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

DTMF/CP

INPUT

C1

R1

C2

R4

R3

R5

R2

X-tal

R5

DTMF

OUTPUT

C4

C6

RLT

MT88L85

IN+

VDD

IN-

St/GT

GS

VRef

ESt

R6

D3

VSS

D2

OSC1

D1

OSC2

D0

NC

NC

NC

PWDN

TONE

IRQ/CP

R/W/WR DS/RD

CS

RS0

VDD

C3

C5

R7

To µP

or µC

Notes:

Example of External Component Values:

R1, R4 = 100 kΩ 1%

R2 = 60.4 kΩ 1%

R5 = 4.7 MΩ 10%

R6 = 374 kΩ 1%

R7 = 3.3 kΩ 10%

*Microprocessor based systems can inject undesirable noise into the supply rails.

The performance of the MT88L85 can be optimized by keeping

noise on the supply rails to a minimum. The decoupling capacitor (C3) should be

connected close to the device and ground loops should be avoided.

RLT = 10 kΩ (min.) 50 kΩ (max.)

C1 = 10 nF 5%

C2 = 10 nF 5%

C3 = 100 nF 10%

C4 = 0.1 µF (to remove the DC component)

C5= 100 nF 5%

C6 = 10 nF 10% (to remove any high frequency components)

X-tal = 3.579545 MHz

For Unity Gain:

R3 = 37.4 kΩ 1%

R5 = 100 kΩ 1%

For +2dB Gain:

R3 = 40.2 kΩ 1%

R5 = 127 kΩ 1%

Figure 14 - Application Circuit (Differential Input Configuration)

17

Zarlink Semiconductor Inc.

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