AD9520-5SLASHPCBZ datasheet(14/80 Pages) AD

14 / 80 page

AD9520-5

Rev. 0 | Page 14 of 80

PD, SYNC, AND RESET PINS

Table 12.

Parameter

Min

Typ

Max

Unit

Test Conditions/Comments

INPUT CHARACTERISTICS

Each of these pins has a 30 kΩ internal pull-up resistor

Logic 1 Voltage

2.0

Logic 0 Voltage

0.8

Logic 1 Current

μA

Logic 0 Current

−110

μA

The minus sign indicates that current is flowing out of

the AD9520, which is due to the internal pull-up resistor

Capacitance

RESET TIMING

Pulse Width Low

RESET Inactive to Start of Register Programming

100

SYNC TIMING

Pulse Width Low

1.3

High speed clock is CLK input signal

SERIAL PORT SETUP PINS: SP1, SP0

Table 13.

Parameter

Min

Typ

Max

Unit

Test Conditions/Comments

SP1, SP0

These pins do not have internal pull-up/pull-down resistors

Logic Level 0

0.25 × VS

VS is the voltage on the VS pin

Logic Level ½

0.4 × VS

0.65 × VS

User can float these pins to obtain Logic Level ½; if floating this pin, user

should connect a capacitor to ground

Logic Level 1

0.8 × VS

LD, STATUS, AND REFMON PINS

Table 14.

Parameter

Min

Typ

Max

Unit

Test Conditions/Comments

OUTPUT CHARACTERISTICS

When selected as a digital output (CMOS); there are other

modes in which these pins are not CMOS digital outputs;

see Table 48, 0x017, 0x01A, and 0x01B

Output Voltage High, VOH

2.7

Output Voltage Low, VOL

0.4

MAXIMUM TOGGLE RATE

100

MHz

Applies when mux is set to any divider or counter output

or PFD up/down pulse; also applies in analog lock detect

mode; usually debug mode only; beware that spurs can

couple to output when any of these pins is toggling

ANALOG LOCK DETECT

Capacitance

On-chip capacitance; used to calculate RC time constant

for analog lock detect readback; use a pull-up resistor

REF1, REF2, AND CLK FREQUENCY STATUS MONITOR

Normal Range

1.02

MHz

Frequency above which the monitor indicates the

presence of the reference

Extended Range

kHz

Frequency above which the monitor indicates the

presence of the reference

LD PIN COMPARATOR

Trip Point

1.6

Hysteresis

260

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