AD7225KP-REEL Analog Devices Inc, AD7225KP-REEL Datasheet - Page 20

• Manufacturer Part Number: AD7225KP-REEL
• Description: IC DAC 8BIT QUAD W/AMP 28-PLCC
• Manufacturer: Analog Devices Inc

Specifications of AD7225KP-REEL

• 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: -

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