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AD7143ACPZ-1500RL7 Scheda tecnica(PDF) 3 Page - Analog Devices

Il numero della parte AD7143ACPZ-1500RL7
Spiegazioni elettronici  Programmable Controller for Capacitance Touch Sensors
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Produttore elettronici  AD [Analog Devices]
Homepage  http://www.analog.com
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AD7143
Rev. 0 | Page 3 of 56
SPECIFICATIONS
VCC = 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
23
25
26
ms
Eight 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
5
%
% of 200 ms, 400 ms, 600 ms, or 800 ms
EXCITATION SOURCE
Frequency
237.5
240
262.5
kHz
Output Voltage
VCC
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
VCC/2
V
LOGIC INPUTS (SCLK, SDA)
VIH Input High Voltage
0.7 × VDRIVE
V
VIL Input Low Voltage
0.4
V
IIH Input High Voltage
−1
μA
IIL Input Low Voltage
1
μA
VIN = GND
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
POWER
VCC
2.6
3.3
3.6
V
VDRIVE
1.65
3.6
V
ICC
0.9
1
mA
In full power mode
20
μA
Low power mode, converter idle, TA = 25°C
16
30
μA
Low power mode, converter idle
4.5
μA
Full shutdown, TA = 25°C
2.25
15
μA
Full shutdown
1 CIN and CBULK are defined as follows:
PLASTIC OVERLAY
SENSOR BOARD
CBULK
CIN
CAPACITIVE SENSOR


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