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AD420 Datasheet(PDF) 7 Page - Analog Devices

Part No. AD420
Description  Serial Input 16-Bit 4 mA-20 mA, 0 mA-20 mA DAC
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Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

AD420 Datasheet(HTML) 7 Page - Analog Devices

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REV. F
–7–
AD420
APPLICATIONS
CURRENT OUTPUT
The AD420 can provide 4 mA–20 mA, 0 mA–20 mA, or 0 mA–
24 mA output without any active external components. Filter
capacitors C1 and C2 can be any type of low cost ceramic ca-
pacitors. To meet the specified full-scale settling time of 3 ms,
low dielectric absorption capacitors (NPO) are required. Suit-
able values are C1 = 0.01
µF and C2 = 0.01 µF.
5
2
4
6
7
8
9
C1
C2
VCC
20
21
23
VLL
IOUT (4mA–20mA)
RLOAD
REF
OUT
REF
IN
15
14
11
GND
RANGE
SELECT 1
RANGE
SELECT 2
CLEAR
LATCH
CLOCK
DATA IN
AD420
18
0.1 F
0.1 F
Figure 5. Standard Configuration
DRIVING INDUCTIVE LOADS
When driving inductive or poorly defined loads connect a
0.01
µF capacitor between I
OUT (Pin 18) and GND (Pin 11).
This will ensure stability of the AD420 with loads beyond
50 mH. There is no maximum capacitance limit. The capacitive
component of the load may cause slower settling, though this
may be masked by the settling time of the AD420. A pro-
grammed change in the current may cause a back EMF voltage
on the output that may exceed the compliance of the AD420.
To prevent this voltage from exceeding the supply rails connect
protective diodes between IOUT and each of VCC and GND.
VOLTAGE-MODE OUTPUT
Since the AD420 is a single supply device, it is necessary to add
an external buffer amplifier to the VOUT pin to obtain a selec-
tion of bipolar output voltage ranges as shown in Figure 6.
6
7
8
9
C1
C2
VCC
20
21
23
VOUT
R2
REF
OUT
REF
IN
15
14
11
GND
RANGE
SELECT 1
RANGE
SELECT 2
CLEAR
LATCH
CLOCK
DATA IN
AD420
17
4
5
R1
R3
VOUT
0.1 F
0.1 F
2
VLL
Figure 6.
Table IV. Buffer Amplifier Configuration
R1
R2
R3
VOUT
Open
Open
0
0 V–5 V
Open
R
R
0 V–10 V
R
Open
R
±5 V
R2R
2R
±10 V
Suitable R = 5 k
Ω.
OPTIONAL SPAN AND ZERO TRIM
For those users who would like lower than specified values of
offset and gain error, Figure 7 shows a simple way to trim these
parameters. Care should be taken to select low drift resistors
because they will affect the temperature drift performance of the
DAC.
The adjustment algorithm is iterative. The procedure for trim-
ming the AD420 in the 4 mA–20 mA mode can be accom-
plished as follows:
STEP I . . . OFFSET ADJUST
Load all zeros. Adjust RZERO for 4.00000 mA of output
current.
STEP II . . . GAIN ADJUST
Load all ones. Adjust RSPAN for 19.99976 mA (FS – 1 LSB) of
output current.
Return to STEP I and iterate until convergence is obtained.
6
7
8
9
C1
C2
VCC
20
21
500
RSPAN
15
11
GND
RANGE
SELECT1
RANGE
SELECT2
CLEAR
LATCH
CLOCK
DATA IN
AD420
19
4
2
VLL
IOUT (4mA–20mA)
RLOAD
18
5k
RSPAN2
VREF
14
23
16
10k
RZERO
5
BOOST
0.1 F
0.1 F
Figure 7. Offset and Gain Adjust
Variation of RZERO between REF OUT (5 V) and GND leads
to an offset adjust range from –1.5 mA to 6 mA, (1.5 mA/V
centered at 1 V).
The 5 k
Ω RSPAN2 resistor is connected in parallel with the
internal 40
Ω sense resistor, which leads to a gain increase of
+0.8%.
As RSPAN is changed to 500
Ω, the voltage on REF IN is
attenuated by the combination of RSPAN and the 30 k
REF IN input resistance. When added together with RSPAN2
this results in an adjustment range of –0.8% to +0.8%.


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