AD7142 datasheet(3/68 Pages) AD

Part #	AD7142

Description	Programmable Capacitance-to-Digital Converter with Environmental Compensation

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Manufacturer	AD [Analog Devices]

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AD7142

Rev. 0 | Page 3 of 68

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 = 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 x 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

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