ADS7890IPFBT.B datasheet(13/28 Pages) TI2

13 / 28 page

ADS7890

SLAS409 − DECEMBER 2003

www.ti.com

TYPICAL CHARACTERISTICS(1)

Figure 13

1124

3128

658

500

1000

1500

2000

2500

3000

3500

8189 8190 8191 8192 8193 8194 8195

Code

DC CODE SPREAD AT CENTER OF CODE

+VA = 5 V,

+VBD = 5 V,

Code = 8192,

Sample Rate = 1.25 MSPS,

Vref = 2.5 V,

TA = 255C

Figure 14

12.1

12.2

12.3

12.4

12.5

12.6

12.7

12.8

12.9

−40

−20

EFFECTIVE NUMBER OF BITS

FREE-AIR TEMPERATURE

TA − Free-Air Temperature − °C

fi = 100 kHz,

Sample Rate = 1.25 MSPS,

+VA = 5 V,

+VBD = 5 V,

Vref = 2.5 V

Figure 15

76.2

76.4

76.6

76.8

77.2

77.4

77.6

77.8

−40

−20

SIGNAL-TO-NOISE AND DISTORTION

FREE-AIR TEMPERATURE

TA − Free-Air Temperature − °C

fi = 100 kHz,

Sample Rate = 1.25 MSPS,

+VA = 5 V,

+VBD = 5 V,

Vref = 2.5 V

Figure 16

77.2

77.4

77.6

77.8

78.2

78.4

78.6

78.8

−40

−20

SIGNAL-TO-NOISE RATIO

FREE-AIR TEMPERATURE

TA − Free-Air Temperature − °C

fi = 100 kHz,

Sample Rate = 1.25 MSPS,

+VA = 5 V,

+VBD = 5 V,

Vref = 2.5 V

(1) Vref = 2.5 V external, unless otherwise specified.

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