AD9255 datasheet(11/45 Pages) AD

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AD9255

Data Sheet

Rev. C | Page 10 of 44

ABSOLUTE MAXIMUM RATINGS

Table 6.

Parameter

Rating

Electrical

AVDD to AGND

−0.3 V to +2.0 V

DRVDD to AGND

−0.3 V to +2.0V

SVDD to AGND

−0.3 V to +3.6 V

VIN+, VIN− to AGND

−0.3 V to AVDD + 0.2 V

CLK+, CLK− to AGND

−0.3 V to AVDD + 0.2 V

SYNC to AGND

−0.3 V to AVDD + 0.2 V

VREF to AGND

−0.3 V to AVDD + 0.2 V

SENSE to AGND

−0.3 V to AVDD + 0.2 V

VCM to AGND

−0.3 V to AVDD + 0.2 V

RBIAS to AGND

−0.3 V to AVDD + 0.2 V

CSB to AGND

−0.3 V to SVDD +0.3 V

SCLK/DFS to AGND

−0.3 V to SVDD +0.3 V

SDIO/DCS to AGND

−0.3V to SVDD + 0.3 V

OEB to AGND

−0.3 V to DRVDD + 0.2 V

PDWN to AGND

−0.3 V to DRVDD + 0.2 V

LVDS to AGND

−0.3 V to AVDD + 0.2 V

LVDS_RS to AGND

−0.3 V to AVDD + 0.2 V

DITHER to AGND

−0.3 V to AVDD + 0.2 V

D0 through D13 to AGND

−0.3 V to DRVDD + 0.2 V

DCO to AGND

−0.3 V to DRVDD + 0.2 V

Environmental

Operating Temperature Range

(Ambient)

−40°C to +85°C

Maximum Junction Temperature

Under Bias

150°C

Storage Temperature Range

(Ambient)

−65°C to +150°C

Stresses above those listed under Absolute Maximum Ratings

may cause permanent damage to the device. This is a stress

rating only; functional operation of the device at these or any

other conditions above those indicated in the operational

section of this specification is not implied. Exposure to absolute

maximum rating conditions for extended periods may affect

device reliability.

THERMAL CHARACTERISTICS

The exposed paddle must be soldered to the ground plane for

the LFCSP package. Soldering the exposed paddle to the customer

board increases the reliability of the solder joints and maximizes

the thermal capability of the package.

Typical θJA is specified for a 4-layer PCB with a solid ground

plane. As shown, airflow improves heat dissipation, which

reduces θJA. In addition, metal in direct contact with the package

leads from metal traces, through holes, ground, and power

planes, reduces the θJA.

Table 7. Thermal Resistance

Package Type

Airflow

Velocity

(m/s)

θJA1,2

θJC1,3

θJB1,4

Unit

48-Lead LFCSP

(CP-48-8)

24.5

1.3

12.7

°C/W

1.0

21.4

°C/W

2.5

19.2

°C/W

Per JEDEC 51-7, plus JEDEC 25-5 2S2P test board.

Per JEDEC JESD51-2 (still air) or JEDEC JESD51-6 (moving air).

Per MIL-Std 883, Method 1012.1.

Per JEDEC JESD51-8 (still air).

ESD CAUTION

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