BC352239A Datasheet, PDF (76/116 Pages) List of Unclassifed Manufacturers – BlueCore 3-Multimedia External

Device Terminal Descriptions
The DAC analogue amplifier unlike the ADC is a single stage amplifier with the same structure as the second
stage of the ADC analogue amplifier as shown in Figure 8.10. The structure of the DAC analogue amplifier is
similar to the second stage of the ADC analogue amplifier, consisting of programmable gain with seven individual
3dB steps.
The overall gain control of the DAC is controlled by the a VM function and this setting is a combined function of
the digital and analogue amplifier settings, therefore for a 1V rms nominal digital output signal from the digital
gain stage of the DAC, the following approximate output values of the analogue amplifier of the DAC can be
expected:
Analogue Gain Setting
+3dB
0dB
-3dB
-6dB
-9dB
-12dB
-15dB
-18dB
Output Voltage
1.40V
1.00V
0.72V
0.50V
0.36V
0.25V
0.18V
0.13V
Table 8.4: DAC Analogue Gain Settings
8.8.8 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 auxilliary mono channel that may be
used in dual mono channel operation. See Section 8.8 for an important note on stereo and mono definitions.
BC352239A-ds-001Pc
© Cambridge Silicon Radio Limited 2004
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