AD7745ARUZ Analog Devices Inc, AD7745ARUZ Datasheet - Page 16

• Manufacturer Part Number: AD7745ARUZ
• Description: IC CONV 1CH CAP TO DGTL 16TSSOP
• Manufacturer: Analog Devices Inc
• Type: Capacitance-to-Digital Converterr

Specifications of AD7745ARUZ

• Design Resources: Extending the Capacitive Input Range of AD7745/AD7746 (CN0129)
• Resolution (bits): 24 b
• Data Interface: Serial
• 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
• Supply Current: 750µA
• Power Dissipation Pd: 4.25mW
• Inl ±: 100ppm
• Sample Rate: 90SPS
• Supply Voltage Max: 5.25V
• Input Channels Per Adc: 1
• No. Of Bits: 24 Bit
• Features: 24Bit Capacitance To Digital Convert I.C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Sampling Rate (per Second): -
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant

AD7745/AD7746
CAP SET-UP REGISTER
Address Pointer 0x07, Default Value 0x00
Capacitive channel setup.
Table 11. CAP Set-Up Register Bit Map
Bit
Mnemonic
Default
Table 12.
Bit
7
6
5
4-1
0
VT SET-UP REGISTER
Address Pointer 0x08, Default Value 0x00
Voltage/Temperature channel setup.
Table 13. VT Set-Up Register Bit Map
Bit
Mnemonic
Default
Table 14.
Bit
7
6
5
4
3-2
1
0
Mnemonic
CAPEN
CIN2
CAPDIFF
-
CAPCHOP
Mnemonic
VTEN
VTMD1
VTMD0
EXTREF
-
VTSHORT
VTCHOP = 1
Bit 7
CAPEN
0
Description
CAPEN = 1 enables capacitive channel for single conversion, continuous conversion, or calibration.
CIN2 = 1 switches the internal multiplexer to the second capacitive input on the AD7746.
DIFF = 1 sets differential mode on the selected capacitive input.
These bits must be 0 for proper operation.
The CAPCHOP bit should be set to 0 for the specified capacitive channel performance.
CAPCHOP = 1 approximately doubles the capacitive channel conversion times and slightly improves the
capacitive channel noise performance for the longest conversion times.
Bit 7
Description
VTEN = 1 enables voltage/temperature channel for single conversion, continuous conversion, or calibration.
Voltage/temperature channel input configuration.
VTMD1
0
0
1
1
EXTREF = 1 selects an external reference voltage connected to REFIN(+), REFIN(–) for the voltage input or the
V
EXTREF = 0 selects the on-chip internal reference. The internal reference must be used with the internal
temperature sensor for proper operation.
These bits must be 0 for proper operation.
VTSHORT = 1 internally shorts the voltage/temperature channel input for test purposes.
VTCHOP = 1 sets internal chopping on the voltage/temperature channel.
The VTCHOP bit must be set to 1 for the specified voltage/temperature channel performance.
VTEN
0
DD
monitor.
VTMD0
0
1
0
1
Bit 6
CIN2
0
Bit 6
VTMD1
0
Channel Input
Internal temperature sensor
External temperature sensor diode
V
External voltage input (VIN)
DD
monitor
Bit 5
CAPDIFF
0
Bit 5
VTMD0
0
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Bit 4
-
0
Bit 4
EXTREF
0
Bit 3
-
0
Bit 3
-
0
Bit 2
-
0
Bit 2
-
0
Bit 1
-
0
Bit 1
VTSHORT
0
Bit 0
CAPCHOP
0
Bit 0
VTCHOP
0