ADCMP604 datasheet(18/34 Pages) AD

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LTC6563

Rev. 0

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BLOCK DIAGRAM

OMUX

OUT

TERM

PWRMD

OUTPUT

STAGE

TILT

ADJ0

ADJ1

BIAS

CTRL

LTC6563 BD

IN1

IN2

IN3

IN4

TIA

4:1

MUX

OFFSET

CHSEL0

CHSEL1

×2

×1

OUTPUT

CLAMPS

CM CONROL

LOOP

–

OPERATION

The LTC6563 is a four channel transimpedance ampli-

fier with an integrated 4-to-1 multiplexer and ADC driver

stage. Each of the transimpedance amplifiers converts

an input current to an output voltage. The integrated

4:1 multiplexer simplifies the system design while sav-

ing space and power. In addition, output multiplexing is

possible by using the OMUX pin. This allows multiple

4-channel LTC6563 devices to be combined. 8, 12, 16

… 32 input channels are easily multiplexed into a single

differential output.

The LTC6563 is optimized to drive high speed differential

input analog-to-digital converters (ADCs). OUT and OUT

have single-ended swings from as low as about 180mV

to about VCCO – 1V. The LTC6563 provides four modes of

output drive for matching input swing of high-speed ADCs.

The tilt feature allows the output stage to offset to take

advantage of the full differential input range of the ADCs.

The outputs have programmable clamps that limit the

output swing in saturation events. These clamps provide

protection to the front end of the ADC. The HI pin sets

the maximum swing, while a symmetric minimum swing

limit is set up internally.

In typical LIDAR applications, the LTC6563 amplifies the

output current of an APD. APD are biased near breakdown

to achieve high current gain. Under intense optical illumi-

nation, they can conduct large currents, often in excess

of 1A. The LTC6563 survives and quickly recovers from

large overload currents of this magnitude. During recover,

any TIA is blinded from subsequent pulses. The LTC6563

recovers from 1mA saturation events in less than 2.5ns

without phase reversal, minimizing this form of data loss.

Ambient light is problematic for LIDAR receiver chains.

The DC current can easily saturate the linear range of any

TIA. The LTC6563 provides a control for DC cancelation to

the inputs and can cancel up to 200μA of DC current. The

DC cancelation is designed to minimizing additive noise.

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