AD6657A datasheet(11/36 Pages) AD

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Data Sheet

AD6657A

Rev. 0 | Page 11 of 36

ABSOLUTE MAXIMUM RATINGS

Table 6.

Parameter

Rating

AVDD to AGND

−0.3 V to +2.0 V

DRVDD to AGND

−0.3 V to +2.0 V

VIN+x, VIN−x 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

VCMx to AGND

−0.3 V to AVDD + 0.2 V

CSB to AGND

−0.3 V to DRVDD + 0.2 V

SCLK to AGND

−0.3 V to DRVDD + 0.2 V

SDIO to AGND

−0.3 V to DRVDD + 0.2 V

PDWN to AGND

−0.3 V to DRVDD + 0.2 V

MODE to AGND

−0.3 V to DRVDD + 0.2 V

Digital Outputs to AGND

−0.3 V to DRVDD + 0.2 V

DCO+AB, DCO−AB, DCO+CD,

DCO−CD to AGND

−0.3 V to DRVDD + 0.2 V

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

THERMAL CHARACTERISTICS

The values in Table 7 are per JEDEC JESD51-7 and JEDEC

JESD25-5 for a 2S2P test board. Typical θJA is specified for a

4-layer printed circuit board (PCB) with a solid ground plane.

As shown in Table 7, 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 θJA.

Table 7.

Package Type

Airflow

Velocity

θJA1

θJC2

θJB3

Unit

144-Ball CSP_BGA

0 m/s

26.9

8.9

6.6

°C/W

1 m/s

24.2

°C/W

2.5 m/s

23.0

°C/W

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

2 Per MIL-STD 883, Method 1012.1.

3 Per JEDEC JESD51-8 (still air).

The values in Table 8 are from simulations. The PCB is a JEDEC

multilayer board. Thermal performance for actual applications

requires careful inspection of the conditions in the application

to determine whether they are similar to those assumed in these

calculations.

Table 8.

Package Type

Airflow

Velocity



Unit

144-Ball CSP_BGA

0 m/s

14.4

0.23

°C/W

1 m/s

14.0

0.50

°C/W

2.5 m/s

13.9

0.53

°C/W

ESD CAUTION

Stresses abovethose 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 ratingconditionsfor extended periodsmay affect

device reliability.

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