AD7568BS datasheet(2/12 Pages) AD

2 / 12 page

REV. B

–2–

AD7568–SPECIFICATIONS1

Parameter

AD7568B

Units

Test Conditions/Comments

ACCURACY

Resolution

Bits

1 LSB = VREF/2

12 = 1.22 mV when V

REF = 5 V

Relative Accuracy

±0.5

LSB max

Differential Nonlinearity

±0.9

LSB max

All Grades Guaranteed Monotonic over Temperature

Gain Error

+25

°C

±4

LSBs max

TMIN to TMAX

±5

LSBs max

Gain Temperature Coefficient

ppm FSR/

°C typ

ppm FSR/

°C max

Output Leakage Current

IOUT1

@ +25

°C

nA max

See Terminology Section

TMIN to TMAX

200

nA max

REFERENCE INPUT

Input Resistance

Ω min

Typical Input Resistance = 7 k

Ω

Ω max

Ladder Resistance Mismatch

% max

Typically 0.6%

DIGITAL INPUTS

VINH, Input High Voltage

2.4

V min

VINL, Input Low Voltage

0.8

V max

IINH, Input Current

±1

µA max

CIN, Input Capacitance

pF max

POWER REQUIREMENTS

VDD Range

4.75/5.25

V min/V max

Power Supply Sensitivity

∆Gain/∆V

–75

dB typ

IDD

300

µA max

VINH = 4.0 V min, VINL = 0.4 V max

3.5

mA max

VINH = 2.4 V min, VINL = 0.8 V max

AC PERFORMANCE CHARACTERISTICS

Parameter

AD7568B

Units

Test Conditions/Comments

DYNAMIC PERFORMANCE

Output Voltage Settling Time

500

ns typ

To 0.01% of Full-Scale Range. DAC Latch Alternately

Loaded with All 0s and All 1s.

Digital to Analog Glitch Impulse

nV–s typ

Measured with VREF = 0 V. DAC Register Alternately

Loaded with All 0s and All 1s.

Multiplying Feedthrough Error

–66

dB max

VREF = 20 V pk-pk, 10 kHz Sine Wave. DAC Latch

Loaded with All 0s.

Output Capacitance

pF max

All 1s Loaded to DAC.

pF max

All 0s Loaded to DAC.

Channel-to-Channel Isolation

–76

dB typ

Feedthrough from Any One Reference to the Others

with 20 V pk-pk, 10 kHz Sine Wave Applied.

Digital Crosstalk

nV–s typ

Effect of all 0s to all 1s Code Transition on

Nonselected DACs.

Digital Feedthrough

nV–s typ

Feedthrough to Any DAC Output with FSIN High

and Square Wave Applied to SDIN and SCLK.

Total Harmonic Distortion

–83

dB typ

VREF = 6 V rms, 1 kHz Sine Wave.

Output Noise Spectral Density

@ 1 kHz

nV/

√Hz

All 1s Loaded to the DAC. VREF = 0 V. Output Op

Amp is AD OP07.

NOTES

1Temperature range as follows: B Version: –40

°C to +85°C.

2All specifications also apply for V

REF = +10 V, except relative accuracy which degrades to ± 1 LSB.

Specifications subject to change without notice.

(VDD = +4.75 V to +5.25 V; IOUT1 = IOUT2 = O V; VREF = +5 V; TA = TMIN to TMAX,

unless otherwise noted)

(These characteristics are included for Design Guidance and are not subject

to test. DAC output op amp is AD843.)

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