ADS7828-Q1

SBAS456B – DECEMBER 2008 – REVISED JANUARY 2016

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6.7 Electrical Characteristics for ADS7828E

+VDD = 5 V, VREF = External 5 V, SCL clock frequency = 3.4 MHz (high-speed mode), over operating free-air temperature

range, unless otherwise noted.

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

Analog Input

Ileak

Leakage current

±1

µA

CI

25

pF

Overall Performance

No missing codes

12

bits

Integral linearity error

±1

±2

LSB(1)

Differential linearity error

±1

LSB

Offset error

±1

±3

LSB

Offset error match

±1.5

LSB

Gain error

±1

±3

LSB

Gain error match

±1

LSB

Vn

Noise

RMS

33

µV

PSRR

Power-supply ripple rejection

82

dB

Sampling Dynamics

High-speed mode: SCL = 3.4 MHz

50

Throughput frequency

Fast mode: SCL = 400 kHz

8

kHz

Standard mode: SCL = 100 kHz

2

Conversion time

6

µs

AC Accuracy

THD

Total harmonic distortion(2)

VIN = 25 VPP at 10 kHz

–82

dB

Signal-to-noise ratio

VIN = 25 VPP at 10 kHz

72

dB

Signal-to-(noise + distortion) ratio

VIN = 25 VPP at 10 kHz

71

dB

Spurious-free dynamic range

VIN = 25 VPP at 10 kHz

86

dB

Channel-to-channel isolation

120

dB

Voltage Reference Output

VO

Output voltage

2.475

2.5

2.525

V

Internal reference drift

15

ppm/°C

Internal reference on

110

Ω

zo

Output impedance

Internal reference off

1

G

Ω

IQ

Quiescent current

1300

µA

Voltage Reference Input

rI

Input resistance

1

G

Ω

Current drain

20

µA

Digital Input and Output

VOL

Low-level output voltage

Minimum 3-mA sink current

0.4

V

IIH

High-level input current

VIH = +VDD + 0.5 V

10

µA

IIL

Low-level input current

VIL = –0.3 V

–10

µA

(1)

LSB means Least Significant Bit; with VREF equal to 5 V, one LSB is 1.22 mV.

(2)

THD is measured to the ninth harmonic.

8

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