U4091BM-RFNY19 Atmel, U4091BM-RFNY19 Datasheet - Page 26

• Manufacturer Part Number: U4091BM-RFNY19
• Description: RF Wireless Misc COM.CORDED - FEATURE PHONE CIRCUIT
• Manufacturer: Atmel
• Type: Programmable Telephone Audio Processorr

Specifications of U4091BM-RFNY19

• Operating Frequency: 100 KHz
• Operating Temperature Range: - 55 C to +150 C
• Package / Case: SSO-44
• Mounting Style: SMD/SMT

14. Switch Matrix
26
Atmel U4091BM-R
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-kΩ input impedance. The TXO output has a digitally-programmable gain stage with a
gain of 2dB to 9dB (in 1dB steps) depending on AGATX0 (LSB), AGATX1, AGATX2 (MSB),
and a first order low-pass filter with 0.5dB damping at 3300Hz and 3dB damping at 9450Hz.
The outputs RXLS, EPO and AMREC have a gain of 0dB. The offset at the outputs of the
matrix is less than 30mV. If a switch is open, the path has a damping of more than 60dB.
Figure 14-1. Switch Matrix Diagram
AGC
AGCO
AGCI
O5
I5
AMREC EPO RXLS
O4
AMPB LRX DTMF MIC
I4
O3
Offset
cancel
I3
O2
I2
LTX
STO
Low pass
O1
2.9 dB
Offset
cancel
I1
-10 dB
AGATX0
AGATX1
AGATX2
TXO
4872B–CORD–01/11