74HCT9046A Datasheet, PDF (25/43 Pages) NXP Semiconductors – PLL with bandgap controlled VCO

NXP Semiconductors
74HCT9046A
PLL with band gap controlled VCO
f
(MHz)
f₂
f₀
f'₀
f₁
mga937
V
V
min
0.5 V_CC
max
V_{VCO_IN} (V)
f‘₀ = -^f---¹----⁺₂------^f--²-
linearity = ^f---^‘--⁰---_f-^–-₀----^f---⁰ × 100 %
Fig 24. Definition of VCO frequency linearity:
∆V = 0.5 V over the V_CC range
mbd121
1
P_D
(W)
10 ¹
V_CC =
5.5 V
C1 = 1 µF
4.5 V
C1 = 1 µF
5.5 V
C1 = 39 pF
4.5 V
C1 = 39 pF
10 ²
0
100
200 _{R1 (kΩ)} 300
R2 = ∞ Ω
Fig 26. Power dissipation as a function of R1
4
f_VCO
(%)
C1 = 1 µF
4.5 V
5.5 V
0 C1 =
39 pF
4.5 V
−4
mbd114
5.5 V
−8
1
10
10 ² _{R1 (kΩ)} 10³
R2 = ∞ Ω and ∆V = 0.5 V
Fig 25. Frequency linearity as a function of R1, C1 and
V_CC
mbd110
1
P_D
(W)
10 ¹
V_CC =
5.5 V
C1 = 39 pF
4.5 V
C1 = 39 pF
5.5 V
4.5 V
C1 = 1 µF
10 ²
0
100
200 _{R2 (kΩ)} 300
R1 = ∞ Ω
Fig 27. Power dissipation as a function of R2
74HCT9046A_6
Product data sheet
Rev. 06 — 15 September 2009
© NXP B.V. 2009. All rights reserved.
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