AD8285 datasheet(4/27 Pages) AD

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AD8285

Data Sheet

Rev. B | Page 4 of 27

Parameter2

Test Conditions/Comments

Min

Typ

Max

Unit

ADC

Resolution

Bits

Maximum Sample Rate

MSPS

Signal-to-Noise Ratio (SNR)

fIN = 1 MHz

68.5

Signal-to-Noise and Distortion

(SINAD)

Signal-to-Noise Ratio Full Scale

(SNRFS)

Differential Nonlinearity (DNL)

Guaranteed no missing codes

LSB

Integral Nonlinearity (INL)

LSB

Effective Number of Bits (ENOB)

10.67

LSB

ADC OUTPUT CHARACTERISTICS

Maximum Capacitor Load

Per bit

IDVDD33 Peak Current with Capacitor

Load

Peak current per bit when driving 20 pF load;

can be programmed via the SPI port, if required

ADC REFERENCE

Output Voltage Error

VREF = 1.024 V

±25

Load Regulation

At 1.0 mA, VREF = 1.024 V

Input Resistance

kΩ

FULL CHANNEL CHARACTERISTICS

LNA, PGA, AAF, and ADC channels

SNRFS

fIN = 1 MHz

Gain = 16 dB

Gain = 22 dB

Gain = 28 dB

Gain = 34 dB

SINAD

fIN = 1 MHz

Gain = 16 dB

Gain = 22 dB

Gain = 28 dB

Gain = 34 dB

Spurious-Free Dynamic Range

(SFDR)

fIN = 1 MHz

Gain = 16 dB

Gain = 22 dB

Gain = 28 dB

Gain = 34 dB

Harmonic Distortion

Second Harmonic

fIN = 1 MHz at −10 dBFS, gain = 16 dB

−70

dBc

fIN = 1 MHz at −10 dBFS, gain = 34 dB

−70

dBc

Third Harmonic

fIN = 1 MHz at −10 dBFS, gain = 16 dB

−66

dBc

fIN = 1 MHz at −10 dBFS, gain = 34 dB

−75

dBc

IM3 Distortion

fIN1 = 1 MHz, fIN2 = 1.1 MHz, −1 dBFS, gain = 34 dB

−69

dBc

Gain Response Time

600

Overdrive Recovery Time

200

1 x stands for A, B, C, or D.

2 See the AN-835 Application Note, Understanding High Speed ADC Testing and Evaluation, for a complete set of definitions, and how these tests were completed.

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