AD7142 Analog Devices, AD7142 Datasheet - Page 7

• Manufacturer Part Number: AD7142
• Description: Programmable Controller for Capacitance Touch Sensors
• Manufacturer: Analog Devices

Specifications of AD7142

• Resolution (bits): 16bit
• # Chan: 14
• Sample Rate: 250kSPS
• Interface: I²C/Ser 2-Wire,Ser,SPI
• Analog Input Type: Diff-Uni
• Ain Range: ± 2 pF (Delta C)
• Adc Architecture: Sigma-Delta
• Pkg Type: CSP

I
T
compliance. All input signals timed from a voltage level of 1.6 V.
Table 5. I
Parameter
f
t
t
t
t
t
t
t
t
t
t
1
SCLK
2
1
2
3
4
5
6
7
8
R
F
Guaranteed by design, not production tested.
A
C TIMING SPECIFICATIONS (AD7142-1)
= −40°C to +85°C; V
2
SDATA
C Timing Specifications
SCLK
STOP START
Limit
400
0.6
1.3
0.6
100
300
0.6
0.6
1.3
300
300
t
8
DRIVE
= 1.65 V to 3.6 V; AV
t
1
t
1
2
t
5
t
R
Unit
kHz max
μs min
μs min
μs min
ns min
ns min
μs min
μs min
μs min
ns max
ns max
CC
, DV
Figure 4. I
t
F
CC
t
3
= 2.6 V to 3.6 V, unless otherwise noted. Sample tested at 25°C to ensure
Rev. A | Page 7 of 72
2
C Detailed Timing Diagram
t
4
Description
Start condition hold time, t
Clock low period, t
Clock high period, t
Data setup time, t
Data hold time, t
Stop condition setup time, t
Start condition setup time, t
Bus free time between stop and start conditions, t
Clock/data rise time
Clock/data fall time
START
HD; DAT
SU; DAT
t
7
LOW
HIGH
t
1
HD; STA
SU; STO
SU; STA
t
6
BUF
STOP
AD7142