FX641(1997) データシートの表示（PDF） - CML Microsystems Plc
部品番号
コンポーネント説明
一致するリスト
FX641 Datasheet PDF : 12 Pages
| |||
CML Semiconductor Products
PRODUCT INFORMATION
FX641 Dual Subscriber Private
Metering (SPM) Detector
Features
Publication D/641/3 November 1997
Provisional Issue
Two (12kHz/16kHz) SPM
Detectors on a Single Chip
Selectable Tone Follower or
Packet Mode Outputs
Detects 12kHz and 16kHz SPM
Frequencies
High Speech-Band Rejection
Properties
Xtal Accuracy; Stable Frequency
Limits
“Output Enable” Multiplexing
Facility
“Controlled” (µC) and “Fixed”
Signal Sensitivity Modes
Call-Charge Applications on
PABX Line Cards
XTAL/CLOCK
XTAL
Ch 1 AMP OUT
Ch1 AMP IN (-) -
+
Ch1 AMP IN (+)
Ch 1
INPUT
AMPLIFIER
PRESET LEVEL
CHIP SELECT
SERIAL
DATA
SERIAL
CLOCK
SERIAL
INPUT
LOGIC
XTAL/CLOCK
GENERATOR
CLOCK OUT
BUFFER
CLOCK IN
CLOCK
DIVIDERS
INTERNAL
CLOCKS
VDD
VBIAS
VSS
Ch 1
BANDPASS
FILTER
Ch 1
COMPARATOR
-
+
GAIN
ADJUST
INTERNAL
COMPARATOR
THRESHOLD
12kHz/16kHz
SYSTEM
PULSE
GENERATOR
AND
DIVIDER
PULSE
MEASUREMENT
LOGIC
CHANNEL 1
TONE FOLLOWER
MODE
Ch 1
OUTPUT
PULSE
LENGTH
LOGIC
OUTPUT
SELECT
CIRCUITS
PACKET
MODE
OUTPUT
ENABLE
LEVEL/
SYSTEM
SETTING
12kHz/16kHz
SYSTEM
12kHz/16kHz
SYSTEM
OUTPUT
SELECT
SYSTEM SELECT
Ch2 AMP IN (-)
Ch 2
INPUT
AMPLIFIER
-
+
Ch2 AMP IN (+)
Ch 2 AMP OUT
GAIN
ADJUST
INTERNAL
COMPARATOR
THRESHOLD
Ch 2
+
BANDPASS
FILTER
-
Ch 2
COMPARATOR
Fig.1 Functional Block Diagram
CHANNEL 2
PULSE
GENERATOR
AND
DIVIDER
PULSE
MEASUREMENT
LOGIC
PACKET
MODE
PULSE
LENGTH
LOGIC
OUTPUT
SELECT
CIRCUITS
TONE FOLLOWER
MODE
Ch 2
OUTPUT
FX641
Brief Description
The FX641 is a low-power, system-selectable Dual
Subscriber Private Metering (SPM) Detector -two
detectors on a single chip- to indicate the presence,
on a telephone line, of either 12kHz or 16kHz
telephone call-charge frequencies.
Under µProcessor control via a common serial
interface, each channel of the FX641 will detect
call-charge pulses from a telephone line and provide a
digital output for recording, billing or security
purposes.
A common set of external components and a stable
3.579545MHz Xtal/clock input ensures that the FX641
adheres accurately to most national “Must and Must-
Not” decode band-edges and threshold levels.
The digital output is pin-selectable to one of three
modes:
(1) Tone Follower mode -a logic level for the period of
a correct decode.
(2) Packet mode -respond/de-respond after a
cumulative period of tone or notone in a preset
period.
(3) High-impedance output -for device multiplexing.
For non-µProcessor systems a preset sensitivity/system
input allows external channel level and system setting.
This device, which is suitable for PBX and PABX
line-card and remote telephone installations, is available
in compact 24-pin plastic DIL and small outline (S.O.I.C.)
packages.
The FX641 requires approximately 4.5mA at 5-volts.
4.1
Share Link: 