AK4145 Datasheet, PDF (9/27 Pages) Asahi Kasei Microsystems – Digital BTSC Stereo Encoder

[AK4145]
OPERATION OVERVIEW
■ Parallel/Serial Control Mode
Pins (Parallel Control Mode) or registers (Serial Control Mode) control each function of the AK4145 (Table 1). In
Parallel Control Mode (PSN pin = “H”), register settings are ignored, and pin settings are ignored in Serial Control Mode
(PSN pin = “L”). In Serial Control Mode, the default state is in software reset and soft-muted. Write “1” to RSTN bit and
“0” to SMUTE bit for normal operation. The PSN pin must be fixed during power-up.
Function
Parallel mode
Serial mode
Sampling Rate
32k, 48k
32k, 44.1k, 48k
I2S,
I2S,
Audio Data Format
MSB justified
MSB justified,
LSB justified
Stereo Volume Control
-
X
De-emphasis Filter
-
X
Soft Mute
-
X
MONO Mode
-
X
Audio Composite Volume Control
-
X
Sync Source for Pilot Generation
Video Signal
Video Signal,
27MHz Clock
Stereo Matrix Control
-
X
Table 1. Function List (X: Available, -: Not available)
■ System Reset and Power-down Mode
The AK4145 should be reset once by bringing the PDN pin = “L” upon power-up.
PDN pin: Power down pin
“H”: Normal operation
“L”: Device power down. All registers are initialized.
■ Audio Sampling Rate
The AK4145 supports 3 sampling rates (32kHz, 44.1kHz and 48kHz). The FS1-0 bits select the sampling rate in serial
control mode. The FS1 pin is only available in parallel control mode (Table 2, Table 3). These bits and pin can be changed
without a reset by the PDN pin.
FS1bit
FS0 bit Sampling rate
0
0
32kHz
0
1
44.1kHz
1
0
48kHz
(default)
1
1
(Reserved)
Table 2. Sampling rate select in serial control mode
FS1pin
Sampling rate
0
32kHz
1
48kHz
Table 3. Sampling rate select in parallel control mode
MS0982-E-01
-9-
2010/09