U3500BM Просмотр технического описания (PDF) - Temic Semiconductors

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U3500BM

Cordless Telephone Signal Processor

Temic Semiconductors 

U3500BM

Gain stage

F–3 dB=3.35 kHz

DATA

F–3 dB=3.95 kHz

Output buffer

Demo–

dulator

F–3 dB=90 Hz

RGAIN

ADJ

Signal: 4.1 kHz/DC/OFF

State : SCRON/SCROFF/DATA

Gain : –4 dB/0 dB/OFF

F–3 dB=3.95 kHz

Signal: 1 kHz

State : SCRON/SCROFF

Gain : 5.9 dB/1.9 dB

F–3 dB=3.35 kHz

Deemphasis

DATA

Signal: 4.1 kHz/DC/OFF

State : DESCRON/DESCROFF/DATA

Gain : –4 dB/0 dB/OFF

F–3 dB=1 kHz

Comparator

Figure 11.

Signal: 1 kHz

State : DESCRON/DESCROFF

Gain : –0.5 dB/–4.5 dB

11786

Serial Bus Interface

The circuit is remoted by an external microcontroller

through the serial bus (programming can be started 10 ms

after power supply settled).

The data is an 12-bit word:

A3 – A0: address of the destination register (0 to 15)

D7 – D0: contents of register

The data line must be stable when the clock is high and

data must be serially shifted.

After 12 clock periods, the transfer to the destination reg-

ister is (internally) generated by a low-to-high transition

of the data line when the clock is high.

Micro-

processor

Data

Clock

Figure 12.

D

C

96 11787

Rev. A3, 20-May-98

Preliminary Information

11 (17)

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