Datasheet
PRODUCT OVERVIEW
ANALOG INPUTS
ANALOG OUTPUTS
PCM3168A
PCM3168A-Q1
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......................................................................................................................................................................................... SBAS452 – SEPTEMBER 2008
The PCM3168A and PCM3168A-Q1 are high-performance, multi-channel codecs targeted for automotive audio
applications such as external amplifiers, as well as home multi-channel audio applications (for example, home
theaters and A/V receivers). The PCM3168A and PCM3168A-Q1 consist of six-channel analog-to-digital
converters (ADCs) and eight-channel digital-to-analog converters (DACs). The ADC input is selectable between
single-ended and differential inputs. The DAC output type is fixed with a differential configuration. The
PCM3168A and PCM3168A-Q1 support 24-bit linear PCM input and output data in standard audio formats
(left-justified, right-justified, and I
2
S), DSP and TDM formats, and various sample frequencies from 8 kHz to 192
kHz (the ADC configuration supports only up to 96 kHz). The TDM format is useful to save interface bus line
numbers for multi-channel audio data communication between the codec and digital audio processor. The
PCM3168A and PCM3168A-Q1 offer three modes for device control: two-wire I
2
C software, four-wire SPI
software, and hardware modes.
The PCM3168A and PCM3168A-Q1 include six ADCs, each with individual pairs of differential voltage input pins,
as shown in Table 1 . Additionally, the PCM3168A and PCM3168A-Q1 have the capability of single-ended inputs.
The full-scale input voltage is (0.2 × VCCAD1) V
RMS
at the single-ended input mode and (0.4 × VCCAD1) V
RMS
at the differential input mode. The input mode is selected by the MODE pin in hardware control mode or by
register settings in the software control mode. In single-ended mode, VINx+ pins are used and VINx – pins must
be terminated with AGNDAD1/2 via a capacitor or terminated with VCOMAD.
Table 1. Pin Assignments in Differential and Single-Ended Input Modes
CHANNEL DIFFERENTIAL INPUT MODE SINGLE-ENDED INPUT MODE
1 (ADC1) VIN1+, VIN1 – VIN1+
2 (ADC2) VIN2+, VIN2 – VIN2+
3 (ADC3) VIN3+, VIN3 – VIN3+
4 (ADC4) VIN4+, VIN4 – VIN4+
5 (ADC5) VIN5+, VIN5 – VIN5+
6 (ADC6) VIN6+, VIN6 – VIN6+
The PCM3168A and PCM3168A-Q1 include eight DACs, each with individual pairs of differential voltage inputs
pins, as shown in Table 2 . The full-scale output voltage is (1.6 × VCCDA1) V
PP
in differential mode. DC-coupled
loads are allowed in addition to ac-coupled loads if the load resistance conforms to the specification.
Table 2. Pin Assignments for Differential Output
CHANNEL DIFFERENTIAL OUTPUT
1 (DAC1) VOUT1+, VOUT1 –
2 (DAC2) VOUT2+, VOUT2 –
3 (DAC3) VOUT3+, VOUT3 –
4 (DAC4) VOUT4+, VOUT4 –
5 (DAC5) VOUT5+, VOUT5 –
6 (DAC6) VOUT6+, VOUT6 –
7 (DAC7) VOUT7+, VOUT7 –
8 (DAC8) VOUT8+, VOUT8 –
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Product Folder Link(s): PCM3168A PCM3168A-Q1