ADA4850-1YCPZ-R2 datasheet(5/16 Pages) AD

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ADA4850-1/ADA4850-2

Rev. B | Page 5 of 16

ABSOLUTE MAXIMUM RATINGS

Table 3.

Parameter

Rating

Supply Voltage

12.6 V

Power Dissipation

See Figure 4

Power Down Pin Voltage

(−VS + 6) V

Common-Mode Input Voltage

(−VS − 0.5 ) V to (+VS + 0.5) V

Differential Input Voltage

+VS to −VS

Storage Temperature

−65°C to +125°C

Operating Temperature Range

−40°C to +125°C

Lead Temperature Range

(Soldering 10 sec)

300°C

Junction Temperature

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 RESISTANCE

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

specified for the device soldered in the circuit board for

surface-mount packages.

Table 4.

Package Type

θJA

Unit

16-Lead LFCSP

°C/W

8-Lead LFCSP

°C/W

Maximum Power Dissipation

The maximum safe power dissipation for the ADA4850-1/

ADA4850-2 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

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

permanently shifting the parametric performance of the

ADA4850-1/ADA4850-2. Exceeding a junction temperature

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

in silicon devices, potentially causing degradation or loss of

functionality.

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

cent power dissipation and the power dissipated in the die due

to the ADA4850-1/ADA4850-2 drive at the output. The

quiescent power is the voltage between the supply pins (VS)

times the quiescent current (IS).

PD = Quiescent Power + (Total Drive Power − Load Power)

()

OUT

−

⎟⎟

⎠

⎞

⎜⎜

⎝

⎛

RMS output voltages should be considered. If RL is referenced

to −VS, as in single-supply operation, the total drive power is

VS × IOUT. If the rms signal levels are indeterminate, consider

the worst case, when VOUT = VS/4 for RL to midsupply.

() ( )

In single-supply operation with RL referenced to −VS, the worst

case is VOUT = VS/2.

Airflow increases heat dissipation, effectively reducing θJA.

Also, more metal directly in contact with the package leads and

exposed paddle from metal traces through holes, ground, and

power planes reduce θJA.

Figure 4 shows the maximum safe power dissipation in the

package vs. the ambient temperature for the LFCSP (91°C/W)

package on a JEDEC standard 4-layer board. θJA values are

approximations.

–55

125

–45 –35 –25 –15 –5

1525 35 45 5565758595 105 115

AMBIENT TEMPERATURE (

°C)

2.5

2.0

1.5

1.0

0.5

LFCSP-8

LFCSP-16

Figure 4. Maximum Power Dissipation vs. Temperature for a 4-Layer Board

ESD CAUTION

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