L290.pdf part of SGS-Thomson L290 L290.pdf, Tachometer converter text manual preview

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L290
TACHOMETER CONVERTER
DESCRIPTION The L290, a monolithic LSI circuit in 16-lead inline plastic package, is intended for user with the 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. The L290/1/2 system can be directly controlled by a microprocessor. The L290 integrates the following functions: - tacho voltage generator (F/V converter) - reference voltage generator - position pulse generator ABSOLUTE MAXIMUM RATING
Symbol Vs Vi (FTA, FTB, FTF) Ptot Tstg , Tj Supply Voltage Input Signals Total Power Dissipation (Tamb = 70 °C) Storage and Junction Temperature Parameter Value ą 15 ą7 1 - 40 to + 150 Unit V V W °C

DIP-16 Plastic (0.25)

ORDER CODE : L290B

SYSTEM BLOCK DIAGRAM

March 1993

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L290
CONNECTION DIAGRAM (top view)

BLOCK DIAGRAM

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L290
TEST CIRCUIT

THERMAL DATA
Symbol R th-j-amb Parameter Thermal resistance junction-case Max Value 80 Unit °C/W

ELECTRICAL CHARACTERISTICS (Refer to the test circuit, S in (A), Vs = ą 12 V, Tamb = 25 °C unless otherwise specified)
Symbol Vs Id Parameter Supply Voltage Quiescent Drain Current Vs = ą 15 V Test conditions Min. ą 10 13 Typ. Max. ą 15 20 Unit V mA

INPUT AMPLIFIERS (A1 and A2)
FTA, FTB Vos Ib Gv V0 Input Signal from Encoder (pin 1, 16) Output Offset Voltage (pin 2, 15) Input Bias Current (pin 1, 16) Voltage Gain Output Voltage Swing (pin 2, 15) f = 10 KHz FTA= FTB = ą 0.6 Vp FTA = FTB = ą 1Vp 22 ą 9.5 fmax = 20 KHz FTA = FTB = 0 V 0.15 23 24 ą 0.4 ą 0.6 ą 55 Vp mV ľA dB V

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ELECTRICAL CHARACTERISTICS (continued)
Symbol Parameter Test conditions Min. Typ. Max. Unit

COMPARATORS WITH HYSTERESIS (C1, C2, and C3)
VTHP (°) VTHN (° °) FTF VL Ileak Positive Threshold Voltage (pin 2, 12, 15) Negative Threshold Voltage (pin 2, 12, 15) Threshold Hysteresis Output Voltage (low level) (pin 10, 13, 14) (pins 10, 13, 14) C1 and C 2 C3 C1 and C 2 C3 C3 I0 = 2 mA FTA = FTB = FTF = 0 V FTA = FTB = 0.5 V VCE = 5 V FTF = 1 V 550 700 55 570 72 0.2 850 900 175 830 120 0.4 1 mV mV mV mV mV V ľA

REFERENCE GENERATOR
Vref Iref DC Reference Voltage (pin 3) Output Current (pin 3) FTA = FTB = ą 0.5 Vp (*) Iref = 1 mA 4.5 5 5.5 1.4 V mA

"TACHO" AMPLIFIER (A3)
Vos Vo Output Offset Voltage (pin 4) DC Output Voltage (pin 4) FTA = ą 15 mV FTA = FTB = ą 0.5 Vp VMA = VMB = ą 1.25 Vp V0 V0 Output Voltage Swing (pin 4) Sin (B) VMA VMB Vbias Multiplier Input Voltage (pin 7, 8) Bias Voltage (pin 6) FTA and FTB Floating - 6.5 1V 0 V01 + V02 FTA = FTB = 0.5V FTA = FTB = -0.5 V FTB = 0.5V (**) V01 (***) V02 5.4 - 5.4 - 150 9 -9 ą 1.25 ą 1.7 -8 Vp V 6 -6 ą 80 6.6 V - 6.6 + 150 mV V mV

(°) Note

: FTA = FTB = FTF

1V (° °) 0 : Phase relationship between the signals : * FTA : 0° FTB : 90° ** FTA : 0° FTB : - 90° VMA = 90° *** FTA : 0° FTB : 90° VMA = 90°

: FTA= FTB = FTF =

VMB = 0° VMB = 180°

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L290
WAVEFORMS (Neglecting threshold volage level of the comparators).

SYSTEM DESCRIPTION : refer to the L292 data sheet.

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Figure 1. Complete application circuit.

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L290
DIP-16 PLASTIC PACKAGE MECHANICAL DATA
DIM. MIN. a1 B b b1 D E e e3 F I L Z 3.3 1.27 8.5 2.54 17.78 7.1 5.1 0.130 0.050 0.51 0.77 0.5 0.25 20 0.335 0.100 0.700 0.280 0.201 1.65 mm TYP. MAX. MIN. 0.020 0.030 0.020 0.010 0.787 0.065 inch TYP. MAX.

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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 license is 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 components in life support devices or systems without express written approval of SGS-THOMSON Microelectronics. Š 1994 SGS-THOMSON Microelectronics - All Rights Reserved SGS-THOMSON Microelectronics GROUP OF COMPANIES Australia - Brazil - France - Germany - Hong Kong - Italy - Japan - Korea - Malaysia - Malta - Morocco - The Netherlands - Singapore Spain - Sweden - Switzerland - Taiwan - Thaliand - United Kingdom - U.S.A.

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