CDB5321 View Datasheet(PDF) - Cirrus Logic
Part Name
Description
Manufacturer
CDB5321 Datasheet PDF : 12 Pages
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CDB5321
OVERVIEW
The CDB5321 evaluation board requires three
separate power supplies for proper operation.
Figure 1 illustrates the power supply connec-
tions. The required power supply input voltages
consist of +5V, +15V, and -15V. The CS5322
filter and logic support devices on the board op-
erate from the +5V supply. The +15V and
-15V inputs are regulated down to provide +5V
and -5V supplies necessary for the CS5321
modulator. Figure 1 also illustrates the LT1019
4.5V reference used with the CS5321 modulator.
Figure 2 illustrates the CS5321 modulator cir-
cuitry, including the analog BNC input for the
test signal source. Most often switch selections
on S5 are set to HBR=1, LPWR=0, and
+5 VA
R6
VREF
From
200
Figure 1.
C26
TANT
10 µF
C22
0.1 µF 2
C50 +
0.1µF
V1+
5
C20
VREF+
TANT
68 µF
6
VREF-
8 AIN-
R1
9 AIN+
402
C6
NPO
AIN
R5
0.1 µF 10 AINR
402
C15
NPO
0.1 µF
See CS5321 Datasheet
1 AGND1
4 AGND2
7 AGND3
11 AGND4
12 AGND5
13 AGND6
14 AGND7
V1-
-5 VA 3
C27
22
0.1 µF
U2
CS5321
V2+
28
OFST
27
LPWR 26
HBR
R7
100k
R8
R9
100k 100k
S5
OFST
LPWR
HBR
20
MCLK
MSYNC 25
MDATA 18
MFLG 24
MDATA 17
MCLK
MSYNC
MDATA
MFLG
MDATA
To
Figure 4.
23
DGND1
19
DGND2
16
DGND3
15
DGND4
V2-
21
TEST POINT
C29
C19
0.1 µF + 10 µF
C40
0.1 µF
Figure 2. CS5321 Modulator Input Circuitry.
DS88DB2
17
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