CS289
CS289
20mA Air-Core Tachometer Drive Circuit
Description
The CS289 is specifically designed
for use with air-core meter move-
ments. The IC has charge pump cir-
cuitry for frequency-to-voltage con-
version, a shunt regulator for stable
operation, a function generator, and
sine and cosine amplifiers. The
buffered sine and cosine outputs
will typically sink or source 20mA.
Features
s
Single Supply Operation
s
On-Chip Regulation
s
20mA Output Drive
Capability
Absolute Maximum Ratings
Supply Voltage (V
CC
)......................................................................................20V
Operating Temperature ............................................................Ð40¡C to +100¡C
Junction Temperature..................................................................Ð40¡C to 150¡C
Storage Temperature.................................................................Ð65¡C to +150¡C
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
Package Options
14L PDIP
V
Z
1
Pwr Gnd
V
CC
V
COS
V
REG
S
Q
IN
S
Q
OUT
F/V
OUT
Pwr Gnd
V
CC
V
COS
V
REG
S
Q
IN
S
Q
OUT
F/V OUT
V
SINE
NC
V
BIAS
C
P
Ð
C
P
+
Gnd
Regulator
Charge
Pump
20L SOIC Wide
(internally fused leads)
V
Z
1
V
SINE
V
CC
V
COS
V
REG
Gnd
Gnd
Gnd
Gnd
S
Q
IN
S
Q
OUT
F/V
OUT
Function
Generator
V
BIAS
Ð +
Gnd
Gnd
Gnd
Gnd
C
P
Ð
V
Z
V
SINE
V
BIAS
C
p
Ð
C
P
+
Gnd
C
P
+
NC
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. 3/8/99
1
A
¨
Company
CHERRY [ CHERRY SEMICONDUCTOR CORPORATION ]
