BL1302A57The BL1302A57 S is an A-law monolithic PCM
CODEC Filter which has the A/D and D/A
conversion and a serial PCM Interface The device is
fabricated using the advanced double-poly nwell
CMOS process. It is pin compatible with TP3057.
The encode portion of each device consists of an
input gain adjust Amplifier an active RC pre-filter
which eliminates very high frequency noise prior to
entering a switched-capacitor band-pass Filter that
rejects signals below 200 Hz and above 3400 Hz.
Also included are auto-zero circuitry and a
companding coder which samples the filtered signal
and encodes it in the companded A-law PCM format.
The decode portion consists of an expanding
decoder, which reconstructs the By Shanghai Belling Co, Ltd
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