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92HD87

SINGLE CHIP PC AUDIO SYSTEM / 40-pad QFN RoHS package

Integrated Device Technology 

92HD87

SINGLE CHIP PC AUDIO SYSTEM, CODEC+STEREO SPEAKER AMPLIFIER+CAPLESS HP+LDO

When in 1.5V mode, the codec can correctly decode BITCLK, SYNC, RESET# and SDO as they

operate at 1.5V; additionally it will drive SDI and SDO at 1.5V. None of the GPIOs are affected, as

they always function at their nominal voltage (DVDD or AVDD).

2.11. Multi-channel capture

The capability to assign multiple “ADC Converters” to the same stream is supported to meet the

microphone array requirements of Vista and future operating systems. Single converter streams are

still supported this is done by assigning unique non zero Stream IDs to each converter. All capture

devices (ADCs 0 and 1) may be used to create a multi-channel input stream. There are no restric-

tions regarding digital microphones.

The ADC Converters can be associated with a single stream as long the sample rate and the bits per

sample are the same. The assignment of converter to channel is done using the “CnvtrID” widget

and is restricted to even values. The ADC converters will always put out a stereo sample and there-

fore require 2 channels per converter.

The stream will not be generated unless all entries for the targeted converters are set identically, and

the total number of assigned converter channels matches the value in the NmbrChan field. These

are listed the “Multi-Converter Stream Critical Entries.” table.

An example of a 4 Channel Steam with ADC0 supplying channels 0&1 and ADC1 supplying chan-

nels 2 & 3 is shown below. A 4 Channel stream can be created by assigning the same non-zero

stream id “Strm= N” to both ADC0 and ADC1. The sample rates must be set the same and the num-

ber of channels must be set to 4 channels “NmbrChan = 0011”.

ADC1 CnvtrID

ADC0 CnvtrID

(NID = 0x08)

[3:0]

(NID = 0x07)

[3:0]

Ch = 2

Ch=0

Table 4. Example channel mapping

Figure 1. Multi-channel capture

ADC0.CnvrtID.Channel = 0

ADC1.CnvrtID.Channel = 2

Stream ID

Data

Length

ADC0.CnvrtID.Channel = 2

ADC1.CnvrtID.Channel = 0

Stream ID

Data

Length

ADC0

Left Channel

ADC1

Left Channel

ADC0

Right Channel

ADC1

Right Channel

ADC1

Left Channel

ADC0

Left Channel

ADC1

Right Channel

ADC0

Right Channel

The following figure describes the bus waveform for a 24-bit, 48KHz capture stream with ID set to 1.

IDT CONFIDENTIAL

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©2009 INTEGRATED DEVICE TECHNOLOGY, INC.

V 0.995 01/11

92HD87

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