AD9807/AD9805

–7–

REV. 0

WARNING!

ESD SENSITIVE DEVICE

CAUTION

ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily

accumulate on the human body and test equipment and can discharge without detection.

Although the AD9807/AD9805 feature proprietary ESD protection circuitry, permanent damage

may occur on devices subjected to high energy electrostatic discharges. Therefore, proper ESD

precautions are recommended to avoid performance degradation or loss of functionality.

ABSOLUTE MAXIMUM RATINGS*

With

Respect

Parameter

to

Min

Max

Units

AVDD

AVSS

–0.5

+6.5

Volts

AVSS

AVDD

–6.5

+0.5

Volts

DVDD

DVSS

–0.5

+6.5

Volts

AGND

DVSS

–0.3

+0.3

Volts

AVDD

DVDD

–6.5

+6.5

Volts

Clock Input

DVSS

–0.5

DVDD + 0.5 Volts

Digital Outputs

DVSS

–0.5

AVDD + 0.3 Volts

AIN, VREF

AVSS

–0.3

AVDD + 0.3 Volts

Junction Temperature

+150

°C

Storage Temperature

–65

+150

°C

Lead Temperature (10 sec)

+300

°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 sections of this specification is not implied. Exposure to absolute

maximum ratings for extended periods may affect device reliability.

ORDERING GUIDE

Temperature

Package

Package

Model

Range

Description

Option*

AD9807JS

0

°C to +70°C

PQFP

S-64

AD9805JS

0

°C to +70°C

PQFP

S-64

*S = Plastic Quad Flatpack.

DEFINITIONS OF SPECIFICATIONS

INTEGRAL NONLINEARITY

Linearity error refers to the deviation of each individual code

from a line drawn from “negative full scale” through “positive

before the first code transition. “Positive full scale” is defined as a

level 1 1/2 LSB beyond the last code transition. The deviation is

measured from the middle of each particular code to the true

straight line.

DIFFERENTIAL LINEARITY ERROR (DNL, NO MISSING

CODES)

An ideal ADC exhibits code transitions that are exactly 1 LSB

apart. DNL is the deviation from this ideal value. Thus every

code must have a finite width. Guaranteed no missing codes

to 12-bit resolution indicates that all 4096 codes, respectively,

must be present over all operating ranges.

UNIPOLAR OFFSET ERROR

In the unipolar mode, the first transition should occur at a level

1/2 LSB above analog common. Unipolar offset is defined as

the deviation of the actual from that point. The unipolar offset

temperature coefficient specifies the maximum change of the

transition point over temperature, with or without external

adjustments.

GAIN ERROR

The last transition should occur for an analog value 1 1/2 LSB

below the nominal full scale. Gain error is the deviation of the

actual difference between first and last code transitions and the

ideal difference between first and last code transitions.

POWER SUPPLY REJECTION

Power Supply Rejection specifies the maximum full-scale change

from the initial value with the supplies at the various limits.

APERTURE DELAY

Aperture delay is a timing measurement between the sampling

clocks and the CDS. It is measured from the falling edge of the

CDSCLK2 input to when the input signal is held for conversion

in CDS mode. In non-CDS mode, it is the falling edge of

CDSCLK1.