AD7147(Rev0) Просмотр технического описания (PDF) - Analog Devices

Номер в каталоге

Компоненты Описание

производитель

AD7147
(Rev.:Rev0)

CapTouch™ Programmable Controller for Single-Electrode Capacitance Sensors

Analog Devices 

AD7147

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

Short-Circuit Source Current

0

VCC

10

Short-Circuit Sink Current

10

Maximum Output Load

150

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

VIH Input High Voltage

VIL Input Low Voltage

IIH Input High Current

0.7 × VDRIVE

0.4

−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, GPO)

VOL Output Low Voltage

0.4

VOH Output High Voltage

VDRIVE − 0.6

GPO, SDO Floating State Leakage

±1

Current

POWER

VCC

VDRIVE

ICC

2.6

3.3

3.6

1.65

3.6

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. 0 | Page 3 of 68

Share Link: