MX651P 데이터 시트보기 (PDF) - MX-COM Inc
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MX651P Datasheet PDF : 13 Pages
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Telephone SPM and Anti Fraud Tone Processor
4
2. Signal List
MX651 - PRELIMINARY INFORMATION
Pin No.
1
2
4
5
6
7
8
9
10
11
12
13
14
16
3, 15
Signal
XTAL
XTAL
CLKIN
RX / TX
NRZ DATA
TXOUT
VSS
VBIAS
AMPOUT
NEGIN
POSIN
DETECT 18kHz
DETECT 12kHz
VDD
N/C
Type
input
output
input
input
input
output
power
output
output
input
input
output
output
power
Description
Input to the on-chip oscillator inverter.
Inverted output of the on-chip oscillator.
A logic input which may be used when an external clock signal is available in
place of a crystal. The external 3.579545MHz signal is applied to this pin and
XTAL is tied to VDD. When not used, this pin should be tied to VDD.
A logic input which controls the operating mode of the device. In Rx, the
device detects the presence of 12kHz and 18kHz tones. In Tx, the18kHz
detect function is disabled and 18kHz is transmitted from the TXOUT pin
modulated ON -OFF by the NRZ Data pin.
A logic input used in Tx mode to ASK modulate the TXOUT pin. A logic high
corresponds to no tone and logic low corresponds to 18kHz.
The Tx mode output. It is ASK modulated by the NRZ data input pin. It
transmits 18kHz or no tone depending upon the state of the NRZ data input
pin. This pin goes to a high impedance state when in Rx mode.
Negative supply.
A bias line for the internal circuitry, held at VDD/2 It also forms the analog
ground for the input differential amplifier. This pin must be bypassed by a
capacitor mounted close to the device pins (see Figure 1).
Output of the input amplifier. External components are used in conjunction
with the amplifier to couple the line signal into the device. Both inputs are
available to allow a differential configuration because a two wire input is
assumed.
Inverting input to the input amplifier.
Non-inverting input to the input amplifier.
Logic output of the 18kHz channel. Logic 0 when a 18kHz tone (within
specified frequency and amplitude limits) has been detected for a minimum
length of time.
Logic output of the 12kHz channel. Logic 0 when a 12kHz tone (within
specified frequency and amplitude limits) has been detected for a minimum
length of time.
Positive Supply. Levels and voltages are dependent upon this supply. This
pin should be bypassed to VSS by a capacitor (see Figure 1).
No internal connection: leave open circuit.
© 1997 MX•COM Inc.
www.mxcom.com Tele: 800 638-5577 910 744-5050 Fax: 910 744-5054
Doc. # 20480137.003
4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA All trademarks and service marks are held by their respective companies.
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