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78A207

MFR1 Receiver

April 2000

DESCRIPTION

The 78A207 is a single-chip, Multi-Frequency (MF)

receiver that can detect all 15 tone-pairs, including

ST and KP framing tones. This receiver is intended

for use in equal access applications and thus meets

both Bell and CCITT R1 central office register

signaling specifications.

The 78A207 employs state-of-the-art switched

capacitor filters in CMOS technology. The receiver

consists of a bank of channel-separation bandpass

filters followed by zero-crossing detectors and

frequency-measurement

bandpass

filters,

an

amplitude check circuit, a timer and decoder circuit,

and a clock generator. The device does not attempt

to identify strings of digits by the KP (key pulse) and

ST (stop) tone pairs.

No anti-alias filtering is needed if the input signal is

band-limited to 26 KHz. The only external

component required is an inexpensive television

鈥渃olor burst鈥?3.58 MHz crystal.

The outputs interface directly with standard CMOS

or TTL circuitry and are three-state enabled to

facilitate bus-oriented architecture.

FEATURES

鈥?/div>

Meets Bell and CCITT R1 specifications

20-pin plastic DIP

Single low-tolerance 5V supply

Detects all 15 tone-pairs including ST and KP

Long KP capability

Built-in amplitude discrimination

Excellent noise tolerance

Outputs in either 鈥渘 of 6鈥?or hexadecimal code

Three-state outputs, CMOS-compatible and

TTL-compatible

BLOCK DIAGRAM

700

VIN

900

700

THRESHOLD

DETECTOR

QUAL

LOGIC

R

Q

S

CSTR

DV

900

R

1100

S

Q

DE

1300

LKP

1500

HEX

QUAL

1700

PRE-FILTER

X1

ZERO

CROSSING

DETECTORS

1700

BANDPASS

FILTER

D5

D4

D3

D2

X2

CLOCK

GENERATOR

CHIP CLOCKS

D1

D0

XOUT

VOLTAGE DIVIDER

VOLTAGE

REF

TONE DETECTOR

EN

AGN

VDD

DGND

型號

版本

描述

廠商

下載
78A207

英文版

MFR1 Receiver

ETC

78A207
78A207

英文版

MFR1 Receiver

ETC [ETC]

78A207
78A207-CP

英文版

MFR1 Receiver

ETC

78A207-CP
78A207-CP

英文版

MFR1 Receiver

ETC [ETC]

78A207-CP

78A207 Datasheet

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78A207 Datasheet

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