AD7937AR datasheet(2/8 Pages) AD

2 / 8 page

–2–

REV. 0

AD7937–SPECIFICATIONS

(VDD = 5 V

10%, VREFA = VREFB = 10 V; IOUTA = AGNDA = 0 V, IOUTB = AGNDB = 0 V. All

specifications TMIN to TMAX unless otherwise noted.)

AC PERFORMANCE CHARACTERISTICS

These characteristics are included for Design Guidance only and are not subject to test.

(VDD = 5 V; VREFA = VREFB = 10 V; IOUTA = AGNDA = 0 V, IOUTB = AGNDB = 0 V. Output Amplifiers are AD644 except where noted.)

Parameter

TA = 25 C

Unit

Test Conditions/Comments

Output Current Settling Time

µs max

To 0.01% of full-scale range. IOUT load = 100

Ω, C

EXT = 13 pF. DAC output

measured from falling edge of

WR. Typical Value of Settling Time is 0.6

µs.

Digital-to-Analog Glitch lmpulse

2.5

nV-s typ

Measured with VREFA = VREFB = 0 V. IOUTA, IOUTB load = 100

Ω, C

EXT = 13 pF. DAC

registers alternately loaded with all 0s and all 1s.

AC Feedthrough

VREFA to IOUTA

–70

dB max

VREFA, VREFB = 20 V p-p 10 kHz sine wave.

VREFB to IOUTB

–70

dB max

DAC registers loaded with all 0s.

Power Supply Rejection

∆Gain/∆V

±0.01

% per % max

∆V

DD = VDD max – VDD min.

Output Capacitance

COUTA

pF max

DAC A, DAC B loaded with all 0s.

COUTB

pF max

COUTA

140

pF max

DAC A, DAC B loaded with all 1s.

COUTB

140

pF max

Channel-to-Channel Isolation

VREFA to IOUTB

–84

dB typ

VREFA = 20 V p-p 10 kHz sine wave, VREFB = 0 V. Both DACs loaded with all 1s.

VREFB to IOUTA

–84

dB typ

VREFB = 20 V p-p 10 kHz sine wave, VREFA = 0 V. Both DACs loaded with all 1s.

Digital Crosstalk

2.5

nV-s typ

Measured for a Code Transition of all 0s to all 1s. IOUTA, IOUTB load = 100

Ω,

CEXT = 13 pF.

Output Noise Voltage Density

nV/

√Hz typ

Measured between RFBA and IOUTA or RFBB and IOUTB. Frequency of measurement

(10 Hz–100 kHz)

is 10 Hz–100 kHz.

Total Harmonic Distortion

–82

dB typ

VIN = 6 V rms, 1 kHz. Both DACs loaded with all 1s.

NOTES

1Temperature range as follows: A, B Versions: –40

°C to +85°C.

2Sample tested at 25

°C to ensure compliance.

Specifications subject to change without notice.

Parameter

A Version

B Version

Unit

Test Conditions/Comments

ACCURACY

Resolution

Bits

Relative Accuracy

±1

±1/2

LSB max

Differential Nonlinearity

±1

LSB max

All grades guaranteed monotonic over temperature.

Gain Error

±6

±3

LSB max

Measured using RFBA, RFBB. Both DAC registers loaded with all 1s.

Gain Temperature Coefficient

∆Gain/∆Temperature

±5

ppm/

°C max

Typical value is 1 ppm/

°C.

Output Leakage Current

IOUTA

nA max

DAC A Register loaded with all 0s.

nA max

IOUTB

nA max

DAC B Register loaded with all 0s.

nA max

REFERENCE INPUT

Input Resistance

Ω min

Typical Input Resistance = 14 k

Ω.

Ω max

VREFA, VREFB

Input Resistance Match

±3

% max

Typically

±0.5%.

DIGITAL INPUTS

VIH (Input High Voltage)

2.4

V min

VIL (Input Low Voltage)

0.8

V max

IIN (Input Current)

+25

°C

±1

µA max

VIN = VDD.

TMIN to TMAX

±10

µA max

CIN (Input Capacitance)

pF max

POWER SUPPLY

VDD

4.5/5.5

V min/V max

IDD

mA max

0.1

mA typ

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