PCM1712 Burr-Brown Corporation, PCM1712 Datasheet - Page 11

• Manufacturer Part Number: PCM1712
• Description: DIGITAL-TO-ANALOG CONVERTER
• Manufacturer: Burr-Brown Corporation

FIGURE 5. Mode Control Input Format, Serial Mode.
MODE 1 CONTROLS
This mode can be enabled with the sequence of 1, 0, 0 as the
first three bits on MD (pin 26). This mode allows for the
following functions:
DIGITAL DE-EMPHASIS
PCM1712 allows three different sampling rates for digital
de-emphasis. B3 and B4 are used for binary control of the
de-emphasis frequency:
TABLE VII. Serial-Mode Control Input Format (MODE: H, Pin 24).
Mode
Mode
1
2
De-emphasis
De-emphasis Frequency
Soft Mute
Double-Speed Dubbing
B0
1
1
MD
(NOTE: Cycle Time for Model Control—Cycle time for mode control must be set over 192 times of minimum system clock.)
B1
0
0
Alternation
B2
Mode 1
Mode 2
0
1
Mode
MC
ML
Bit#
On/Off
32kHz, 44.1kHz, 48kHz
On/Off
On/Off
BIT NO.
B3
B4
B5
B6
B7
B3
B4
B5
B6
B7
B0
H
H
L
DEEM2
DEEM1
MODE
MUTE
FLAG
LRPL
DSD
IIR
IIS
D6
B1
L
L
Sampling Frequency
for De-emphasis
Polarity for LRCI
Double-Speed
Not Assigned
Not Assigned
Not Assigned
De-emphasis
Input Format
D5
B2
H
L
MODE
Mute
11
DEEM2
D4
B3
Once the reset has been established on pin 27 (MC), the de-
emphasis frequency defaults to 44.1kHz. B5 can be used to
override B3 and B4; a logic low on B5 disables de-emphasis,
and a logic high on B5 forces de-emphasis at 44.1kHz.
SOFT MUTE
Soft mute is enabled when B6 is high. The soft mute occurs
gradually, unlike the forced infinite zero detection. When
the mute data bit is high, complete muting will occur in
127/fs seconds.
FUNCTION MODE SELECTION
ATT_DATA
BIT VALUE
DEEM1
B3
0
0
1
1
D3
B4
0
1
0
1
0
1
0
1
0
1
B4
DEEM1
0
1
0
1
D2
IIR
B5
SELECTED FUNCTION
Double-speed OFF
De-emphasis OFF
Double-speed ON
De-emphasis ON
Lch:high/Rch:low
Lch:low/Rch:high
0
1
MUTE
Mute OFF
LRPL
Mute ON
D1
B6
Normal
32kHz
IIS
0
PCM1712
DEEM2
FREQUENCY
DSD
44.1kHz
44.1kHz
D0
IIS
B7
48kHz
48kHz
32kHz
OFF
1
Lch:HIGH
Rch:LOW
MODE BY
DEFAULT
44.1kHz
Normal
OFF
OFF
OFF
®