AD7142 Analog Devices, AD7142 Datasheet - Page 6

• 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

AD7142
SPI TIMING SPECIFICATIONS (AD7142)
T
compliance. All input signals are specified with t
Table 4. SPI Timing Specifications
Parameter
f
t
t
t
t
t
t
t
t
SCLK
1
2
3
4
5
6
7
8
A
= −40°C to +85°C; V
SCLK
SDO
SDI
CS
Limit at T
5
5
20
20
15
15
20
16
15
DRIVE
t
1
= 1.65 V to 3.6 V; AV
MIN
t
4
MSB
, T
t
t
1
2
5
MAX
2
t
3
R
= t
CC
3
Figure 3. SPI Detailed Timing Diagram
, DV
F
= 5 ns (10% to 90% of V
Unit
MHz max
ns min
ns min
ns min
ns min
ns min
ns max
ns max
ns min
CC
= 2.6 V to 3.6 V, unless otherwise noted. Sample tested at 25°C to ensure
Rev. A | Page 6 of 72
15
Description
CS falling edge to first SCLK falling edge
SCLK high pulse width
SCLK low pulse width
SDI setup time
SDI hold time
SDO access time after SCLK falling edge
CS rising edge to SDO high impedance
SCLK rising edge to CS high
CC
LSB
16
) and timed from a voltage level of 1.6 V.
MSB
1
t
6
2
15
LSB
t
16
8
t
7