MB86435 Просмотр технического описания (PDF) - Fujitsu

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MB86435

3 V Single Power Supply Audio Interface Unit (AIU)

Fujitsu 

MB86435

(6) Codec Input/Output

Both the µ-law and A-law coding/decoding conversion processes used by the MB86435 codec are compatible with

CCITT Recommendation G.711. In addition, linear coding in the form of 14-bit two's complement code can be output

starting with MSB values.

SYNC

Din, Dout

MSB

12

11

10

1

LSB

MSB

Code

LSB

01 11111 111111111

to

00 00000 000000001

00 00000 000000000

11 11111 111111111

to

10 00000 000000001

PTBO reference voltage (V)

0.7354

to

1.4991

1.5000

1.5009

to

2.2647

(7) The Codec SYNC Pin

The codec block requires the input of an 8 kHz sampling clock signal at the SYNC pin, as well as a data transfer

clock at the CLK pin. In order to conserve power consumption, whenever the SYNC pin or CLK pin signal is inactive,

the system goes into SYNC power-down mode and stops code conversion.

Also, if either the SYNC or CLK pins encounters jitter of 5 µs or greater, the system may go into power-down

mode.Table 1.10 shows the status of output pins in SYNC power-down mode.

Pin symbol

SGC

SGO

VRH

DOUT

PTBO

BTPO

Operation

Normal operation (1.5 V)

Normal operation (1.5 V)

Normal operation (2.5 V)

H-level fixed

SGC

High impedance

15

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