AD7143 Analog Devices, AD7143 Datasheet - Page 3

• Manufacturer Part Number: AD7143
• Description: Programmable Controller for Capacitance Touch Sensors
• Manufacturer: Analog Devices

Specifications of AD7143

• Resolution (bits): 16bit
• # Chan: 8
• Sample Rate: n/a
• Interface: I²C/Ser 2-Wire,Ser
• Analog Input Type: n/a
• Ain Range: ± 2 pF (Delta C)
• Adc Architecture: Sigma-Delta
• Pkg Type: CSP

SPECIFICATIONS
V
Table 1.
Parameter
CAPACITANCE-TO-DIGITAL CONVERTER
EXCITATION SOURCE
LOGIC INPUTS (SCLK, SDA)
OPEN-DRAIN OUTPUTS (SCLK, SDA, INT)
POWER
1
C
PLASTIC OVERLAY
CC
IN
Update Rate
Resolution
CIN Input Range
No Missing Codes
CIN Input Leakage
Total Unadjusted Error
Output Noise (Peak-to-Peak)
Output Noise (RMS)
Parasitic Capacitance
C
C
Low Power Mode Delay Accuracy
Frequency
Output Voltage
Short-Circuit Source Current
Short-Circuit Sink Current
Maximum Output Load
C
C
V
V
I
I
Hysteresis
V
I
V
V
I
IH
IL
OH
CC
SENSOR BOARD
and C
BULK
BULK
SHIELD
SHIELD
IH
IL
OL
CC
DRIVE
= 2.6 V to 3.6 V, T
Input High Voltage
Input Low Voltage
Input High Voltage
Input Low Voltage
Output High Leakage Current
Output Low Voltage
CAPACITIVE SENSOR
Offset Range
Offset Resolution
BULK
Output Drive
Bias Level
are defined as follows:
1
1
A
= −40
o
C to +85°C, unless otherwise noted.
C
C
IN
BULK
Min
23
16
237.5
0.7 × V
−1
2.6
1.65
DRIVE
Typ
25
16
±2
25
7
3
0.8
0.5
±20
156.25
240
20
50
250
10
VCC/2
150
+0.1
3.3
0.9
16
2.25
Rev. 0 | Page 3 of 56
Max
26
±20
40
5
262.5
VCC
0.4
1
0.4
±1
3.6
3.6
1
20
30
4.5
15
Unit
ms
Bit
pF
Bit
nA
%
Codes
Codes
Codes
Codes
pF
pF
fF
%
kHz
V
mA
mA
pF
μA
V
V
V
μA
μA
mV
V
μA
V
V
mA
μA
μA
μA
μA
Test Conditions/Comments
Eight conversion stages in sequencer, decimation = 256
Guaranteed by design, but not production tested
Decimation rate = 128
Decimation rate = 256
Decimation rate = 128
Decimation rate = 256
Parasitic capacitance to ground, per CIN input guaranteed
by characterization
% of 200 ms, 400 ms, 600 ms, or 800 ms
Capacitance load on source to ground
V
I
In full power mode
Low power mode, converter idle, T
Low power mode, converter idle
Full shutdown, T
Full shutdown
SINK
IN
= GND
= −1 mA
A
= 25°C
A
= 25°C
AD7143