CD74HC7046AM datasheet(17/26 Pages) TI

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FIGURE 32. HC7046A AND HCT7046A OFFSET FREQUENCY

vs R2, C1

FIGURE 33. HC7046A fMIN/fMAX vs R2/R1

FIGURE 34. HCT7046A fMAX/fMIN vs R2/R1

FIGURE 35. DEFINITION OF VCO FREQUENCY LINEARITY

FIGURE 36. HC7046A VCO LINEARITY vs R1

FIGURE 37. HC7046A VCO LINEARITY vs R1

Typical Performance Curves (Continued)

110

102

103

104

105

106

CAPACITANCE, C1 (pF)

108

107

106

105

104

103

102

R2 = 3K

R2 = 30K

R2 = 300K

R2 = 3M

R2 = 15M

VCOIN = GND

HC - VCC = 6V

HCT - VCC = 5.5V

VCOIN = VCC - 0.9V FOR fMAX

VCOIN = 0V FOR fMIN

VCC = 3V, 4.5V, 6V

102

10-2

10-1

R2/R1

102

VCOIN = VCC - 0.9V FOR fMAX

VCOIN = 0V FOR fMIN

VCC = 4.5V TO 5.5V

102

10-2

10-1

R2/R1

102

f0’

∆V

1/2VCC

VVCOIN

MIN

MAX

∆V

∆V = 0.5V OVER THE VCC RANGE:

FOR VCO LINEARITY

f’o = f1 + f2

LINEARITY =

f’o - fo

f’o

x 100%

10K

100K

10M

R1 (OHMS)

-2

-4

-6

-8

VCOIN = 2.25V ± 1V

C1 = 50pF

VCC = 4.5V

R2 =

∞

VCOIN = 2.25V ± 0.45V

10K

100K

10M

R1 (OHMS)

-2

-4

-6

-8

VCOIN = 1.50V ± 0.4V

C1 = 50pF

VCC = 3V

R2 =

∞

VCOIN = 1.50V ± 0.3V

CD74HC7046A, CD74HCT7046A

CD74HC7046AM 数据表(PDF) 17 Page - Texas Instruments

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