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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
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Page 3
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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L290
ELECTRICALCHARACTERISTICS (continued)
Symbol Parameter Test conditions Min. Typ. Max. Unit
COMPARATORS WITH HYSTERESIS (C1,C2, and C3)
V
(°) Positive Threshold Voltage
THP
(pin 2, 12, 15)
(° °) Negative Threshold Voltage
V
THN
(pin 2, 12, 15)
∆FTF Threshold Hysteresis C
V
Output Voltage(low level)
L
(pin 10, 13, 14)
I
leak
(pins 10, 13, 14) FTA= FTB = 0.5 V
and C
C
1
2
C
3
C
and C
1
2
C
3
3
I0=2mA
FTA= FTB = FTF = 0 V
V
= 5 V FTF = 1 V
CE
550 850 mV
700 900 mV
55 175 mV
570 830 mV
72 120 mV
0.2 0.4 V
1
REFERENCE GENERATOR
Vref DC Reference Voltage
(pin 3)
Iref Output Current (pin 3) 1.4 mA
FTA= FTB = ± 0.5 Vp(*)
I
=1mA
ref
4.5 5 5.5 V
”TACHO”AMPLIFIER (A3)
V
V
V
V
V
∆V
V
MA
MB
bias
Output Offset Voltage (pin 4) FTA= ± 15 mV FTB = 0.5V ± 80 mV
os
DC Output Voltage (pin 4) FTA= FTB =
o
± 0.5 V
p
VMA = VMB =
± 1.25 V
0
Output VoltageSwing (pin 4) FTA= FTB = 0.5V 9
0
V01+V
p
02
(**)
V
01
(***)
V
02
5.4 6 6.6
- 5.4 - 6 - 6.6
- 150 + 150 mV
Sin (B) FTA= FTB = -0.5 V - 9
Multiplier Input Voltage
± 1.25 ± 1.7 V
(pin 7, 8)
Bias Voltage(pin 6) FTAand FTB Floating - 6.5 - 8 V
µA
V
V
p
(°) : FTA= FTB = FTF (° °) : FTA= FTB = FTF =
1V
0
Note : Phase relationshipbetween the signals :
*FTA:0° FTB : 90°
** FTA : 0° FTB : - 90° V
*** FTA : 0° FTB : 90° V
=90° VMB=0°
MA
=90° VMB= 180°
MA
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1V
0
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WAVEFORMS (Neglectingthreshold volage level of thecomparators).
L290
SYSTEM DESCRIPTION : referto the L292 data sheet.
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L290
Figure 1. Complete applicationcircuit.
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Page 7
DIP-16 PLASTIC PACKAGE MECHANICAL DATA
L290
DIM.
MIN. TYP. MAX. MIN. TYP. MAX.
a1 0.51 0.020
B 0.77 1.65 0.030 0.065
b 0.5 0.020
b1 0.25 0.010
D 20 0.787
E 8.5 0.335
e 2.54 0.100
e3 17.78 0.700
F 7.1 0.280
I 5.1 0.201
L 3.3 0.130
Z 1.27 0.050
mm inch
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L290
Information furnished is believed to be accurate and reliable. However, SGS-THOMSON Microelectronics assumes no responsibility for the
consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. No
licenseis granted by implication or otherwise under any patent or patent rights of SGS-THOMSON Microelectronics. Specifications mentioned
in this publication are subject to change without notice. This publication supersedes and replaces all information previously supplied.
SGS-THOMSON Microelectronics products are not authorized for use as critical componentsin life support devices or systems without express
written approval of SGS-THOMSON Microelectronics.
1994 SGS-THOMSON Microelectronics - All Rights Reserved
SGS-THOMSON Microelectronics GROUP OF COMPANIES
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