sm8220 Nippon Precision Circuits Inc, (NPC), sm8220 Datasheet - Page 3

• Manufacturer Part Number: sm8220
• Description: Calling Number Identification Receiver Ic
• Manufacturer: Nippon Precision Circuits Inc, (NPC)

PIN DESCRIPTIONS
SM8220
10
11
12
13
14
15
16
1
2
3
4
5
6
7
8
9
Number
SM8221
1
2
3
4
5
6
7
8
-
-
-
-
-
-
-
-
OSCOUT
/CLKIN
PDWN
OSCIN
DOUT
AGND
RDRC
CDET
DMIN
FOUT
RDET
RING
RDIN
Name
GND
VDD
TIP
NC
i/o
od
si
si
o
o
o
o
o
o
-
-
-
i
i
i
i
Tip Input: This pin is connected to the tip side of the twisted pair telephone wires.
This pin must be DC isolated from the phone line.
Ring Input: This pin is connected to the ring side of the twisted pair telephone wires.
This pin must be DC isolated from the phone line.
Analog Ground: 1/2 V
Ring Detect Input: The attenuated ring signal is connected to this pin for the ring detection.
Ring Detect RC Terminal: An RC network will be connected to this pin to set time delays for
the ring signal detection.
Ring Detect Output: This pin is an output of a schmitt trigger buffer which input is connected
to RDRC pin. The low level at this pin indicates that the ring signal is detected.
Power Down Control: This pin must be kept at low level for the normal operation.
When it is high, the device will be in the power down.
Under the power down mode, OSCOUT, CDET and DOUT pins are set to high level and
AGND, FOUT pins are set to high impedance.
Device Ground: This pin is connected to the system ground.
Crystal Oscillator Input: A crystal will be connected between this pin and OSCOUT pin.
This pin may be driven from an external clock source.
Crystal Oscillator Output: A crystal will be connected between this pin and OSCIN pin.
This pin must be kept open when OSCIN pin is driven from an external clock source.
Carrier Detect Output: When low, this output indicates that a valid carrier present on the line.
No connection pin.
Data Out: This pin presents the output of the demodulator while CDET pin is low.
When CDET pin goes high, this pin is held high.
Demodulator Input: This pin is connected from FOUT pin through a 0.1µF capacitor.
No other components should be connected to this pin.
Band Pass Filter Output: This pin is connected to DMIN pin through a 0.1µF capacitor.
No other components should be connected to this pin.
Power Supply: Positive power supply pin.
DISCONTINUED
SM8220/SM8221
PRODUCT
DD
voltage output. This pin must be grounded through 0.1 µF capacitor.
(Note) si: Schmitt Triger Input, od: Open Drain Output.
Function
NIPPON PRECISION CIRCUITS-3