W91031S Winbond Electronics, W91031S Datasheet - Page 22

• Manufacturer Part Number: W91031S
• Manufacturer: Winbond Electronics

Specifications of W91031S

• Process Technology: CMOS
• Operating Frequency (max): 3580kHz
• Mounting: Surface Mount
• Supply Current: 2.5mA
• Lead Free Status / Rohs Status: Not Compliant

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