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AD7685
(Rev.:2014)

16-Bit, 250 kSPS PulSAR ADC in MSOP

Analog Devices 

Data Sheet

AD7685

SPECIFICATIONS

VDD = 2.3 V to 5.5 V, VIO = 2.3 V to VDD, VREF = VDD, TA = –40°C to +85°C, unless otherwise noted.

Table 2.

Parameter

RESOLUTION

ANALOG INPUT

Voltage Range

Absolute Input Voltage

Analog Input CMRR

Leakage Current at 25°C

Input Impedance

Test Conditions

IN+ − IN−

IN+

IN−

fIN = 250 kHz

Acquisition phase

ACCURACY

No Missing Codes

Differential Linearity Error

Integral Linearity Error

Transition Noise

Gain Error2, TMIN to TMAX

Gain Error Temperature Drift

Offset Error2, TMIN to TMAX

Offset Temperature Drift

Power Supply Sensitivity

THROUGHPUT

Conversion Rate

Transient Response

AC ACCURACY

Signal-to-Noise Ratio

Spurious-Free Dynamic

Range

Total Harmonic Distortion

Signal-to-(Noise + Distortion)

Intermodulation Distortion4

REF = VDD = 5 V

VDD = 4.5 V to 5.5 V

VDD = 2.3 V to 4.5 V

VDD = 5 V ± 5%

VDD = 4.5 V to 5.5 V

VDD = 2.3 V to 4.5 V

Full-scale step

fIN = 20 kHz,

VREF = 5 V

fIN = 20 kHz,

VREF = 2.5 V

fIN = 20 kHz

fIN = 20 kHz

fIN = 20 kHz,

VREF = 5 V

fIN = 20 kHz,

VREF = 5 V,

−60 dB input

fIN = 20 kHz,

VREF = 2.5 V

A Grade

B Grade

C Grade

Min Typ Max Min Typ Max Min Typ Max Unit

16

16

16

Bits

0

VREF

0

VREF

0

VREF

V

−0.1

VDD + −0.1

VDD + −0.1

VDD + V

0.1

0.1

0.1

−0.1

+0.1 −0.1

+0.1 −0.1

+0.1 V

65

65

65

dB

1

1

1

nA

See the

Analog Inputs section

See the

Analog Inputs section

See the

Analog Inputs section

15

16

16

Bits

−1 ±0.7

−1 ±0.5 +1.5 LSB1

−6

+6

−3 ±1

+3

−2 ±0.6 +2

LSB

0.5

0.5

0.45

LSB

±2

±30

±2

±30

±2

±15

LSB

±0.3

±0.3

±0.3

ppm/°C

±0.1 ±1.6

±0.1 ±1.6

±0.1 ±1.6 mV

±0.7 ±3.5

±0.7 ±3.5

±0.7 ±3.5 mV

±0.3

±0.3

±0.3

ppm/°C

±0.05

±0.05

±0.05

LSB

0

250

0

250

0

250

kSPS

0

200

0

200

0

200

kSPS

1.8

1.8

1.8

µs

90

90 92

91.5 93.5

dB 3

86

86 88

87.5 88.5

dB

−100

−106

−110

dB

−100

−106

−110

dB

89

90 92

91.5 93.5

dB

32

33.5

dB

86

85.5 87.5

87 88.5

dB

−110

−115

dB

1 LSB means least significant bit. With the 5 V input range, 1 LSB is 76.3 µV.

2 See 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 FS. Tested with an input signal at 0.5 dB below full-scale, unless otherwise specified.

4 fIN1 = 21.4 kHz, fIN2 = 18.9 kHz, each tone at −7 dB below full scale.

Rev. D | Page 3 of 28

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