Functions

1. Data Input and Output (DIN1, DIN2, E/DOUT)

The DIN1 pin has a built-in amplifier, and can receive signals with an amplitude of about 400 mVp-p (coaxial input).

The DIN2 pin is only for use with optical modules.

Note that although the data input pins are controlled by the microprocessor, DIN1 can be selected when a

microprocessor is not used. The microprocessor interface pins must be tied low in such applications.

The E/DOUT normally outputs channel status information. However, it can be set to output either the input bi-phase

data or the validity flag by command codes from the microprocessor.

2. PLL (R, VIN, VCO, AVOCK)

This circuit includes a built-in VCO and supports sampling frequencies of 32, 44.1, and 48 kHz.

The resistor connected to R functions as both the VCO gain control and as temperature compensation. The VIN pin

sets the VCO free-running frequency.

The PLL circuit can be reset within a fixed period when it operates incorrectly, for example, if a lock pull-in failure

occurs, by inputting an asynchronous, continuously operating clock signal to the AVOCK pin.

3. Clock Settings and Output (FS128, BCK, LRCK, DATAOUT, CKSEL, CKOUT)

A 128fs clock signal is output from the FS128 pin. Figure 1 shows the output timing for the BCK, LRCK, and

DATAOUT pins.

The CKOUT clock output is set by the CKSEL pin as listed in the table below.

The microprocessor interface format is also set by CKSEL as listed in the table below.

No. 5237-8/16

LC8905V

CKSEL

CKOUT

L

384fs clock output

H

512fs clock output

CKSEL

Microprocessor interface

L

Figure 2

H

Figure 3