U4091BM-R datasheet(28/38 Pages) ATMEL

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4872A–CORD–08/05

U4091BM-R

The 3 programmable parameters are

LF (gain at low frequency)

LF has 15 programming steps of 0.5 dB

LF(0) provides –2 dB gain, LF(15) provides 5.5 dB gain

STO_DIFF(LF) = (–10 dB – 2 dB + 0.5 dB

× LF + 9 dB) × LTX

P (the pole position of the low-pass)

The P adjustment has 31 steps. P(0) means the lowpass determined by the external

application (RST, CST). The internally processed low-pass frequency is fixed by the fol-

lowing equation.

SL (sidetone slope; the pole frequency of the high-pass)

The SL has 3 steps. SL(0) is a lower frequency of the high-pass. SL(3) is a higher fre-

quency of the high-pass. SL can be used to influence the suppression at high

frequencies.

Figure 15-2. Audio Frequency Signal Management U4091BM-R

f(P)

CST

RST

----------------------------------------------------

1.122

Sidetone

balancing

DTMF

generator

Offset

cancel

Filter

< -24 dBm/

-22 dBm >

Offset

cancel

0 dB

MIC3

Handset

micro-

phone

Intercom

micro-

phone

0 dB

AMPB

Answering

machine

Line

LRX

DTMF

MIC

AMPB

0 dB

AGCO

RXLS

EPO

Offset

cancel

DTMF

30 dB --> 12 dB

7 dB --> -48 dB

6 dB steps

1 dB steps

7 dB --> 0 dB and

20 dB (NWT)

32 dB --> -23dB

-10 dB

-3 dB to -10 dB and 7 dB (NWT)

1.5dB steps

26 dB --> -3 dB and

-10 dB (DTMF)

9 dB --> 2 dB

1 dB steps

LTX

0 dB

AMREC

AGCI

6 dB

MIC1

MIC2

SAO1

SAO2

8 dB

RECO1

RECO2

MOD

AMREC

AGC

DTMF

< -34 dBm/

-32 dBm >

Earpiece

Loud-

speaker

Line

Answering

machine

1 dB steps

Switching

matrix

-->

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