MSM7715 Overview
The MSM7715 is a signal transmitting and receiving LSI device for applications such as telemeters. The MSM7715 uses a no-ringing munication mode. Built-in functions includes a 300 bps full-duplex modem plying with ITU-T V.21, a DTMF signal (PB signal) generator and receiver, and a call progress tone (CPT) detector.
MSM7715 Key Features
- 3 V power supply. (Voltage range is 2.5 V to 3.6 V.)
- Selectable modes, including DTMF signal sending mode, DTMF signal receiving mode, and V.21 modem answer/originate mode
- For DTMF signal reception, support for normal detection mode or high-speed detection mode
- For call progress tone detection, support for rectangular wave output or detection output
- DTMF signal receiving output, which is in a 3-state mode, is able to be connected externally with the DTMF signal sendin
- Analog loopback test and remote digital loopback test supported
- Dedicated pins for modem sending/receiving data, carrier detection, sending request, and call progress tone detection
- Independent external adjustment of the analog signal using the modem signal and DTMF signal
- External adjustment of the carrier detection level
- Internal 3.579545 MHz crystal oscillation circuit
MSM7715 Applications
- 3 V power supply. (Voltage range is 2.5 V to 3.6 V.)