ADS8512IDW datasheet(3/32 Pages) TI

tên linh kiện	ADS8512IDW

Giải thích chi tiết về linh kiện	12-Bit, 40-kSPS, Low Power Sampling ANALOG-TO-DIGITAL CONVERTER with Internal Reference and Serial Interface

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ADS8512

www.ti.com ...................................................................................................................................................................................................... SLAS485 – JUNE 2008

ELECTRICAL CHARACTERISTICS (continued)

At TA = -40°C to +85°C, fS = 40 kHz, VS = 5 V, and using internal reference and fixed resistors, unless otherwise specified.

ADS8512I

ADS8512IB

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

MIN

TYP

MAX

UNIT

DC ACCURACY

INL

Integral linearity error

–1

±0.1

1

–0.5

±0.1

0.5

LSB(1)

DNL

Differential linearity error

–1

±0.1

1

–0.5

±0.1

0.5

LSB

No missing codes

12

Bits

Transition noise(2)

0.05

LSB

Gain error

±0.2

±0.1

%

Full scale error(3)(4)

-0.5

0.5

–0.25

0.25

%

Full scale error drift

±10

ppm/°C

Full scale error(3)(4)

External 2.5-V reference

–0.5

0.5

–0.25

0.25

%

Full scale error drift

External 2.5-V reference

±0.5

ppm/°C

Bipolar zero error(3)

Bipolar ranges

–10

10

–5

5

mV

Bipolar zero error drift

Bipolar ranges

±2

ppm/°C

Unipolar zero error(3)

Unipolar ranges

–6

6

–6

6

mV

Unipolar zero error drift

Unipolar ranges

±3

ppm/°C

Recovery time to rated accuracy from

1-

µF capacitor to CAP

300

µs

power down(5)

Power-supply sensitivity

+4.75 V < VS < +5.25 V

±0.75

LSB

AC ACCURACY

SFDR

Spurious-free dynamic range

fIN = 1 kHz, ±10 V

80

98

80

98

dB(6)

THD

Total harmonic distortion

fIN = 1 kHz, ±10 V

–96

–80

–98

–80

dB

fIN = 1 kHz, ±10 V

70

74

72

74

SINAD

Signal-to-(noise+distortion)

dB

–60 dB input

30

32

SNR

Signal-to-noise

fIN = 1 kHz, ±10 V

70

74

72

74

dB

Usable bandwidth(7)

130

kHz

Full-power bandwidth (–3 dB)

600

kHz

SAMPLING DYNAMICS

Aperture delay

40

ns

Aperture jitter

20

ps

Transient response

FS step

5

µs

Overvoltage recovery(8)

750

ns

REFERENCE

Internal reference voltage

No load

2.48

2.5

2.52

2.48

2.5

2.52

V

Internal reference source current (must

1

µA

use external buffer)

Internal reference drift

8

ppm/°C

External reference voltage range for

2.3

2.5

2.7

2.3

2.5

2.7

V

specified linearity

External reference current drain

External 2.5-V reference

100

µA

(1)

LSB means least significant bit. 1 LSB for the ±10 V input range is 305

µV.

(2)

Typical rms noise at worst-case transitions.

(3)

As measured with fixed resistors. Adjustable to zero with external potentiometer.

(4)

Full-scale error is the worst case of –Full Scale or +Full Scale deviation from ideal first and last code transitions, divided by the full-scale

range; includes the effect of offset error. Tested at –40°C to +85°C.

(5)

Time delay after the ADS8512 is brought out of Power-Down mode until all internal settling occurs and the analog input is acquired to

rated accuracy. A Convert command after this delay yields accurate results.

(6)

All specifications in dB are referred to a full-scale input.

(7)

Usable bandwidth defined as full-scale input frequency at which Signal-to-(Noise + Distortion) degrades to 60 dB.

(8)

Recovers to specified performance after 2 x FS input overvoltage.

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