CS4121 Datasheet, PDF (7/8 Pages) Cherry Semiconductor Corporation – Low Voltage Precision Air-Core Low Voltage Precision Air-Core

Speedometer/Odometer or Tachometer Application
Speedo
Input
R2
R3
R4
C_T
C3
Battery
D1 R1
D2
C1
1 CCPP++
2 SQ_OUT
3 FREQIN
4 Gnd
5 Gnd
6 COS+
7 COS-
8 VCC
CP- 16
F/V_OUT 15
V_REG 14
Gnd 13
Gnd 12
SINE+ 11
SINE- 10
BIAS 9
C4+
R_T
COSINE
SINE
Gnd
Air Core
Gauge
200W
Speedometer
Figure 6
R1 - 3.9, 500mW
R2 - 10k½
R3 - 3k½
R4 - 1k½
R_T - Trim Resistor +/- 20 PPM/¡C 243k½
C1 - 0.1µF
C3 - 0.1µF
C4 - 0.47µF
C_T - 0.0033µF, +/- 30 PPM/¡C
D1 - 1A, 600 PIV
D2 - 50V, 500mW Zener
Note 1: For 58% Speed Input T_MAX ² 5/f_MAX where
T_MAX = C_T(R3+R4)
f_MAX = maximum speed input frequency
Speedo
Input
R2
R3
R4
C_T
C3
Battery
D1 R1
D2 C1
1 CCPP++
2 SQOUT
3 FREQIN
4 Gnd
5 Gnd
6 COS+
7 COS-
8 VCC
CP- 16
F/V_OUT 15
V_REG 14
Gnd 13
Gnd 12
SINE+ ₁₁
SINE- 10
BIAS 9
C4+
R_T
COSINE
SINE
Gnd
Air Core
Gauge
200W
Speedometer
C2
1
CS8441
Figure 7
Note 1: The product of C_T and R_T have a direct effect on
gain and therefore directly affect temperature compensation
Note 2: C_T Range; 20pF to .2µF
Note 3: R_T Range; 100k½ to 500k½
Air Core
Stepper Motor
200W
Odometer
Note 4: The IC must be protected from transients above 60V and
reverse battery conditions
Note 5: Additional filtering on FREQ_IN lead may be required
7