W925E625 Datasheet, PDF (62/75 Pages) Winbond – 8-bit CID MICROCONTROLLER

W925E/C625
There are 4 programmable gain arrays, shown in Figure 6-17, are determined by Low/High nibbles of
PGxx. The following table lists the input gain corresponding to the value of L/H nibble of PGxx.
X
20 log((40+15*X)/(230-(40+15*X))) Db X
20 log((40+15*X)/(230-(40+15*X))) Db
0
-13.53
6
2.28
1
-10.05
7
4.64
2
-7.18
8
7.18
3
-4.64
9
10.05
4
-2.28
10
13.53
5
0.00
X is the value of L/H nibble of PGxx
There are 4 programmable hysteresis input buffer, shown in Figure 6-17, are determined by Low/ High
nibbles of PHxx. The hysteresis control formulas are list below.
Alert tone hysteresis
DTMF hysteresis
FSK hysteresis
FSK detector hysteresis
HAT=13mv + 3mv*X
HDTMF=6mv + 3mv*X
HFSK=13mv + 3mv*X
HFSKD=13mv + 3mv*X
X=PHAD<7:4>
X=PHAD<3:0>
X=PHFL<7:4>
X=PHFL<3:0>
Application Circuit
The analog interface circuit of W925E/C625 shown in Figure 6-26 is a typical CPE system. The gain
control op-amp is set to unit gain to allow the electrical characteristics to be met in this application
circuit.
Tip/A
22nF 430K
34K
Ring/B
22nF 430K
0.1uF 470K
34K
53K6
464K
60K4
0.1uF
200K
150K
0.1uF 470K
Tip
Ring
Microphone
Tx+
Speech^Tx-
Network
Rx+
Rx-
Speaker
464K
464K
22nF
464K
22nF
Resistor must have 1% tolerance
Resistor must have 5% tolerance
100K
60K4
60K4
0.47u
464K
INP2
INN2
GCFB2
VREF
CAP
RNGDI
RNGRC
INP1
INN1
GCFB1
Figure 6-26 Application Circuit of CID
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