AD7148 Analog Devices, AD7148 Datasheet - Page 3

• Manufacturer Part Number: AD7148
• Manufacturer: Analog Devices

Specifications of AD7148

• Resolution (bits): 16bit
• # Chan: 8
• Sample Rate: 250kSPS
• Interface: I²C/Ser 2-Wire,Ser
• Analog Input Type: SE-Uni
• Ain Range: ± 8 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
AC
CC
Update Rate
Resolution
CINx Input Range
No Missing Codes
Total Unadjusted Error
Output Noise (Peak-to-Peak)
Output Noise (RMS)
C
C
Low Power Mode Delay Accuracy
Frequency
Output Voltage
Short-Circuit Source Current
Short-Circuit Sink Current
Maximum Output Load
Input High Voltage, V
Input Low Voltage, V
Input High Voltage, I
Input Low Voltage, I
Hysteresis
Output Low Voltage, V
Output High Leakage Current, I
V
V
I
CC
STRAY
STRAY
CC
DRIVE
SHIELD
= 2.6 V to 3.6 V, T
Offset Range
Offset Resolution
IL
A
IH
IL
IH
= −40
OL
o
C to +85°C, unless otherwise noted.
OH
Min
24.25
16
0
0.7 × V
−1
2.6
1.65
DRIVE
Typ
25
16
±8
7
3
0.8
0.5
±20
0.32
250
10
10
150
+0.1
3.3
0.9
15.5
2.3
Rev. A | Page 3 of 56
Max
25.75
±20
4
V
150
0.4
1
0.4
±1
3.6
3.6
1
21.5
7.5
CC
Unit
ms
Bits
pF
Bits
%
Codes
Codes
Codes
Codes
pF
pF
%
kHz
V
mA
mA
pF
V
V
μA
μA
mV
V
μA
V
V
mA
μA
μA
Test Conditions/Comments
8 conversion stages in sequencer;
decimation rate = 256
Guaranteed by design, not production tested
Decimation rate = 128
Decimation rate = 256
Decimation rate = 128
Decimation rate = 256
6-bit DAC
% of 200 ms, 400 ms, 600 ms, or 800 ms
Oscillating
Capacitance load on AC
V
V
I
V
Serial interface operating voltage
In full power mode, V
Low power mode, converter idle, V
Full shutdown, V
SINK
IN
IN
OUT
= V
= GND
= −1 mA
= V
DRIVE
DRIVE
CC
+ V
DRIVE
CC
+ V
SHIELD
DRIVE
to ground
CC
AD7148
+ V
DRIVE