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

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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

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