AD7118CQ Просмотр технического описания (PDF) - Analog Devices

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AD7118CQ

LOGDAC CMOS Logarithmic D/A Converter

Analog Devices 

Applications Information–AD7118

ABSOLUTE MAXIMUM RATINGS*

(TA = +25°C unless otherwise noted)

VDD (to DGND) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +17 V

VIN (to AGND) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ± 35 V

Digital Input Voltage to DGND . . . . . –0.3 V to VDD + 0.3 V

IOUT to AGND . . . . . . . . . . . . . . . . . . . . . . . . . . –0.3 V to VDD

AGND to DGND . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 to VDD

DGND to AGND . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 to VDD

Power Dissipation (Any Package)

To +75°C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 450 mW

Derates Above +75°C by . . . . . . . . . . . . . . . . . . . 6 mW/°C

Operating Temperature Range

Commercial (K, L Versions) . . . . . . . . . . . . . 0°C to +70°C

Industrial (B, C Versions) . . . . . . . . . . . . . –25°C to +85°C

Extended (T, U Versions) . . . . . . . . . . . . –55°C to +125°C

Storage Temperature . . . . . . . . . . . . . . . . . . –65°C to +150°C

Lead Temperature (Soldering, 10 sec) . . . . . . . . . . . . +300°C

*Stresses above those listed under “Absolute Maximum Ratings may cause perma-

nent damage to the device. This is a stress rating only and 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 rating

conditions for extended periods may affect device reliability.

TERMINOLOGY

RESOLUTION: Nominal change in attenuation when moving

between two adjacent binary codes.

MONOTONICITY: The device is monotonic if the analog out-

put decreases (or remains constant) as the digital code increases.

FEEDTHROUGH ERROR: That portion of the input signal

which reaches the output when all digital inputs are high. See

section on Applications.

OUTPUT LEAKAGE CURRENT: Current which appears on

the IOUT terminal with all digital inputs high.

TOTAL HARMONIC DISTORTION: Is a measure of the

harmonics introduced by the circuit when a pure sinusoid is

applied to the input. It is expressed as the harmonic energy

divided by the fundamental energy at the output.

ACCURACY: Is the difference (measured in dB) between the

ideal transfer function as listed in Table I and the actual transfer

function as measured with the device.

OUTPUT CAPACITANCE: Capacitance from IOUT to

ground.

DIGITAL-TO-ANALOG GLITCH IMPULSE: The amount

of charge injected from the digital inputs to the analog output

when the inputs change state. This is normally specified as the

area of the glitch in either pA-secs or nV-secs depending upon

whether the glitch is measured as a current or voltage signal.

Digital charge injection is measured with VIN = AGND.

PROPAGATION DELAY: This is a measure of the internal

delays of the circuit and is defined as the time from a digital in-

put change to the analog output current reaching 90% of its

final value.

INTERMODULATION DISTORTION: Is a measure of the

interaction which takes place within the circuit between two

sinusoids applied simultaneously to the input.

The reader is referred to Hewlett Packard Application Note 192

for further information.

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 AD7118 features 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.

WARNING!

ESD SENSITIVE DEVICE

REV. A

–3–

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