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Número de pieza | IL8190 | |
Descripción | PRECISION AIR - CORE TACH / SPEEDO DRIVER | |
Fabricantes | IK Semicon | |
Logotipo | ||
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No Preview Available ! TECHNICAL DATA
PRECISION AIR - CORE TACH / SPEEDO DRIVER
WITH RETURN TO ZERO
IL8190
DESCRIPTION
The IL8190 is specifically designed for use with air–
core meter movements. The IC provides all the functions
necessary for an analog tachometer or speedometer. The
IL8190 takes a speed sensor input and generates sine
and cosine related output signals to differentially drive an
air–core meter.
FEATURES
Direct Sensor Input
High Output Torque
Low Pointer Flutter
High Input Impedance
Overvoltage Protection
Return to Zero
DIP-16
ORDERING INFORMATION
IL8190N Plastic DIP
IL8190DW SOIC
TA = -40 to 105 C
Device
IL8190N
IL8190DW
IL8190DWT
ORDERING INFORMATION
Operating Temperature
Range
Package
DIP-16
TA = -40 to 105 C
SOP-20
SOP-20
Packing
Tube
Tube
T&R
PIN ASSIGNMENT
SOP-20
December, 2012, Rev. 02
1 page IL8190
ELECTRICAL CHARACTERISTICS (continued)
(-40°C ≤ TA ≤ 85°C, 8.5 V ≤ VCC ≤ 16 V, unless otherwise specified)
Symbol
Parameter
Test Condition
Min Typ Max
Function Generator Section: –40°C ≤ TA ≤ 85°C, VCC = 13.1 V unless otherwise noted
VCC-TH1 Return to Zero Threshold TA = 25°C
5.2 6.0 7.0
V(COS+-COS-)
Differential Drive Voltage
(VCOS+ – VCOS–)
8.5 V ≤ VCC ≤ 16 V, = 0°
5.5
6.5
7.5
V (SIN+-SIN-)
Differential Drive Voltage
(VSIN+ – VSIN–)
8.5 V ≤ VCC ≤ 16 V, = 90°
5.5
6.5
7.5
V (COS+-COS-)
Differential Drive Voltage
(VCOS+ – VCOS–)
8.5 V ≤ VCC ≤ 16 V,
= 180°
–7.5 -6.5 –5.5
V (SIN+-SIN-)
Differential Drive Voltage
(VSIN+ – VSIN–)
8.5 V ≤ VCC ≤ 16 V,
= 270°
–7.5 -6.5 –5.5
IOUT Differential Drive Current 8.5 V ≤ VCC ≤ 16 V
– 33 42
Zero Hertz Output Angle
-1.5 0 1.5
Function Generator Error
(Note 3) Reference
Figures 1, 2, 3, 4
VCC = 13.1 V
= 0° to 305°
-2.0 0 +2.0
Function Generator Error 13.1 V ≤ VCC ≤ 16 V
-2.5 0 +2.5
Function Generator Error
Function Generator Error
Function Generator Error
Function Generator Error
Function Generator Error
13.1 V ≤ VCC ≤ 11 V
13.1 V ≤ VCC ≤ 9.0 V
25°C ≤ TA ≤ 80°C
25°C ≤ TA ≤ 105°C
-40°C ≤ TA ≤ 25°C
-1.0 0 +1.0
-3.0 0 +3.0
-3.0 0 +3.0
-5.5 0 +5.5
-3.0 0 +3.0
/V Function Generator Gain TA = 25°C, vs VOUT/F
60 77 95
Notes:
1. Input is clamped by an internal 12 V Zener.
2. Applies to % of full scale (270°).
3. Deviation from nominal per Table 1 after calibration at 0° and 270°.
Unit
V
V
V
V
V
mA
deg
deg
deg
deg
deg
deg
deg
deg
°/V
December, 2012, Rev. 02
5 Page IL8190
DESIGN EXAMPLE
Maximum meter Deflection = 270
Maximum Input Frequency = 350 Hz
1. Select RT and CCP
= 970 FREQ CCP RT = 270°
Let CCP = 0.0033 F, find RT
RT
270
970 350Hz 0.0033 μF
RT = 243 k
RT should be a 250 k potentiometer to trim out
any inaccuracies due to IC tolerances or meter
movement pointer placement.
2. Select R3 and R4
Resistor R3 sets the output current from the
voltage regulator. The maximum output current
from the voltage regulator is 10 mA. R3 must
ensure that the current does not exceed this limit.
Choose R3 = 3.3 k
The charge current for CCP is
VREG - 0.7 V 1.90 mA
3.3 k
CCP must charge and discharge fully during each
cycle of the input signal. Time for one cycle at
maximum frequency is 2.85 ms. To ensure that
CCP is charged, assume that the (R3 + R4) CCP
time constant is less than 10% of the minimum
input period.
T 10% 1 285 μs
350 Hz
Choose R4 = 1.0 k.
Discharge time:
tDCHG = R3 CCP = 3.3 k 0.0033 F = 10.9 s
Charge time:
tCHG = (R3 + R4)CCP = 4.3 k 0.0033 F = 14.2
s
3. Determine C4
C4 is selected to satisfy both the maximum
allowable ripple voltage and response time of the
meter movement.
C4
CCP(VREG 0.7V)
ΔVMAX
With C4 = 0.47 F, the V/F ripple voltage is 44
mV.
The last component to be selected is the return
to zero capacitor C2. This is selected by
increasing the input signal frequency to its
maximum so the pointer is at its maximum
deflection, then removing the power from the
circuit. C2 should be large enough to ensure that
the pointer always returns to the 0 position rather
than 360 under all operating conditions.
Figure 11 shows how the IL8190 and the
CS8441 are used to produce a Speedometer and
Odometer circuit.
In some cases a designer may wish to use the
IL8190 only as a driver for an air–core meter
having performed the V/F conversion elsewhere in
the circuit.
Figure 9 shows how to drive the IL8190 with a
DC voltage ranging from 2.0 V to 6.0 V. This is
accomplished by forcing a voltage on the VOUT/F
lead. The alternative scheme shown in Figure 10
uses an external op amp as a buffer and operates
over an input voltage range of 0 V to 4.0 V.
100 k
VREG
IL8190N
CP-
10 k
N/C
+
BIAS
VIN
2.0 V to 6.0 V DC
VOUT/F
Figure 9. Driving the IL8190 from an External
DC Voltage
Figures 9 and 10 are not temperature
compensated.
100 k
IL8190N
BIAS
+
100 k
VIN
0 V to 4.0 V DC
+
10 k
CP-
VOUT/F
100 k
100 k
Figure 10. Driving the IL8190 from an External
DC Voltage Using an Op Amp Buffer
December, 2012, Rev. 02
11 Page |
Páginas | Total 13 Páginas | |
PDF Descargar | [ Datasheet IL8190.PDF ] |
Número de pieza | Descripción | Fabricantes |
IL8190 | PRECISION AIR - CORE TACH / SPEEDO DRIVER | IK Semicon |
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