STA328

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FUNCTIONAL DESCRIPTION

5.1 PIN DESCRIPTION

5.1.1

OUT1A, 1B, 2A & 2B (Pins 16, 10, 9 & 3)

Output Half Bridge PWM Outputs 1A, 1B, 2A & 2B provide the inputs signals to the speaker devices.

5.1.2

RESET (Pin 22)

Driving RESET low sets all outputs low and returns all register settings to their defaults. The reset is asyn-

chronous to the internal clock.

5.1.3

5.1.4

GNDA & VDDA: Phase Locked Loop Power (Pins 28-29)

The phase locked loop power is applied here. This +3.3V supply must be well bypassed and filtered for

noise immunity. The audio performance of the device is critically dependent upon the PLL circuit.

5.1.5

CLK: Master Clock In (Pin 27)

This is the master clock in required for the operation of the digital core. The master clock must be an in-

teger multiple of the LR clock frequency. Typically, the master clock frequency is 12.288 MHz (256*Fs) for

a 48kHz sample rate, which is the default at power-up. Care must be taken to avoid over-clocking the

device i.e provide the device with the nominally required system clock; otherwise, the device may not prop-

erly operate or be able to communicate.

5.1.6

FILTER_PLL: PLL Filter (Pin 26)

PLL Filter connects to external filter components for PLL loop compensation. Refer to the schematic dia-

gram for the recommended circuit.

5.1.7

BICKI: Bit Clock In (Pin 32)

The serial or bit clock input is for framing each data bit. The bit clock frequency is typically 64*Fs, for ex-

5.1.8

SDI_12: Serial Data Input (Pin 30)

PCM audio information enters the device here. Six format choices are available including I2S, left- or right-

justified, LSB or MSB first, with word widths of 16, 18, 20 and 24 bits.

5.1.9

LRCKI: Left/Right Clock In (Pin 31)

The Left/Right clock input is for data word framing. The clock frequency will be at the input sample rate Fs.

5.2 AUDIO PERFORMANCE

TBD

5.3 PIN CONNECTION (Top View)

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a transmitter and any device that reads the data as a receiver. The device that controls the data transfer

is known as the master and the other as the slave. The master always starts the transfer and provides

the serial clock for synchronization. The STA328 is always a slave device in all of its communications.