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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： | 8/67页 |
| 文件大小： | 1417K |
| 代理商： | PCM3794RHBTG4 |
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PCM3793/94 DESCRIPTION
Analog Input
Gain Settings for Analog Input
A/D Converter
D/A Converter
Common Voltage
Line Output
Headphone Output
Headphone Plug Insertion Detection
SLES193C – AUGUST 2006 – REVISED FEBRUARY 2007
The AIN1L, AIN1R, AIN2L, AIN2R, AIN3L, and AIN3R pins can be used as microphone or line inputs with
selectable 0- or 20-dB boost and 1-Vrms input. All analog inputs have high input impedance (20 k
), which is
not changed by gain settings. One pair of inputs is selected by register 87 (AIL[1:0], AIR[1:0]). AIN1L and AIN1R
can be used as monaural differential inputs.
Analog signals can be adjusted from 30 dB to –12 dB in 1-dB steps following the 0- or 20-dB boost amplifier.
The gain level can be set for each channel by registers 79 and 80 (ALV[5:0], ARV[5:0]).
The ADC includes a multilevel delta-sigma modulator, aliasing filter, decimation filter, high-pass filter, and notch
filter and can accept a 1-Vrms full-scale voltage input. The decimation filter has a digital soft mute controlled by
register 81 (RMUL, RMUR). The high-pass filter can be disabled by register 81 (HPF[1:0]) and the notch filter
can be disabled by registers 96 to 104 if it is not necessary to cancel a dc offset or compensate for wind noise.
The DAC includes a multilevel delta-sigma modulator and interpolation filter. These can be used to obtain high
PSRR, low jitter sensitivity, and low out-of-band noise quickly and easily. The interpolation filter includes digital
attenuator, digital soft mute, three-band tone control (bass, midrange and treble), and 3-D sound controlled by
registers 92 to 95. The de-emphasis filter (32, 44.1 and 48 kHz) is controlled by registers 68 to 70 (ATL[5:0],
ATR[5:0], PMUL, PMUR, DEM[1:0]). Oversampling rate control can reduce out-of-band noise when operating at
low sampling rate by using register 70 (OVER).
The VCOM pin is normally biased to 0.5 VCC, and it provides the common voltage to internal circuitry. It is
recommended that a 10-
F capacitor be connected between this pin and ground to provide clean voltage and
avoid pop noise. The PCM3793/94 may have a little pop noise on each analog output if a capacitor smaller than
10
F is used.
The HPOL/LOL and HPOR/LOR and HPCOM/MONO pins can be used as a monaural single-ended, monaural
differential, or stereo single-line output with 1-Vrms output by register 74 (HPS[1:0]). The line outputs can drive a
10-k
load. These outputs include an analog volume amplifier, except for the HPCOM/MONO pin that can be
set from 6 dB to –70 dB and mute with 0.5-, 1-, 2- or 4-dB steps for each output, as controlled by registers 64
and 65 (HLV[5:0], HRV[5:0], HMUL, HMUR). A dc blocking capacitor is not required when connecting to an
external speaker amplifier with monaural differential input. The center voltage is 0.5 VCC with zero data input.
The HPOL/LOL, HPOR/LOR, and HPCOM/MONO pins are stereo, monaural, or monaural differential
headphone outputs with more than 30 or 40 mWrms output power into a 32- or 16-
load, either through a dc
blocking capacitor or without a capacitor, as selected by register 74 (HPS[2:0]). These outputs include analog
volume amplifiers, except for the HPCOM/MONO pin, which can be set from 6 dB to –70 dB with 0.5-, 1-, 2- or
4-dB steps for each output using registers 64 and 65 (HLV[5:0], HRV[5:0], HMUL, HMUR). The center voltage is
0.5 VCC with zero data input.
The HDTI pin detects the insertion status of headphone plug and writes the status to register 77 (HPDS), which
can be read by the I2C interface. The polarity of the status indication can be inverted by register 75 (HPDP). The
headphone
and
speaker
amplifiers
are
disabled
or
enabled
automatically
by
headphone
plug
insertion/extractrion if register 75, HPDE = 1. They are controlled by register settings if register 75, HPDE = 0.
HPCOM/MONO is not affected by the status when register 74, CMS[0] = 1.
16
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