74HCT9046AD NXP Semiconductors, 74HCT9046AD Datasheet - Page 37

• Manufacturer Part Number: 74HCT9046AD
• Description: Phase Locked Loops (PLL) PHASE LOCKED LOOP W/VCO
• Manufacturer: NXP Semiconductors
• Type: PLLr

Specifications of 74HCT9046AD

• 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: 5 V
• Package / Case: SOIC-16
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 74HCT9046AD,112

NXP Semiconductors
74HCT9046A_6
Product data sheet
Fig 36. Frequency compared to the time response
13.3 Further information
Since the output frequency is proportional to the VCO control voltage, the PLL frequency
response can be observed with an oscilloscope by monitoring pin VCO_IN of the VCO.
The average frequency response, as calculated by the Laplace method, is found
experimentally by smoothing this voltage at pin VCO_IN with a simple RC filter, whose
time constant is long compared with the phase detector sampling rate but short compared
with the PLL response time.
For an extensive description and application example please refer to “ Application note ”
ordering number 9397 750 00078.
proportional
frequency
to output
(MHz)
3.1
2.9
2.1
2.0
1.9
Rev. 06 — 15 September 2009
0
step input
N stepped from 29 to 30
N stepped from 21 to 20
0.5
1.0
1.5
N = 30
time (ms)
2.0
mga952
2.5
PLL with band gap controlled VCO
74HCT9046A
© NXP B.V. 2009. All rights reserved.
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