AD7147A
Rev. B | Page 3 of 68
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
8.73
9
9.27
ms
12 conversion stages, decimation = 64
17.46
18
18.54
ms
12 conversion stages, decimation = 128
34.9
36
37.1
ms
12 conversion stages, decimation = 256
Resolution
16
Bits
CINx Input Range
±8
pF
No Missing Codes
16
Bits
Guaranteed by design, but not production tested
CINx Input Leakage
25
nA
Maximum Output Load
20
pF
Capacitance load on CINx to ground
Total Unadjusted Error
±20
%
Output Noise (Peak-to-Peak)
12
Codes
Decimation rate = 64
7
Codes
Decimation rate = 128
3
Codes
Decimation rate = 256
Output Noise (RMS)
1.1
Codes
Decimation rate = 64
0.8
Codes
Decimation rate = 128
0.5
Codes
Decimation rate = 256
CSTRAY Offset Range
20
pF
CSTRAY Offset Resolution
0.32
pF
Low Power Mode Delay Accuracy
4
%
Percentage of 200 ms, 400 ms, 600 ms, or 800 ms
ACSHIELD
Frequency
250
kHz
Output Voltage
0
VCC
V
Oscillating
Short-Circuit Source Current
10
mA
Short-Circuit Sink Current
10
mA
Maximum Output Load
150
pF
Capacitance load on ACSHIELD to ground
LOGIC INPUTS (SDI, SCLK, CS, SDA, GPIO)
Input High Voltage, VIH
0.7 × VDRIVE
V
Input Low Voltage, VIL
0.4
V
Input High Current, IIH
1
μA
VIN = VDRIVE
Input Low Current, IIL
1
μA
VIN = GND
Hysteresis
150
mV
OPEN-DRAIN OUTPUTS (SCLK, SDA, INT)
Output Low Voltage, VOL
0.4
V
ISINK = 1 mA
Output High Leakage Current, IOH
±0.1
±1
μA
VOUT = VDRIVE
LOGIC OUTPUTS (SDO, GPIO)
Output Low Voltage, VOL
0.4
V
ISINK = 1 mA, VDRIVE = 1.65 V to 3.6 V
Output High Voltage, VOH
VDRIVE 0.6
V
ISOURCE = 1 mA, VDRIVE = 1.65 V to 3.6 V
GPO, SDO Floating State Leakage
Current
±1
μA
Pin three-state, leakage measured to GND and VCC
POWER
VCC
2.6
3.3
3.6
V
VDRIVE
1.65
3.6
V
Serial interface operating voltage
ICC
0.8
1
mA
In full power mode, VCC + VDRIVE, Register 0x00, Bits[15:14] = 00
1.1
1.3
mA
In full power mode, VCC + VDRIVE, Register 0x00, Bits[15:14] = 01
1.2
1.5
mA
In full power mode, VCC + VDRIVE, Register 0x00, Bits[15:14] = 10
1.6
1.8
mA
In full power mode, VCC + VDRIVE, Register 0x00, Bits[15:14] = 11
15.5
24
μA
Low power mode, converter idle, VCC + VDRIVE, decimation = 256;
Register 0x00, Bits[15:14] = 01
2.3
10
μA
Full shutdown, VCC + VDRIVE, Register 0x00, Bits[15:14] = 01