ADS1271

SBAS306F − NOVEMBER 2004 − REVISED OCTOBER 2007

www.ti.com

4

ELECTRICAL CHARACTERISTICS (continued)

All specifications at TA = −40°C to +105°C, AVDD = +5V, DVDD = +1.8V, fCLK = 27MHz, VREFP = 2.5V, and VREFN = 0V, unless otherwise noted.

Specified values for ADS1271 and ADS1271B (high-grade version) are the same, except where shown in BOLDFACE type.

ADS1271B

ADS1271

PARAMETER

UNITS

MAX

TYP

MIN

MAX

TYP

MIN

TEST CONDITIONS

Voltage Reference Inputs

Reference input voltage (VREF)

VREF = VREFP – VREFN

2.0

2.5

2.65

0.5

2.5

2.65

V

Negative reference input (VREFN)

AGND − 0.1

VREFP − 2.0

AGND − 0.1

VREFP − 0.5

V

Positive reference input (VREFP)

VREFN + 2.0

AVDD − 0.5

VREFN + 0.5

AVDD + 0.1

V

Reference

High-Speed mode

4.2

4.2

k

Ω

Reference

Input

impedance

High-Resolution mode

4.2

4.2

k

Ω

Input

impedance

Low-Power mode

8.4

8.4

k

Ω

Digital Input/Output

VIH

0.7 DVDD

DVDD

0.7 DVDD

DVDD

V

VIL

DGND

0.3 DVDD

DGND

0.3 DVDD

V

VOH

IOH = 5mA

0.8 DVDD

DVDD

0.8 DVDD

DVDD

V

VOL

IOL = 5mA

DGND

0.2 DVDD

DGND

0.2 DVDD

V

Input leakage(4)

0 < VIN DIGITAL < DVDD

±10

±10

µA

Master clock rate (fCLK)

0.1

27

0.1

27

MHz

SPI format

24 fDATA

fCLK

24 fDATA

fCLK

MHz

Serial clock

rate (f

)(5)

High-Speed mode

64 fDATA

64 fDATA

64 fDATA

64 fDATA

MHz

Serial clock

rate (fSCLK)(5)

Frame-Sync format

High-Resolution mode

128 fDATA

128 fDATA

128 fDATA

128 fDATA

MHz

SCLK

Frame-Sync format

Low-Power mode

64 fDATA

64 fDATA

64 fDATA

64 fDATA

MHz

Power Supply

AVDD

4.75

5

5.25

4.75

5

5.25

V

DVDD

1.65

3.6

1.65

3.6

V

High-Speed mode

17

25

17

25

mA

High-Resolution mode

17

25

17

25

mA

AVDD current

Low-Power mode

6.3

9.5

6.3

9.5

mA

AVDD current

Power-Down mode

T > 85

°C

1

70

1

70

µA

Power-Down mode

T

≤ 85°C

1

10

1

10

µA

High-Speed mode

3.5

6

3.5

6

mA

High-Resolution mode

2.5

5

2.5

5

mA

DVDD current

Low-Power mode

1.8

3.5

1.8

3.5

mA

DVDD current

Power-Down mode

T > 85

°C, DVDD = 3.3V

1

70

1

70

µA

Power-Down mode

T

≤ 85°C, DVDD = 3.3V

1

20

1

20

µA

Power

High-Speed mode

92

136

92

136

mW

Power

dissipation

High-Resolution mode

90

134

90

134

mW

dissipation

Low-Power mode

35

54

35

54

mW

Temperature Range

Specified

−40

+105

−40

+105

_C

Operating

−40

+105

−40

+105

_C

Storage

−60

+150

−60

+150

_C

(1) FSR = full-scale range = 2VREF.

(2) Minimum SNR is ensured by the limit of the DC noise specification.

(3) THD includes the first nine harmonics of the input signal.

(4) MODE and FORMAT pins excluded.

(5) See the text for more details on SCLK.