1
Rev. 0
DESCRIPTION
LTC6563
Four-Channel Differential-Output Transimpedance
Amplifier with Output Multiplexing
Demonstration circuit EVAL-LTC6563-TQFN features
the
four-channel transimpedance amplifier
(TIA) with output multiplexing. This demo kit, EVAL-
LTC6563TQFN-EZKIT shipped along with the SDP-K1
controller board, has 4 installed single APD’s which allows
optical testing of the TIA functionality. Electrical testing
using an external lab pulse generator, as the input current
pulse, is also possible with small board modifications.
With its 20kΩ transimpedance gain and 90µA linear input
current range, the LTC6563 is ideal for LIDAR receivers
using Avalanche Photodiodes (APD). The LTC6563 oper-
ates from 3.3V single supply and consumes only 194mW
(depending on output mode) for 4 channels. Utilizing the
LTC6563’s output MUX, multiple LTC6563 devices can
be combined to a single output. The LTC6563’s fast over-
load recovery makes it well-suited for LIDAR receivers.
The LTC6563’s differential output can swing 2V
P-P
into
a 100Ω load, ideal for driving a high-speed ADC directly.
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The LTC6563 is packaged in a compact 3mm × 5mm
24-pin leadless QFN package with an exposed pad for
thermal management and low inductance.
The EVAL-LTC6563-TQFN utilizes four installed 400-
1100nm APD sensors feeding the LTC6563 for current-
to-voltage conversion and amplification. The APDs are
DC-coupled to the TIAs to facilitate fast output multi-
plexing and channel switching. Alternatively, with small
board modifications, it is possible to electrically excite the
LTC6563 using a lab generator tied to SMA connectors
provided on the board and voltage-to-current resistors on
the board. The EVAL-LTC6563-TQFN is intended to dem-
onstrate time-domain measurements into 50Ω systems.
NOTE: This document applies to EVAL/Demo boards
which have Rev. A3 label attached to the bottom side.
Design files for this circuit board are available
Figure 1. Connection Diagram (IN1 to IN4 Optional for Electrical Testing Only)
