ADS8028

www.ti.com

SBAS549B – MAY 2011 – REVISED MARCH 2012

ELECTRICAL CHARACTERISTICS

Minimum and maximum specifications apply from TA = –40°C to +125°C. Typical specifications are at TA = +25°C.

All specifications at AVDD = 2.7 V to 5.25 V, DVDD = 1.65 V to 5.25 V, fSAMPLE = 1 MHz, fSCLK = 20 MHz, and VREF = 2.5 V

internal, unless otherwise noted.

ADS8028

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

ANALOG INPUTS

AINx

Analog input voltage

0

VREF

V

In sample mode

40

pF

Input capacitance

In hold mode

8

pF

Input bias current

±0.01

µA

SAMPLING DYNAMICS

SCLK = 20 MHz

660

700

ns

Conversion time

TSENSE temperature sensor channel

100

µs

Acquisition time

Full-scale step input

100

ns

SCLK = 20 MHz, AINx channel

1

MSPS

Throughput rate

SCLK = 20 MHz, temperature

10

kSPS

measurement channel

Aperture delay

14

ns

At 3 dB

30

MHz

Full-power bandwidth

At 0.1 dB

10

MHz

Step response

100

ns

Overload recovery

100

ns

DC ACCURACY

Resolution

12

Bits

No missing codes

12

Bits

INL

Integral nonlinearity

±0.5

±1

LSB

DNL

Differential nonlinearity

±0.5

±0.99

LSB

Offset error

±2

±4.5

LSB

Offset error matching

±2.5

±4.5

LSB

Offset temperature drift

4

ppm/°C

Gain error

±1

±4

LSB

Gain error matching

±1

±2.5

LSB

Gain temperature drift

0.5

ppm/°C

DYNAMIC PERFORMANCE

SNR

Signal-to-noise ratio

50-kHz input, –0.5 dBFS

70

72

dB

SINAD

Signal-to-noise and distortion ratio

50-kHz input, –0.5 dBFS

70

71

dB

THD

Total harmonic distortion

50-kHz input, –0.5 dBFS

–82

–77

dB

SFDR

Spurious-free dynamic range

50-kHz input, –0.5 dBFS

77.5

84

dB

fA = 40.1 kHz, fB = 41.5 kHz

IMD

Intermodulation distortion

Second-order terms

–84

dB

Third-order terms

–93

dB

Channel-to-channel isolation

fIN = 50 kHz, fNOISE = 60 kHz

–100

dB

INTERNAL REFERENCE OUTPUT

Reference output voltage

±0.3% maximum at +25°C

2.4925

2.5

2.5075

V

Long-term stability

150

ppm

Output voltage hysteresis

50

ppm

Internal reference output impedance

1

Ω

Internal reference temperature coefficient

12

35(1)

ppm/°C

Internal reference noise

10-MHz bandwidth

60

µVRMS

(1)

Sample tested during initial release to ensure compliance.

Copyright © 2011–2012, Texas Instruments Incorporated

Submit Documentation Feedback

3

Product Folder Link(s): ADS8028