CXA1797 SONY [Sony Corporation], CXA1797 Datasheet - Page 21

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CXA1797

Manufacturer Part Number
CXA1797
Description
Dolby B-C Type Noise Reduction System with Recording Equalizer Amplifier
Manufacturer
SONY [Sony Corporation]
Datasheet
Description of Operation
1. Logic Usage
Note 1) S mode takes precedence over other noise reduction modes. (When turning noise reduction off,
Note 2) All data is initialized to "1" when a reset is executed.
2. Serial Data Format
Note 3) In this instance, have the LATCH signal rise while CLK is high.
The CXA1797Q is controlled by 11-bit serial data.
An overview of the serial data format is shown below.
D10
D11
D1
D2
D3
D4
D5
D6
D7
D8
D9
(Note 1)
select BC mode.)
When using CLK and LATCH as normal high:
DATA
XRST
CLK
CLK
LATCH
When using CLK and LATCH as normal low
DATA
LATCH
XRST
NR ON/OFF
PB/REC
METER
RMUTE
SPEED
LMUTE
METAL
Name
BC/S
A/B
B/C
EQ
D1 D2 D3 D4 D5 D6 D7 D8 D9 D10 D11
D1 D2 D3 D4 D5 D6 D7 D8 D9 D10 D11
NORM
METAL OFF
120µs
DECK A
METER GAIN NORM
PB MODE
LINE MUTE ON
REC MUTE ON
DOLBY NR B or C
DOLBY NR B
DOLBY NR OFF
Function (DATA 1)
(Note 3)
—21—
:
(Note 2)
HIGH
METAL ON
70µs
DECK B
METER GAIN HIGH (+12dB)
REC MODE
LINE MUTE OFF
REC MUTE OFF
DOLBY NR S
DOLBY NR C
DOLBY NR ON
DATA is read at the
rising edge of CLK.
LATCH low : hold
LATCH high : load
Reset operation when low
(when reset is required)
DATA is read at the
rising edge of CLK.
LATCH low : hold
LATCH high : load
Reset operation when low
(when reset is required)
Function (DATA 0)
CXA1797Q

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