CXD2728Q Datasheet, PDF (1/61 Pages) Sony Corporation – Single-Chip Dolby Pro Logic Surround Decoder

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, VSS = 0V)
• Supply voltage VDD
VSS – 0.5 to +4.6
V
AVDD ^∗1 AVss – 0.5 to + 4.6
V
• Input voltage VID VSS – 0.5 to VDD + 0.5 V
∗2 _{Vss – 0.5 to 5 to Min (VDD + 4.6, 7.0) V}
VIA ^∗3 AVss – 0.5 to AVD + 0.5 V
• Output voltage VOD VSS – 0.5 to VDD + 0.5 V
∗4 _{Vss – 0.5 to Min (VDD + 4.6, 7.0) V}
VOA ^∗3 AVss – 0.5 to AVDD + 0.5 V
• Storage temperature
Tstg
–55 to +150
°C
∗1 _{Analog power supply including AVDX}
∗2 _{Pins 28, 31, 32 and 76}
∗3 _{Analog input/output pin}
∗4 _{Pin 29}
80 pin QFP (Plastic)
Recommended Operating Conditions
• Supply voltage VDD 3.0 to 3.6 (3.3 typ.) V
AVDD 3.1 to 3.5 (3.3 typ.) V
Note) Use this IC under the following condition
during the normal operation except for the
power on.
• Supply voltage difference VDD ≤ AVDD + 0.3
V
VSS ≤ AVSS – 0.3
V
• Operating temperature
Ta
–20 to +75
°C
Input/Output Capacitance (VDD = VI = 0V, f = 1MHz)
• Input capacitance CIN
9 (max.)
pF
• Output capacitance COUT
11 (max.)
pF
• Input/output capacitance
CI/O
11 (max.)
pF
Maximum Current Consumption
(Ta = 25°C, VDD = 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
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.
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.
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