AD7707 datasheet(6/53 Pages) AD

Part #	AD7707

Description	3-Channel 16-Bit, Sigma-Delta ADC

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Manufacturer	AD [Analog Devices]

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AD7707

Rev. B | Page 5 of 52

Parameter

B Version1

Unit

Conditions/Comments

Common-Mode 60 Hz Rejection2

150

dB typ

For filter notches of 10 Hz, 20 Hz, 60 Hz, ±0.02 × fNOTCH

Absolute/Common-Mode REF IN Voltage2

AGND to AVDD

V min to V max

Absolute/Common-Mode AIN Voltage2, 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 Capacitance2

10

pF max

BUF = 0

AIN Differential Voltage Range11, 12

0 to +VREF/gain

V nom

Unipolar input range (

B/U bit of setup register = 1)

±VREF/gain

V nom

Bipolar input range (

B/U bit of setup register = 0)

AIN Input Sampling Rate, fS

Gain × fCLKIN/64

Hz nom

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

INL2

±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

HIGH LEVEL ANALOG INPUT CHANNEL (AIN3)

AIN3 is with respect to HICOM

AIN3 Voltage Range

+10

V max

−10

V min

Normal Mode 50 Hz Rejection

78

dB typ

For filter notches of 10 Hz, 25 Hz, 50 Hz; ±0.02 × fNOTCH

Normal Mode 60 Hz Rejection

78

dB typ

For filter notches of 10 Hz, 20 Hz, 60 Hz; ±0.02 × fNOTCH

AIN3 Input Sampling Rate, fS

Gain × fCLKIN/64

Hz nom

For gains of 1 to 4

fCLKIN/8

Hz nom

For gains of 8 to 128

AIN3 Input Impedance2

27

kΩ min

Typically 30 kΩ ± 10%; typical resistor

Tempco is −30 ppm/°C

AIN3 Sampling Capacitance2

10

pF max

VBIAS Input Range

0 V/AVDD

V min/max

Typically REFIN(+) = 2.5 V

LOGIC INPUTS

Input Current

All Inputs Except MCLK IN

±1

μA max

Typically ±20 nA

MCLK

±10

μA max

Typically ±2 m A

All Inputs Except SCLK and MCLK IN

VINL, Input Low Voltage

0.8

V max

DVDD = 5 V

0.4

V max

DVDD = 3 V

VINH, Input High Voltage

2.0

V max

DVDD = 3 V and 5 V

SCLK Only (Schmitt Triggered Input)

DVDD = 5 V nominal

VT+

1.4/3

V min/V max

VT−

0.8/1.4

V min/V max

VT+ − VT−

0.4/0.8

V min/V max

SCLK Only (Schmitt Triggered Input)

DVDD = 3 V nominal

VT+

1/2.5

V min/V max

VT−

0.4/1.1

V min/V max

VT+ − VT−

0.375/0.8

V min /V max

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