FX621P Consumer Microcircuits Limited, FX621P Datasheet

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FX621P

Manufacturer Part Number
FX621P
Description
Low-power subscriber private metering (SRM) detector
Manufacturer
Consumer Microcircuits Limited
Datasheet
Features/Applications
Brief Description
The FX621 is a single-chip, low-power CMOS tone
detector designed for use in both PABX and general
payphone applications for Subscriber Private Metering.
The Decode and Not-Decode band edges are
accurately defined by the use of an external
4.433619MHz crystal.
Operation to either of the 12kHz or 16kHz SPM
systems is pin programmable, with system amplitude
sensitivities and pulse-length timing being provided by
the use of external components.
Fig.1 Internal Block Diagram
V
V
V
DETECTOR
INPUT
AMP
INPUT ( – )
AMP
INPUT (+)
AMP OUTPUT
(GAIN SET)
DD
SS
BIAS
Meets 12kHz and 16kHz SPM
Specifications
Low-Power CMOS [ 3.5 – 5 Volt
Operation ]
Tone Follower and SPM Packet
Detection Modes
+
DETECTOR
LEVEL
"SYSTEM GAIN SET"
AMPLIFIER
PRODUCT INFORMATION
FX621
CML Semiconductor Products
XTAL
4.433619 MHz
OSCILLATOR
FREQUENCY
DETECTOR
WINDOW
3
or 4
2
1
1
4.433619 MHz
FREQUENCY DIVIDERS
554.203 kHz
738.937 kHz
XTAL/CLOCK
or
Low-Power Subscriber Private
Metering (SPM) Detector
1) Tone Follower Mode.
2) SPM Packet Mode .
The FX621 has 2 pin-selectable modes of operation:
A logic “0” is output whenever a tone of the correct
frequency and length is detected.
An output is obtained only when both the mark and
space timing criteria of an input SPM tone have been
fulfilled.
The FX621, which is available in plastic DIL and SMD
packages, requires only a single 3.5-volt (min.) power
supply, a 4.433619MHz crystal with external gain and
timing components to meet most SPM specifications.
Adjustable Input Gain
PABX, Payphone and Telephone
Applications
General-Purpose Tone Detection
Crystal Oscillator Stability
PULSE
LENGTH
TIME
SYSTEM SELECT 12/16 kHz
OUTPUT LOGIC
COUNTERS
AND
OUTPUT RESET
SPACE
LENGTH
TIME
MODE SELECT
Publication D/621/2 June 1991
OUTPUT
FX621
Provisional Issue

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FX621P Summary of contents

Page 1

Features/Applications Meets 12kHz and 16kHz SPM Specifications Low-Power CMOS [ 3.5 – 5 Volt Operation ] Tone Follower and SPM Packet Detection Modes BIAS AMP "SYSTEM GAIN SET" INPUT ( – ) AMPLIFIER – + ...

Page 2

... Pin Number Function DIL Quad FX621P FX621LG/ Xtal/Clock: Input to the clock oscillator inverter. A single 4.433619MHz Xtal or external clock pulse input is required (see Figure 2 The positive supply rail. A single, stable supply in the range 3. required Detector Input: “Schmitt Trigger” level detector circuitry whose input thresholds are set internally and dependent on the applied V should be preceded by the “ ...

Page 3

... Attenuation for the levels in Note 2, using the “System Gain Set” amplifier. The gain requirement is calculated as : [Max] / {Min} Gain = Device Sensitivity { Minimum Will-Decode Level } [or] [ Maximum Will-Not Decode Level ] Choose a gain figure that meets both level requirements XTAL/CLOCK 1 V BIAS DETECTOR INPUT 3 AMP INPUT (+) 4 FX621P AMP INPUT (-) AMP OUTPUT BIAS Reference C Note ...

Page 4

Application Information (5) Timing Components In the ‘SPM Packet’ mode R and 'Tone' period ( and C set the minimum 'Space period (t ), and are calculated as follows ...

Page 5

... SS Sink/source current (supply pins) (other pins) Total device dissipation @ AMB Derating Operating temperature range: FX621P/LG/LS Storage temperature range: FX621P/LG/LS Operating Limits All device characteristics are measured under the following conditions unless otherwise specified : AMB Characteristics Static Values Supply Voltage (V ...

Page 6

... Section 10 of this document. Pin 1 identification marking is shown on the relevant diagram and pins on all package styles number anti-clockwise when viewed from the top. FX621P 16-pin DIL Package NOT TO SCALE Max. Body Length Max. Body Width Ordering Information FX621P ...

Page 7

... CML Microcircuits Product Prefix Codes Until the latter part of 1996, the differentiator between products manufactured and sold from MXCOM, Inc. and Consumer Microcircuits Limited were denoted by the prefixes MX and FX respectively. These products use the same silicon etc. and today still carry the same prefixes. ...

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