CS289 Datasheet, PDF (3/6 Pages) Cherry Semiconductor Corporation – 20mA Air-Core Tachometer Drive Circuit

PACKAGE PIN #
20L SO
14L PDIP
12
9
13
10
18
11
19
12
20
13
14
Package Pin Description: continued
PIN SYMBOL
FUNCTION
S_QOUT
S_QIN
V_REG
V_COS
V_CC
Pwr Gnd
Buffered square wave output signal.
Speed or RPM input signal.
Voltage regulator output.
Cosine output signal.
Supply voltage.
Power Ground connection.
Note 1: V_sine measured V_sine to V_Z. V_COS measured V_COS to V_Z. All other voltages specified are measured to ground.
Note 2: Max PWR dissipation ²V_CC X I_CC - (V₂ I_sine + V12 I_COS).
Typical Performance Characteristics
Output Angle in Polar Form
COSINE
OUTPUT
Ð
+ _{VP COS Q}
Q
V_P SIN Q
+
V_Z
SINE OUTPUT
Ð
Charge Pump Output Voltage
Relationship of EQ, Q and Frequency
7.1
6
5
4
3
2.1
F/V_OUT = 2.0V + FREQ X C_T X R_T X V_REG
0 45û 90û 135û 180û 225û 270û
Frequency/Output Angle (°)
Function Generator Output Voltage
2.1
4.5
3.8 5.45
7.1
3.5
2.5 4.5V
1.5
V_SINE
V_COS
V_Z
-1.5
-2.5
4.5V
-3.5
-4.5
0 45û 90û 135û 180û 225û 270û
Tachometer Angular Deflection (°)
3