CS4121 Datasheet, PDF (1/8 Pages) Cherry Semiconductor Corporation – Low Voltage Precision Air-Core Low Voltage Precision Air-Core

CS4121
Low Voltage Precision Air-Core
Tach/Speedo Driver
Description
Features
The CS4121 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
CS4121 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.
The CS4121 is compatible with the
CS8190, and provides higher accu-
racy at a lower supply voltage (8.0V
min. as opposed to 8.5V). It is func-
tionally operational to 6.5V.
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
Reflow (SMD styles only).............60 sec. max above 183¡C, 230¡C peak
Block Diagram
BIAS
CP+
SQ_OUT
FREQ_IN
Gnd
Gnd
COS+
COS-
V_CC
Charge Pump
Input
Comp.
+
Ð
Voltage
Regulator
V_REG
7.0V
COS
Output
Func.
Gen.
High Voltage
Protection
Ð
+
SINE
Output
+
Ð
F/V_OUT
CP-
V_REG
Gnd
Gnd
SINE+
SINE-
s Direct Sensor Input
s High Torque Output
s Low Pointer Flutter
s High Input Impedance
s Overvoltage Protection
s Accurate to 8V
Functional to 6.5V (typ)
Package Options
16 Lead PDIP
(internally fused leads)
CP+ 1
SQ_OUT 2
FREQ_IN 3
Gnd 4
Gnd 5
COS+ 6
COS- 7
V_CC 8
16 CP-
15 F/V_OUT
14 V_REG
13 Gnd
12 Gnd
11 SINE+
10 SINE-
9 BIAS
20 Lead SOIC
(internally fused leads)
CP+ 1
SQ_OUT 2
FREQ_IN 3
Gnd 4
Gnd 5
Gnd 6
Gnd 7
COS+ 8
COS- 9
V_CC 10
20 CP-
19 F/V_OUT
18 V_REG
17 Gnd
16 Gnd
15 Gnd
14 Gnd
13 SIN+
12 SIN-
11 BIAS
Rev 12/4/96
Cherry Semiconductor Corporation
2000 South County Trail, East Greenwich, RI 02818
Tel: [phone] Fax: [phone]
Email: [e-mail]
Web Site: www.cherry-semi.com
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