Datasheet

AD9553

Rev. A | Page 5 of 44

VCO CHARACTERISTICS

Table 6.

Parameter Min Typ Max Unit Test Conditions/Comments

FREQUENCY RANGE 3350 4050 MHz

VCO GAIN 45 MHz/V

VCO TRACKING RANGE ±300 ppm

VCO CALIBRATION TIME As measured from completion of the VCO calibration command

(the rising edge of

(Pin 12)) until the rising edge of LOCKED (Pin 20)

Low Bandwidth Setting (170 Hz) Applies for Pin A3 to Pin A0 = 0001 to 1100, or for Pin A3 to

Pin A0 = 1111

13.3 kHz PFD Frequency 214 ms

16 kHz PFD Frequency 176 ms

Medium Bandwidth Setting (20 kHz) Applies for Pin A3 to Pin A0 = 1110 and Pin Y5 to Pin Y0 = 111111

1.5625 MHz PFD Frequency 1.82 ms

High Bandwidth Setting (75 kHz) Applies for Pin A3 to Pin A0 = 1101 to 1110

2.64 MHz PFD Frequency 1.46 ms

4.86 MHz PFD Frequency 0.80 ms

PLL LOCK TIME Using the pin selected frequency settings; lock time is from the

rising edge of the

RESET

pin to the rising edge of the LOCKED pin

Low Bandwidth Setting (170 Hz) Applies for Pin A3 to Pin A0 = 0001 to 1100 or for Pin A3 to

Pin A0 = 1111

13.3 kHz PFD Frequency 214 ms

16 kHz PFD Frequency 176 ms

Medium Bandwidth Setting (20 kHz) Applies for Pin A3 to Pin A0 = 1110 and Pin Y5 to Pin Y0 = 111111

1.5625 MHz PFD Frequency 2 ms

High Bandwidth Setting (75 kHz) Applies for Pin A3 to Pin A0 = 1101 to 1110

2.64 MHz PFD Frequency 1.50 ms

4.86 MHz PFD Frequency 0.89 ms

CRYSTAL INPUT CHARACTERISTICS

Table 7.

Parameter Min Typ Max Unit Test Conditions/Comments

CRYSTAL FREQUENCY

Range 10 25 52 MHz When using the pin selected frequency settings, the device

requires a 25 MHz crystal to support holdover functionality

Tolerance 20 ppm

CRYSTAL MOTIONAL RESISTANCE 100 Ω

CRYSTAL LOAD CAPACITANCE 10 pF Using a crystal with a specified load capacitance other than 10 pF

(8 pF to 24 pF) is possible, but necessitates using the SPI port to

alter the default register values for load capacitance