AD7265BCPZ-REEL Analog Devices Inc, AD7265BCPZ-REEL Datasheet - Page 18

• Manufacturer Part Number: AD7265BCPZ-REEL
• Description: IC,Data Acquisition System,3-CHANNEL,12-BIT,LLCC,32PIN,PLASTIC
• Manufacturer: Analog Devices Inc

Specifications of AD7265BCPZ-REEL

• Design Resources: AD7265 in Differential and Single-Ended Configurations Using AD8022 (CN0048)
• Number Of Bits: 12
• Sampling Rate (per Second): 1M
• Data Interface: DSP, MICROWIRE™, QSPI™, Serial, SPI™
• Number Of Converters: 2
• Power Dissipation (max): 21mW
• Voltage Supply Source: Analog and Digital
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: 32-VFQFN, CSP Exposed Pad
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With: EVAL-AD7265CB - BOARD EVALUATION FOR AD7265
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

AD7265
TRANSFER FUNCTIONS
The designed code transitions occur at successive integer LSB
values (1 LSB, 2 LSB, and so on). In single-ended mode, the LSB
size is V
size is 2 × V /4096 when the 0 V to 2 × V
differential mode, the LSB size is 2 × V
V
0 V to 2 × V
for the AD7265 when straight binary coding is output is shown
in
when twos complement coding is output is shown (with the 2 ×
V
REF
REF
Figure 32, and the ideal transfer characteristic for the AD7265
NOTE
1. V
range is used, and the LSB size is 4 × V
range) in Figure 33.
REF
011...111
011...110
000...001
000...000
111...111
100...010
100...001
100...000
111...111
111...110
111...000
011...111
000...010
000...001
000...000
REF
Figure 33. Twos Complement Transfer Characteristic with
IS EITHER V
/4096 when the 0 V to V
–V
REF
Figure 32. Straight Binary Transfer Characteristic
REF
REF
0V
range is used. The ideal transfer characteristic
1LSB
+ 1LSB V
1LSB = 2
REF
OR 2 × V
V
REF
REF
×
V
± V
REF
– 1LSB
REF
ANALOG INPUT
REF
/4096
.
ANALOG INPUT
Input Range
REF
1LSB = V
+V
REF
range is used, and the LSB
REF
V
REF
– 1 LSB
/4096 when the 0 V to
REF
REF
– 1LSB
REF
/4096
range is used. In
/4096 when the
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DIGITAL INPUTS
The digital inputs applied to the AD7265 are not limited by the
maximum ratings that limit the analog inputs. Instead, the
digital inputs can be applied up to 7 V and are not restricted by
the V
Maximum Ratings
advantage of the SCLK, RANGE, A0 to A2, and
being restricted by the V
sequencing issues are avoided. If one of these digital inputs is
applied before V
be on the analog inputs if a signal greater than 0.3 V were
applied prior to V
V
The AD7265 also has a V
which the serial interface operates. V
easily interface to both 3 V and 5 V processors. For example, if
the AD7265 was operated with a V
could be powered from a 3 V supply, allowing a large dynamic
range with low voltage digital processors. Therefore, the
AD7265 could be used with the 2 × V
of 5 V while still being able to interface to 3 V digital parts.
DRIVE
DD
+ 0.3 V limit, as are the analog inputs. See the
DD
DD
, there is no risk of latch-up, as there would
section for more information. Another
.
DD
DRIVE
+ 0.3 V limit is that power supply
feature to control the voltage at
DD
DRIVE
of 5 V, the V
REF
input range, with a V
allows the ADC to
CS pins not
DRIVE
Absolute
pin
DD