CS4121 Datasheet, PDF (9/12 Pages) Cherry Semiconductor Corporation – Low Voltage Precision Air-Core Low Voltage Precision Air-Core

CS4121
R3
Speedo Input
3.0 kW
C_CP
0.0033 mF
± 30 PPM/°C
R2
R4
1.0 kW
10 kW _{C3 0.1 mF}
1 CP+
CP−
SQ_OUT ^F/VOUT
FREQ_IN VREG
GND
GND
C4 ₊
GND
GND
COS+ ^SINE+
Battery
R1
D1
3.9,
1.0 A ^{500 mW}
600 PIV
GND
0.1 mF
D2
C1
50 V,
500 mW
Zener
COS−
V_CC
COSINE
SINE−
BIAS
SINE
0.47 mF
Air Core
Gauge
200 W
Speedometer
Trim Resistor
R_T ± 20 PPM/°C
243 kW
Notes:
1. For 58% Speed Input T_MAX ≤ 5.0/f_MAX where
T_MAX = C_CP (R3 + R4)
f_MAX = maximum speed input frequency
2. The product of C4 and R_T have a direct effect on gain and therefore directly affect temperature compensation.
3. C_CP Range; 20 pF to 0.2 mF.
4. R_T Range; 100 kW to 500 kW.
5. The Ic must be protected from transients above 60 V and reverse battery conditions.
6. Additional filtering on FREQ_IN lead may be required.
7. Gauge coil connections to the IC must be kept as short as possible (≤ 3.0 inch) for best pointer stability.
Figure 9. Speedometer or Tachometer Application
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