ADS1602

SBAS341B − DECEMBER 2004 − REVISED APRIL 2005

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13

TYPICAL CHARACTERISTICS (continued)

All specifications at TA = 25°C, AVDD = 5V, DVDD = IOVDD = 3V, fCLK = 40MHz, External VREF = +3V, VCM = +1.45V, and RBIAS = 37kΩ,

unless otherwise noted.

Figure 27

SIGNAL−TO−NOISE RATIO

vs CLOCK FREQUENCY

Clock Frequency, f

5

1015

202530

354045

50

100

90

80

70

60

50

40

30

V

R

R

R

BIAS

=140k

Ω

R

BIAS

= 100k

Ω

R

BIAS

= 60k

Ω

R

R

Figure 28

TOTAL HARMONIC DISTORTION

vs CLOCK FREQUENCY

Clock Frequency, f

110

100

90

80

70

60

50

40

30

20

5

10

15

202530354045

50

V

R

R

R

R

BIAS

= 100k

Ω

R

BIAS

=30k

Ω

R

BIAS

= 60k

Ω

R

Figure 29

SPURIOUS−FREE DYNAMIC RANGE

vs CLOCK FREQUENCY

Clock Frequency, f

110

100

90

80

70

60

50

40

30

20

5

10

15

202530354045

50

V

R

R

R

R

BIAS

=100k

Ω

R

BIAS

= 30k

Ω

R

BIAS

=60k

Ω

R

Figure 30

1000

100

10

1

0.1

−3

−2

−13

01

2

Input DC Voltage (V)

NOISE vs DC INPUT VOLTAGE

Figure 31

1540

1400

1300

1200

1100

1000

900

800

700

600

500

400

300

200

100

0

−4

−3

−2

−10

1

2

3

4

Output Code (LSB)

NOISE HISTOGRAM

V

Figure 32

120

100

80

60

40

20

0

−40

−15

10

35

60

85

Temperature (

_C)

POWER−SUPPLY CURRENT

vs TEMPERATURE

I

I

R

I