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參數資料
| 型號： | CXD2719Q |
| 廠商： | Sony Corporation |
| 英文描述： | Single-Chip Dolby Pro Logic Surround Decoder(單片杜比環(huán)繞邏輯譯碼器) |
| 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)繞邏輯譯碼器） |
| 文件頁數： | 1/58頁 |
| 文件大小： | 450K |
| 代理商： | CXD2719Q |
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Single-Chip Dolby Pro Logic Surround Decoder
Description
The CXD2719Q 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 BNR,
auto input balance, a noise sequencer and center
channel mode control are contained on a single
chip.
Features
Dolby Pro Logic Surround decoding with a single
chip
2-channel 1-bit AD converter, decimation filter and
prefilter operational amplifier
4-channel 1-bit DA converter, oversampling filter
and post filter
Analog switch for DSP bypass
Analog electronic attenuator (+1.5 to –29.5dB) for
center/surround channel trim
24K-bit SRAM for short delay
No separation or other variance for digital
processing
External parts reduced by incorporating analog
circuits
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 34.8ms)
7 kHz low-pass filter (12dB/Oct)
Modified Dolby B-type NR
Simple SFC function
SFC mode
DSP bypass mode (L, R-channel through)
Structure
Silicon gate CMOS
Applications
Equipment having Dolby Pro Logic Surround
function such as AV amplifiers, receivers and
compact music systems
Absolute Maximum Ratings
(Ta = 25°C, V
SS
= 0V)
Supply voltage
V
DD
Input voltage
V
I
Output voltage
V
O
Operating temperature
Topr
Storage temperature
Tstg
V
SS
– 0.5 to +7.0
V
SS
– 0.5 to V
DD
+ 0.5
V
SS
– 0.5 to V
DD
+ 0.5
V
V
V
–20 to +70
°C
–55 to +150
°C
Recommended Operating Conditions
Supply voltage
Analog system
Digital system
Operating temperature
V
DD
4.75 to 5.25 (5.0 typ.)
4.50 to 5.25 (5.0 typ.)
V
V
Ta
–20 to +70
°C
Input/Output Capacitance
Input capacitance C
IN
Output capacitance C
OUT
Input/output capacitance
9 (max.)
11 (max.)
pF
pF
C
I/O
11 (max.)
pF
Measurement conditions: V
DD
= V
I
= 0V, F = 1MHz
Maximum Current Consumption
(Ta = 25°C, V
DD
= 5.25V)
Digital/analog block total: 166.7mA
Dolby level
During analog input: 200 to 300mVrms
During digital input: –20dBFS
Analog characteristics
Pro Logic ON: Dolby level = 300mVrms
Prefilter gain = –3.52dB
S/N: L, Rch = 80dB, C, Sch = 72dB
THD + N: L, Rch = 0.015%, C, Sch = 0.03%
All values for typ.
– 1 –
E98944-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.
CXD2719Q
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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