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L290-L290B
TACHOMETER CONVERTER
L290TACHOMETER CONVERTER
DESCRIPTIONThe L290,a monolithic LSI circuitin 16-lead inline
plastic package,is intendedfor user with the L291
and L292 which together froma complete
3-chip motor positioning system for applications
such as carriage/daisy-wheel position controlin
typewriters.
The L290/1/2 system canbe directly controlledby microprocessor. The L290 integratesthe follow-
ing functions: tacho voltage generator (F/V converter) referencevoltage generator position pulse generator
Symbol Parameter Value Unit Supply Voltage ±15 V (FTA,FTB, FTF) Input Signals ± 7V
Ptot Total Power Dissipation (Tamb=70°C) 1 W
Tstg,Tj Storage and Junction Temperature -40to+ 150 °C
ABSOLUTE MAXIMUM RATING
SYSTEM BLOCK DIAGRAM
DIP-16 Plastic(0.25)
ORDER CODE: L290B
BLOCKDIAGRAM
CONNECTION DIAGRAM (top view)
L290
Symbol Parameter Value UnitRth-j-amb Thermal resistance junction-case Max 80 °C/W
THERMAL DATA
Symbol Parameter Test conditions Min. Typ. Max. Unit Supply Voltage ±10 ±15 V Quiescent Drain Current Vs=±15V 13 20 mA
INPUT AMPLIFIERS (A1 and A2)
FTA, FTB Input Signal from Encoder
(pin1, 16)
fmax=20 KHz ± 0.4 ± 0.6 Vp
Vos Output OffsetVoltage
(pin2, 15)
FTA= FTB=0V ±55 mV Input Bias Current (pin1, 16) 0.15 μA Voltage Gain f =10 KHz FTA=
FTB=± 0.6Vp 23 24 dB Output Voltage Swing
(pin2, 15) FTA= FTB=± 1Vp ±9.5 V
ELECTRICALCHARACTERISTICS (Referto the test circuit,Sin (A),Vs=±12V, Tamb =25°C
unless otherwise specified)
TEST CIRCUIT
L290
Symbol Parameter Test conditions Min. Typ. Max. Unit
COMPARATORS WITH HYSTERESIS (C1,C2, and C3)
VTHP(°) Positive Threshold Voltage
(pin2, 12,15) andC2 550 850 mV 700 900 mV
VTHN (° °) Negative Threshold Voltage
(pin2, 12,15) andC2 55 175 mV 570 830 mV
ΔFTF Threshold Hysteresis C3 72 120 mV Output Voltage (low level)
(pin 10,13, 14) =2 mA
FTA= FTB= FTF=0V
0.2 0.4 V
Ileak (pins10, 13,14) FTA= FTB=0.5V
VCE=5V FTF=1V 1 μA
REFERENCE GENERATORVref DC Reference Voltage
(pin3)
FTA= FTB=±0.5Vp(*)
Iref=1 mA
4.5 5 5.5 V
Iref Output Current (pin3) 1.4 mA
”TACHO” AMPLIFIER (A3)
Vos Output Offset Voltage (pin4) FTA=±15 mV FTB= 0.5V ±80 mV DC Output Voltage (pin4) FTA= FTB=0.5Vp
(**)
V01 5.4 6 6.6
VMA= VMB= 1.25Vp
(***)
V02 -5.4 -6 -6.6
ΔV0 V01 +V02 - 150 + 150 mV Output Voltage Swing (pin4) FTA= FTB= 0.5V 9 V
Sin(B) FTA= FTB= -0.5V -9
VMA
VMB
Multiplier Input Voltage
(pin7,8) 1.25 ±1.7 Vp
Vbias Bias Voltage(pin6) FTAand FTB Floating -6.5 -8 V
ELECTRICALCHARACTERISTICS (continued)
(°) : FTA= FTB= FTF (° °) : FTA= FTB= FTF=
Note: Phase relationship betweenthe signals:
*FTA:0° FTB: 90° FTA:0° FTB:- 90° VMA =90° VMB =0°
*** FTA:0° FTB: 90° VMA =90° VMB= 180°
L290
VEFORMS (Neglecting threshold volage levelof the comparators).
SYSTEM DESCRIPTION: referto the L292 data sheet.
L290
Figure1. Complete application circuit.
L290
