AD7765 Analog Devices, AD7765 Datasheet - Page 29
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AD7765
Manufacturer Part Number
AD7765
Description
24-Bit, 156 kSPS, 112 dB Sigma-Delta ADC with On-Chip Buffers and Serial Interface
Manufacturer
Analog Devices
Datasheet
1.AD7765.pdf
(32 pages)
Specifications of AD7765
Resolution (bits)
24bit
# Chan
1
Sample Rate
40MSPS
Interface
Ser,SPI
Analog Input Type
Diff-Uni
Ain Range
6.5 V p-p
Adc Architecture
Sigma-Delta
Pkg Type
SOP
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GAIN REGISTER—ADDRESS 0x0004
Non-Bit-Mapped, Default Value 0xA000
The gain register is scaled such that 0x8000 corresponds to a
gain of 1.0. The default value of this register is 1.25 (0xA000).
This results in a full-scale digital output when the input is at
80% of V
of ±80% of V
REF
+, tying in with the maximum analog input range
REF
+ p-p.
Rev. A | Page 29 of 32
OVERRANGE REGISTER—ADDRESS 0x0005
Non-Bit-Mapped, Default Value 0xCCCC
The overrange register value is compared with the output of the
first decimation filter to obtain an overload indication with
minimum propagation delay. This is prior to any gain scaling or
offset adjustment. The default value is 0xCCCC, which corre-
sponds to 80% of V
voltage). Assuming V
input voltage exceeds approximately 6.55 V p-p differential. The
overrange bit is set immediately if the analog input voltage
exceeds 100% of V
at the modulator rate.
REF
REF
+ for more than four consecutive samples
REF
+ (the maximum permitted analog input
+ = 4.096 V, the bit is then set when the
AD7765