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Data Sheet

AD9531

PLL3 CHARACTERISTICS

PLL3 Reference Input (REF3_x)

Table 27.

Parameter

Min

Typ

Max

Unit

Test Conditions/Comments

REFERENCE INPUT PATH

Input Frequency Range

9.5

100

MHz

Input Sensitivity

200

mV p-p

Minimum Input Slew Rate

100

V/μs

Minimum limit imposed for jitter performance

Common-Mode, Internally

Generated Bias Voltage

1.16

Hysteresis

Differential Input Capacitance

Differential Input Resistance

4.1

kΩ

Duty Cycle

Required for input frequencies below 20 MHz when using a

frequency scale factor of either 2 or 2/3

CRYSTAL MOTIONAL RESISTANCE

100

Ω

Use a fundamental mode AT-cut crystal when operating REF3_x as a

crystal resonator input

PLL3 Outputs OUT3_0

Table 28.

Parameter

Min

Typ

Max

Unit

Test Conditions/Comments

1.8 V SUPPLY (CMOS)

Output Frequency

150

MHz

10 pF load

Rise/Fall Time (20% to 80%)

1.0

10 pF load; listed value is for the edge (rising or falling) with the

lesser rate of change (|δv/δt|)

Duty Cycle

10 pF load

Output Voltage High (VOH)

VDD − 0.2

Relative to VDD3_01 (Pin 66) with output driver static and IOH = 1 mA

Output Voltage Low (VOL)

0.2

Output driver static and IOL = 1 mA

3.3 V SUPPLY (CMOS)

Output Frequency

200

MHz

10 pF load

Rise/Fall Time (20% to 80%)

0.7

10 pF load; listed value is for the edge (rising or falling) with the

lesser rate of change (|δv/δt|)

Duty Cycle

10 pF load

Output Voltage High (VOH)

VDD − 0.2

Relative to VDD3_3V3 (Pin 67) with output driver static and IOH = 1 mA

Output Voltage Low (VOL)

0.2

Output driver static and IOL = 1 mA

PLL3 Outputs (OUT3_1x)

Table 29.

Parameter

Min

Typ

Max

Unit

Test Conditions/Comments

HSTL MODE

Output Frequency

400

MHz

Rise/Fall Time (20% to 80%)

120

170

100 Ω termination across the output pins; listed values are for the

edge (rising or falling) with the lesser rate of change (|δv/δt|)

Duty Cycle

Differential Output Voltage

Swing

925

Magnitude of voltage across the pins; output driver static

Common-Mode Output

Voltage

850

Output driver static

Rev. 0 | Page 17 of 88

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