BL1302A57S
Description
The BL1302A57/S is an A-law monolithic PCM Pin Assignment
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 patible 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
VBB GNDA VFRO
VCC FSR
DR BCLKR/CLKSEL
MCLKR/PDN
1 2 3 4 5 6 7 8
BL1302A57
16 VFXI+ 15 VFXI14 GSX 13 TSX 12 FS X 11 DX 10 BCLKX 9 MCLKX panding coder which samples the filtered signal and encodes it in the panded A-law PCM format.
The decode portion consists of an expanding decoder, which reconstructs the
Analog signal from the panded A-law code, a low-pass filter which corrects for the sinx/x response of the decoder output and...
