Precision Air-Core Tach/Speedo Driver

with Separate Function Generator Input

Features

1

Package Option

20 Lead PDIP

1

CP+

2

3

4

5

6

7

8

BIAS

Gnd

Gnd

NC

COS+

16

15

14

13

12

11

10

CP-

NC

Gnd

Gnd

NC

SIN+

9

COS-

SIN-

17

18

19

20

CS4101

Description

Block Diagram

April, 2001 - Rev. 5

ON Semiconductor

2000 South County Trail, East Greenwich, RI 02818

Tel: (401)885–3600 Fax: (401)885–5786

N. American Technical Support: 800-282-9855

Web Site: www.onsemi.com

Absolute Maximum Ratings

The CS4101 is specifically designed

for use with air-core meter move-

ments. The IC provides all the func-

tions necessary for an analog

tachometer or speedometer. The

CS4101 takes a speed sensor input

and generates sine and cosine relat-

ed 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. The output uti-

lizes differential drivers which elim-

inates the need for a zener reference

and offers more torque. The device

withstands 60V transients which

decreases the protection circuitry

required. The device is also more

precise than existing devices allow-

ing for fewer trims and for use in a

speedometer.

Absolute Maximum Ratings

Operating Temperature .............................................................–40°C to +105°C

Storage Temperature..................................................................–40°C to +165°C

Junction Temperature .................................................................–40°C to+150°C

ESD (Human Body Model) .............................................................................4kV

Lead Temperature Soldering

Wave Solder(through hole styles only).............10 sec. max, 260°C peak

SINE-

SINE+

Gnd

SINE

Output

COS

Output

7.0V

COS-

COS+

Gnd

Gnd

CP+

Input

Comp.

Gnd

CP-

Voltage

Regulator

+

–

+

–

High Voltage

Protection

Charge Pump

BIAS

Func.

Gen.

s

Direct Sensor Input

s

High Output Torque

s

Low Pointer Flutter

s

High Input Impedance

s

Overvoltage Protection

Block Diagram