AD8137YR データシートの表示（PDF） - Analog Devices

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AD8137YR

Low Cost, Low Power, Differential ADC Driver

Analog Devices 

Data Sheet

ABSOLUTE MAXIMUM RATINGS

Table 4.

Parameter

Supply Voltage

VOCM

Power Dissipation

Input Common-Mode Voltage

Storage Temperature Range

Operating Temperature Range

Lead Temperature (Soldering, 10 sec)

Junction Temperature

Rating

12 V

VS+ to VS−

See Figure 3

VS+ to VS−

−65°C to +125°C

−40°C to +125°C

300°C

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 a circuit board in still air.

Table 5. Thermal Resistance

Package Type

θJA

θJC

8-Lead SOIC/2-Layer

157

56

8-Lead SOIC/4-Layer

125

56

8-Lead LFCSP/4-Layer

70

56

Unit

°C/W

°C/W

°C/W

MAXIMUM POWER DISSIPATION

The maximum safe power dissipation in the AD8137 package

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 AD8137. Exceeding a junction temperature

of 175°C for an extended period can result in changes in the

silicon devices, potentially causing failure.

AD8137

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 is the voltage between the supply pins (VS) times the

quiescent current (IS). The load current consists of differential

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

currents flowing through the external feedback networks and

the internal common-mode feedback loop. The internal resistor

tap used in the common-mode feedback loop places a 1 kΩ

differential load on the output. RMS output voltages 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

(125°C/W) and 8-lead LFCSP (θJA = 70°C/W) on a JEDEC

standard 4-layer board. θJA values are approximations.

3.0

2.5

LFCSP

2.0

1.5

1.0

SOIC-8

0.5

0

–40 –30 –20 –10 0 10 20 30 40 50 60 70 80 90 100 110 120

AMBIENT TEMPERATURE (°C)

Figure 3. Maximum Power Dissipation vs.

Ambient Temperature for a 4-Layer Board

ESD CAUTION

Rev. E | Page 9 of 32

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