AD7856ARS datasheet(2/32 Pages) AD

2 / 32 page

–2–

REV. A

AD7856–SPECIFICATIONS1, 2

Parameter

A Version

K Version

Units

Test Conditions/Comments

DYNAMIC PERFORMANCE

fIN = 10 kHz

Signal to Noise + Distortion Ratio

3 (SNR)

dB min

79.5 dB typ

Total Harmonic Distortion (THD)

–86

dB max

–95 dB typ

Peak Harmonic or Spurious Noise

–87

dB max

–95 dB typ

Intermodulation Distortion (IMD)

Second Order Terms

–86

–90

dB typ

fa = 9.983 kHz, fb = 10.05 kHz

Third Order Terms

–86

–90

dB typ

fa = 9.983 kHz, fb = 10.05 kHz

Channel-to-Channel Isolation

–90

dB typ

VIN = 25 kHz

DC ACCURACY

Any Channel

Resolution

Bits

Integral Nonlinearity

±2

LSB max

4.096 V External Reference, VDD = 5 V

±2

LSB typ

Differential Nonlinearity

±2

LSB max

Guaranteed No Missed Codes to 13 Bits.

±2

LSB typ

Offset Error

±10

LSB max

±10

±5

LSB typ

Offset Error Match

±3

LSB max

Positive Full-Scale Error

±10

LSB max

±10

LSB typ

Positive Full-Scale Error Match

±2

LSB max

ANALOG INPUT

Input Voltage Ranges

0 to VREF

Volts

i.e., AIN(+) – AIN(–) = 0 to VREF, AIN(–) Can Be

Biased Up, but AIN(+) Cannot Go Below AIN(–)

Leakage Current

±1

µA max

Input Capacitance

pF typ

REFERENCE INPUT/OUTPUT

REFIN Input Voltage Range

4.096/VDD

2.3/VDD

V min/max

Functional from 1.2 V

Input Impedance

150

Ω typ

Resistor Connected to Internal Reference Node

REFOUT Output Voltage

3.696/4.496

V min/max

REFOUT Tempco

ppm/

°C typ

LOGIC INPUTS

Input High Voltage, VINH

VDD – 1.0

V min

Input Low Voltage, VINL

0.4

V max

Input Current, IIN

±1

µA max

Typically 10 nA, VIN = 0 V or VDD

Input Capacitance, CIN

pF max

LOGIC OUTPUTS

Output High Voltage, VOH

VDD – 0.4

V min

ISOURCE = 200 µA

Output Low Voltage, VOL

0.4

V max

ISINK = 0.8 mA

Floating-State Leakage Current

±1

µA max

Floating-State Output Capacitance

pF max

Output Coding

Straight (Natural) Binary

CONVERSION RATE

Conversion Time

3.5

5.25

µs max

21 CLKIN Cycles

Track/Hold Acquisition Time

0.33

0.5

µs min

A Grade: fCLKIN = 6 MHz, (–40 C to +105 C), fSAMPLE = 285 kHz; K Grade:

fCLKIN = 4 MHz, (0 C to +105 C), fSAMPLE = 102 kHz; (AVDD = DVDD = +5.0 V

5%,

REFIN/REFOUT = 4.096 V External Reference unless otherwise noted, SLEEP = Logic High; TA = TMIN to TMAX, unless otherwise noted.) Specifica-

tions apply for Mode 2 operation, standard 3-wire SPI interface; refer to Detailed Timing section for Mode 1 Specifications.

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