MV8870 Ver la hoja de datos (PDF) - Unspecified

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Fabricante

MV8870

Integrated DTMF Receiver

Unspecified 

MV8870/MV8870-1

ADVANCE INFORMATION

DS3140-2.1

MV8870 / MV8870-1

INTEGRATED DTMF RECEIVER

The MV8870 / MV8870-1 is a complete DTMF receiver

integrating both the bandsplit filter and digital decoder

functions, fabricated in GPS’s double-poly ISO2-CMOS

technology. The filter section uses switched capacitor

techniques for high and low group filters; the decoder uses

digital counting techniques to detect and decode all 16 DTMF

tone pairs into a 4-bit code.

External component count is minimised by on-chip

provision of a differential input amplifier, clock oscillator and

latched 3-state bus interface.

The MV8870 and MV8870-1 are functionally identical, but

differ in Electrical Characteristics.

FEATURES

s Complete DTMF Receiver

s Low Power Consumption

s Internal Gain Setting Amplifier

s Adjustable Guard Time

s Central Office Quality

APPLICATIONS

s Receiver Systems for BT or CEPT Specifications

s Paging Sytems

s Repeater Systems / Mobile Radio

s Credit Card Systems

s Remote Control

IN+ 1

IN- 2

GS 3

VREF 4

SEL 5

PD 6

OSC1 7

OSC2 8

VSS 9

18 VDD

17 St/GT

16 ESt

15 StD

14 Q4

13 Q3

12 Q2

11 Q1 DG18

10 TOE DP18

MP18

VREF 5

NC 6

SEL 7

FHT 8

FH 9

PD 10

NC 11

25 StD

24 NC

23 NC

22 FLT

21 FL

20 Q4

19 Q3

HP28

Figure 1: Pin connections - top view

SEL PD

5(7) 6(10)

1(1)

IN+

2(2)

IN-

3(3)

GS

CHIP CHIP

POWER BIAS

FHT

(8)

HIGH GROUP FILTER

FH

(9)

DIAL TONE FILTER

ZERO

CROSSING

DETECTORS

LOW GROUP FILTER

DIGITAL

DETECTION

ALGORITHM

CODE

CONVERTER

AND LATCH

BIAS CIRCUIT

CHIP

CLOCKS

STEERING LOGIC

11(17)

Q1

12(18)

Q2

13(19)

Q3

14(20)

Q4

10(16)

TOE

18(28) 9(14)

VDD VSS

4(5)

VREF

(22) 7(12) 8(13)

FLT OSC1 OSC2

(21)

FL

16(26)

ESt

15(25)

StD

17(27)

St/GT

Figure 2: Functional block diagram (Pin numbers in brackets refer to HP package)

1

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