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CDB5504 CAPTURE INTERFACE

By John Lis INTRODUCTION

Application Note
CDB5504 CAPTURE INTERFACE
By John Lis INTRODUCTION
REMOVE R25 JUMPER U1-6 to U1-18 ISOLATE U3-3 ISOLATE U3-8
Cirrus Logic, Inc. Crystal Semiconductor Products Division P.O. Box 17847, Austin, Texas 78760 (512) 445 7222 FAX: (512) 445 7581 http://www.crystal.com
MODIFICATIONS TO THE CDB5504 FOR INTERFACING TO CDBCAPTURE
+5 CAL R22 10 R9 +5 +5 AGND DGND R27 1K R26 1K C19 10nF C20 10nF C7 0.1 µF 14 VA+ 10 17 VD+ CAL 4 C17 TP10 12 13 3 VREF+ VREFCONV TP9 CS 2 TP8 6 TP7 10 TP11 11 TP12 R23 100k R24 100k U2E 12 SDATA 14 U2F 8 15 SCLKO U2D 9 U2C 7 0.1 µF 1 2 4 U2B 5 VD+ R18 A0 R19 100k 47k VD+ R20 100k U2A 3 47k CS VD+ R17 VD+ CONV VD+ C10 0.1 µF + C16 10 µF +5 +5 DRDY SCLK C11 0.01 µF R10 20k R11 100k J2 CAL SDATA
1A -5 1B 6 R8 C8 25k 0.1 µF 2A 2B 3A 3B
LT1019 -2.5 V 5
U1 CS5504
DRDY TP3 11 TP4 9 AIN2+ TP5 10 TP6 8 AIN1+ AIN1AIN2SDATA 18 20
C12 0.01 µF
C13 0.01 µF
0.01 µF 0.01 µF R3 50 VA- XIN 15 5
5 U3B 6 0.1 µF VD+ R25 4 100k VD+ 14 2 C18 U3A R1 3 R16 100k TP14 1 100k 7 12 11 BP / UP U3D 13 7 VD+ R21 U3C 47k 8 9 10 SCLK XOUT DGND 16 6 Y1 32.768 kHz
SCLKI
BP / UP J1 U2 74HC4050 U3 74HC125 S2 A1 A0 CONV BP / UP
CLKIN
R2 200
-5 C1 0.1 µF
Note:
Remove R25 Isolate U3-3 Isolate U3-8 Jumper U1-6 to U1-18
AN45REV1
Figure 1. Schematic of CDB5504 Modified for the CAPTURE Interface
· Notes ·