WM8770 datasheet(24/52 Pages) WOLFSON

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WM8770

Production Data

PD Rev 4.1 June 2005

DSP LATE MODE

In DSP late mode, the MSB of DAC channel 1 left data is sampled by the WM8770 on the first BCLK

rising edge following a DACLRC rising edge. DAC channel 1 right and DAC channels 2, 3 and 4 data

follow DAC channel 1 left data (Figure 19).

Figure 19 DSP Late Mode Timing Diagram – DAC Data Input

The MSB of the left channel ADC data is output on DOUT and changes on the same falling edge of

BCLK as the low to high ADCLRC transition and may be sampled on the rising edge of BCLK. The

right channel ADC data is contiguous with the left channel data (Figure 20).

Figure 20 DSP Late Mode Timing Diagram – ADC Data Output

In both early and late DSP modes, DACL1 is always sent first, followed immediately by DACR1 and

the data words for the other 6 channels. No BCLK edges are allowed between the data words. The

word order is DAC1 left, DAC1 right, DAC2 left, DAC2 right, DAC3 left, DAC3 right, DAC4 left, DAC4

right.

CONTROL INTERFACE OPERATION

The WM8770 is controlled using a 3-wire serial interface in either an SPI compatible

configuration or a CCB (Computer Control Bus) configuration.

The interface configuration is determined by the state of the CE pin on the rising edge of the

RESETB pin. If the CE pin is low on the rising edge of RESETB, CCB configuration is selected. If CE

is high on the rising edge of RESETB, SPI compatible configuration is selected.

The control interface is 5V tolerant, meaning that the control interface input signals CE, CL and DI

may have an input high level of 5V while DVDD is 3V. Input thresholds are determined by DVDD.

RESETB is also 5V tolerant.

DACLRC

BCK

DIN1

Input Word Length (IWL)

1/fs

CHANNEL 1

LEFT

n-1

LSB

MSB

n-1

CHANNEL 1

RIGHT

CHANNEL 2

LEFT

n-1

CHANNEL 4

RIGHT

NO VALID DATA

ADCLRC

BCK

DOUT

Input Word Length (IWL)

1/fs

LEFT CHANNEL

n-1

LSB

MSB

n-1

RIGHT CHANNEL

NO VALID DATA

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