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FX641 参数 Datasheet PDF下载

FX641图片预览
型号: FX641
PDF下载: 下载PDF文件 查看货源
内容描述: 双用户私人测光( SPM )检测器 [Dual Subscriber Private Metering (SPM) Detector]
分类和应用:
文件页数/大小: 13 页 / 130 K
品牌: CMLMICRO [ CML MICROCIRCUITS ]
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CML Semiconductor Products
PRODUCT INFORMATION
FX641
Features
Two (12kHz/16kHz) SPM
Detectors on a Single Chip
Detects 12kHz and 16kHz SPM
Frequencies
Dual Subscriber Private
Metering (SPM) Detector
Publication D/641/4 February 2001
Provisional Issue
Selectable Tone Follower or
Packet Mode Outputs
High Speech-Band Rejection
Properties
“Output Enable” Multiplexing
Facility
Call-Charge Applications on
PABX Line Cards
V
DD
CLOCK IN
CLOCK
DIVIDERS
V
BIAS
INTERNAL
CLOCKS
Xtal Accuracy; Stable Frequency
Limits
“Controlled” (µC) and “Fixed”
Signal Sensitivity Modes
CLOCK OUT
XTAL/CLOCK
XTAL/CLOCK
GENERATOR
XTAL
BUFFER
V
SS
12kHz/16kHz
SYSTEM
Ch 1
COMPARATOR
TONE FOLLOWER
MODE
Ch 1 AMP OUT
Ch1 AMP IN (-)
Ch 1
OUTPUT
Ch1 AMP IN (+)
Ch 1
INPUT
AMPLIFIER
GAIN
ADJUST
INTERNAL
COMPARATOR
THRESHOLD
PRESET LEVEL
CHIP SELECT
SERIAL
DATA
SERIAL
INPUT
LOGIC
LEVEL/
SYSTEM
SETTING
SERIAL
CLOCK
SYSTEM SELECT
Ch 2
INPUT
AMPLIFIER
GAIN
ADJUST
INTERNAL
COMPARATOR
THRESHOLD
Ch2 AMP IN (-)
-
Ch 2
BANDPASS
FILTER
+
-
Ch 2
COMPARATOR
Ch2 AMP IN (+)
Ch 2 AMP OUT
TONE FOLLOWER
MODE
Fig.1 Functional Block Diagram
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.
+
12kHz/16kHz
SYSTEM
Ch 1
BANDPASS
FILTER
-
+
+
-
PULSE
GENERATOR
AND
DIVIDER
PULSE
MEASUREMENT
LOGIC
PULSE
LENGTH
LOGIC
PACKET
MODE
OUTPUT
SELECT
CIRCUITS
CHANNEL 1
OUTPUT
ENABLE
12kHz/16kHz
SYSTEM
FX641
OUTPUT
SELECT
CHANNEL 2
PULSE
GENERATOR
AND
DIVIDER
PACKET
MODE
PULSE
MEASUREMENT
LOGIC
PULSE
LENGTH
LOGIC
OUTPUT
SELECT
CIRCUITS
Ch 2
OUTPUT