LC73881M 查看數據表（PDF） - SANYO -> Panasonic

零件编号

产品描述 (功能)

生产厂家

LC73881M

DTMF Receiver LSI

SANYO -> Panasonic 

Pin Functions

Pin No.

1

2

3

4

5

6

Symbol

INPUT

PD

OSCO

OSCI

VSS

SD

7

ACK

8

STD

9

EST

10

VDD

Block Diagram

LC73881M

I/O

Function

I The input must be capacitor coupled. This signal is biased to VDD/2 internally.

I The LC73881M goes to low power mode when this pin is set high.

O Connect a 4.194304 MHz crystal oscillator or ceramic resonator to these pins to from an oscillator circuit.

I When using a ceramic resonator, a capacitor of approximately 30 pF must be connected to each pin.

Power supply pin. Normally 0 V.

O The decoded DTMF signal is output, this pin in a 4-bit LSB first format.

The ACK pin is used to shift out data from the SD pin. Four pulses are required to shift out the DTMF

I character, which consists of four bits. The rising edge of the first pulse latches the data (before shifting)

into the shift register.

A high level indicates the presence of a DTMF signal. Although the rise of this signal is later than that of the

O EST pin, it is less sensitive to burst waveforms and other noise.

A high level indicates the presence of a DTMF signal. Applications should monitor this pin and, after waiting

O an appropriate period, apply four pulses to the ACK pin to access the data.

Power supply pin. Normally 2.7 to 5.5 V.

Test Circuit, Sample Application Circuit

No. 5000-3/6

Share Link: