Data Sheet

AD8488

Rev. A | Page 3 of 20

SPECIFICATIONS

Default test conditions, unless otherwise specified: VDD = 5 V, VCC = 5 V, LPF resistor (R1) = 130 kΩ, base panel temperature = 30°C, Pin PWR = logic

low, G = 1 V/V, CH = 0.5 pF, and CPANEL = 38 pF.

Table 1.

Parameter

Test Conditions/Comments

Min

Typ

Max

Unit

INPUT LEAKAGE CURRENT

−10

−1.5

+10

pA/channel

CHARGE CONVERSION RATE1

See Figure 16

CF1 = 0.45 pF

1.7

2.3

2.9

V/pC

CF1 = 0.9 pF

0.85

1.1

1.4

V/pC

CF1 = 3.5 pF

0.21

0.28

0.36

V/pC

CF1 = 7 pF

0.10

0.14

0.18

V/pC

GAIN CHARACTERISTICS

Accuracy2

CF1 = 7 pF

G = 1

0.98

1

1.02

V/V

G = 2

1.96

2

2.04

V/V

G = 3

2.94

3

3.06

V/V

G = 4

3.92

4

4.08

V/V

G = 5

4.9

5

5.1

V/V

G = 6

5.88

6

6.12

V/V

G = 7

6.86

7

7.14

V/V

G = 8

7.84

8

8.16

V/V

G = 9

8.82

9

9.18

V/V

G = 10

9.8

10

10.2

V/V

Gain Step

Linear to 7 pC input charge

1

V/V

Error vs. Temperature3

0.003

%/°C

MAXIMUM INPUT CHARGE

CF1 = 0.45 pF

0.45

pC

CF1 = 0.9 pF

0.9

pC

CF1 = 3.5 pF

3.5

pC

CF1 = 7 pF

7

pC

CLOCK

Frequency

1

15

MHz

Rise and Fall Time

6

ns

LOGIC INTERFACE

WR, CF1SELx, FSELx, GNSELx, HOLD, GRST, IRST,

TSTx, CK_ENx, PWR, CS_A, CS_B

Input High

3.25

V

Input Low

1.15

V

Leakage Current

14.5e−6

1

µA

POWER SUPPLY

Analog Supply

Voltage (AVDD)

4.75

5

5.25

V

Quiescent Current (AIDD)

Pin PWR logic low

230

285

350

mA

Current in Low Power Mode

Pin PWR logic high

65

90

100

mA

Power Consumption

Normal

Pin PWR logic low

11

mW/channel

Low Power

Pin PWR logic high

4

mW/channel

Digital Supply

Voltage (DVDD)

4.75

5

5.25

V

Quiescent Current (DIDD)

2

10

mA

REFERENCE VOLTAGE

VREF

2.048

V