MV8870/MV8870-1

1

DS3140-2.1

MV8870 / MV8870-1

INTEGRATED DTMF RECEIVER

DIGITAL

DETECTION

ALGORITHM

CODE

CONVERTER

AND LATCH

HIGH GROUP FILTER

DIAL TONE FILTER

LOW GROUP FILTER

ZERO

CROSSING

DETECTORS

STEERING LOGIC

CHIP

CLOCKS

BIAS CIRCUIT

CHIP

POWER

CHIP

BIAS

1(1)

2(2)

3(3)

IN+

IN-

GS

18(28)

9(14)

4(5)

FLT

(22)

OSC1

7(12)

OSC2

8(13)

FL

(21)

ESt

16(26)

StD

15(25)

St/GT

17(27)

TOE

10(16)

Q4

14(20)

Q3

13(19)

Q2

12(18)

Q1

11(17)

FH

(9)

FHT

(8)

PD

6(10)

SEL

5(7)

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

Figure 1: Pin connections - top view

25

24

23

22

21

20

19

5

6

7

8

9

10

11

NC

SEL

FHT

FH

PD

NC

StD

NC

NC

FLT

FL

Q4

Q3

HP28

IN+

IN-

GS

SEL

PD

OSC1

OSC2

1

2

3

4

5

6

7

8

9

18

17

16

15

14

13

12

11

10

St/GT

ESt

StD

Q4

Q3

Q2

Q1

TOE

DG18

DP18

MP18

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

ADVANCE INFORMATION