MSM7532 Datasheet, PDF (1/21 Pages) OKI electronic componets – Single Chip MSK Modem with Compandor for Cordless Telephone

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This version: J_Man_S._M19₇9₅8₃₂
Previous version: Nov. 1996
MSM7532
Single Chip MSK Modem with Compandor for Cordless Telephone
GENERAL DESCRIPTION
The MSM7532 is a baseband device with a modem function and a baseband voice signal processing
function for analog cordless telephone. The voice signal transmitter in this IC consists of a high-pass
filter, compressor, scrambler, pre-emphasis, limiter, and splatter filter.
The voice signal receiver consists of a bandpass filter, a de-scrambler , a de-emphasis, an expander,
an electronic volume, and a ceramic receiver driving circuit.
The MODEM in this IC transmits and receives MSK (Minimum Shift Keying) modem signals.
FEATURES
• Built-in ceramic receiver drive amplifiers
• The compander input reference level, limiter level, and modem transmit level are easy to be
externally adjusted.
• Built-in 2-bit electronic volume
• A microphone amplifier and an amplifier available for users are built in.
• Mode settings using parallel interfaces
• Built-in compander dynamic range: 70 dB
• Built-in maximum gain limit circuit for expander
• The bit rate of MSK modem is switchable between 2400 bps and 1200 bps.
• Scrambler and emphasis can be used by serially connecting them or can be used separately with
each other.
• Three kinds of the reverse frequency of the scrambler are selectable.
• The modem receiver functions detect bit synchronous signals and frame synchronous signals.
• Four-step power down modes
• Built-in crystal oscillation circuit
• Wide range of power supply (1.8 V to 5.5 V)
• Package:
56-pin plastic QFP (QFP56-P-910-0.65-2K) (Product name : MSM7532GS-2K)
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