PCM3793RHB BURR-BROWN [Burr-Brown Corporation], PCM3793RHB Datasheet - Page 18

• 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
18
Short Protection
The short-circuit protection on each headphone output prevents damage to the device while an output is shorted
to V
on the outputs, the PCM3793/94 powers down the shorted amplifier at once. The short-protection status can be
monitored by reading register 77 (STHC, STHL, SCHR) through the I
operates in any enabled headphone amplifier.
Thermal Protection
The thermal protection on the speaker amplifier prevents damage to the device when the internal die
temperature exceeds approximately 150 C. Once the die temperature exceeds the thermal set point, all analog
outputs are powered down. This status can be reset by setting register 76 (RLSR, RLSL) and can be watched
by reading register 77 (STSR, STSL) on the two-wire (I
speaker amplifier.
Pop-Noise Reduction Circuit
The pop-noise reduction circuit prevents audible noise when turning the power supply on/off and powering the
device up/down in portable applications. It is recommended to establish the register settings in the sequence
that is shown in
not necessary.
Power Up/Down for Each Module
Using register 72 (PMXL, PMXR), register 73 (PBIS, PDAR, PDAL, PHPC, PHPR, PHPL, PSPR, PSPL), register
82 (PAIR, PAIL, PADS, PMCB, PADR, PADL), and register 90 (PCOM), unused modules can be powered down
to minimize power consumption (7 mW during playback only and 13 mW when recording only).
Digital Interface
All digital I/O pins can interface at various power supply voltages. The V
3.6-V power supply.
Power Supply
The V
The V
these pins (for example, V
DESCRIPTION OF OPERATION
System Clock Input
The PCM3793/94 can accept clocks of various frequencies without a PLL. They are used for clocking the digital
filters and automatic level control and delta-sigma modulators and are classified as common-audio and
application-specific clocks.
Figure 25
system clocks are determined by the settings of register 86 (MSR[2:0]) and register 85 (NPR[5:0]). Note that the
sampling rate of the application-specific clock has a little sampling error.
PA
CC
, an output is shorted to PGND, or any two outputs are shorted together. When the short circuit is detected
DD
pin and the V
pin and the V
shows the timing requirements for system clock inputs. The sampling rate and frequency of the
Table 2
Application-specific clock
PA
Common-audio clock
IO
and
pin can be connected to 2.4 V to 3.6 V. The same voltage must be applied to both pins.
pin can be connected to 1.71 V to 3.6 V. A different voltage can be applied to each of
DD
Table 1
CLOCK
= 1.8 V, V
Table
shows frequencies of the common-audio clock and application-specific clock.
3. No particular external parts are required, and power-supply sequencing is
IO
Table 1. System Clock Frequencies
= 3.3 V).
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12, 13, 13.5, 24, 26, 27, 19.2, 19.68, 38.4, 39.36 MHz
2
C) interface. Thermal protection operates in any enabled
11.2896, 12.288, 16.9344, 18.432 MHz
FREQUENCIES
IO
2
pin can be connected to a 1.71-V to
C interface. Short-circuit protection
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