PCM3793RHB BURR-BROWN [Burr-Brown Corporation], PCM3793RHB Datasheet - Page 16

• Manufacturer Part Number: PCM3793RHB
• Description: 16-Bit, Low-Power Stereo Audio CODEC With Microphone Bias, Headphone, and Digital Speaker Amplifier
• Manufacturer: BURR-BROWN [Burr-Brown Corporation]

PCM3793
PCM3794
SLES193A – AUGUST 2006 – REVISED SEPTEMBER 2006
16
PCM3793/94 DESCRIPTION
Analog Input
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.
Gain Settings for Analog Input
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]).
A/D Converter
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.
D/A Converter
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).
Common Voltage
The V
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.
Line Output
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-V
10-k
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 V
Headphone Output
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-
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 V
Headphone Plug Insertion Detection
The HDTI pin detects the insertion status of headphone plug and writes the status to register 77 (HPDS), which
can be read by the I
headphone
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.
CC
COM
load. These outputs include an analog volume amplifier, except for the HPCOM/MONO pin that can be
with zero data input.
pin is normally biased to 0.5 V
and
speaker
2
C interface. The polarity of the status indication can be inverted by register 75 (HPDP). The
amplifiers
are
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CC
, and it provides the common voltage to internal circuitry. It is
rms
disabled
output by register 74 (HPS[1:0]). The line outputs can drive a
or
enabled
automatically
CC
load, either through a dc
with zero data input.
by
headphone
www.ti.com
plug