AD7746ARUZ Analog Devices Inc, AD7746ARUZ Datasheet - Page 18

• Manufacturer Part Number: AD7746ARUZ
• Description: IC CONV 2CH CAP TO DGTL 16-TSSOP
• Manufacturer: Analog Devices Inc
• Type: Capacitance-to-Digital Converterr

Specifications of AD7746ARUZ

• Resolution (bits): 24 b
• Data Interface: Serial
• Design Resources: Extending the Capacitive Input Range of AD7745/AD7746 (CN0129)
• Voltage Supply Source: Single Supply
• Voltage - Supply: 2.7 V ~ 5.25 V
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: 16-TSSOP
• Sampling Rate: 90SPS
• Input Channel Type: Differential, Single Ended
• Supply Current: 750µA
• Digital Ic Case Style: TSSOP
• No. Of Pins: 16
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With: EVAL-AD7746EBZ - BOARD EVALUATION FOR AD7746
• Sampling Rate (per Second): -
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant

AD7745/AD7746
CONFIGURATION REGISTER
Address Pointer 0x0A, Default Value 0xA0
Converter update rate and mode of operation setup.
Table 17. Configuration Register Bit Map
Bit
Mnemonic
Default
Table 18.
Bit
7
6
5
4
3
2
1
0
Mnemonic
VTF1
VTF0
CAPF2
CAPF1
CAPF0
MD2
MD1
MD0
Description
Voltage/temperature channel digital filter setup—conversion time/update rate setup.
The conversion times in this table are valid for the CLKCTRL = 0 in the EXC SETUP register. The conversion
times are longer by a factor of two for the CLKCTRL = 1.
VTF1
0
0
1
1
Capacitive channel digital filter setup—conversion time/update rate setup.
The conversion times in this table are valid for the CLKCTRL = 0 in the EXC SETUP register.
The conversion times are longer by factor of two for the CLKCTRL = 1.
CAPF2
0
0
0
0
1
1
1
1
Converter mode of operation setup.
MD2
0
0
0
0
1
1
1
1
Bit 7
VTF1
0
CAPF1
0
0
1
1
0
0
1
1
MD1
0
0
1
1
0
0
1
1
Bit 6
VTF0
0
VTF0
0
1
0
1
CAPF0
0
1
0
1
0
1
0
1
MD0
0
1
0
1
0
1
0
1
Bit 5
CAPF2
0
Rev. 0 | Page 18 of 28
Conversion Time (ms)
20.1
32.1
62.1
122.1
Conversion Time (ms)
11.0
11.9
20.0
38.0
62.0
77.0
92.0
109.6
Mode
Idle
Continuous conversion
Single conversion
Power-Down
-
Capacitance system offset calibration
Capacitance or voltage system gain calibration
Bit 4
CAPF1
0
Bit 3
CAPF0
0
Update Rate (Hz)
49.8
31.2
16.1
8.2
Update Rate
90.9
83.8
50.0
26.3
16.1
13.0
10.9
9.1
CAP CHOP = 0
VTCHOP = 1
Bit 2
MD2
0
–3 dB Frequency (Hz)
26.4
15.9
8.0
4.0
–3 dB Frequency (Hz)
87.2
79.0
43.6
21.8
13.1
10.5
8.9
8.0
Bit 1
MD1
0
Bit 0
MD0
0