ADS8665IPW datasheet(6/71 Pages) TI1

tên linh kiện	ADS8665IPW

Giải thích chi tiết về linh kiện	12-Bit, High-Speed, Single-Supply, SAR ADC Data Acquisition System with Programmable, Bipolar Input Ranges

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ADS8661, ADS8665

SBAS780 – DECEMBER 2016

www.ti.com

Product Folder Links: ADS8661 ADS8665

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Electrical Characteristics (continued)

all minimum and maximum specifications are at TA = –40°C to +125°C; typical specifications are at TA = 25°C; AVDD = 5 V,

DVDD = 3.3 V, VREF = 4.096 V (internal), and maximum throughput (unless otherwise noted)

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

(2)

This specification indicates the endpoint INL, not best-fit INL.

(3)

Measured relative to actual measured reference.

(4)

Bipolar ranges are ±12.288 V, ±10.24 V, ±6.144 V, ±5.12 V, and ±2.56 V.

(5)

Unipolar ranges are 0 V–12.288 V, 0 V–10.24 V, 0 V–6.144 V, and 0 V–5.12 V.

(6)

Excludes internal reference accuracy error.

(7)

Excludes internal reference temperature drift.

(8)

All specifications expressed in decibels (dB) refer to the full-scale input (FSR) and are tested with a 1-kHz input signal 0.25 dB below

full-scale, unless otherwise specified.

(9)

Calculated on the first nine harmonics of the input frequency.

SYSTEM PERFORMANCE

Resolution

12

Bits

NMC

No missing codes

12

Bits

DNL

Differential nonlinearity(2)

All input ranges

–0.35

±0.1

0.35

LSB

INL

Integral nonlinearity(2)

All input ranges

–0.35

±0.15

0.35

LSB

EO

Offset error(3)

At TA = 25°C

All bipolar ranges(4)

–1

±0.2

1

mV

All unipolar ranges(5)

–2

±0.2

2

Offset error drift with temperature

All input ranges

–3

±0.75

3

ppm/°C

EG

Gain error(6)

At TA = 25°C, all input ranges

–0.025

±0.01

0.025

%FSR

Gain error drift with temperature(7)

All input ranges

–5

±1

5

ppm/°C

DYNAMIC CHARACTERISTICS

SNR

Signal-to-noise ratio(8)

All input ranges

73

73.5

dB

THD

Total harmonic distortion(9)(8)

All input ranges

–102

dB

SINAD

Signal-to-noise + distortion(8)

All input ranges

72.9

73.4

dB

SFDR

Spurious-free dynamic range(8)

All input ranges

103

dB

SAMPLING DYNAMICS

tCONV

Conversion time

ADS8661

550

ns

ADS8665

1000

tACQ

Acquisition time

ADS8661

250

ns

ADS8665

1000

fcycle

Maximum throughput rate

without latency

ADS8661

1250

kSPS

ADS8665

500

INTERNAL REFERENCE OUTPUT

VREFIO

On the REFIO pin

(configured as an output)

At TA = 25°C

TSSOP (PW)

4.095

4.096

4.097

V

WQFN (RUM)

4.094

4.096

4.098

dVREFIO/dTA

Internal reference temperature drift

TSSOP (PW)

4

ppm/°C

WQFN (RUM)

5

COUT_REFIO

Decoupling capacitor on REFIO pin

4.7

µF

VREFCAP

Reference voltage to the ADC

(on the REFCAP pin)

At TA = 25°C

4.095

4.096

4.097

V

REFCAP temperature drift

0.5

2

ppm/°C

COUT_REFCAP

Decoupling capacitor on REFCAP pin

10

μF

Turn-on time

COUT_REFCAP = 10 µF, COUT_REFIO = 10 µF

20

ms

EXTERNAL REFERENCE INPUT

VREFIO_EXT

External reference voltage on REFIO

REFIO pin configured as an input

4.046

4.096

4.146

V

AVDD COMPARATOR

VTH_HIGH

High threshold voltage

5.3

V

VTH_LOW

Low threshold voltage

4.7

V

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