MSM6882-3 Oki Semiconductor, MSM6882-3 Datasheet

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MSM6882-3

Manufacturer Part Number
MSM6882-3
Description
2400/1200 bps Single Chip MSK Modem
Manufacturer
Oki Semiconductor
Datasheet
E2A0035-16-X0
¡ Semiconductor
¡ Semiconductor
MSM6882-3/6882-5
2400/1200 bps Single Chip MSK Modem
GENERAL DESCRIPTION
The MSM6882-3/6882-5 is a single chip MSK (Minimum Shift Keying) modem which is fabricated
by Oki’s low power consumption CMOS silicon gate technology.
The demodulator receives the data to be transmitted (SD) synchronized with the transmit timing
clock (ST) generated by the on-chip clock generator. The signal, which is modulated by MSK method,
is output.
The demodulator converts the received MSK signal to the received data (RD) by means of a delay
detection technique after limiting the band of the received MSK signal. This signal is input to the
digital PLL and the re-generated timing clock (RT) is output from the demodulator, synchronized
with the RD.
FEATURES
• Signal power supply:+3.6 V
• On-chip SCF (Switched Capacitor Filter)
• The transmit filter can be also used as voice splatter filter.
• The receive timing re-generator has two different lock-in time performance options to be chosen
• Bit rate 2400/1200 bps
• CCIR Rec. 623
• The modulation method can be selected from COS-FFSK and SIN-FFSK.
• Built-in crystal oscillation circuit.
• Package options:
from.
22-pin plastic DIP
24-pin plastic SOP
+5 V
(DIP22-P-400-2.54)
(SOP24-P-430-1.27-K)
(MSM6882-3)
(MSM6882-5)
(Product name: MSM6882-3RS)
(Product name: MSM6882-5RS)
(Product name: MSM6882-3GS-K)
(Product name: MSM6882-5GS-K)
Previous version: Nov. 1996
This version: Jan. 1998
MSM6882-3/6882-5
1/15

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MSM6882-3 Summary of contents

Page 1

... Single Chip MSK Modem GENERAL DESCRIPTION The MSM6882-3/6882 single chip MSK (Minimum Shift Keying) modem which is fabricated by Oki’s low power consumption CMOS silicon gate technology. The demodulator receives the data to be transmitted (SD) synchronized with the transmit timing clock (ST) generated by the on-chip clock generator ...

Page 2

... Modu- SD lator PRE SIN Timing Re-generator RD CT MCS Post Detection Filter 1 RC Transmit LPF LPF 0 LIM PRE Mixer LPF PDF * Clock Generator MSM6882-3/6882 LPF 0 0 Receive BPF LPF Delay SH Detector V DD Signal Ground GND SG 2/15 ...

Page 3

... MCS SIN PRE 8 16 CDO CDT GND GND 24-Pin Plastic SOP MSM6882-3/6882 (NC CDO 16 CDT 3/15 ...

Page 4

... When a "low" is input on this pin, the data put on the SD pin is output on the AO pin. When a "high" is input on this pin, the data put on the SD pin is neglected and preamble data PRE is output. Data put on PRE is latched on the rising edge of ST. Preamble means to modulate as 010101...pattern. Description 3.6864 MHz 7.3728 MHz MSM6882-3/6882 4/15 ...

Page 5

... AI, AO, and TI DD Transmit LPF Power On The Output of Receive BPF Power Down No-signal (SG level) Power down Transmit LPF SG Modu- lator Receive BPF MSM6882-3/6882-5 Carrier Freq. (Hz) Mark Space 1200 2400 1200 1800 1200 1800 600 1200 600 900 ...

Page 6

... FT When digital "0" is input to this pin, transmit LPF enters in power down mode, but the output buffer operational amplifier remains active. In this case level. Power supply. MSM6882-3: 3.6 V MSM6882- This device is sensitive to supply noise as switched capacitor techniques are utilized. ...

Page 7

... Equivalent Series — Resistance Load Capacitance — Oscillation Frequency — Frequency Deviation — Temperature — Characteristics Equivalent Series — Resistance Load Capacitance — *1 MSM6882-3 *2 MSM6882-5 Condition Ta = 25°C With respect to GND — — Condition Min. *1 3.0 With respect to GND *2 4.5 — — — ...

Page 8

... V IL Input Voltage * OL1 Output Voltage * OH1 *1 Upper is specified for the MSM6882-3, lower for the MSM6882-5 *2 MCS, ME, SD, SIN, PRE, BR, CF, CT ST, RD, RT Digital Interface Characteristics Parameter Symbol Input Data Set-up Time t S Input Data Hold Time t H ...

Page 9

... AI V IR1 Receive Signal Level V IR2 1200 bps Bit Error Rate BER 2400 bps *1 Upper is specified for the MSM6882-3, lower for the MSM6882 dBm = 0.775 Vrms (MSM6882-3: V (MSM6882-5: V Condition SD = "1" "1" "0" "0" "1" "1" ...

Page 10

... Re-generated receive data timing clock output (RT) Parameter Symbol N Data Bit Number for PLL' PLL1 Lock-in N PLL2 *3 Data bit number to lock-in within 22.5 degree Condition Min. CT= "0" — "1" *3 CT= "1" — MSM6882-3/6882-5 Typ. Max. Unit — 18 bit — 50 10/15 ...

Page 11

... Semiconductor TIMING DIAGRAM ST SD, PRE RT RD 50% 50 Figure 1 Input Data Timing 50% 50 Figure 2 Output Data Timing MSM6882-3/6882-5 11/15 ...

Page 12

... Receive Band-Pass Filter –70 Note: When BR = "1", frequency converter circuit (MIXER) is prepared before the receive BPF. Therefore, 1200 Hz input signal is converted to 3600 Hz at BPF output for example 1.5 2 2.5 MSM6882-3/6882-5 FREQ (kHz FREQ (kHz) 3 3.5 4 12/15 ...

Page 13

... Semiconductor APPLICATION CIRCUIT Crystal 7.3728 MHz MCS SIN CDO 16 8 PRE CDT GND TI 12 MSM6882-3/6882 13/15 ...

Page 14

... Semiconductor PACKAGE DIMENSIONS DIP22-P-400-2.54 MSM6882-3/6882-5 (Unit : mm) Package material Epoxy resin Lead frame material 42 alloy Pin treatment Solder plating Solder plate thickness more Package weight (g) 1.90 TYP. 14/15 ...

Page 15

... Therefore, before you perform reflow mounting, contact Oki’s responsible sales person for the product name, package name, pin number, package code and desired mounting conditions (reflow method, temperature and times). MSM6882-3/6882-5 (Unit : mm) Package material Epoxy resin ...

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