CS4101
CS4101
Precision Air-Core Tach/Speedo Driver
with Separate Function Generator Input
Description
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
CS-289 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.
Features
s
Direct Sensor Input
s
High Output Torque
s
Low Pointer Flutter
s
High Input Impedance
s
Overvoltage Protection
Absolute Maximum Ratings
Supply Voltage (<100ms pulse transient) .........................................V
CC
= 60V
(continuous)..............................................................V
CC
= 24V
Operating Temperature .............................................................Ð40¡C to +105¡C
Storage Temperature..................................................................Ð40¡C to +165¡C
Junction Temperature .................................................................Ð40¡C to+150¡C
ESD (Human Body Model) .............................................................................4kV
Lead Temperature Soldering
Wave Solder(through hole styles only).............10 sec. max, 260¡C peak
Block Diagram
+
Input
Comp.
FREQ
IN
Voltage
Regulator
+
V
REG
7.0V
Gnd
COS+
+
Ð
+
Ð
COS
Output
Func.
Gen.
+
Ð
COS-
High Voltage
Protection
Ð
Charge Pump
Ð
SINE
Output
+
Ð
SINE-
BIAS
CP+
SQ
OUT
Package Option
F/V
OUT
CP-
F
GEN
20 Lead PDIP
CP+
1
SQ
OUT
FREQ
IN
2
3
4
20
19
18
17
16
15
14
13
12
11
CP-
F/V
OUT
V
REG
NC
Gnd
Gnd
NC
SIN+
SIN-
F
GEN
V
REG
Gnd
Gnd
SINE+
Gnd
BIAS
Gnd
5
Gnd
6
NC
7
COS+
8
COS-
9
V
CC
10
V
CC
Cherry Semiconductor Corporation
2000 South County Trail, East Greenwich, RI 02818
Tel: (401)885-3600 Fax: (401)885-5786
Email: info@cherry-semi.com
Web Site: www.cherry-semi.com
Rev 11/20/98
1
A
¨
Company
CHERRY [ CHERRY SEMICONDUCTOR CORPORATION ]
