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| 型號： | U3900BM-AFNG3 |
| 英文描述： | Programmable Telephone Audio Processor |
| 中文描述： | 程控電話音頻處理器 |
| 文件頁數(shù)： | 15/34頁 |
| 文件大小： | 762K |
| 代理商： | U3900BM-AFNG3 |
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U3900BM
Rev. A2, 25-Aug-98
Target Specification
22 (34)
Table 2. Input selection AD converter
ADC[0:3]
Value
0
0000
OFF
1
0001
IL
I1 = S
127 mA
D / 127
2
0010
ADIN external
V2 = 2.5 V
D / 127 (max. 2.5 V)
3
0011
VB
V3 = (2.5 V / 0.4)
D / 127
4
0100
VMPS
V4 = (2.5 V / 0.4)
D / 127
5
0101
VMP
V5 = (2.5 V / 0.75)
D / 127
6
0110
TLDR
V6 = 1/8
(Vp – Ref)
D / 127
7
0111
TLDT
V7 = 1/8
(Vp – Ref)
D / 127
8
1000
Free
9
1001
SAO1
V4 = (2.5 V / 0.4)
D / 127
10
1010
Offcan1
TEMIC internal use
11
1011
Offcan2
TEMIC internal use
12
1100
Offcan3
TEMIC internal use
13
1101
Free
14
1110
Free
15
1111
Free
D = measured digital word (0 < = D < = 127)
S = programmable gain 0.5 or 1
Vp = peak value of the measured signal
12 Switch Matrix
The switch matrix has 5 inputs and 5 outputs. Every pair
of input and output 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 270 Hz.
AMPB and CMIC have a 60-k
W input impedance. The
TXO output has a digitally-programmable gain stage with
a gain of 2, 3 to 9 dB depending on AGATX0 (LSB),
AGATX1, AGATX2 (MSB) and a first-order low-pass
filter with 0.5 dB damping at 3300 Hz and 3 dB damping
at 9450 Hz. The outputs RXLS, EPO and CEAR have a
gain of 0 dB. If a switch is open, the path has a damping
of more than 60 dB.
Lowpass
2 ... 9 dB
Offset
canceller
AGATX1
AMREC EPO RXLS
LTX
AGATX2
AGATX0
TXO
–10 dB
STO
O1
O2
O3
O4
O5
I5
I4
I3
I2
I1
Offset
canceller
CMIC LRX DTMF MIC
AMPB
AGCI
AGC
14079
Figure 25. Diagram of switch matrix
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