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參數(shù)資料
| 型號： | 78A207 |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | MFR1 Receiver |
| 中文描述： | MFR1接收機 |
| 文件頁數(shù)： | 1/8頁 |
| 文件大?。?/td> | 68K |
| 代理商： | 78A207 |
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
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.
component required is an inexpensive television
“color burst” 3.58 MHz crystal.
The outputs interface directly with standard CMOS
or TTL circuitry and are three-state enabled to
facilitate bus-oriented architecture.
bandpass
filters,
an
The
only
external
FEATURES
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 “n of 6” or hexadecimal code
Three-state outputs, CMOS-compatible and
TTL-compatible
BLOCK DIAGRAM
PRE-FILTER
ZERO
CROSSING
DETECTORS
VIN
BANDPASS
FILTER
THRESHOLD
DETECTOR
TONE DETECTOR
VOLTAGE
REF
V
A
D
CSTR
DV
DE
LKP
HEX
D5
D4
D3
D2
D1
D0
EN
X1
X2
CHIP CLOCKS
XOUT
CLOCK
GENERATOR
VOLTAGE DIVIDER
700
700
1500
1700
900
1100
1300
900
1100
1300
1500
1700
R
S
Q
R
S
Q
QUAL
LOGIC
QUAL
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| 78A207-CP | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:MFR1 Receiver |
| 78A-435A | 制造商:CML Innovative Technologies 功能描述: |
| 78A-435G | 制造商:CML Innovative Technologies 功能描述: |
| 78A-435R | 制造商:CML Innovative Technologies 功能描述: |
| 78ACSX-4 | 制造商:Magnecraft 功能描述: |
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