AD9553SLASHPCBZ datasheet(5/44 Pages) AD

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AD9553

Rev. 0 | Page 5 of 44

VCO CHARACTERISTICS

Table 6.

Parameter

Min

Typ

Max

Unit

Test Conditions/Comments

FREQUENCY RANGE

3350

4050

MHz

VCO GAIN

MHz/V

VCO TRACKING RANGE

±300

ppm

VCO CALIBRATION TIME

As measured from completion of the VCO calibration

command (the rising edge of CS (Pin 12)) until the rising

edge of LOCKED (Pin 20).

Low BW Setting (170 Hz)

Applies for A[3:0] = 0001 to 1100 or for A[3:0] = 1111.

13.3 kHz PFD Frequency

214

16 kHz PFD Frequency

176

High BW Setting (75 kHz)

Applies for A[3:0] = 1101 to 1110.

2.64 MHz PFD Frequency

1.46

4.86 MHz PFD Frequency

0.80

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 BW Setting (170 Hz)

Applies for A[3:0] = 0001 to 1100 or for A[3:0] = 1111.

13.3 kHz PFD Frequency

214

16 kHz PFD Frequency

176

High BW Setting (75 kHz)

Applies for A[3:0] = 1101 to 1110.

2.64 MHz PFD Frequency

1.50

4.86 MHz PFD Frequency

0.89

CRYSTAL INPUT CHARACTERISTICS

Table 7.

Parameter

Min

Typ

Max

Unit

Test Conditions/Comments

CRYSTAL FREQUENCY

Range

MHz

When using the pin selected frequency settings, the device

requires a 25 MHz crystal to support holdover functionality.

Tolerance

ppm

CRYSTAL MOTIONAL RESISTANCE

100

CRYSTAL LOAD CAPACITANCE

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.

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