AD7716 datasheet(2/16 Pages) AD

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AD7716–SPECIFICATIONS1, 2 (f

CLKIN = 8 MHz; MODE Pin Is High (Slave Mode Operation); AVDD = DVDD = +5 V

5%; AVSS = –5 V

5%; AGND = DGND = 0 V; VREF = 2.5 V; Filter Cutoff = 146 Hz; Noise Measurement Bandwidth = 146 Hz; AIN Source

Resistance = 750

2 with 1 nF to AGND at each A

IN. TA = TMIN to TMAX, unless otherwise noted.)

Parameter

B Version

Units

Test Conditions/Comments

STATIC PERFORMANCE

Resolution

Bits

Integral Linearity Error

0.003

% FSR typ

Guaranteed No Missed Codes to 21 Bits3

0.006

% FSR max

Gain Error

% FSR max

Gain Match Between Channels

0.5

% FSR max

Gain TC

µV/°C typ

Offset Error

0.2

% FSR max

Offset Match Between Channels

0.1

% FSR max

Offset TC

µV/°C typ

Noise

µV rms max

See Table I for Typical Noise Performance vs. Programmed

Cutoff Frequency

DYNAMIC PERFORMANCE

Sampling Rate

fCLKIN/14

570 kHz for fCLKIN = 8 MHz

Output Update Rate

fCLKIN/(14

256

2N)

N Is Decimal Equivalent of FC2, FC1, FC0 in Control Register

Filter Cutoff Frequency

fCLKIN/(3.81

256

2N)

Settling Time

256

2N/fCLKIN)

Usable Dynamic Range4

See Table I

Total Harmonic Distortion

–90

dB typ

Input Frequency = 35 Hz

–100

dB typ

AIN =

±10 mV p-p

Absolute Group Delay3

256

2N)/2fCLKIN

Differential Group Delay3

ns typ

Channel-to-Channel Isolation

–85

dB typ

Feedthrough from Any One Channel to the Other Three, with

35 Hz Full-Scale Sine Wave Applied to that Channel

ANALOG INPUT

Input Range

±2.5

Volts

Input Capacitance

pF typ

Input Bias Current

nA typ

LOGIC INPUTS

VINH, Input High Voltage

2.4

V min

VINL, Input Low Voltage

0.8

V max

IIN, Input Current

SDATA, RFS

+10/-130

µA max

Internal 50 k

Ω Pull-Up Resistors

TFS

+10/-650

µA max

Internal 10 k

Ω Pull-Up Resistor

All Other Inputs

±10

µA max

CIN, Input Capacitance

pF max

LOGIC OUTPUTS

VOH, Output High Voltage

2.4

V min

|IOUT|

≤ 40 µA

VOL, Output Low Voltage

0.4

V max

|IOUT|

≤ 1.6 mA

POWER SUPPLIES

Reference Input

2.4/2.6

V min/V max

AVDD

4.75/5.25

V min/V max

DVDD

4.75/5.25

V min/V max

AVSS

–4.75/–5.25

V min/V max

IDD

7.5

mA max

4.8 mA typ

ISS

2.5

mA max

1.8 mA typ

Power Consumption

mW max

35 mW typ

Power Supply Rejection

–70

dB typ

NOTES

1Operating temperature ranges as follows : B Version; –40

°C to +85°C.

2The AIN pins present a very high impedance dynamic load which varies with clock frequency.

3Guaranteed by design and characterization. Digital filter has linear phase.

4Usable dynamic range is guaranteed by measuring noise and relating this to the full-scale input range.

5100 mV p-p, 120 Hz sine wave applied to each supply.

Specifications subject to change without notice.

REV. A

–2–

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