AD7147 Просмотр технического описания (PDF) - Analog Devices

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AD7147

CapTouch Programmable Controller for Single-Electrode Capacitance Sensors

Analog Devices 

AD7147

Data Sheet

SPECIFICATIONS

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

Table 1.

Parameter

Min

Typ

CAPACITANCE-TO-DIGITAL CONVERTER

Update Rate

8.73

9

17.46

18

34.9

36

Resolution

16

CINx Input Range

±8

No Missing Codes

16

Max

9.27

18.54

37.1

CINx Input Leakage

Maximum Output Load

Total Unadjusted Error

Output Noise (Peak-to-Peak)

Output Noise (RMS)

CSTRAY Offset Range

CSTRAY Offset Resolution

Low Power Mode Delay Accuracy

25

20

±20

12

7

3

1.1

0.8

0.5

20

0.32

4

ACSHIELD

Frequency

250

Output Voltage

0

VCC

Short-Circuit Source Current

10

Short-Circuit Sink Current

10

Maximum Output Load

150

LOGIC INPUTS (SDI, SCLK, CS, SDA, GPIO)

VIH Input High Voltage

0.7 × VDRIVE

VIL Input Low Voltage

0.4

IIH Input High Current

−1

IIL Input Low Current

1

Hysteresis

150

OPEN-DRAIN OUTPUTS (SCLK, SDA, INT)

VOL Output Low Voltage

0.4

IOH Output High Leakage Current

±0.1

±1

LOGIC OUTPUTS (SDO, GPIO)

VOL Output Low Voltage

VOH Output High Voltage

0.4

VDRIVE − 0.6

GPIO, SDO Floating State Leakage

±1

Current

POWER

VCC

2.6

3.3

3.6

VDRIVE

1.65

3.6

ICC

0.9

1

15.5

21.5

2.3

7.5

Unit Test Conditions/Comments

ms

ms

ms

Bits

pF

Bits

nA

pF

%

Codes

Codes

Codes

Codes

Codes

Codes

pF

pF

%

12 conversion stages, decimation = 64

12 conversion stages, decimation = 128

12 conversion stages, decimation = 256

Guaranteed by design, but not production

tested

Capacitance load on CINx to ground

Decimation rate = 64

Decimation rate = 128

Decimation rate = 256

Decimation rate = 64

Decimation rate = 128

Decimation rate = 256

Percentage of 200 ms, 400 ms, 600 ms,

or 800 ms

kHz

V

Oscillating

mA

mA

pF

Capacitance load on ACSHIELD to ground

V

V

µA

VIN = VDRIVE

µA

VIN = GND

mV

V

ISINK = −1 mA

µA

VOUT = VDRIVE

V

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

V

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

µA

Pin three-state, leakage measured to

GND and VCC

V

V

Serial interface operating voltage

mA

In full power mode, VCC + VDRIVE

µA

Low power mode, converter idle, VCC + VDRIVE,

decimation = 256

µA

Full shutdown, VCC + VDRIVE

Rev. E | Page 4 of 70

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