PCM1808
www.ti.com
SLES177A–APRIL 2006–REVISED AUGUST 2006
Functional Block Diagram
Antialias
LPF
Delta-Sigma
Modulator
BCK
LRCK
DOUT
FMT
V
L
IN
Serial
Interface
×1/64
Decimation
Filter
with
High-Pass Filter
V
REF
Reference
Mode/
Format
Control
MD1
Antialias
LPF
Delta-Sigma
Modulator
MD0
V R
IN
Clock and Timing Control
SCKI
Power Supply
V
CC
AGND DGND
V
DD
B0004-10
TYPICAL PERFORMANCE CURVES OF INTERNAL FILTERS
All specifications at TA = 25°C, VCC = 5 V, VDD = 3.3 V, master mode, fS = 48 kHz, system clock = 512 fS, 24-bit data, unless
otherwise noted.
DECIMATION FILTER FREQUENCY RESPONSE
OVERALL CHARACTERISTICS
STOP-BAND ATTENUATION CHARACTERISTICS
50
0
0
−10
−20
−30
−40
−50
−60
−70
−80
−90
−100
−50
−100
−150
−200
0
8
16
24
32
0.00
0.25
0.50
0.75
1.00
Normalized Frequency [× f ]
Frequency [× f ]
S
S
G001
G002
Figure 1.
Figure 2.
6
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