w925e625 ETC-unknow, w925e625 Datasheet - Page 62

• Manufacturer Part Number: w925e625
• Description: 8-bit Cid Microcontroller
• Manufacturer: ETC-unknow

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.
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.
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.
Alert tone hysteresis
DTMF hysteresis
FSK hysteresis
FSK detector hysteresis
X
0
1
2
3
4
5
20 log((40+15*X)/(230-(40+15*X))) Db
Ring/B
Tip/A
Ring
Tip
Network
Speech
Resistor must have 1% tolerance
Resistor must have 5% tolerance
-13.53
-10.05
-7.18
-4.64
-2.28
0.00
Tx+
Tx-
Rx+
0.1uF
0.1uF
Rx-
Microphone
Speaker
HAT=13mv + 3mv*X
HDTMF=6mv + 3mv*X
HFSK=13mv + 3mv*X
HFSKD=13mv + 3mv*X
22nF
22nF
470K
470K
Figure 6-26 Application Circuit of CID
430K
430K
22nF
22nF
464K
464K
464K
- 62 -
10
X
6
7
8
9
34K
34K
200K
60K4
53K6
X is the value of L/H nibble of PGxx
100K
60K4
20 log((40+15*X)/(230-(40+15*X))) Db
0.1uF
60K4
464K
X=PHAD<7:4>
X=PHAD<3:0>
X=PHFL<7:4>
X=PHFL<3:0>
464K
150K
0.47u
10.05
13.53
INP2
INN2
GCFB2
VREF
CAP
RNGDI
RNGRC
INP1
INN1
GCFB1
2.28
4.64
7.18
W925E/C625