AD7142_17 datasheet(4/70 Pages) AD

Il numero della parte	AD7142

Spiegazioni elettronici	Programmable Controller for Capacitance Touch Sensors

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Produttore elettronici	AD [Analog Devices]

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4 / 70 page

AD7142

Data Sheet

Rev. B | Page 4 of 70

SPECIFICATIONS

AVCC, DVCC = 2.6 V to 3.6 V, TA = −40oC to +85°C, unless otherwise noted.

Table 1.

Parameter

Min

Typ

Max

Unit

Test Conditions/Comments

CAPACITANCE-TO-DIGITAL CONVERTER

Update Rate

35.45

36.86

38.4

ms

12 conversion stages in sequencer, decimation rate = 256

Resolution

16

Bit

CIN Input Range1

±2

pF

No Missing Codes

16

Bit

Guaranteed by design, but not production tested

CIN Input Leakage

25

nA

Total Unadjusted Error

±20

%

Output Noise (Peak-to-Peak)

7

Codes

Decimation rate = 128

3

Codes

Decimation rate = 256

Output Noise (RMS)

0.8

Codes

Decimation rate = 128

0.5

Codes

Decimation rate = 256

Parasitic Capacitance

40

pF

Parasitic capacitance to ground, per CIN input

guaranteed by characterization

CBULK Offset Range1

±20

pF

CBULK Offset Resolution

156.25

fF

Low Power Mode Delay Accuracy

4

%

% of 200 ms, 400 ms, 600 ms, or 800 ms

EXCITATION SOURCE

Frequency

240

250

260

kHz

Output Voltage

AVCC

V

Short-Circuit Source Current

20

mA

Short-Circuit Sink Current

50

mA

Maximum Output Load

250

pF

Capacitance load on source to ground

CSHIELD Output Drive

10

µA

CSHIELD Bias Level

AVCC/2

V

LOGIC INPUTS (SDI, SCLK, CS, SDA, GPI TEST)

VIH Input High Voltage

0.7 × VDRIVE

V

VIL Input Low Voltage

0.4

V

IIH Input High Voltage

−1

µA

VIN = VDRIVE

IIL Input Low Voltage

1

µA

VIN = DGND

Hysteresis

150

mV

OPEN-DRAIN OUTPUTS (SCLK, SDA, INT)

VOL Output Low Voltage

0.4

V

ISINK = −1 mA

IOH Output High Leakage Current

0.1

±1

µA

VOUT = VDRIVE

LOGIC OUTPUTS (SDO, GPO)

VOL Output Low Voltage

0.4

V

ISINK = 1 mA, VDRIVE = 1.65 V to 3.6 V

VOH Output High Voltage

VDRIVE − 0.6

V

ISOURCE = 1 mA, VDRIVE = 1.65 V to 3.6 V

SDO Floating State Leakage Current

±1

µA

Pin three-state, leakage measured to GND and DVCC

GPO Floating State Leakage Current

−5

2

µA

Pin three-state, leakage measured to GND and DVCC

POWER

AVCC, DVCC

2.6

3.3

3.6

V

VDRIVE

1.65

3.6

V

Serial interface operating voltage

ICC

0.9

1

mA

In full power mode

20

µA

Low power mode, converter idle, TA = 25°C

16

33

µA

Low power mode, converter idle

4.5

µA

Full shutdown, TA = 25°C

2.25

18

µA

Full shutdown

1

CIN and CBULK are defined in Figure 2.

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