CS4121 Datasheet, PDF (8/12 Pages) Cherry Semiconductor Corporation – Low Voltage Precision Air-Core Low Voltage Precision Air-Core

CS4121
V_REG
R3
V_C(t)
+
−
FREQ_IN
SQ_OUT
C_CP
R4
+
Q_SQUARE
−
2.0 V
0.25 V
CP+
Q1
2.0 V
+
F/V_OUT
CP−
Q3
−
R_T
F to V
C4
Q2
Figure 7. Partial Schematic of Input and Charge Pump
FREQ_IN ⁰
SQ_OUT
0
V_CC
t_DCHG
V_REG
T
t_CHG
I_CP+
V_CP+
0
600 mV
−0.3 V
Figure 8. Timing Diagram of FREQ_IN and I_CP
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