ADS8674IDBT datasheet(8/79 Pages) TI1

No. de pieza	ADS8674IDBT

Descripción Electrónicos	4- and 8-Channel, Single-Supply, SAR ADCs

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Fabricante Electrónico	TI1 [Texas Instruments]

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8 / 79 page

ADS8674, ADS8678

SBAS627 – JULY 2015

www.ti.com

Electrical Characteristics (continued)

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

AVDD = 5 V, DVDD = 3 V, VREF = 4.096 V (internal), and fSAMPLE = 500 kSPS, unless otherwise noted.

TEST

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

LEVEL(1)

DYNAMIC CHARACTERISTICS

Input range = ±2.5 × VREF

84.5

85

A

Input range = ±1.25 × VREF

84.2

85

A

Input range = ±0.625 × VREF

83.5

84.5

A

Input range = ±0.3125 × VREF

80

82

A

Signal-to-noise ratio

SNR

Input range = ±0.15625 × VREF

75

77

dB

A

(VIN – 0.5 dBFS at 1 kHz)

Input range = 2.5 × VREF

84

85

A

Input range = 1.25 × VREF

83.5

84.5

A

Input range = 0.625 × VREF

80

82

A

Input range = 0.3125 × VREF

75

77

A

Total harmonic distortion(7)

THD

All input ranges

–100

dB

B

(VIN – 0.5 dBFS at 1 kHz)

Input range = ±2.5 × VREF

84.3

84.8

A

Input range = ±1.25 × VREF

84

84.8

A

Input range = ±0.625 × VREF

83.3

84.3

A

Input range = ±0.3125 × VREF

80

82

A

Signal-to-noise ratio

SINAD

Input range = ±0.15625 × VREF

75

77

dB

A

(VIN – 0.5 dBFS at 1 kHz)

Input range = 2.5 × VREF

83.8

84.8

A

Input range = 1.25 × VREF

83.3

84.3

A

Input range = 0.625 × VREF

80

82

A

Input range = 0.3125 × VREF

75

77

A

Spurious-free dynamic range

SFDR

All input ranges

101

dB

B

(VIN – 0.5 dBFS at 1 kHz)

Aggressor channel input overdriven

Crosstalk isolation(8)

110

dB

B

to 2 × maximum input voltage

Aggressor channel input overdriven

Crosstalk memory(9)

90

dB

B

to 2 × maximum input voltage

BW(–3 dB)

Small-signal bandwidth, –3 dB

At TA = 25°C, all input ranges

15

kHz

B

BW(–0.1 dB)

Small-signal bandwidth, –0.1 dB

At TA = 25°C, all input ranges

2.5

kHz

B

AUXILIARY CHANNEL

Resolution

14

Bits

A

V(AUX_IN)

AUX_IN voltage range

(AUX_IN – AUX_GND)

0

VREF

V

A

AUX_IN

0

VREF

V

A

Operating input range

AUX_GND

0

V

A

During sampling

75

pF

C

Ci

Input capacitance

During conversion

5

pF

C

IIkg(in)

Input leakage current

100

nA

A

DNL

Differential nonlinearity

–0.75

±0.5

0.75

LSB

A

INL

Integral nonlinearity

–1

±0.5

1

LSB

A

EG(AUX)

Gain error

At TA = 25°C

±0.02

±0.2

%FSR

A

EO(AUX)

Offset error

At TA = 25°C

–5

5

mV

A

SNR

Signal-to-noise ratio

V(AUX_IN) = –0.5 dBFS at 1 kHz

83.3

84.4

dB

A

THD

Total harmonic distortion(7)

V(AUX_IN) = –0.5 dBFS at 1 kHz

–100

dB

B

SINAD

Signal-to-noise + distortion

V(AUX_IN) = –0.5 dBFS at 1 kHz

83

84.3

dB

A

SFDR

Spurious-free dynamic range

V(AUX_IN) = –0.5 dBFS at 1 kHz

100

dB

B

(7)

Calculated on the first nine harmonics of the input frequency.

(8)

Isolation crosstalk is measured by applying a full-scale sinusoidal signal up to 10 kHz to a channel, not selected in the multiplexing

sequence, and measuring its effect on the output of any selected channel.

(9)

Memory crosstalk is measured by applying a full-scale sinusoidal signal up to 10 kHz to a channel that is selected in the multiplexing

sequence, and measuring its effect on the output of the next selected channel for all combinations of input channels.

8

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