U4091BM Datasheet, PDF (17/29 Pages) TEMIC Semiconductors – Programmable Telephone Audio Processor

U4091BM
Switch Matrix
The switch matrix has 5 inputs and 5 outputs. Every pair Table 3. Table of bits and corresponding switches
of input and output except AGCO and AGCIN can be
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ^{connected. The inputs and outputs used must be enabled.}
If 2 or more inputs are switched to an output, the sum of
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ _{the inputs is available at the output.}
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ _{The inputs MIC and LRX have offset cancellers with a}
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ _{W 3-dB corner frequency of 270 Hz. AMPB has a 60-k}
input impedance. The TXO output has a digitally-
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ _{programmable gain stage with a gain of 2, 3 to 9 dB}
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ _{depending on AGATX0 (LSB), AGATX1, AGATX2}
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ _{(MSB) and a first order low-pass filter with 0.5 dB}
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ^{damping at 3300 Hz and 3 dB damping at 9450 Hz. The}
outputs RXLS, EPO and AMREC have a gain of 0 dB.
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ _{The offset at the outputs of the matrix is less than 30 mV.}
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ _{If a switch is open, the path has a damping of more than}
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ^{60 dB.}
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ _{AGCO AMPB LRX DTMF MIC}
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ _Offset
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ _canceller
Offset
canceller
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ _{I5 I4 I3 I2 I1}
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ _AGC
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ _Lowpass
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ _{O5 O4 O3 O2 O1}
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ _AGATX0
Register No. Name
Description
R2
R2B0 I1O1 Switch on MIC / LTX
R2B1 I1O2 Switch on MIC / RXLS
R2B2 I1O3 Switch on MIC / EPO
R2B3 I1O4 Switch on MIC / AMREC
R2B4 I1O5 Switch on MIC / AGCI
R2B5 I2O1 Switch on DTMF / LTX
R2B6 I2O2 Switch on DTMF / RXLS
R2B7 I2O3 Switch on DTMF / EPO
R3
R3B0 I2O4 Switch on DTMF / AMREC
R3B1 I2O5 Switch on DTMF / AGCI
R3B2 I3O1 Switch on LRX / LTX
R3B3 I3O2 Switch on LRX / RXLS
R3B4 I3O3 Switch on LRX / EPO
R3B5 I3O4 Switch on LRX / AMREC
R3B6 I3O5 Switch on LRX / AGCI
R3B7 I4O1 Switch on AMPB / LTX
R4
R4B0 I4O2 Switch on AMPB / RXLS
R4B1 I4O3 Switch on AMPB / EPO
R4B2 I4O4 Switch on AMPB / AMREC
R4B3 I4O5 Switch on AMPB / AGCI
R4B4 I5O1 Switch on AGCO / LTX
R4B5 I5O2 Switch on AGCO / RXLS
R4B6 I5O3 Switch on AGCO / EPO
R4B7 I5O4 Switch on AGCO / AMREC
2.9 dB AGATX1
AGATX2
LTX
AGCI AMREC EPO RXLS
TXO
–10 dB
STO
Figure 18. Diagram for switch matrix
14596
Rev. A1, 02-Jun-98
Target Specification
17 (29)