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ADR370BRT-R2 Folha de dados(PDF) 7 Page - Analog Devices

Nome de Peças ADR370BRT-R2
Descrição Electrónicos  Precision Low Power 2.048 V SOT-23 Voltage Reference
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Fabricante Electrônico  AD [Analog Devices]
Página de início  http://www.analog.com
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ADR370BRT-R2 Folha de dados(HTML) 7 Page - Analog Devices

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REV. A
ADR370
–7–
APPLICATIONS
Low Cost Negative Reference
A low cost negative reference can be obtained by leveraging the
current sinking capability of the ADR370. Simply tying the VOUT
terminal to ground and adding a bias resistor, RSET, to the GND
pin of the device, a negative voltage reference can be obtained
as shown in Figure 3. RSET should be chosen such that ISET
remains between 1 mA to 5 mA.
VIN
VDD
VSS
RSET
ISET
ADR370
VOUT
GND
–VREF
Figure 3. Low Cost Negative Reference
Precision Negative Reference
Without using any matching resistors, a precision negative reference
can be obtained using the configuration shown in Figure 4. The
voltage difference between VOUT and GND of the ADR370 is
2.048 V. Since VOUT is at virtual ground, U2 will close the loop by
forcing the GND pin to be the negative reference node. U2 should
be a low offset voltage precision op amp, such as the OP1177.
VIN
+15V
U2
U1
2.3V TO 12V
OP1177
–15V
ADR370
VOUT
GND
–VREF
Figure 4. Precision Negative Reference
Low Cost Current Source
Figure 5 illustrates how a simple, low cost current source can be
configured using the ADR370. The load current, IL, is simply
the sum of ISET and the quiescent current, Iq. ISET is simply the
reference voltage generated by the ADR370 divided by RSET.
I
V
R
SET
SET
=
2 048
.
(4)
The quiescent current, Iq, varies slightly with load. The variation
in Iq limits the use of this circuit to general-purpose applications.
VIN
VL + 2.5V < VDD < VL + 12V
ADR370
VOUT
GND
ISET =
RSET
RSET
VL
RL
IL
Iq = 65 A
2.048V
Figure 5. Low Cost Current Source
Precision Current Source with Adjustable Output
A precision current source can be implemented with the circuit
shown in Figure 6. By adding a mechanical or digital potenti-
ometer, this circuit becomes an adjustable current source. If a
digital potentiometer like the AD5201 is used, the load current
is simply the voltage across terminals B-to-W of the digital
potentiometer divided by RSET.
I
VD
R
L
REF
SET
=
×
× 256
(5)
where D is the decimal equivalent of the digital potentiometer
input code.
VIN
+12V
A
B
W
–2.048V TO VL
0V TO (2.048V + VL)
12V
OP1177
AD5201
–12V
ADR370
VOUT
GND
VL
RL
RSET
IL
Figure 6. Programmable 0 mA to 5 mA Current Source
To optimize the resolution of this circuit, dual supply op amps
should be used because the ground potential of ADR370 can
swing from –2.048 V at zero scale to VL at full scale of the
potentiometer setting.


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