Quick Test Set Up; Quick Test Procedure; Testing The Vina To Vouta Signal Path.; Testing The Vinb To Voutb Signal Path. - Linear Technology DC1418A-A Quick Start Manual

DEMO CIRCUIT 1418 QUICK START GUIDE

QUICK TEST SET UP

Signal Generator
with 50 Ohm Output
50 Ohm
Terminator

Quick Test Procedure

A DC1418 has two pairs of differential inputs,
Vin+A/Vin-A and Vin+B/Vin-B and two pairs of differen-
tial outputs Vout-A /Vout+A and Vout-B/Vout-B.

1. Testing the VinA to VoutA Signal Path.

Connect a DC1418 board as shown in Figure 2 (connect
signal generator to Vin+A and terminate Vin-A with a 50
ohm terminator). Set the generator for a 1MHz, 2Vp-p,
and sinewave. The oscilloscope channels connected to
Vout-A and Vout+A show a 1MHz, 1Vp-p, sinewave (see
Note 1).
Dual Power Supply
Figure 2. Dual Supply Test Set Up Connections
(set the JP1 shunt to VMIDA and the JP2 shunt to DUAL).
Oscilloscope (≥100MHz)

2. Testing the VinB to VoutB Signal Path.

Connect signal generator to Vin+B and terminate Vin-B
with a 50 ohm terminator. Set the generator for a 1MHz,
2Vp-p, and sinewave. Connect oscilloscope channel 1 to
Vout-B and channel 2 to Vout+B. The oscilloscope
channels connected to Vout-B and Vout+B show a
1MHz, 1Vp-p, sinewave.
Note 1: For unity gain testing the DC1418 inputs must
be ideally driven by a zero ohm source (the outputs of a
high speed differential amplifier). However with the 50
ohm impedance of the generator's output and termina-
tor is in series with the input resistors and the input to
output gain is less than one.
Note 2: For single supply testing set the JP2 shunt to
SINGLE.
LTC6604-X
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