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L290

型号：

L290

描述：

转速表转换器[ TACHOMETER CONVERTER ]

品牌：

STMICROELECTRONICS[ ST ]

页数：

8 页

PDF大小：

106 K

下载PDF手册
L290  
TACHOMETER CONVERTER  
DESCRIPTION  
The L290, a monolithic LSI circuit in 16-lead inline  
plastic package,is intendedfor 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.  
DIP-16 Plastic  
(0.25)  
The L290/1/2 system can be directly controlled by  
a microprocessor. The L290 integrates the follow-  
ing functions:  
- tacho voltage generator (F/V converter)  
- reference voltage generator  
- position pulse generator  
ORDER CODE : L290B  
ABSOLUTE MAXIMUM RATING  
Symbol  
Parameter  
Value  
Unit  
V
Vs  
Vi (FTA, FTB, FTF)  
Ptot  
Supply Voltage  
Input Signals  
± 15  
± 7  
1
V
Total Power Dissipation (Tamb = 70°C)  
W
Tstg, Tj  
Storage and Junction Temperature  
- 40 to + 150  
°C  
SYSTEM BLOCK DIAGRAM  
March 1993  
1/8  
L290  
CONNECTION DIAGRAM (top view)  
BLOCK DIAGRAM  
2/8  
L290  
TEST CIRCUIT  
THERMAL DATA  
Symbol  
Parameter  
Thermal resistance junction-case  
Value  
Unit  
Rth-j-amb  
Max  
80  
°C/W  
ELECTRICAL CHARACTERISTICS (Refer to the test circuit, S in (A), Vs = ± 12 V, Tamb = 25 °C  
unless otherwise specified)  
Symbol  
Parameter  
Supply Voltage  
Quiescent Drain Current  
Test conditions  
Min.  
Typ. Max.  
Unit  
V
Vs  
Id  
± 10  
± 15  
Vs = ± 15 V  
13  
20  
mA  
INPUT AMPLIFIERS (A1 and A2)  
FTA, FTB Input Signal from Encoder  
(pin 1, 16)  
fmax = 20 KHz  
± 0.4  
± 0.6  
± 55  
Vp  
Vos  
Output Offset Voltage  
(pin 2, 15)  
FTA= FTB = 0 V  
mV  
Ib  
Input Bias Current (pin 1, 16)  
Voltage Gain  
0.15  
23  
µA  
Gv  
f = 10 KHz FTA=  
22  
24  
dB  
FTB = ± 0.6 Vp  
V0  
Output Voltage Swing  
(pin 2, 15)  
± 9.5  
V
FTA= FTB = ± 1Vp  
3/8  
L290  
ELECTRICAL CHARACTERISTICS (continued)  
Symbol  
Parameter  
Test conditions  
Min.  
Typ.  
Max.  
Unit  
COMPARATORS WITH HYSTERESIS (C1, C2, and C3)  
C1 and C2  
550  
700  
55  
850  
900  
175  
830  
120  
0.4  
mV  
mV  
mV  
mV  
mV  
V
VTHP (°)  
Positive Threshold Voltage  
(pin 2, 12, 15)  
C3  
C1 and C2  
VTHN (° °) Negative Threshold Voltage  
(pin 2, 12, 15)  
C3  
C3  
570  
72  
∆FTF  
Threshold Hysteresis  
VL  
Output Voltage (low level)  
(pin 10, 13, 14)  
I0 = 2 mA  
FTA= FTB = FTF = 0 V  
0.2  
Ileak  
(pins 10, 13, 14)  
FTA= FTB = 0.5 V  
µA  
1
V
CE = 5 V  
FTF = 1 V  
REFERENCE GENERATOR  
Vref  
DC Reference Voltage  
(pin 3)  
FTA= FTB = ± 0.5 Vp (*)  
ref = 1 mA  
4.5  
5
5.5  
1.4  
V
I
Iref  
Output Current (pin 3)  
mA  
”TACHO” AMPLIFIER (A3)  
Vos  
Vo  
Output Offset Voltage (pin 4)  
FTA= ± 15 mV FTB = 0.5V  
± 80  
mV  
V
DC Output Voltage (pin 4)  
FTA= FTB =  
(**)  
V01  
5.4  
6
6.6  
± 0.5 Vp  
VMA = VMB =  
± 1.25 Vp  
(***)  
V02  
- 5.4  
- 6  
- 6.6  
∆V0  
V01 + V02  
- 150  
9
+ 150  
mV  
V
V0  
Output Voltage Swing (pin 4)  
FTA= FTB = 0.5V  
FTA= FTB = -0.5 V  
Sin (B)  
- 9  
VMA  
VMB  
Multiplier Input Voltage  
(pin 7, 8)  
± 1.25  
± 1.7  
Vp  
V
Vbias  
Bias Voltage (pin 6)  
FTAand FTB Floating  
- 6.5  
- 8  
1V  
1V  
(°)  
:
FTA = FTB = FTF  
0
(° °)  
: FTA= FTB = FTF =  
0
Note  
:
Phase relationship between the signals :  
* FTA : 0°  
** FTA : 0°  
*** FTA : 0°  
FTB : 90°  
FTB : - 90°  
FTB : 90°  
VMA = 90°  
VMA = 90°  
VMB = 0°  
VMB = 180°  
4/8  
L290  
WAVEFORMS (Neglecting threshold volage level of the comparators).  
SYSTEM DESCRIPTION : refer to the L292 data sheet.  
5/8  
L290  
Figure 1. Complete application circuit.  
6/8  
L290  
DIP-16 PLASTIC PACKAGE MECHANICAL DATA  
mm  
inch  
TYP.  
DIM.  
MIN.  
0.51  
0.77  
TYP.  
MAX.  
MIN.  
0.020  
0.030  
MAX.  
a1  
B
b
1.65  
0.065  
0.787  
0.5  
0.020  
0.010  
b1  
D
E
e
0.25  
20  
8.5  
2.54  
0.335  
0.100  
0.700  
e3  
F
17.78  
7.1  
5.1  
0.280  
0.201  
I
L
3.3  
0.130  
Z
1.27  
0.050  
7/8  
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  
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.  
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.  
8/8  
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