MT8840AS Zarlink Semiconductor, MT8840AS Datasheet

no-image

MT8840AS

Manufacturer Part Number
MT8840AS
Description
Manufacturer
Zarlink Semiconductor
Datasheet

Available stocks

Company
Part Number
Manufacturer
Quantity
Price
Part Number:
MT8840AS
Manufacturer:
ZARLINK
Quantity:
3
Part Number:
MT8840AS
Manufacturer:
MITEL
Quantity:
20 000
Features
Applications
Performs ASK (amplitude shift keyed)
modulation and demodulation
32 kHz carrier frequency
Up to 2 kbit/s full duplex data transfer rate
On-chip oscillator
On-chip tone caller for alerting functions
Adjustable tone caller frequencies
Selectable self-loop test mode
5V/2.5mA power supply
ISO
technologies
18 Pin DIP
Simultaneous data and voice communication in
PABXs
"Smart" telephone sets
2 kbit/s data modem
2
RxDO
-CMOS and switched capacitor
TxDI
OSC1
DET
Demodulator
Modulator
OSC2
CRx
Figure 1 - Functional Block Diagram
AGC
V
DD
Control
CK32
Timing
and
TX Bandpass
RX Bandpass
Filter
V
Filter
SS
Description
The MT8840 is a carrier over voice modem which
allows simultaneous transfer of voice and data over a
single pair of wires. Data is transferred on an
amplitude shift keyed (ASK) 32 kHz carrier. On-chip
filters remove voice frequency signals from the
received composite voice and data signal prior to
demodulation. The modulating signal is a bit stream
with a typical data rate of 2 kbit/s. In addition, the
device contains a two tone warbler which functions
as a telephone ringer. The device is fabricated in
Zarlink’s
utilizing switched-capacitor techniques.
V
Ref
MT8840AE
MT8840AS
TX Post-
RX Pre-
double-poly
Filter
Filter
ETC MTC FATC
Caller
Tone
Ordering Information
Data Over Voice Modem
ISO
0 ° C to +85 ° C
LOOP
O
G
18 Pin Plastic DIP
18 Pin SOIC
R
U
N
2
T
I
ISSUE 4
-CMOS
ISO
2
-CMOS
MT8840
TCO
TxO
RxE
RxI
November 1990
technology
5-3

Related parts for MT8840AS

MT8840AS Summary of contents

Page 1

... Modulator RxDO Demodulator DET CRx MT8840AE MT8840AS Description The MT8840 is a carrier over voice modem which allows simultaneous transfer of voice and data over a single pair of wires. Data is transferred on an amplitude shift keyed (ASK) 32 kHz carrier. On-chip filters remove voice frequency signals from the received composite voice and data signal prior to demodulation ...

Page 2

MT8840 ISO -CMOS Pin Description Pin # Name 1 DET Demodulator detection level adjust input (Analog). Internal resistor divider applies 2.36V in open circuit condition. Connection of external resistor will vary detect level. 2 CRx External AGC time constant ...

Page 3

Functional Description The MT8840 contains the demodulator circuitry for 32 kHz ASK signalling as well as a two-tone warbler (tone caller) to replace the function of the mechanical telephone ringer kHz carrier is 100% amplitude modulated by the ...

Page 4

MT8840 ISO -CMOS Micro- UART processor PCM Highway Micro- UART processor Analog To Switch Another SLIC Array Telephone (MT8804) Extension 5-6 Tx Data Tx MT8840 Summing Rx Data Rx Circuit Tx FILTER/ CODEC (MT896X) Rx Figure 3 - Digital ...

Page 5

Summing 2W/4W Telephone Converter line Figure 5 - Smart Telephone Set Block Diagram V DD OSC1 MT8840 OSC2 V SS When a single crystal is shared among a number of MT8840 devices, OSC1 and OSC2 should be a.c. coupled with ...

Page 6

MT8840 ISO -CMOS Absolute Maximum Ratings* Parameter 1 Supply Voltage 2 Voltage On Any Pin 3 Current On Any Pin 4 Storage Temperature 5 Package Power Dissipation * Exceeding these ratings may cause permanent damage. Functional operation under these ...

Page 7

A.C. Characteristics - V =5.0V DD Characteristics 1 Crystal/Clock Frequency 2 Clock Input (OSC 1) 3 Rise Time 4 Fall Time Duty Cycle G 6 Clock Output (OSC Rise Time Fall ...

Page 8

MT8840 ISO -CMOS A.C. Characteristics (Continued) Characteristics 44 D Inband Noise Rejection (S/ Attenuation to Voice Signals M 46 Detect Filter Detector Center Frequency Notes: 1. All A.C. parameters are based on a ...

Page 9

Package Outlines Notes Not to scale 2) Dimensions in inches 3) (Dimensions in millimeters) Plastic Dual-In-Line Packages (PDIP Suffix 8-Pin DIM Plastic Min Max A 0.210 (5.33) A 0.115 (2.92) ...

Page 10

Notes Not to scale 2) Dimensions in inches 3) (Dimensions in millimeters) Plastic Dual-In-Line Packages (PDIP Suffix 22-Pin DIM Plastic Min Max A 0.210 (5.33) A 0.125 (3.18) 0.195 ...

Page 11

16-Pin DIM Min Max Min A 0.093 0.104 0.093 (2.35) (2.65) (2.35) A 0.004 0.012 0.004 1 (0.10) (0.30) (0.10) B 0.013 0.020 0.013 (0.33) (0.51) (0.33) C 0.009 0.013 0.009 (0.231) (0.318) (0.231) D 0.398 0.413 ...

Page 12

...

Page 13

... For more information about all Zarlink products Information relating to products and services furnished herein by Zarlink Semiconductor Inc. trading as Zarlink Semiconductor or its subsidiaries (collectively “Zarlink”) is believed to be reliable. However, Zarlink assumes no liability for errors that may appear in this publication, or for liability otherwise arising from the application or use of any such information, product or service or for any infringement of patents or other intellectual property rights owned by third parties which may result from such application or use ...

Related keywords