s thermal noise. As shown in the scope

photo, the rise time is 17ns, indicating a signal bandwidth

of 20MHz.

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