MAS9090B datasheet(25/30 Pages) MICRONAS

25 / 30 page

DA9090B.001

January 14, 1998

Control Register CR4

Transmit Input Selection

Bits VS (7) and TE (6) select active input (MIC1,

MIC2 or MIC3). Default is that all inputs are muted.

Transmit (TX) gain can be adjusted from 0 to 22.5

dB in 1.5 dB steps with register CR5 bits (7:4).

Sidetone Selection

Transmit signal after bandpass filter can be fed

back to the receive amplifiers when bit SI (5) is set

high.

Output Driver Selection

Bits OE1 (4) and OE2 (3) select the active output of

the RX gain to be SP1 or SP2. Both outputs can be

muted.

Ring/Tone Signal Selection

Bit RTE (2) connects the on-chip Ring/Tone

generator to the RX gain input.

Receive High Pass Filter Selection

Bit HPR (1) provides possibility to bypass high pass

section of the receive bandpass filter.

PCM receive data selection

Bit SE (0) enables the connection of the received

signal to the RX gain input.

Control Register CR5

Transmit Gain Selection

TX gain can be programmed from 0 to 22.5 dB in

1.5 dB steps with bits (7:4).

Sidetone Attenuation Selection

Transmit signal picked after digital bandpass filters

can be fed back to RX gain. Attenuation of the

sidetone signal can be programmed from –12.5 dB

to –27.5 dB in 1 dB steps with bits (7:4). Attenuation

is relative to the input signal level of bandpass filter.

Control Register CR6

Speaker 1 and 2 Gain Selection

The attenuation of both speaker gains can be

programmed separately from 0 to –30 dB in 2 dB

steps with bits (7:4) and (3:0).

0 dBm0 voltage at the output of the RX gain on pins

SP1/2+ and SP1/2- is 1.965 Vrms when 0 dB gain is

selected.

When –30 dB gain is selected the

0 dBm0 level is 61.85 mVrms.

Control Register CR7

Tone/Ring Gain Selection

Output of Tone/Ring generator can be attenuated

from 0 to –27 dB in 3 dB steps with bits (7:4).

Frequency Mode Selection

Bits f1 (3) and f2 (2) permit selection of f1 and/or f2

frequency generators. When f1 (f2) is selected the

output of the tone generator is signal at the

frequency programmed by the register CR8 (CR9).

If both f1 and f2 are selected the output is a sum of

both signals. In case of squarewave the f1 is

amplitude modulated by f2. In order to meet DTMF

specifications the level of f2 is attenuated by 2 dB

relative to f1.

Waveform Selection

Bit SN (1) selects the output waveform of the tone

generator to be square (SN=0) or sinewave (SN=1).

DTMF Selection

Bit DE (0) permits the connection of the tone

generator to the transmit path. Speaker output can

also be provided by using sidetone circuit (bit SI of

CR4) or directly connecting the tone generator to

RX gain with bit RTE of CR4.

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