ADS7844

6

SBAS100A

www.ti.com

0

–20

–40

–60

–80

–100

–120

FREQUENCY SPECTRUM

(4096 Point FFT; fIN = 1,129Hz, –0.2dB)

0

62.5

15.6

46.9

31.3

Frequency (kHz)

0

–20

–40

–60

–80

–100

–120

FREQUENCY SPECTRUM

(4096 Point FFT; fIN = 10.6kHz, –0.2dB)

0

62.5

15.6

46.9

31.3

Frequency (kHz)

SIGNAL-TO-NOISE RATIO AND SIGNAL-TO-

(NOISE+DISTORTION) vs INPUT FREQUENCY

10

1

100

Input Frequency (kHz)

78

74

70

66

62

58

54

SINAD

SNR

THD

SFDR

SPURIOUS FREE DYNAMIC RANGE AND TOTAL

HARMONIC DISTORTION vs INPUT FREQUENCY

10

1

100

Input Frequency (kHz)

90

85

80

75

70

65

60

55

50

–90

–85

–80

–75

–70

–65

–60

–55

–50

EFFECTIVE NUMBER OF BITS

vs INPUT FREQUENCY

10

1

100

Input Frequency (kHz)

12.0

11.5

11.0

10.5

10.0

9.5

9.0

TYPICAL PERFORMANCE CURVES:+2.7V

At TA = +25°C, +VCC = +2.7V, VREF = +2.5V, fSAMPLE = 125kHz, and fCLK = 16 • fSAMPLE = 2MHz, unless otherwise noted.

CHANGE IN SIGNAL-TO-(NOISE+DISTORTION)

vs TEMPERATURE

–20

–40

100

Temperature (˚C)

0.2

0.0

–0.2

–0.4

–0.6

–0.8

0.4

0

20

40

60

80

f

IN = 10kHz, –0.2dB