AD9520-1SLASHPCBZ datasheet(15/80 Pages) AD

15 / 80 page

Data Sheet

AD9520-1

Rev. B | Page 15 of 80

PD, EEPROM, RESET, AND SYNC PINS

Table 15.

Parameter

Min

Typ

Max

Unit

Test Conditions/Comments

INPUT CHARACTERISTICS

Each pin 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 AD9520-1, which is due to the internal pull-up

resistor

Capacitance

RESET TIMING

Pulse Width Low

500

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 16.

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

These pins can be floated to obtain Logic Level ½;

if floating the pin, connect a capacitor to ground

Logic Level 1

0.8 × VS

LD, STATUS, AND REFMON PINS

Table 17.

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 54, Register 0x017, Register 0x01A,

and Register 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 pin 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 VCO 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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