AD8488

Data Sheet

Rev. A | Page 16 of 20

TST6

TST5

TST4

TST3

TST2

TST1

TST0

Selects Channel

0

1

0

1

0

0

1

46

0

1

0

1

0

1

1

47

0

1

0

1

0

1

0

48

0

1

0

1

1

1

0

49

0

1

0

1

1

1

1

50

0

1

0

1

1

0

1

51

0

1

0

1

1

0

0

52

0

1

0

0

1

0

0

53

0

1

0

0

1

0

1

54

0

1

0

0

1

1

1

55

0

1

0

0

1

1

0

56

0

1

0

0

0

1

0

57

0

1

0

0

0

1

1

58

0

1

0

0

0

0

1

59

0

1

0

0

0

0

0

60

1

1

0

0

0

0

0

61

1

1

0

0

0

0

1

62

1

1

0

0

0

1

1

63

Table 9. Integrator Capacitor Content (CSEL0 and CSEL1)

CF1SEL1

CF1SEL0

CF1 (pF)

0

0

0.45

0

1

0.9

1

0

3.5

1

1

7.0

Table 10. Low-Pass Filter Time Constant—Resistor Selection Address Bits (FSEL0 and FSEL1)

FSEL1

FSEL0

R1 (kΩ)

Time Constant (µs)

0

0

195

1.5

0

1

130

1.0

1

0

65

0.5

1

1

0

0

Table 11. Gain Selection (Gain Amp/GNSEL0 to GNSEL3; CF2 = 0.5 pF)

GNSEL3 (CH3 = 1.5 pF)

GNSEL2 (CH2 = 2 pF)

GNSEL1 (CH = 1 pF)

GNSEL0 (CH = 0.5 pF)

Total CH (pF)

Gain

0

0

0

0

0

0

0

0

0

1

0.5

1

0

0

1

0

1

2

0

0

1

1

1.5

3

0

1

0

0

2

4

0

1

0

1

2.5

5

0

1

1

0

3

6

0

1

1

1

3.5

7

1

1

0

1

4

8

1

1

1

0

4.5

9

1

1

1

1

5

10