74HCT4046AD,112 NXP Semiconductors, 74HCT4046AD,112 Datasheet - Page 25

• Manufacturer Part Number: 74HCT4046AD,112
• Description: IC PHASE LOCK LOOP W/VCO 16SOIC
• Manufacturer: NXP Semiconductors
• Type: Phase Lock Loop (PLL)r
• Series: 74HCTr

Specifications of 74HCT4046AD,112

• Number Of Circuits: 1
• Package / Case: 16-SOIC (3.9mm Width)
• Pll: Yes
• Input: Clock
• Output: Clock
• Ratio - Input:output: 2:3
• Differential - Input:output: No/No
• Frequency - Max: 19MHz
• Divider/multiplier: No/No
• Voltage - Supply: 4.5 V ~ 5.5 V
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Frequency-max: 19MHz
• Supply Voltage (max): 5.5 V
• Supply Voltage (min): 4.5 V
• Maximum Operating Temperature: + 125 C
• Minimum Operating Temperature: - 40 C
• Input Level: CMOS
• Mounting Style: SMD/SMT
• Operating Supply Voltage: 4.5 V to 5.5 V
• Output Level: CMOS
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant
• Other names: 568-1547-5; 74HCT4046AD; 933809570112

Philips Semiconductors
APPLICATION INFORMATION
This information is a guide for the approximation of values of external components to be used with the 74HC/HCT4046A
in a phase-lock-loop system.
References should be made to Figs 29, 30 and 31 as indicated in the table.
Values of the selected components should be within the following ranges:
R1
R2
R1 + R2 parallel value
C1
1997 Nov 25
SUBJECT
VCO frequency
without extra
offset
Phase-locked-loop with VCO
between 3 k and 300 k ;
between 3 k and 300 k ;
greater than 40 pF.
PHASE
COMPARATOR
PC1, PC2 or PC3
PC1
PC2 or PC3
2.7 k ;
DESIGN CONSIDERATIONS
VCO frequency characteristic
With R2 =
characteristics of the VCO operation will be as shown in Fig.25.
(Due to R1, C1 time constant a small offset remains when R2 = .).
Fig.25 Frequency characteristic of VCO operating without offset:
f
Selection of R1 and C1
Given f
Given f
Fig.31 to obtain 2f
0
= centre frequency; 2f
max
o
, determine the values of R1 and C1 using Fig.29.
and f
25
and R1 within the range 3 k
o
, determine the values of R1 and C1 using Fig.29, use
L
and then use this to calculate f
L
= frequency lock range.
74HC/HCT4046A
R1
300 k , the
min
Product specification
.