The Texas Instrument TCM3105 modem chip for your packet or modem project.
TCM3105 chips are tested prior to shipping. All are 16 pin NL or JL package.
The TCM3105 is a single-chip asynchronous frequency-shift-keying (FSK) voice-band modem that uses silicon-gate CMOS technology to implement a switched-capacitor architecture. It is pin selectable (TXR1, TXR2, and TRS) for a wide range of transmit/receive baud rates and is compatible with the applicable BELL 202 or CCITT V23 standards. Operation is fully reversible, thereby allowing both forward and backward channels to be used simultaneously.
The transmitter is a programmable frequency synthesizer that provides two output frequencies (on TXA), representing the marks and spaces of the digital signal present on TXD. The receive section is responsible for the demodulation of the analog signal appearing at the RXA input and is based on the principle of frequency-to-voltage conversion. This section contains a group delay equalizer (to correct phase distortion), automatic gain control, carrier-detect-level adjustment, and bias-distortion adjustment, thereby optimizing performance and giving the lowest possible bit error rate. Carrier-detect information is given to the system by means of the carrier-detect circuits, which set a flag on the CDT output if the level of received in-band energy falls below a value set on the CDL input for a specified minimum duration.
The TCM3105JE and TCM3105NE are characterized for operation from –40°C to 85°C.The TCM3105DWL, TCM3105JL, and TCM3105NL are characterized for operation from 0°C to 70°C.
Specs:
- The power supply 4VDC - 5,5VDC
- DIP-16 Packaging
- Input Analog input interface (RXA), Digital Input (TXD)
- Number of inputs 2
- Output Interface Analog Output (TXA), Digital Output (RXD)
- Total output 2
- Features half duplex / full duplex Half Duplex and Full Duplex
- The data rate is 75, 150, 600 and 1200 bps (Transmit) / 5, 75, 150, 600 and 1200 bps (recieve)