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BTM521 DATASHEET

14

5.2.2

ADC Sample Rate Selection and Warping

ADC supports the following sample rates: 8kHz, 11.025kHz, 16kHz, 22.05kHz, 24kHz,

32kHz,44.1kHz,48kHz.

One of the main concerns for stereo wireless music applications is the ability to keep

sample rates for the CODECs at both ends of the wireless link in synchronization. A VM

function adjusts the sample rate using a ‘warping’ function to tune the sample rate to the

required value. The ADC warp function allows the sample rate to be changed by

+/-3%, in steps of 1/2

quality – the distortion introduced when warping the sample rate is negligible.

5.2.3

ADC Gain

The ADC contains two gain stages for each channel, an analogue and a digital gain stage.

5.2.4

DAC

The DAC contains two second order Sigma Delta converters allowing two separate

5.2.5

DAC Sample Rate Selection and Warping

Each DAC supports the following sample rates: 8kHz, 11.025kHz, 16kHz, 22.05kHz,

24kHz, 32kHz,44.1kHz, 48kHz,96kHz.

One of the main concerns for the DAC used in stereo wireless music applications is the

ability to keep

sample

rates

for

the

CODECs

at

both

ends

of

the

wireless link in synchronization. A VM function adjusts the sample rate using a

‘warping’ function to tune the sample rate to the required value. The ADC warp

function allows the sample rate to be changed by +/-3%, in steps of 1/2

The warp function preserves the signal quality – the distortion introduced when warping

the sample rate is negligible.

5.2.6

DAC Gain

The DAC contains two gain stages for each channel, a digital and an analogue gain stage.

5.2.7

Mono Operation

Mono operation is single channel operation of the stereo CODEC. The left channel

represents the single

mono channel

for

audio in

and

audio

out.

In

mono

operation the right channel is auxiliary mono channel that may be used in dual

mono channel operation.