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CDB5509 CAPTURE INTERFACE

By John Lis INTRODUCTION

Application Note
CDB5509 CAPTURE INTERFACE
By John Lis INTRODUCTION
REMOVE R25 JUMPER U1-5 to U1-14 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
+5V D1 6.8V GND + C2 10 uF C5 +5 C9 0.1 uF + 2 LT1019 -2.5 V 4 6 5 External VREF
MODIFICATIONS TO THE CDB5509 FOR INTERFACING TO CDBCAPTURE
R22 +5 10 VD+ C10 0.1 uF 11 DGND VA+ 13 VD+ CAL R27 1K R26 1K C19 10nF C20 10nF 3 C17 TP10 9 10 CONV VREF+ TP9 VREFCS 1 TP8 6 U1 2B CS5509 3A DRDY TP11 16 TP12 15 TP13 14 R23 100k 14 R24 100k R25 100k U2F 8 5 U3B 4 VD+ 100k 6 VD+ 14 3 0.1 uF SCLKI 2 C18 U3A R1 1 BP / UP 100k J1 R21 8 AIN0.01 uF 47k 8 10 XIN 4 XOUT 5 Y1 32.768 kHz GND 12 7 U3C 9 VD+ S2 U2 74HC4050 U3 74HC125 A1 A0 R3 50 CLKIN R2 200 CONV BP / UP 15 SCLKO TP7 10 U2D 9 U2C 7 4 U2B 5 VD+ R19 100k VD+ R20 100k R18 A0 47k A1 2 0.1 uF 1 U2A 2 3 47k CS VD+ R17 VD+ CONV CAL + C16 10 uF +5 +5 DRDY SCLK C11 0.01 uF R10 20k R11 100k J2 CAL SDATA
R9 +5 +5 C7 0.1 uF 10
0.1 uF
1A 1B 2A R8 C8 25k 0.1 uF
DRDY 11 U2E 12 SDATA
SDATA
TP14 402 AIN+ R31 100k AINR12 100k 402 R13 R4 C15 TP15 TP6 7 AIN+ BP / UP 6 11 13 U3D
R16 12
Note:
Remove R25 Isolate U3-3 Isolate U3-8 Jumper U1-5 to U1-14
AN46REV1
Figure 1. Schematic of CDB5509 Modified for the CAPTURE Interface
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