FEATURES - Wide Operating Supply Voltage Range (2.0V to 16V), Allows Telephone Line Powered Applications - Low Quiescent Supply Current for Battery Powered Applications - Chip Disable Input to Power Down the IC - Low Power-Down Quiescent Current - Drives a Wide Range of Speaker Loads (8.0Ω to 100Ω) - Output Power Exceeds 250mW with 32Ω Speaker - Low Total Harmonic Distortion - Gain Adjustable from below 0dB to over 46dB for Voice Band - Requires Few External Components   DESCRIPTION The MC34119 is a low power audio amplifier integrated circuit intended (primarily) for telephone applications, such as in speakerphones. It provides differential speaker outputs to maximize output swing at low supply voltages (2.0V minimum). Coupling capacitors to the speaker are not required. Open loop gain is 80dB, and the closed loop gain is set with two external resistors. A Chip Disable pin permits powering down and/or muting the input signal. The MC34119 is available in standard 8 pin DIP and SOP package.   read more

FEATURES - Improved Attenuator Gain Range: 52dB Between Transmit and Receive - Low Voltage Operation for Line-Powered Application (3.0V to 6.5V) - 4-Point Signal Sensing for Improved Sensitivity - Background Noise Monitors for Both Transmit and Receive Paths - Microphone Amplifier Gain Set by External Resistors - Mute Function Included - Chip Disable for Active/Standby Operation - Dial Ton Detector to Inhibit Receive Idle Mode During Dial Tone Presence - Standard 28-Pin Plastic DIP Package and SOP Package Available - Compatible with MC34119 Speaker Amplifier   DESCRIPTION The MC34118 Voice Switched Speakerphone Circuit incorporates the necessary amplifiers, attenuators, level detectors, and control algorithm to form the heart of a high quality hands-free speakerphone system. Included are a microphone amplifier with adjustable gain and MUTE control, Transmit and Receive attenuators which operate in a complementary manner, level detectors at both input and output of both attenuators, and background noise monitors for both the transmit and receive channels. A Dial Tone Detector prevents the dial tone from being attenuated by the Receive background noise monitor circuit. Also included are two line driver amplifiers which can be used to form a hybrid network in conjunction with an external coupling transformer. A high-pass filter can be used to filter out 60Hz noise in the receive channel, or for other filtering functions. A Chip Disable pin permits powering down the entire circuit to conserve power on long loops where loop current is at a minimum. The MC34118 may be operated from a power supply, or it can be powered from the telephone line, requiring typically 5.0mA. The MC34118 can be interfaced directly to Tip and Ring (through a coupling transformer) for stand-alone operation, or it can be used in conjunction with a handset speech network and/or other features of a featurephone.   read more

FEATURES  - Direct Sensor Input - High Output Torque - Low Pointer Flutter - High Input Impedance - Over Voltage Protection - Return to Zero   DESCRIPTION The CS8190 is specially designed for use with air-core meter movements. The IC provides all the functions necessary for an analog tachometer or speedometer. The CS8190 takes a speed sensor input and generates sine and cosine related output signals to differentially drive an air-core meter. The output utilizes differential drivers which eliminated the need for a Zener reference and offers more torque. The device withstands 60V transients which decreases the protection circuitry required.   read more

FEATURES - Exact equivalent in most cases for SE/NE555 - Low Supply Current - High speed operation - 500KHz guaranteed - Wide operation supply voltage range - 2V to 18V - Timing from microseconds through hours - Operates in both astable and monostable modes - Adjustable duty cycle - High output source/sink driver can drive TTL/CMOS   DESCRIPTION The NE555 is CMOS RC timers providing significantly improved performance over the standard SE/NE555 and 355 timers, while at the same time being direct replacements for those devices in most applications. Improved parameters include low supply current, wide operating supply voltage range, low THRESHOLD, TRIGGER and RESET currents, no crowbarring of the supply current during output transitions, higher frequency performance and no requirement to decouple CONTROL VOLTAGE for stable operation. Specifically, the NE555 is stable controller capable of producing accurate time delays of frequencies. read more