CS4121

Features:

·Direct Sensor Input
·High Torque Output
·Low Pointer Flutter
·High Input Impedance
·Overvoltage Protection
·Accurate to 8V Functional to 6.5V (typ)


Specifications

Supply Voltage (<100ms pulse transient)......................................................................................VCC = 60V
(continuous) .................................................................................................................................VCC = 24V
Operating Temperature ......................................................................................................-40 to +105
Storage Temperature..........................................................................................................-40 to +165
Junction Temperature ..........................................................................................................-40 to+150
ESD (Human Body Model) ........................................................................................................................4kV
Lead Temperature Soldering Wave Solder (through hole styles only)......................10 sec. max, 260peak
Reflow (SMD styles only)......................................................................60 sec. max above 183¡C, 230peak


Description

The CS4121 is specifically designed for use with air-core meter movements. The IC provides all the functions necessary for an analog tachometer or speedometer. The CS4121 takes a speed sensor input and generates sine and cosine related output signals to differentially drive an air-core meter.

Many enhancements have been added over industry standard tachometer drivers such as the CS289 or LM1819. CS4121 output utilizes differential drivers which eliminates the need for a zener reference and offers more torque. The device withstands 60V transients which decreases the protection circuitry required. CS4121 is also more precise than existing devices allowing for fewer trims and for use in a speedometer.

The CS4121 is compatible with the CS8190, and provides higher accuracy at a lower supply voltage (8.0V min. as opposed to 8.5V). It is functionally operational to 6.5V.