U4091BM-R datasheet(25/38 Pages) ATMEL

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4872A–CORD–08/05

U4091BM-R

14. Switch Matrix

The switch matrix has 5 inputs and 5 outputs. Every pair of I/Os except AGCO and AGCIN can

be connected. The inputs and outputs used must be enabled. If 2 or more inputs are switched to

an output, the sum of the inputs is available at the output.

The inputs MIC and LRX have offset cancellers with a 3-dB corner frequency of 270Hz. AMPB

has a 60-k

Ω input impedance. The TXO output has a digitally-programmable gain stage with a

gain of 2 dB to 9 dB (in 1 dB steps) depending on AGATX0 (LSB), AGATX1, AGATX2 (MSB),

and a first order low-pass filter with 0.5 dB damping at 3300Hz and 3 dB damping at 9450Hz.

The outputs RXLS, EPO and AMREC have a gain of 0 dB. The offset at the outputs of the matrix

is less than 30 mV. If a switch is open, the path has a damping of more than 60 dB.

Figure 14-1. Switch Matrix Diagram

Low pass

2.9 dB

Offset

cancel

AGATX1

AMREC EPO RXLS

LTX

AGATX2

AGATX0

TXO

-10 dB

STO

Offset

cancel

AMPB

LRX

DTMF

MIC

AGCO

AGCI

AGC

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