MT88L85AN1 데이터 시트보기 (PDF) - Microsemi Corporation

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MT88L85AN1

3 V Integrated DTMF Transceiver with Power-Down and Adaptive Micro Interface

Microsemi Corporation 

MT88L85

Data Sheet

The MT88L85 utilizes an adaptive micro interface, which allows the device to be connected to a number of popular

microcontrollers with minimal external logic. The MT88L85 provides enhanced power-down features. The

transmitter and receiver may independently be powered down via register control.

IN+ 1

24

IN- 2

23

GS 3

22

VRef 4

21

VSS 5

20

OSC1 6

19

OSC2 7

18

NC 8

17

NC 9

16

TONE 10

15

R/W/WR 11

14

CS 12

13

24 PIN DIP/SSOP

VDD

St/GT

ESt

D3

D2

D1

D0

NC

PWDN

IRQ/CP

DS/RD

RS0

•

NC 5

25 NC

VRef 6

24 D3

VSS 7

23 D2

OSC1 8

22 D1

OSC2 9

21 D0

NC 10

20 NC

NC 11

19 PWDN

28 PIN PLCC

Figure 2 - Pin Connections

Pin #

24 28

Name

Description

11

22

34

46

57

68

IN+

IN-

GS

VRef

VSS

OSC1

Non-inverting op-amp input.

Inverting op-amp input.

Gain Select. Gives access to output of front end differential amplifier for connection of

feedback resistor.

Reference Voltage output (VDD/2).

Ground (0V).

Oscillator input. This pin can also be driven directly by an external clock. CMOS

compatible.

7 9 OSC2 Oscillator output. A 3.579545 MHz crystal connected between OSC1 and OSC2

completes the internal oscillator circuit. Leave open circuit when OSC1 is driven externally.

10 12

11 13

12 14

TONE

R/W(W

R)

CS

Output from internal DTMF transmitter. High impedance when TOUT bit in Control

Register

A (CRA) is set to low. Requires resistive termination to Vss.

(Motorola) Read/Write or (Intel) Write microprocessor input. CMOS compatible.

Chip Select input must be gated externally by either address strobe (AS), valid memory

address (VMA) or address latch enable (ALE) signal, depending on processor used. See

Figure 12. Must not be tied low. CMOS compatible.

13 15 RS0 Register Select input. Refer to Table 3 for bit interpretation. CMOS compatible.

14 17 DS (RD) (Motorola) Data Strobe or (Intel) Read microprocessor input. Activity on this input is only

required when the device is being accessed. CMOS compatible.

2

Zarlink Semiconductor Inc.

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