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AD5543BRM 데이터시트(PDF) 9 Page - Analog Devices

부품명 AD5543BRM
상세설명  Current Output/ Serial Input, 16-/14-Bit DAC
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제조업체  AD [Analog Devices]
홈페이지  http://www.analog.com
Logo AD - Analog Devices

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REV. A
AD5543/AD5553
–9–
Programmable Current Source
Figure 10 shows a versatile V-I conversion circuit using an
improved Howland Current Pump. In addition to the precision
current conversion it provides, this circuit enables a bidirec-
tional current flow and high voltage compliance. This circuit
can be used in 4 to 20 mA current transmitters with up to 500
of load. In Figure 10, it can be shown that if the resistor network is
matched, the load current is:
I
RR
R
R
VD
L
REF
=
+
()
××
23
1
3
/
(5)
R3 in theory can be made small to achieve the current needed
within the U3 output current driving capability. This circuit is
versatile such that AD8510 can deliver
±20 mA in both direc-
tions and the voltage compliance approaches 15 V, which is
limited mainly by the supply voltages of U3. However, users
must pay attention to the compensation. Without C1, it can be
shown that the output impedance becomes:
Z
RR R
R
RR
R
R
R
R
O =
+
()
+
()
+
()
13
1
2
12
3
1
2
3
'
'' –
'
(6)
If the resistors are perfectly matched, ZO is infinite, which is
desirable, and behaves as an ideal current source. On the other
hand, if they are not matched, ZO can be either positive or nega-
tive. Negative can cause oscillation. As a result, C1 is needed to
prevent the oscillation. For critical applications, C1 could be
found empirically, but typically falls in the range of few pF.
VREF
VDD
U2
U1
AD5543/AD5553
VL
GND
IOUT
RFB
AD8628
AD8510
V+
V–
VREF
LOAD
U3
VDD
VSS
R3
50
IL
VDD
C1
10pF
R3'
50
R2
15k
R1
150k
R2'
15k
R1'
150k
Figure 10. Programmable Current Source with Bidirec-
tional Current Control and High Voltage Compliance
Capabilities


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