Product Info

VTech proprietary and confidential
VTech Communications LTD.
R&D Department
The document is VTech’s proprietary information, Please do not disclose to third party without VTech’s consent
Ref. No.: 20191009 Version: 01 Date: 09 Oct, 2019 Page 12 of 33
independent sample rate.
Figure 7-1 VTBM-01 BT Module audio interface
7.1 Audio input and output
The audio input circuitry consists of 2 independent 16-bit high-quality ADC channels:
• Programmable as either stereo or dual-mono inputs.
• 1 input programmable as either microphone or line input, the other as line input only.
• Each channel can be connected as either single-ended or fully differential.
• Each channel has an analog and digital programmable gain stage.
The audio output circuitry consists of a dual differential class A-B output stage.
NOTE VTBM-A01 BT module is designed for a differential audio output. If a single-ended audio output
is required, use an external differential to single-ended converter.
7.2 Audio codec interface
The interface has the following features:
• Stereo and mono analog input for voice band and audio band
• Stereo and mono analog output for voice band and audio band
NOTE To avoid any confusion regarding stereo operation, this data sheet explicitly states which is the left
and right channel for audio output. Regarding audio input, software, and any registers, channel 0 or channel A