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AD9550

Rev. 0 | Page 4 of 20

Parameter

Min

Typ

Max

Unit

Test Conditions/Comments

×2 Frequency Multiplier

125

MHz

To avoid excessive reference spurs, the ×2 multiplier

requires 48% to 52% duty cycle; reference clock input

frequencies greater than 125 MHz require the use of

the divide-by-5 prescaler

VCO CHARACTERISTICS

Frequency Range

3350

4050

MHz

VCO Gain

MHz/V

VCO Tracking Range

±300

ppm

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

16 kHz PFD Frequency

176

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

High Bandwidth Setting (75 kHz)

Applies for Pin A3 to Pin A0 = 1101 to 1110

2.64 MHz PFD Frequency

1.50

4.86 MHz PFD Frequency

0.89

1 The A3 to A0 and Y5 to Y0 pins have 100 kΩ internal pull-up resistors. The OM2 to OM0 pins have 40 kΩ pull-up resistors.

2 The RESET pin has a 100 kΩ internal pull-up resistor.

OUTPUT CHARACTERISTICS

Table 2.

Parameter

Min

Typ

Max

Unit

Test Conditions/Comments

LVPECL MODE

Differential Output Voltage Swing

690

800

890

Output driver static (for dynamic performance see

Figure 15)

Common-Mode Output Voltage

VDD − 1.66 VDD − 1.34 VDD − 1.01 V

Output driver static

Frequency Range

810

MHz

Duty Cycle

Up to 805 MHz output frequency

Rise/Fall Time1 (20% to 80%)

255

305

100 Ω termination between both pins of the output driver

LVDS MODE

Differential Output Voltage Swing

Output driver static (for dynamic performance see

Figure 15)

Balanced, V

297

398

Voltage swing between output pins; output driver static

Unbalanced, ΔV

8.3

Absolute difference between voltage swing of normal

pin and inverted pin; output driver static

Offset Voltage

Common Mode, V

1.17

1.35

Output driver static

Common-Mode Difference, ΔV

7.3

Voltage difference between output pins; output driver

static

Short-Circuit Output Current

Frequency Range

810

MHz

Duty Cycle

Up to 805 MHz output frequency

Rise/Fall Time1 (20% to 80%)

285

355

100 Ω termination between both pins of the output

driver

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