MT88L70AC MITEL [Mitel Networks Corporation], MT88L70AC Datasheet

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MT88L70AC

Manufacturer Part Number
MT88L70AC
Description
3 Volt Integrated DTMF Receiver
Manufacturer
MITEL [Mitel Networks Corporation]
Datasheet
Features
Applications
PWDN
IN +
2.7 - 3.6 volt operation
Complete DTMF receiver
Low power consumption
Internal gain setting amplifier
Adjustable guard time
Central office quality
Power-down mode
Inhibit mode
Functionally compatible with Mitel’s MT8870D
Paging systems
Repeater systems/mobile radio
Credit card systems
Remote control
Personal computers
Telephone answering machine
IN -
GS
Power
Chip
OSC1
VDD
Chip
Bias
Circuit
Bias
VSS
Tone
Filter
Dial
OSC2
High Group
Figure 1 - Functional Block Diagram
Low Group
Filter
Filter
to all
Chip
Clocks
Zero Crossing
Detectors
VRef
Buffer
VRef
St/GT
Description
The MT88L70 is a complete 3 Volt, DTMF receiver
integrating both the bandsplit filter and digital
decoder functions. The filter section uses switched
capacitor
filters;
techniques to detect and decode all 16 DTMF tone-
pairs into a 4-bit code. External component count is
minimized by on chip provision of a differential input
amplifier, clock oscillator and latched three-state bus
interface.
3 Volt Integrated DTMF Receiver
MT88L70AC
MT88L70AE
MT88L70AS
MT88L70AN
MT88L70AT
St
GT
the
ESt
Detection
Algorithm
techniques
Digital
INH
ISO
Steering
Logic
Ordering Information
decoder
-40 °C to + 85 °C
2
-CMOS
ISSUE 2
STD
18 Pin Ceramic DIP
18 Pin Plastic DIP
18 Pin SOIC
20 Pin SSOP
20 Pin TSSOP
Converter
and Latch
for high and low group
Code
uses digital counting
MT88L70
TOE
May 1995
Q1
Q2
Q3
Q4
4-23

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MT88L70AC Summary of contents

Page 1

... Chip Power Bias IN + Dial Tone Filter OSC1 3 Volt Integrated DTMF Receiver MT88L70AC MT88L70AE MT88L70AS MT88L70AN MT88L70AT Description The MT88L70 is a complete 3 Volt, DTMF receiver integrating both the bandsplit filter and digital decoder functions. The filter section uses switched capacitor filters; ...

Page 2

MT88L70 VRef INH PWDN OSC1 7 11 OSC2 8 10 VSS 9 18 PIN CERDIP/PDIP/SOIC Pin Description Pin # Name ...

Page 3

Functional Description The MT88L70 monolithic DTMF receiver offers small size, low power consumption and high performance, with 3 volt operation. Its architecture consists of a bandsplit filter section, which separates the high and low group tones, followed by a digital ...

Page 4

MT88L70 REC DP GTP GTA The value device parameter (see Figure 7) DP and t is the minimum signal duration to be REC recognized by the receiver. A ...

Page 5

C 1 DTMF Input X-tal Figure 6 - Single-Ended Input Configuration the input pins are connected as shown in Figure 6 with the op-amp connected for unity gain and V biasing the input at 1/2V . ...

Page 6

MT88L70 Absolute Maximum Ratings Parameter 1 DC Power Supply Voltage 2 Voltage on any pin 3 Current at any pin (other than supply) 4 Storage temperature 5 Package power dissipation † Exceeding these values may cause permanent damage. Functional operation ...

Page 7

Operating Characteristics - V Gain Setting Amplifier Characteristics 1 Input leakage current 2 Input resistance 3 Input offset voltage 4 Power supply rejection 5 Common mode rejection 6 DC open loop voltage gain 7 Unity gain bandwidth 8 Output voltage ...

Page 8

MT88L70 AC Electrical Characteristics Characteristics 1 Tone present detect time 2 Tone absent detect time Tone duration accept Tone duration reject Interdigit pause accept 6 Interdigit pause reject 7 Propagation delay ...

Page 9

A EVENTS t REC V in ESt St/ DECODED TONE # (n- StD TOE EXPLANATION OF EVENTS A) TONE BURSTS DETECTED, TONE DURATION INVALID, OUTPUTS NOT UPDATED. B) TONE #n DETECTED, TONE DURATION VALID, TONE DECODED ...

Page 10

MT88L70 NOTES: 4-32 ...

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