CH1799A Overview
Furthermore, specific applications are supported by 22 pins.
CH1799A Features
22 pin count

CH1799A Applications
There are a lot of Cermetek MicroElectronics, Inc
CH1799A Modems ICs & Modules applications.

Cordless telephone
Desktop PC
Notebook
Pocket PC
Desktop radio
Clock radio
Tuner
Portable radio
Car radio
Satellite radio receiver

PCB changed	22
Package Width	25.65
Package Length	32.26
Package Height	13.21
Mounting	Through Hole
Maximum Operating Temperature (°C)	70
Minimum Operating Temperature (°C)	0
Typical Supply Current (mA)	52|62
Maximum Operating Supply Voltage (V)	3.6|5.5
Typical Operating Supply Voltage (V)	3.3|5
Minimum Operating Supply Voltage (V)	4.5|3
Transmission Media Type	Cable
Maximum Data Rate	115.2Kbps
Maximum Data Rate Range	56Kbps to 256Kbps
Main Category	Single Chip
HTS	8517.62.00.10
ECCN (US)	EAR99
Part Status	Active
Pin Count	22
Power Supply Type	Analog
RoHS Status	RoHS non-compliant