AD9520-1SLASHPCBZ datasheet(18/80 Pages) AD

18 / 80 page

AD9520-1

Data Sheet

Rev. B | Page 18 of 80

PIN CONFIGURATION AND FUNCTION DESCRIPTIONS

NOTES

1. EXPOSED DIE PAD MUST BE CONNECTED TO GND.

PIN 1

INDICATOR

REFMON

VCP

STATUS

REF_SEL

SYNC

BYPASS

CLK

SCLK/SCL

OUT3 (OUT3A)

OUT3 (OUT3B)

VS_DRV

OUT4 (OUT4A)

OUT4 (OUT4B)

OUT5 (OUT5A)

OUT5 (OUT5B)

OUT8 (OUT8B)

OUT8 (OUT8A)

OUT7 (OUT7B)

OUT7 (OUT7A)

VS_DRV

OUT6 (OUT6B)

OUT6 (OUT6A)

AD9520

TOP VIEW

(Not to Scale)

Figure 5. Pin Configuration

Table 21. Pin Function Descriptions

Pin No.

Input/

Output

Type

Mnemonic

Description

1, 11, 12,

32, 40, 41,

49, 57, 60,

Power

3.3 V Power Pins.

3.3 V CMOS

REFMON

Reference Monitor (Output). This pin has multiple selectable outputs.

3.3 V CMOS

Lock Detect (Output). This pin has multiple selectable outputs.

Power

VCP

Power Supply for Charge Pump (CP); VS ≤ VCP ≤ 5.25 V. VCP must still be connected to

3.3 V if the PLL is not used.

Loop filter

Charge Pump (Output). This pin connects to an external loop filter; it can be left

unconnected if the PLL is not used.

3.3 V CMOS

STATUS

Programmable Status Output.

3.3 V CMOS

REF_SEL

Reference Select. This pin selects REF1 (low) or REF2 (high) and has an internal 30 kΩ

pull-down resistor.

3.3 V CMOS

SYNC

Manual Synchronization and Manual Holdover. This pin initiates a manual

synchronization and is used for manual holdover. Active low. This pin has an

internal 30 kΩ pull-up resistor.

Loop filter

Loop Filter (Input). This pin connects internally to the VCO control voltage node.

Loop filter

BYPASS

This pin is for bypassing the LDO to ground with a 220 nF capacitor. It can be left

unconnected if the PLL is not used.

Differential

clock input

CLK

Along with CLK, this pin is the differential input for the clock distribution section.

Differential

clock input

CLK

Along with CLK, this pin is the differential input for the clock distribution section. If a

single-ended input is connected to the CLK pin, connect a 0.1 μF bypass capacitor from

this pin to ground.

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