AD7225LP Analog Devices Inc, AD7225LP Datasheet - Page 20
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AD7225LP
Manufacturer Part Number
AD7225LP
Description
IC DAC 8BIT QUAD W/AMP 28-PLCC
Manufacturer
Analog Devices Inc
Datasheet
1.AD7225CRSZ.pdf
(24 pages)
Specifications of AD7225LP
Rohs Status
RoHS non-compliant
Settling Time
4µs
Number Of Bits
8
Number Of Converters
4
Voltage Supply Source
Dual ±
Power Dissipation (max)
500mW
Operating Temperature
-40°C ~ 85°C
Mounting Type
Surface Mount
Package / Case
28-LCC (J-Lead)
Data Interface
-
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AD7225
V
Operating the AD7225 from dual supplies results in enhanced
performance over single-supply operation on a number of
parameters as previously outlined. Some applications may
require this enhanced performance, but may only have a single
power supply rail available. The circuit of Figure 29 shows a
method of generating a negative voltage using one CD4049,
operated from a V
chip are used as an oscillator. The other four inverters are in
parallel and used as buffers for higher output current. The
square wave output is level translated to a negative-going signal,
then rectified and filtered. The circuit configuration shown
provides an output voltage of −5.1 V for current loadings in the
range of 0.5 mA to 9 mA. This satisfies the AD7225 I
ment over the commercial operating temperature range.
SS
GENERATION
DD
of 15 V. Two inverters of the hex inverter
SS
require-
Rev. C | Page 20 of 24
CD4049AE
510kΩ
1/6
5.1kΩ
CD4049AE
0.02µF
1/6
Figure 29. V
CD4049AE
CD4049AE
CD4049AE
CD4049AE
1/6
1/6
1/6
1/6
SS
Generation Circuit
1N4001
47µF
+
1N4001
+
510Ω
47µF
5V1
–V
OUT