AD7707 datasheet(2/40 Pages) AD

Teilenummer	AD7707

Bauteilbeschribung	3 V/5 V, -10 V Input Range, 1 mW 3-Channel 16-Bit, Sigma-Delta ADC

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REV. A

–2–

AD7707–SPECIFICATIONS

Parameter

B Version

1

Units

Conditions/Comments

STATIC PERFORMANCE

Low Level Input Channels (AIN1 and AIN2)

No Missing Codes

16

Bits min

Guaranteed by Design. Filter Notch < 60 Hz

Output Noise

See Tables I and III

Depends on Filter Cutoffs and Selected Gain

Integral Nonlinearity

2

±0.003

% of FSR max

Filter Notch < 60 Hz. Typically

±0.0003%

Unipolar Offset Error

See Note 3

Unipolar Offset Drift

4

0.5

µV/°C typ

Bipolar Zero Error

See Note 3

Bipolar Zero Drift

4

0.5

µV/°C typ

For Gains 1, 2 and 4

0.1

µV/°C typ

For Gains 8, 16, 32, 64 and 128

Positive Full-Scale Error

5

See Note 3

Full-Scale Drift

4, 6

0.5

µV/°C typ

Gain Error

7

See Note 3

Gain Drift

4, 8

0.5

ppm of FSR/

°C typ

Bipolar Negative Full-Scale Error

2

±0.003

% of FSR max

Typically

±0.0007%

Bipolar Negative Full-Scale Drift4

1

µV/°C typ

For Gains of 1 to 4

0.6

µV/°C typ

For Gains of 8 to 128

HIGH LEVEL INPUT CHANNEL (AIN3)

No Missing Codes

16

Bits min

Guaranteed by Design. Filter Notch < 60 Hz

Output Noise

See Tables IV and VI

Depends on Filter Cutoffs and Selected Gain

Integral Nonlinearity2

±0.003

% of FSR max

Filter Notch < 60 Hz. Typically

±0.0003%

Unipolar Offset Error

9

±10

mV max

Typically Within

±1.5 mV

Unipolar Offset Drift

4

µV/°C typ

Bipolar Zero Error

9

±10

mV max

Typically Within

±1.5 mV

Bipolar Zero Drift

4

µV/°C typ

For Gains 1, 2 and 4

1

µV/°C typ

For Gains 8, 16, 32, 64 and 128

Gain Error

±0.2

% typ

Typically Within

±0.05%

Gain Drift

0.5

ppm of FSR/

°C typ

Negative Full-Scale Error

2

±0.0012

% of FSR typ

LOW LEVEL ANALOG INPUTS/REFERENCE INPUTS

Specifications for AIN and REF IN Unless Noted

Input Common-Mode Rejection (CMR)

2

Low Level Input Channels, AIN1 and AIN2

AVDD = 5 V

Gain = 1

100

dB typ

Gain = 2

105

dB typ

Gain = 4

110

dB typ

Gain = 8 to 128

130

dB typ

AVDD = 3 V

Gain = 1

105

dB typ

Gain = 2

110

dB typ

Gain = 4

120

dB typ

Gain = 8 to 128

130

dB typ

Normal-Mode 50 Hz Rejection

2

98

dB typ

For Filter Notches of 10 Hz, 25 Hz, 50 Hz,

±0.02 × f

NOTCH

Normal-Mode 60 Hz Rejection

2

98

dB typ

For Filter Notches of 10 Hz, 20 Hz, 60 Hz,

±0.02 × f

NOTCH

Common-Mode 50 Hz Rejection

2

150

dB typ

For Filter Notches of 10 Hz, 25 Hz, 50 Hz,

±0.02 × f

NOTCH

Common-Mode 60 Hz Rejection2

150

dB typ

For Filter Notches of 10 Hz, 20 Hz, 60 Hz,

±0.02 × f

NOTCH

Absolute/Common-Mode REF IN Voltage

2

AGND to AVDD

V min to V max

Absolute/Common-Mode AIN Voltage

2, 10

AGND – 100 mV

V min

BUF Bit of Setup Register = 0

AVDD + 30 mV

V max

AGND + 50 mV

V min

BUF Bit of Setup Register = 1

AVDD – 1.5 V

V max

AIN DC Input Current2

1

nA max

AIN Sampling Capacitance

2

10

pF max

BUF = 0

AIN Differential Voltage Range

11

0 to +VREF/GAIN

12

nom

Unipolar Input Range (B/U Bit of Setup Register = 1)

±V

REF/GAIN

nom

Bipolar Input Range (B/U Bit of Setup Register = 0)

AIN Input Sampling Rate, fS

GAIN

× f

CLKIN/64

For Gains of 1 to 4

fCLKIN/8

For Gains of 8 to 128

Reference Input Range

REF IN(+) – REF IN(–) Voltage

1/1.75

V min/max

AVDD = 2.7 V to 3.3 V. VREF = 1.225 V ± 1% for

Specified Performance

REF IN(+) – REF IN(–) Voltage

1/3.5

V min/max

AVDD = 4.75 V to 5.25 V. VREF = 2.5 V ± 1% for

Specified Performance

REF IN Input Sampling Rate, fS

fCLKIN/64

±100 mV INPUT RANGE

Low Level Input Channels, (AIN1 and AIN2)

Gain = 16, Unbuffered Mode

INL

2

±0.003

% of FSR max

Filter Notch < 60 Hz

Input Common-Mode Rejection (CMR)

2

80

dB typ

Power Supply Rejection (PSR)

2

90

dB typ

(AVDD = DVDD = +3 V or 5 V, REF IN(+) = +1.225 V with AVDD = 3 V and +2.5 V with AVDD

= 5 V; REF IN(–) = GND; VBIAS = REFIN(+); MCLK IN = 2.4576 MHz unless otherwise

noted. All specifications TMIN to TMAX unless otherwise noted.)

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