UPD9611 Datasheet, PDF (8/28 Pages) NEC – FOUR-CHANNEL PCM CODEC

µPD9611
(3) A-law/µ-law control
The µPD9611 has the following two methods for A-law/µ-law control.
• Sets LAW pin to high or low level.
• Inputs 8-bit setting data from SPDATA pin (see (5) Control of SPDATA pin).
Internal data is the logical sum of LAW pin state and 8-bit setting data input.
If the internal data is 0, the µPD9611 enters A-law mode. If the internal data is 1, the µPD9611 enters
µ-law mode.
8-Bit Setting Data
0
1
0
1
LAW Pin
0
0
1
1
Remark 0: A-law, 1: µ-law
Internal Data
0
1
1
1
(4) Gain Setting control for transmit/receive
The µPD9611 can control gain settings independently for the transmit/receive by inputting 8-bit setting
data (see (5) Control of SPDATA pin) from the SPDATA pin for four channels. Gain can be set from +7.5
to –8.0 dB for the transmit and +0.0 dB t o –15.5 dB for the receive in 0.5 dB steps.
8-bit setting data input from SPDATA pin specifies the channel set in the first 8 bits, and performs selection
of transmit/receive and gain setting in the second 8 bits.
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