參數(shù)資料
型號(hào)： CXD2728Q
廠商： Sony Corporation
英文描述： Single-Chip Dolby Pro Logic Surround Decoder(單片杜比環(huán)繞Pro邏輯解碼器)
中文描述： 單片杜比定向邏輯環(huán)繞聲解碼器（單片杜比環(huán)繞專業(yè)邏輯解碼器）
文件頁(yè)數(shù)： 1/61頁(yè)
文件大?。?/td> 467K
代理商： CXD2728Q
Single-Chip Dolby Pro Logic Surround Decoder
Description
The CXD2728Q is a CMOS LSI developed for
Dolby Pro Logic Surround. A SRAM for short delay
and AD/DA converters are built in, and all functions
necessary for Dolby Pro Logic Surround such as an
adaptive matrix, a passive decoder including
Modified Dolby B-type NR, auto input balance, a
noise sequencer and center channel mode control
are contained on a single chip. Further, this LSI also
supports Dolby 3 Stereo and Virtual Dolby Surround.
Features
Dolby Pro Logic Surround decoding with a single
chip
2-channel 1-bit AD converter and decimation filter
4-channel 1-bit DA converter and oversampling filter
32K-bit SRAM for short delay
No separation or other variance for digital
processing
External parts reduced due to the built-in AD/DA
converters
Functions
Adaptive matrix
Center channel mode control
(Normal/Phantom/Wide)
Dolby 3 Stereo
Auto input balance control (ON/OFF)
Noise sequencer
Variable delay time (0 to 46.4ms)
7kHz low-pass filter (12dB/Oct)
Modified Dolby B-type NR
Simple SFC function
Virtual Dolby Surround
SFC mode
Absolute Maximum Ratings
(Ta = 25°C, V
SS
= 0V)
Supply voltage V
DD
AV
DD
1
AVss – 0.5 to + 4.6
Input voltage
V
ID
V
SS
– 0.5 to V
DD
+ 0.5
2
Vss – 0.5 to 5 to Min (V
DD
+ 4.6, 7.0)
V
V
IA
3
AVss – 0.5 to AVD + 0.5
Output voltage V
OD
V
SS
– 0.5 to V
DD
+ 0.5
4
Vss – 0.5 to Min (V
DD
+ 4.6, 7.0)
V
OA
3
AVss – 0.5 to AV
DD
+ 0.5
Storage temperature
Tstg
1
Analog power supply including AVDX
2
Pins 28, 31, 32 and 76
3
Analog input/output pin
4
Pin 29
V
SS
– 0.5 to +4.6
V
V
V
V
V
V
V
–55 to +150
°C
Recommended Operating Conditions
Supply voltage V
DD
AV
DD
Note)
Use this IC under the following condition
during the normal operation except for the
power on.
Supply voltage differenceV
DD
≤
AV
DD
+ 0.3
3.0 to 3.6 (3.3 typ.)
3.1 to 3.5 (3.3 typ.)
V
V
V
V
V
SS
≤
AV
SS
– 0.3
Operating temperature
Ta
–20 to +75
°C
Input/Output Capacitance
(V
DD
= V
I
= 0V, f = 1MHz)
Input capacitance C
IN
Output capacitance C
OUT
Input/output capacitance
C
I/O
9 (max.)
11 (max.)
pF
pF
11 (max.)
pF
Maximum Current Consumption
(Ta = 25°C, V
DD
= 3.6V)
Digital/analog block total: 75.8mA
Dolby level
During analog input: 200 to 300mVrms
During digital input: –20dBFS
Analog Characteristics
Conditions: Pro Logic ON
Measurement at Dolby level = 300mVrms
S/N: L, Rch = 72dB, C, Sch = 70dB
THD + N: L, Rch = 0.03%, C, Sch = 0.03%
All values typ.
Structure
Silicon gate CMOS
Applications
Equipment having Dolby Pro Logic Surround
function such as AV amplifiers, receivers and
compact music systems
– 1 –
E98Z02-PS
Sony reserves the right to change products and specifications without prior notice. This information does not convey any license by
any implication or otherwise under any patents or other right. Application circuits shown, if any, are typical examples illustrating the
operation of the devices. Sony cannot assume responsibility for any problems arising out of the use of these circuits.
CXD2728Q
80 pin QFP (Plastic)
This device is available only to parties obtaining the license from Dolby Laboratories Licensing Corporation.
"Dolby", the double-D symbol and "Pro Logic" are trademarks of Dolby Laboratories Licensing Corporation.
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