EVAL-AD7841EB Analog Devices Inc, EVAL-AD7841EB Datasheet - Page 12
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EVAL-AD7841EB
Manufacturer Part Number
EVAL-AD7841EB
Description
BOARD EVAL FOR AD7841
Manufacturer
Analog Devices Inc
Datasheet
1.EVAL-AD7841EB.pdf
(12 pages)
Specifications of EVAL-AD7841EB
Number Of Dac's
8
Number Of Bits
14
Outputs And Type
8, Single Ended
Sampling Rate (per Second)
32k
Data Interface
Parallel
Settling Time
31µs
Dac Type
Voltage
Voltage Supply Source
Analog and Digital, Dual ±
Operating Temperature
-40°C ~ 85°C
Utilized Ic / Part
AD7841
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
AD7841
The AD8803 has an output voltage range of GND to V
to 5 V). To trim the V
on the AD8803 DAC can be set using the V
allowing 8 bits of resolution between the two points. This will
allow the V
To trim the V
voltage in the required negative voltage range is required. Neither
the AD7804 or the AD8803 can provide this range in normal
operation as their output range is 0 V to 5 V. There are two
methods of producing this negative voltage. One method is to
REF
REF
(+) pin to be adjusted to remove gain errors.
(–) voltage, some method of providing a trim
CONTROLLER
ADDR BUS
DATA BUS
REF
SDATA
(+) input, the appropriate trim range
SCLK
LOGIC LEVEL
SHIFT
DECODER
ADDR
0.037 (0.94)
0.025 (0.64)
0.040 (1.02)
0.032 (0.81)
SEATING
REFL
ADDITIONAL PINS OMITTED FOR CLARITY
PLANE
FSIN/CS
FSIN/CS
and V
0.096 (2.44)
0.083 (2.11)
0.077 (1.96)
SCLK
SCLK
D IN
D IN
Dimensions shown in inches and (mm).
MAX
OUTLINE DIMENSIONS
REFH
44-Lead MQFP (S-44)
DD
8/10-BIT
8/10-BIT
DAC
DAC
0.8°
0.040 (1.02)
0.032 (0.81)
8°
(0 V
pins
GND
GND
+5V
V
V
5V
DD
DD
34
44
provide a positive output voltage and then to level shift that ana-
log voltage to the required negative range. Alternatively these
DACs can be operated with supplies of 0 V and –5 V, with the
V
Now these can be used to provide the negative reference volt-
ages for the V
signals driving the DACs need to be level-shifted from the 0 V
to +5 V range to the –5 V to 0 V range. Figure 13 shows a
typical application circuit to provide programmable reference
capabilities for the AD7841.
33
1
DD
0.033 (0.84)
0.029 (0.74)
pin connected to 0 V and the GND pin connected to –5 V.
0.548 (13.925)
0.546 (13.875)
0.398 (10.11)
0.390 (9.91)
(PINS DOWN)
TOP VIEW
0V TO
0V TO +5V
0.016 (0.41)
0.012 (0.30)
REF
5V
(–) inputs on the AD7841. However, the digital
23
11
V
V
DATA BUS
REF
REF
22
12
( )AB
(+)AB
AD7841
A0, A1, A2
GND
V
V
OUT
OUT
A
B
V
V
OUT
OUT
A
B