AD9522-2 datasheet(17/84 Pages) AD

17 / 84 page

AD9522-2

Rev. 0 | Page 17 of 84

NOTES

1. EXPOSED DIE PAD MUST BE CONNECTED TO GND.

PIN CONFIGURATION AND FUNCTION DESCRIPTIONS

PIN 1

INDICATOR

REFMON

VCP

STATUS

REF_SEL

SYNC

BYPASS

CLK

SCLK/SCL

OUT3 (OUT3A)

OUT3 (OUT3B)

OUT4 (OUT4A)

OUT4 (OUT4B)

OUT5 (OUT5A)

OUT5 (OUT5B)

OUT8 (OUT8B)

OUT8 (OUT8A)

OUT7 (OUT7B)

OUT7 (OUT7A)

OUT6 (OUT6B)

OUT6 (OUT6A)

AD9522

TOP VIEW

(Not to Scale)

Figure 5. Pin Configuration

Table 21. Pin Function Descriptions

Pin No.

Input/

Output

Type

Mnemonic

Description

1, 11, 12, 27,

32, 35, 40,

41, 46, 49,

54, 57, 60, 61

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 < 5.0 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. This pin 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. It selects REF1 (low) or REF2 (high). This pin has an internal

30 kΩ pull-down resistor.

3.3 V CMOS

SYNC

Manual Synchronizations 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). It 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.

This pin can be left unconnected if the PLL is not used.

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

Differential

clock input

CLK

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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