AK4137EQ Datasheet, PDF (55/65 Pages) Asahi Kasei Microsystems – 32bit SRC with PCM/DSD conversion

[AK4137]
■ Register Definitions
Addr Register Name D7
D6
00H Reset & Mute SMSEMI* SMT2
R/W
Default
R/W
R/W
0
0
D5
SMT1
R/W
0
D4
D3
D2
SMT0 SMUTE BYPS
R/W R/W R/W
0
0
0
D1
FORCE
STB
R/W
0
D0
RSTN
R/W
1
*SMSEMI: Semi Auto Soft Mute (AK4137)
0: Semi Auto Soft Mute Off (default)
1: Semi Auto Soft Mute ON
AK4137: The setting of the SMSEMI pin is valid. (Register setting is ignored. They cannot be set)
SMT2-0: Soft Mute Period
000: 1024/fso (default)
001: 2048/fso
010: 4096/fso
011: 8192/fso
100: 1024/fso (default)
101: 2048/fso
110: 4096/fso
111: 8192/fso
Soft Mute Cycle is determined.
In Serial Control Mode (PSN pin = “L”), settings of the SMT1 and SMT0 pins are ignored.
In Parallel Control Mode (PSN pin = “H”), settings of the SMT1 and SMT0 pins are valid.
SMUTE: Soft Mute Control
0: Soft Mute Release (default)
1: Soft Mute
In Serial Control Mode (PSN pin = “L”), the CSN/SMUTE pin functions as the CSN pin, and
SMUTE setting is ignored.
In Parallel Control Mode (PSN pin = “H”), the SMUTE pin setting is valid.
*DITHER: Add DITHER
0: DITHER OFF (default)
1: DITHER ON
AK4137: The DITHER pin becomes valid. (Register settings are ignored)
BYPS: Bypass Mode Control (Table 2)
0: SRC Mode (default)
1: SRC Bypass Mode
FORCESTB: CLKSTABLE signal (Checking signal for IRCK and OLRCK changes) is set to “1” forcibly.
0: Normal Operation (default)
1: CLKSTABLE = “1”
RSTN: Digital Reset Control
0: Reset
1: Reset Release (default)
Digital blocks are powered down by setting RSTN bit = “0”. However, I²C serial control interface
and control register blocks are not powered down, and control register values are not initialized. In
this case, control register writing is also available. Internal oscillator that generates internal clock,
regulator and reference voltage generation circuits are not powered down.
Rev. 0.2
- 55 -
2014/06