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参数资料
| 型号： | PCM3794RHBTG4 |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 通信及网络 |
| 英文描述： | SPECIALTY TELECOM CIRCUIT, PQCC32 |
| 封装： | 5 X 5 MM, GREEN, PLASTIC, QFN-32 |
| 文件页数： | 13/67页 |
| 文件大小： | 1417K |
| 代理商： | PCM3794RHBTG4 |
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Power-Supply Current
SLES193C – AUGUST 2006 – REVISED FEBRUARY 2007
Table 3. Recommended Power-On Sequence (continued)
STEP
REGISTER
NOTE
SETTINGS
17
4C03h
Speaker amplifier shut down release
18
4A01h
VCOM power up
19
523Fh
Analog front end (ADL, ADR, D2S, MCB, PG1, 2, 5, 6) power up
20
5711h
Analog input (MUX3, MUX4) select. Analog input (MUX1, MUX2) select
21
4F0Ch
Analog input L-ch (PG3) volume (0 dB)(2)
22
500Ch
Analog input R-ch (PG4) volume (0 dB)(2)
23
–
Any settings for other devices or wait time(4)(5)
24
49FFh
Speaker amplifier (SPL, SPR) power up (5)
(4)
The PCM3793 requires time for VCOM to reach the common level from GND level. The delay depends on the capacitor value for VCOM
and the setting of register 90 CMT[1:0]. Wait time [s] = 4
× C
VCOM× RCMT
(5)
The PCM3794 does not require this setting because it has no speaker output.
Table 4. Recommended Power-Off Sequence
STEP
REGISTER
NOTE
SETTINGS
1
447Fh
DAC L-ch digital soft-mute enable(1)
2
457Fh
DAC R-ch digital soft-mute enable(1)
3
5132h
ADC L-ch/R-ch digital soft-mute enable, ADC audio interface format (left-justified)(2)
4
5811h
Analog mixer input (SW2, SW5) Select
5
49FFh
Headphone amplifier (HPL, HPR, HPC) power up (4), speaker amplifier (SPL, SPR) power up(3)(4)
6
5200h
Analog front end (ADL, ADR, D2S, MCB, PG1, 2, 5, 6) power down
7
5A10h
VCOM ramp up/down time control, PG1, PG2 gain control (0 dB)
8
4A00h
VCOM power down
9
–
Wait time (100 ms)
10
5A00h
VCOM ramp up/down time control
11
–
Wait time (100 ms)
12
5A20h
VCOM ramp up/down time control
13
–
Wait time (4000 ms)
14
5A30h
VCOM ramp up/down time control
15
49E0h
Headphone amplifier (HPL, HPR, HPC) power down, speaker amplifier (SPL, SPR) power down
16
4800h
Analog mixer (MXL, MXR) power down
17
4900h
DAC (DAL, DAR) and analog bias power down
18
–
Turn off all power supplies(5)
(1)
Any level is acceptable for volume or attenuation.
(2)
Audio interface format should be set according to DSP or decoder.
(3)
PCM3794 has no speaker amplifier.
(4)
These modules must be powered up during the power-down sequence.
(5)
Power supply sequencing is not required. It is recommended to turn off all power supply after register settings with system clock input.
The current consumption of the PCM3793/94 depends on power up/down status of each circuit module. In order
to reduce the power consumption, disabling each module is recommended when it is not used in an application
or operation. Table 5 shows the current consumption in some states.
20
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