AD76881 查看數據表（PDF） - Analog Devices

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AD76881

18-Bit, 2 MSPS PulSAR 15 mW ADC in LFCSP (QFN)

Analog Devices 

AD7986

SPECIFICATIONS

AVDD = DVDD = 2.5 V, BVDD = 5 V, VIO = 1.8 V to 2.7 V, VREF = 4.096 V, TA = −40°C to +85°C, unless otherwise noted.

Table 2.

Parameter

RESOLUTION

ANALOG INPUT

Voltage Range

Absolute Input Voltage

Common-Mode Input Range

Analog Input CMRR

Leakage Current at 25°C

Input Impedance

ACCURACY

No Missing Codes

Differential Linearity Error

Integral Linearity Error

Transition Noise

Gain Error, TMIN to TMAX3

Gain Error Temperature Drift

Zero Error, TMIN to TMAX3

Zero Temperature Drift

Power Supply Sensitivity

THROUGHPUT

Conversion Rate

Transient Response

AC ACCURACY

Dynamic Range

Signal-to-Noise Ratio, SNR

Spurious-Free Dynamic Range, SFDR

Total Harmonic Distortion4, THD

Signal-to-(Noise + Distortion), SINAD

SAMPLING DYNAMICS

−3 dB Input Bandwidth

Aperture Delay

Conditions

Min

Typ

Max

Unit

18

Bits

(IN+) − (IN−)

IN+, IN−

IN+, IN−

fIN = 500 kHz

Acquisition phase

−VREF

+VREF

V

−0.1

VREF + 0.1

V

VREF × 0.475 VREF × 0.5 VREF × 0.525 V

100

dB1

250

nA

See the Analog Inputs section

AVDD = 2.5 V ± 5%

18

−0.95

−2.50

−20

−0.8

±0.60

±1.00

2.0

±2.4

±0.5

±0.3

±4

+1.50

+2.50

+20

+0.8

Bits

LSB2

LSB2

LSB2

LSB2

ppm/°C

mV

ppm/°C

LSB2

0

Full-scale step

2.00

MSPS

100

ns

VREF = 4.096 V, internal reference 95.5

VREF = 5.0 V, external reference

97

fIN = 20 kHz, VREF = 4.096 V, internal 94.5

reference

fIN = 20 kHz, VREF = 5.0 V, external 96.5

reference

fIN = 20 kHz

fIN = 20 kHz, VREF = 4.096 V, internal

reference

fIN = 20 kHz, VREF = 5.0 V, external

reference

fIN = 20 kHz, VREF = 4.096 V

94.5

96.5

98

95.5

97.0

−115

−113

−114

95.5

19

0.7

dB1

dB1

dB1

dB1

dB1

dB1

dB1

MHz

ns

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

2 LSB means least significant bit. With the ±4.096 V input range, one LSB is 31.25 µV.

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

4 Tested fully in production at fIN = 1 kHz.

Rev. B | Page 3 of 28

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