AD7709BR datasheet(2/17 Pages) AD

Nome de Peças	AD7709BR

Descrição Electrónicos	16-Bit Sigma Delta ADC with Current Sources, Switchable Reference Inputs and I/O Port

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Fabricante Electrônico	AD [Analog Devices]

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REV. PrA

January 2001

AD7709-SPECIFICATIONS1

(VDD = +3V or +5.0V , REFIN(+) = +2.5V; REFIN(-) = 0V;

XTAL1/XTAL2 = 32 kHz Crystal;

All specifications TMIN to TMAX unless otherwise noted.)

PRELIMINARY TECHNICAL DATA

PARAMETER

B Grade

Units

Test Conditions

Output Update Rate

5.4

Hz min.

105

Hz max.

0.021Hz (0.732msec.) increments

No Missing Codes

16

bits min.

Resolution

13

bits pk-pk

+20mV range, 20Hz Update Rate

16

bits pk-pk

+2.56V range, 20Hz Update Rate

Output Noise and Update Rates

See Tables Below in ADC Description

Integral Nonlinearity

15

ppm of FSR max.

Offset Error

T B D

Offset Error Drift Vs Temp

10

nV/°C typ.

Offset Error Drift Vs Time

T B D

nV/1000 Hours typ.

Gain Error

T B D

Gain Error Drift Vs Temp

1

ppm/°Ctyp.

Gain Error Drift Vs Time

T B D

ppm/1000 Hours typ.

Power Supply Rejection(PSR)

90

dB min.

Input Range = ±20mV

90

dB min.

Input Range = ±2.56V

Common Mode Rejection(CMR)

On AIN

90

dB min.

At DC, Range = ±20mV

On AIN

90

dB min.

At DC, Range = ±2.56V

On REFIN

90

dB min.

At DC, Range = ±20mV

On REFIN

90

dB min.

At DC, Range = ±2.56V

Analog Input Current

DC Bias Current

1

nA max.

DC Bias Current Drift

T B D

nA typ.

DC Offset Current

T B D

nA typ.

DC Offset Current Drift

T B D

nA typ.

REFERENCE INPUTS (REFIN1& REFIN2)

Normal Mode

50Hz/60Hz Rejection

60

dB min.

Reference DC Input Current

T B D

µA typ.

REFIN(+) to REFIN(-) Voltage

+2.5V

nom.

REFIN referes to both REFIN1 and REFIN2

REFIN(+) to REFIN(-) Range

+ 1

V min.

VDD

V max.

REFIN Common Mode Range

GND-30mV

V min.

VDD+30mV

V max.

REFIN Common Mode

50/60Hz Rejection

T B D

dB min.

ANALOG INPUTS

Normal Mode 50Hz/60Hz Rejection

60

dB min.

50/60Hz ±1Hz , 20Hz Update Rate

Common Mode 50/60Hz Rejection

90

dB min.

50/60Hz ±1Hz, Range = ±20mV

90

dB min.

50/60Hz ±1Hz, Range = ±2.5V

Differential Input Voltage Ranges

±REFIN/GAIN

V nom.

REFIN refers to both REFIN1 and

REFIN2.

REFIN=REFIN(+ )-REFIN(-)

GAIN=1to 128.

Pseudo-Differential Input Voltage Ranges

0V to REFIN/GAIN V nom.

Full-scale Range Matching

5

uV typ.

Absolute Ain Voltage Limits

Buffered Inputs

GND+50mV

V min.

VDD-50mV

V max

Unbuffered Inputs

GND-30mV

Vmin

VDD+30mV

Vmax

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