AD420AR-32-REEL Analog Devices Inc, AD420AR-32-REEL Datasheet - Page 13

• Manufacturer Part Number: AD420AR-32-REEL
• Description: IC,D/A CONVERTER,SINGLE,16-BIT,BICMOS,SOP,24PIN
• Manufacturer: Analog Devices Inc

Specifications of AD420AR-32-REEL

• Rohs Status: RoHS non-compliant
• Settling Time: 2.5µs
• Number Of Bits: 16
• Data Interface: Serial
• Number Of Converters: 1
• Voltage Supply Source: Single Supply
• Power Dissipation (max): 176mW
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 24-SOIC (7.5mm Width)

EXTERNAL BOOST FUNCTION
The external boost transistor reduces the power dissipated in
the AD420 by reducing the current flowing in the on-chip
output transistor (dividing it by the current gain of the external
circuit). A discrete NPN transistor with a breakdown voltage,
BV
The external boost capability has been developed for those
users who may wish to use the AD420, in the SOIC package, at
the extremes of the supply voltage, load current, and
temperature range. The PDIP package (because of its lower
thermal resistance) will operate safely over the entire specified
voltage, temperature, and load current ranges without the boost
CEO
, greater than 32 V can be used as shown in Figure 13.
AD420
Figure 13. External Boost Configuration
BOOST
I
OUT
0.022µF
19
18
1kΩ
MJD31C
2N3053
OR
R
LOAD
Rev. H | Page 13 of 16
transistor. The plot in Figure 14 shows the safe operating region
for both package types. The boost transistor can also be used to
reduce the amount of temperature induced drift in the part.
This will minimize the temperature induced drift of the on-chip
voltage reference, which improves drift and linearity.
32V
28V
20V
12V
4V
V
–60
CC
–40
AD420 OR AD420-32
–20
Figure 14. Safe Operating Region
TEMPERATURE (°C)
0
20
WHEN USING SOIC PACKAGED DEVICES,
AN EXTERNAL BOOST TRANSISTOR IS
REQUIRED FOR OPERATION IN THIS AREA.
40
60
80
25V
100
AD420