ADA4940-1ARZ-R7 datasheet(7/32 Pages) AD

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Data Sheet

ADA4940-1/ADA4940-2

Rev. B | Page 7 of 32

ABSOLUTE MAXIMUM RATINGS

Table 9.

Parameter

Rating

Supply Voltage

8 V

VOCM

±VS

Differential Input Voltage

1.2 V

Operating Temperature Range

−40°C to +125°C

Storage Temperature Range

−65°C to +150°C

Lead Temperature (Soldering, 10 sec)

300°C

Junction Temperature

150°C

ESD

Field Induced Charged Device Model (FICDM)

1250 V

Human Body Model (HBM)

2000 V

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 RESISTANCE

θJA is specified for the worst-case conditions, that is, θJA is

specified for the device soldered on a circuit board in still air.

Table 10.

Package Type

θJA

Unit

8-Lead SOIC (Single)/4-Layer Board

158

°C/W

16-Lead LFCSP (Single)/4-Layer Board

91.3

°C/W

24-Lead LFCSP (Dual)/4-Layer Board

65.1

°C/W

MAXIMUM POWER DISSIPATION

The maximum safe power dissipation in the ADA4940-1/

ADA4940-2 packages is limited by the associated rise in

junction temperature (TJ) on the die. At approximately 150°C,

which is the glass transition temperature, the plastic changes its

properties. Even temporarily exceeding this temperature limit

can change the stresses that the package exerts on the die,

permanently shifting the parametric performance of the

ADA4940-1/ADA4940-2. Exceeding a junction temperature

of 150°C for an extended period can result in changes in the

silicon devices, potentially causing failure.

The power dissipated in the package (PD) is the sum of the

quiescent power dissipation and the power dissipated in the

package due to the load drive for all outputs. The quiescent

power dissipation is the voltage between the supply pins (±VS)

times the quiescent current (IS). The load current consists of the

differential and common-mode currents flowing to the load, as

well as currents flowing through the external feedback networks

and internal common-mode feedback loop. The internal

resistor tap used in the common-mode feedback loop places a

negligible differential load on the output. RMS voltages and

currents should be considered when dealing with ac signals.

Airflow reduces θJA. In addition, more metal directly in contact

with the package leads from metal traces, through holes, ground,

and power planes reduces the θJA.

Figure 3 shows the maximum safe power dissipation in the

package vs. the ambient temperature for the 8-lead SOIC (θJA =

158°C/W, single)the 16-lead LFCSP (θJA = 91.3°C/W, single) and

24-lead LFCSP (θJA = 65.1°C/W, dual) packages on a JEDEC

standard 4-layer board. θJA values are approximations.

3.5

–40

–20

120

100

AMBIENT TEMPERATURE (°C)

0.5

1.0

1.5

2.0

2.5

3.0

ADA4940-2 (LFCSP)

ADA4940-1 (LFCSP)

ADA4940-1 (SOIC)

Figure 3. Maximum Safe Power Dissipation vs. Ambient Temperature

ESD CAUTION

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