W91031S Winbond Electronics, W91031S Datasheet - Page 22
W91031S
Manufacturer Part Number
W91031S
Description
Manufacturer
Winbond Electronics
Datasheet
1.W91031S.pdf
(29 pages)
Specifications of W91031S
Process Technology
CMOS
Operating Frequency (max)
3580kHz
Mounting
Surface Mount
Supply Current
2.5mA
Lead Free Status / Rohs Status
Not Compliant
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Part Number:
W91031SG
Manufacturer:
WINBOND/华邦
Quantity:
20 000
APPLICATION INFORMATION
Application Circuit
The application circuit of the W91031 in Figure 9-1 shows the device being used within a typical CPE
system. Note that only the circuit between the W91031 and the line interface is shown. The gain
control op-amp is set to unity gain to allow the electrical characteristics to be met in this application
circuit. It should also be noted that if a glitch with sufficient amplitude appears on the tip and ring
interface, this will be detected as a ringing input by this circuit.
Another application circuit for the W91031, which provides common mode rejection of ringing circuit
signals, is shown in Figure 9-2. When the AC voltage between the tip and ring is greater than the
zener diode breakdown voltage, the photo-coupler LED will turn on, driving RNGDI high and thus
detecting a ringing signal. Note however in this case, a glitch on the tip and ring interface is not able
to turn on the photo-coupler and therefore will not be detected as a ringing signal.
Tip/A
Ring/B
Crystal is 3.579545MHz with 0.1% frequency tolerance.
0.1uF
0.1uF
22nF
22nF
Resistor must have 1% tolerance.
Resistor may have 5% tolerance.
470K
430K
430K
470K
V
V
DD
DD
34K
34K
V
DD
200K
300K
53K6
Figure 9-1. Application Circuit.
0.1 uF
60K4
V
DD
150K
0.22uF
- 22 -
V
DD
464K
R1, R2 must calculated according to the formula of Figure 7-6(a)
for Bellcore or BT application.
FSK 3-wire interface Mode 0 selected.
INP
INN
GCFB
VREF
TEST1
RNGDI
RNGRC
RNGON
MODE
OSCI
OSCO
VSS
W91031
Preliminary W91031
SLEEP/
RESET
ALGRC
TEST2
ALGO
ALGR
DATA
DCLK
FCDN
FDRN
FSKE
INTN
VDD
V
DD
R1
V
Must rest by
microcontroller
or by RC pulse.
DD
0.1uF
R2
V
DD
10K