AFE0064

SLAS672 – SEPTEMBER 2009 ........................................................................................................................................................................................ www.ti.com

SPECIFICATIONS (continued)

TA = 25 to 85°C, +VDD = 3.3 V, fCLK = 15 MHz for sequential mode and 3.75 MHz for simultaneous mode, scan time = 28.32

µs (unless otherwise noted)

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

ACCURACY

C-sensor(1)1= 30 pF, Range 3, 14 µSec

824

integration time

Noise in electrons referred to input of

C-sensor(1) = 20 pF, Range 3 14 µSec integration

600

e-

integrator

time

C-sensor(1)= 30 pF, Range 3, 270 µSec

1400

integration time

Integral nonlinearity

±0.006

% of

FSR(2)

Analog input channel leakage current

This current is integrated and reflects as a part of

2

pA

offset error.

Channel to channel full-scale error

For ranges 3 to 7

±0.7

% of

matching

FSR(2)

Offset error

Device output offset, resulting from integration of

±0.07

% of

input leakage current

FSR(2)

Channel to channel offset error

±0.07

% of

matching

FSR(2)

Integrator input offset:(difference

Integrator input offset mean across channels

±0.002

mV

between integrator positive and

negative terminal)

Integrator input offset matching across

±3 sigma limit of integrator input offset across

±1.5

mV

channels

channels

Channel to channel crosstalk

Aggressor channel with full scale charge to next

0.08

% of

adjacent channel

FSR(2)

EXTERNAL REFERENCE INPUT

REFP

2.24

2.25

+VDD -

V

0.85

REFM

0.84

0.85

0.86

V

Input current

50

nA

P_REF output

1.68

V

P_REF current source capacity

±1

mA

POWER SUPPLY REQUIREMENTS

Power supply voltage, +VDD

3.2

3.3

3.6

During operation

53

58

mA

Power supply current

During NAP

15

mA

Power up time from NAP

10

µSec

DIGITAL INPUT OUTPUT

Logic levels

VIH

0.8×VDD

VDD+0.1

VIL

–0.1

0.2×VDD

VOH

IOH = -500 µA

VDD–0.4

VOL

IOL = 500 µA

0.4

TEMPERATURE RANGE

Operating free air

0

85

°C

(1)

C-Sensor is total external capacitance seen at IN(x) pin. This includes capacitance of all the TFT switches connected to that node and

the routing capacitance.

(2)

FSR is full-scale range. There are eight ranges from 0.13 pC to 9.6 pC.

4

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