SGS Thomson Microelectronics L290B Datasheet
L290
TACHOMETER CONVERTER
DESCRIPTION
TheL290, amonolithicLSI circuitin 16-lead inline
plasticpackage,is intendedforuser withthe L291
and L292 which together from a complete 3-chip
DC motor positioning system for applications
such as carriage/daisy-wheel position control in
typewriters.
TheL290/1/2 system can be directly controlled by
a microprocessor.The L290 integratesthe following functions:
- tacho voltagegenerator (F/V converter)
ORDER CODE : L290B
- referencevoltage generator
- positionpulse generator
ABSOLUTE MAXIMUM RATING
Symbol Parameter Value Unit
V
s
V
(FTA,FTB, FTF) Input Signals ± 7V
i
P
tot
T
stg,Tj
Supply Voltage ± 15 V
TotalPower Dissipation (T
Storage and Junction Temperature -40 to + 150 °C
=70°C) 1 W
amb
DIP-16 Plastic
(0.25)
SYSTEMBLOCK DIAGRAM
March 1993
1/8
L290
CONNECTION DIAGRAM (top view)
BLOCKDIAGRAM
2/8
TEST CIRCUIT
THERMAL DATA
L290
Symbol Parameter Value Unit
R
th-j-amb
ELECTRICALCHARACTERISTICS (Refer to the test circuit, S in (A),Vs= ± 12 V, T
Thermal resistance junction-case Max 80 °C/W
=25°C
amb
unless otherwise specified)
Symbol Parameter Test conditions Min. Typ. Max. Unit
V
I
Supply Voltage ± 10 ± 15 V
s
Quiescent Drain Current Vs= ± 15 V 13 20 mA
d
INPUT AMPLIFIERS (A1and A2)
FTA,FTB Input Signal from Encoder
(pin 1, 16)
V
Output Offset Voltage
os
(pin 2, 15)
I
G
V
Input Bias Current (pin 1, 16) 0.15 µA
b
VoltageGain f = 10 KHz FTA=
v
Output Voltage Swing
0
(pin 2, 15)
f
= 20 KHz ± 0.4 ± 0.6 V
max
FTA= FTB = 0 V ± 55 mV
22 23 24 dB
FTB = ± 0.6V
FTA= FTB = ± 1Vp
p
± 9.5 V
p
3/8
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