AD7687

Data Sheet

Rev. E | Page 4 of 26

SPECIFICATIONS

Table 2.

Parameter

Test Conditions/Comments

Min

Typ

Max

Unit

RESOLUTION

16

Bits

ANALOG INPUT

Voltage Range

IN+ − IN−

V

Absolute Input Voltage

IN+ and IN−

−0.1

V

Common-Mode Input Range

IN+ and IN−

0

V

Analog Input CMRR

65

dB

Leakage Current at 25°C

Acquisition phase

1

nA

Input Impedance

See the Analog Input section

ACCURACY

No Missing Codes

16

Bits

Differential Linearity Error

−1

±0.4

+1

LSB1

Integral Linearity Error

−1.5

±0.4

+1.5

LSB

Transition Noise

REF = VDD = 5 V

0.35

LSB

±2

±6

LSB

Gain Error Temperature Drift

±0.3

ppm/°C

VDD = 4.5 V to 5.5 V

±0.1

±1.6

mV

VDD = 2.3 V to 4.5 V

±0.7

±3.5

mV

Offset Temperature Drift

±0.3

ppm/°C

Power Supply Sensitivity

VDD = 5 V ± 5%

±0.05

LSB

THROUGHPUT

Conversion Rate

VDD = 4.5 V to 5.5 V

0

250

kSPS

VDD = 2.3 V to 4.5 V

0

200

kSPS

Transient Response

Full-scale step

1.8

µs

AC ACCURACY

Dynamic Range

95.8

96.5

dB3

Signal-to-Noise Ratio

94

95.5

dB

92

92.5

dB

Spurious-Free Dynamic Range

−118

dB

Total Harmonic Distortion

−118

dB

Signal-to-(Noise + Distortion) Ratio

94

95

dB

36.5

dB

92

92.5

dB

115

dB

1

LSB means least significant bit. With the ±5 V input range, one LSB is 152.6 µV.

2

See the Terminology section. These specifications do include full temperature range variation but do not include the error contribution from the external reference.

3

All specifications in dB are referred to a full-scale input FSR. Tested with an input signal at 0.5 dB below full-scale, unless otherwise specified.

4