AD8382 Ver la hoja de datos (PDF) - Analog Devices

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AD8382

High Performance 12-Bit, 6-Channel Output, Decimating LCD DecDriver

Analog Devices 

Data Sheet

AD8382

ABSOLUTE MAXIMUM RATINGS

Table 2.

Parameter

Supply Voltages

AVCCx to AGNDx

DVCC to DGND

Input Voltages

Maximum Digital Input Voltage

Minimum Digital Input Voltage

Maximum Analog Input Voltage

Minimum Analog Input Voltage

Internal Power Dissipation1

LFCSP Package @ 25°C Ambient

Operating Temperature Range

Storage Temperature Range

Lead Temperature Range (Soldering 10 sec)

Rating

18 V

4.5 V

DVCC + 0.5 V

DGND – 0.5 V

AVCC + 0.5 V

AGND – 0.5 V

3.84 W

0°C to 85°C

–65°C to +125°C

300°C

1 48-lead LFCSP Package:

JA = 26°C/W (JEDEC STD, 4-layer PCB in still air)

JC = 20°C/W.

ΨJB = 11°C/W in Still Air

Stresses at or above those listed under Absolute Maximum

Ratings may cause permanent damage to the product. This is a

stress rating only; functional operation of the product at these

or any other conditions above those indicated in the operational

section of this specification is not implied. Operation beyond

the maximum operating conditions for extended periods may

affect product reliability.

OVERLOAD PROTECTION

The AD8382 employs a two-stage overload protection circuit

that consists of an output current limiter and a thermal

shutdown. The maximum current at any output of the AD8382

is internally limited to 100 mA average. In the event of a

momentary short circuit between a video output and a power

supply rail (VCC or AGND), the output current limit is

sufficiently low to provide temporary protection.

The thermal shutdown “debiases” the output amplifier when the

junction temperature reaches the internally set trip point. In the

event of an extended short circuit between a video output and

power supply rail, the output amplifier current continues to

switch between 0 mA and 100 mA typ. with a period set by the

thermal time constant and hysteresis of the thermal trip point.

The thermal shutdown provides long-term protection by

limiting average junction temperature to a safe level.

EXPOSED PADDLE

To ensure a high degree of reliability, the exposed paddle must

be electrically connected to AVCC. To ensure optimized thermal

performance, the exposed paddle must be thermally connected

to the AVCC plane as described in the Applications section.

MAXIMUM POWER DISSIPATION

The maximum power that the AD8382 can safely dissipate is

limited by its junction temperature. The maximum safe junction

temperature for plastic encapsulated devices, as determined by

the plastic’s glass transition temperature, is approximately

150°C. Temporarily exceeding this limit may cause a shift in

parametric performance due to a change in stresses exerted on

the die by the package. Exceeding a junction temperature of

175°C for extended periods can result in device failure.

OPERATING TEMPERATURE RANGE

Although the maximum safe operating junction temperature is

higher, the AD8382 is 100% tested at a junction temperature of

125°C. Consequently, the maximum guaranteed operating

junction temperature is 125°C. To ensure operation within the

specified operating temperature range, it is necessary to limit

the maximum power dissipation to:

PDMAX 

(TJMAX–TA)

(θJA–0.9  3 Airflow

in

lfm)

where TJMAX = 125°C

AD8382 ON A 4–LAYER JEDEC PCB WITH THERMALLY OPTIMIZED

LANDING PATTERN AS DESCRIBED IN THE APPLICATION NOTES

2.00

1.75 120MHz

1.50

1.25

60Hz XGA

200 lfm

STILL AIR

500 lfm

1.00

Quiescent

0.75

0.50

65 70 75 80 85 90 95 100 105 110 115

MAXIMUM AMBIENT TEMPERATURE (°C)

Figure 2. Maximum Power Dissipation vs. Temperature

Note: Quiescent power dissipation is 0.74 W when operating

under the conditions specified in this data sheet.

When driving a 6-channel XGA panel with an input capacitance

of 200 pF, the AD8382 dissipates a total of 1.14 W when

displaying 1 pixel wide alternating white and black vertical lines

generated by a standard 60 Hz XGA input video.

The total power dissipation of the AD8382 is 1.67 W when

operating at the maximum specified frequency of 120 MHz,

under the conditions specified in this data sheet (Figure 2).

ESD CAUTION

Rev. B | Page 5 of 21

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