AD7944 datasheet(3/28 Pages) AD

Teilenummer	AD7944

Bauteilbeschribung	14-Bit, 2.5 MSPS, PulSAR 15.5 mW ADC in LFCSP

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AD7944

Rev. 0 | Page 3 of 28

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

Test Conditions/Comments

Min

Typ

Max

Unit

RESOLUTION

14

Bits

ANALOG INPUT

Voltage Range

(IN+) − (IN−)

0

VREF

V

Absolute Input Voltage

IN+

−0.1

VREF + 0.1

V

IN−

−0.1

+0.1

V

Leakage Current at 25°C

Acquisition phase

250

nA

Input Impedance

See the Analog Inputs section

ACCURACY

No Missing Codes

14

Bits

Differential Nonlinearity Error, DNL

−0.90

±0.25

+0.90

LSB1

Integral Nonlinearity Error, INL

−1.00

±0.25

+1.00

LSB1

Transition Noise

0.9

LSB1

Gain Error2

TMIN to TMAX

−15

±2

+15

LSB1

Gain Error Temperature Drift

±0.8

ppm/°C

Zero Error2

TMIN to TMAX

−0.65

±0.08

+0.65

mV

Zero Error Temperature Drift

0.55

ppm/°C

Power Supply Sensitivity3

AVDD = 2.5 V ± 5%

84.3

dB

THROUGHPUT

Conversion Rate

0

2.5

MSPS

Transient Response

Full-scale step

100

ns

AC ACCURACY3

Dynamic Range

VREF = 4.096 V, internal reference

83.5

84.5

dB

VREF = 5.0 V, external reference

84

85

dB

Signal-to-Noise Ratio, SNR

fIN = 20 kHz

VREF = 4.096 V, internal reference

83.5

84

dB

VREF = 5.0 V, external reference

84

84.5

dB

Spurious-Free Dynamic Range, SFDR

fIN = 20 kHz

103

dB

Total Harmonic Distortion, THD4

fIN = 20 kHz, VREF = 4.096 V, internal

reference

−102

dB

Signal-to-Noise-and-Distortion Ratio,

SINAD

fIN = 20 kHz, VREF = 4.096 V

84

dB

SAMPLING DYNAMICS

−3 dB Input Bandwidth

19

MHz

Aperture Delay

0.7

ns

1 LSB means least significant bit. With the ±4.096 V input range, one LSB is 250 μV.

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

3 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.

4 Tested fully in production at fIN = 1 kHz.

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