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| 型號： | PCM3794RHB |
| 元件分類： | Codec |
| 英文描述： | 16-Bit, Low-Power Stereo Audio CODEC With Microphone Bias, Headphone, and Digital Speaker Amplifier |
| 中文描述： | 16位，低功耗立體聲音頻編解碼器麥克風偏置，耳機，揚聲器放大器和數(shù)字 |
| 文件頁數(shù)： | 19/63頁 |
| 文件大小： | 915K |
| 代理商： | PCM3794RHB |
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t
w(SCKH)
SCKI
t
w(SCKL)
0.7 V
IO
0.3 V
IO
T0005-12
Power-On Reset and System Reset
Power On/Off Sequence
PCM3793
PCM3794
SLES193A–AUGUST 2006–REVISED SEPTEMBER 2006
PARAMETERS
SYMBOL
t
w(SCKH)
t
w(SCKL)
MIN
7
7
UNITS
ns
ns
System-clock pulse duration, high
System-clock pulse duration, low
Figure 25. System Clock Timing
The power-on-reset circuit outputs a reset signal, typically at V
DD
= 1.2 V, and this circuit does not depend on
the voltage of other power supplies (V
CC
, V
PA
and V
IO
). Internal circuits are cleared to default status, then signals
are removed from all analog and digital outputs. The PCM3793/94 does not require any power supply
sequencing. Register data must be written after turning all power supplies on.
System reset is enabled by setting register 85 (SRST), and all register are cleared automatically. All circuits are
reset to their default status at once. Note that the PCM3793/94 has audible pop noise on the analog outputs
when enabling SRST.
To reduce audible pop noise, a sequence of register settings is required after turning all power supplies on when
powering up, or before turning the power supplies off when powering down. If some modules are not required for
a particular application or operation, they should be placed in the power-down state after performing the
power-on sequence. The recommended power-on and power-off sequences are shown in
Table 2
and
Table 3
,
respectively.
Table 2. Recommended Power-On Sequence
STEP
REGISTER
SETTINGS
–
4027h
4127h
4227h
4327h
4427h
4527h
4620h
4BC0h
5102h
5A10h
49E0h
5601h
4803h
5811h
49FCh
NOTE
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
Turn on all power supplies
(1)
Headphone amplifier L-ch volume (–6 dB)
(2)
Headphone amplifier R-ch volume (–6 dB)
(2)
Speaker amplifier L-ch volume (–6 dB)
(2)
Speaker amplifier R-ch volume (–6 dB)
(2)
Digital attenuator L-ch (–24 dB)
(2)
Digital attenuator R-ch (–24 dB)
(2)
DAC audio interface format (left-justified)
(3)
Headphone detection enable and inverting polarity. Short and thermal detection enable
ADC audio interface format (left-justified)
(3)
V
COM
ramp up/down time control. PG1, PG2 gain control (0 dB)
DAC (DAL, DAR) and analog bias power up
Zero-cross detection enable
Analog mixer (MXL, MXR) power up
Analog mixer input (SW2, SW5) select
Headphone amplifier (HPL, HPR, HPC) power up
(1)
Power supply sequencing is not required. It is recommended to set register data with system clock input after turning all power supplies
on.
Any level is acceptable for volume or attenuation. Level should be resumed by register data recorded when system power off.
Audio interface format should be set to match the DSP or decoder being used.
(2)
(3)
19
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相關代理商/技術參數(shù) |
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|---|---|
| PCM3794RHBR | 功能描述:接口—CODEC Very Low-Pwr Stereo CODEC RoHS:否 制造商:Texas Instruments 類型: 分辨率: 轉(zhuǎn)換速率:48 kSPs 接口類型:I2C ADC 數(shù)量:2 DAC 數(shù)量:4 工作電源電壓:1.8 V, 2.1 V, 2.3 V to 5.5 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:DSBGA-81 封裝:Reel |
| PCM3794RHBRG4 | 功能描述:接口—CODEC Very Low-Pwr Stereo CODEC RoHS:否 制造商:Texas Instruments 類型: 分辨率: 轉(zhuǎn)換速率:48 kSPs 接口類型:I2C ADC 數(shù)量:2 DAC 數(shù)量:4 工作電源電壓:1.8 V, 2.1 V, 2.3 V to 5.5 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:DSBGA-81 封裝:Reel |
| PCM3794RHBT | 功能描述:接口—CODEC Very Low-Pwr Stereo CODEC RoHS:否 制造商:Texas Instruments 類型: 分辨率: 轉(zhuǎn)換速率:48 kSPs 接口類型:I2C ADC 數(shù)量:2 DAC 數(shù)量:4 工作電源電壓:1.8 V, 2.1 V, 2.3 V to 5.5 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:DSBGA-81 封裝:Reel |
| PCM3794RHBTG4 | 功能描述:接口—CODEC Very Low-Pwr Stereo CODEC RoHS:否 制造商:Texas Instruments 類型: 分辨率: 轉(zhuǎn)換速率:48 kSPs 接口類型:I2C ADC 數(shù)量:2 DAC 數(shù)量:4 工作電源電壓:1.8 V, 2.1 V, 2.3 V to 5.5 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:DSBGA-81 封裝:Reel |
| PCM-38 | 功能描述:電線鑒定 Pre-Printed WM Card, Vinyl Cloth, .22" W RoHS:否 制造商:TE Connectivity / Q-Cees 產(chǎn)品:Labels and Signs 類型: 材料:Vinyl 顏色:Blue 寬度:0.625 in 長度:1 in |
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