MSM6948 Ver la hoja de datos (PDF) - Oki Electric Industry

Número de pieza

componentes Descripción

Lista de partido

MSM6948

1200 bps Single Chip MSK Modem

Oki Electric Industry 

¡ Semiconductor

MSM6948/6948V

PIN DESCRIPTION

Name

X1

X2

*MCK

ME

Description

Crystal connection pins.

A 3.6864 MHz crystal shall be connected.

When an external clock is applied for MSM6948's oscillation source, it has to be input to X2.

In this case, X2 has to be AC-coupled by the capacitor of 200 pF. X1 shall be left open.

3.6864 MHz ±0.02% clock output.

This can be used for other devices under limited load conditions.

When digital "1" is put on this pin, MSK modulator output is connected to the input of

transmit LPF.

When digital "0" is put on, the input of transmit LPF is connected to TI that is voice signal input.

The data put on ME terminal is synchronized with the rising edge of ST and input to internal

logic as a control data. The rising edge of this synchronized data resets MSK modulator.

Transmit data input.

The data on this pin is synchronized with the rising edge of ST and input to MSK modulator

as an actual transmit data.

SD

SD

ST

MSK

Modulated

Data

SD 50%

SD 50%

tsetup

thold

tsetup; Min. 300 ns

thold ; Min. 300 ns

ST

ST is synchronizing signal used for ME and SD.

This is made from master clock and is usually 1200 Hz.

Built-in analog signal ground.

The DC voltage is approximately half of VDD, so the analog signals of AI, AO, and TI interfaces

SG

with peripheral circuits which must be implemented by AC-coupling. To make this voltage

source impedance lower and ensure the device performance, it is necessary to put a bypass

capacitor on SG in close physical proximity to the device.

AG

Analog ground.

This pin should be common with DG at the system ground point as close as possible.

*NC : MSM6948V

4/13

Share Link: