AD7715 Analog Devices, AD7715 Datasheet - Page 25

• Manufacturer Part Number: AD7715
• Manufacturer: Analog Devices

Specifications of AD7715

• Resolution (bits): 16bit
• # Chan: 1
• Sample Rate: 19.2kSPS
• Interface: Ser,SPI
• Analog Input Type: Diff-Bip,Diff-Uni
• Ain Range: (Vref/PGA Gain) p-p,Uni (Vref)/(PGA Gain)
• Adc Architecture: Sigma-Delta
• Pkg Type: DIP,SOIC,SOP

If the part is used in unipolar mode with a required span of
0.8 × V
calibration can handle is from −1.05 × V
V
span of V
calibration can handle is from −1.05 × V
V
required to remove an offset of 0.2 × V
range which the system calibration can handle is 0.85 ×
V
If the part is used in bipolar mode with a required span of ±0.4 ×
V
can handle is from −0.65 × V
the part is used in bipolar mode with a required span of ±V
GAIN, then the offset range which the system calibration can
handle is from −0.05 × V
Similarly, if the part is used in bipolar mode and required to
remove an offset of ±0.2 × V
which the system calibration can handle is ±0.85 × V
REF
REF
REF
REF
/GAIN. If the part is used in unipolar mode with a required
/GAIN. Similarly, if the part is used in unipolar mode and
/GAIN.
/GAIN, then the offset range which the system calibration
REF
REF
/GAIN, then the offset range which the system
/GAIN, then the offset range which the system
REF
/GAIN to +0.05 × V
REF
REF
/GAIN, then the span range
/GAIN to +0.65 × V
REF
REF
REF
/GAIN, then the span
/GAIN to +0.25 ×
/GAIN to +0.05 ×
REF
/GAIN.
REF
REF
/GAIN. If
/GAIN.
REF
Rev. D | Page 25 of 40
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Power-Up and Calibration
On power-up, the AD7715 performs an internal reset that sets
the contents of the internal registers to a known state. There are
default values loaded to all registers after a power-on or reset.
The default values contain nominal calibration coefficients for
the calibration registers. However, to ensure correct calibration
for the device a calibration routine should be performed after
power-up.
The power dissipation and temperature drift of the AD7715
are low, and no warm-up time is required before the initial
calibration is performed. However, if an external reference is
being used, this reference must have stabilized before calibration is
initiated. Similarly, if the clock source for the part is generated
from a crystal or resonator across the MCLK pins, the start-up
time for the oscillator circuit should elapse before a calibration
is initiated on the part (see the Clocking and Oscillator Circuit
section).
AD7715