AD7156BCPZ-REEL7 Analog Devices Inc, AD7156BCPZ-REEL7 Datasheet - Page 14

• Manufacturer Part Number: AD7156BCPZ-REEL7
• Description: IC CDC 2CH 12BIT 1.8V 10LFCSP
• Manufacturer: Analog Devices Inc
• Type: Capacitance-to-Digital Converterr

Specifications of AD7156BCPZ-REEL7

• Resolution (bits): 12 b
• Data Interface: Serial
• Sampling Rate (per Second): 100k
• Voltage Supply Source: Single Supply
• Voltage - Supply: 1.8 V ~ 3.6 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 10-LFCSP
• Sampling Rate: 100SPS
• Input Channel Type: Single Ended
• Supply Voltage Range - Analog: 1.8V To 3.6V
• Supply Current: 70µA
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant
• Other names: AD7156BCPZ-REEL7TR

AD7156
AUTO-DAC ADJUSTMENT
In adaptive threshold mode, the part can dynamically adjust the
CAPDAC to keep the CDC in an optimal operating capacitive
range. When the auto-DAC function is enabled, the CAPDAC
value is automatically incremented when the data average
exceeds ¾ of the CDC full range (average > 0xA800), and
the CAPDAC value is decremented when the data average
goes below ¼ of the CDC full range (average < 0x5800).
The auto-DAC increment or decrement step depends on
the selected CDC capacitive input range (see the Setup Registers
section).
When the CAPDAC value reaches 0, the ¼ threshold for further
decrementing is ignored. Similarly, when the CAPDAC value
reaches its full range, the ¾ threshold is ignored. The CDC and
the rest of the algorithm are continuously working, and they are
functional down to a capacitance input of 0 pF or as high as the
capacitance input of (CAPDAC full range + CDC full range),
respectively.
Rev. 0 | Page 14 of 28
POWER-DOWN TIMER
In power sensitive applications, the AD7156 can be set to
automatically enter power-down mode after a programmed
period of time in which the outputs have not been activated.
The AD7156 can then be returned to a normal operational
mode either via the serial interface or by the power supply
off/on sequence.