74HCT4046ADB NXP Semiconductors, 74HCT4046ADB Datasheet - Page 27

• Manufacturer Part Number: 74HCT4046ADB
• Description: Phase Locked Loops (PLL) PHASE LOCKED LOOP W/VCO
• Manufacturer: NXP Semiconductors
• Type: PLLr

Specifications of 74HCT4046ADB

• Number Of Circuits: 1
• Supply Voltage (max): 5.5 V
• Supply Voltage (min): 4.5 V
• Maximum Operating Temperature: + 125 C
• Minimum Operating Temperature: - 40 C
• Mounting Style: SMD/SMT
• Operating Supply Voltage: 4.5 V to 5.5 V
• Package / Case: SSOP-16
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 74HCT4046ADB,112

Philips Semiconductors
1997 Nov 25
SUBJECT
PLL frequency
PLL locks on
noise rejection at
AC ripple content
capture range
signal input
when PLL is
locked
Phase-locked-loop with VCO
harmonics at
centre frequency
PHASE
COMPARATOR
PC1, PC2 or PC3
PC1 or PC3
PC2
PC1
PC2 or PC3
PC1
PC2
PC3
DESIGN CONSIDERATIONS
Loop filter component selection
A small capture range (2f
yes
no
high
low
f
f
f
r
r
r
(a) 1 = R3 x C2; (b) amplitude characteristic (c) pole-zero diagram
= 2f
= f
= f
(a)
i
i
, small ripple content at
, large ripple content at
Fig.28 Simple loop filter for PLL with offset; R3 + R4
i
Fig. 27 Simple loop filter for PLL without offset; R3 500 .
, large ripple content at
2 = R4 x C2;
3 = (R3 + R4) x C2
= R3 x C2 (b) amplitude characteristic (c) pole-zero diagram
27
c
) is obtained if
DEMOUT
DEMOUT
DEMOUT
= 180
= 0
= 90
2f
c
74HC/HCT4046A
1
-- - 2 f
Product specification
L
500 .