ADR01ARZ Analog Devices Inc, ADR01ARZ Datasheet - Page 16

• Manufacturer Part Number: ADR01ARZ
• Description: IC VREF PREC 10V 10PPM 8SOIC
• Manufacturer: Analog Devices Inc

Specifications of ADR01ARZ

• Temperature Coefficient: 10ppm/°C
• Design Resources: Precision, Bipolar Configuration for the AD5546/56 DAC (CN0024) Precision, Bipolar, Configuration for AD5547/AD5557 DAC (CN0028) Unipolar, Precision DC Digital-to-Analog Conversion Using AD5426/32/43 8-Bit to12-Bit DACs (CN0034) Unipolar, Precision DC Digital-to-Analog Conversion using AD5450/1/2/3 8-14-Bit DACs (CN0052) Precision, Bipolar, Configuration for AD5450/1/2/3 8-14bit Multiplying DACs (CN0053)
• Reference Type: Series
• Voltage - Output: 10V
• Tolerance: ±0.1%
• Voltage - Input: 12 ~ 36 V
• Number Of Channels: 1
• Current - Quiescent: 1mA
• Current - Output: 10mA
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: 8-SOIC (3.9mm Width)
• Topology: Series
• Input Voltage: 12V To 36V
• Reference Voltage: 10V
• Reference Voltage Tolerance: 10mV
• Voltage Reference Case Style: SOIC
• No. Of Pins: 8
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Current - Cathode: -
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant

ADR01/ADR02/ADR03/ADR06
The TEMP function is provided as a convenience rather than a
precise feature. Because the voltage at the TEMP node is
acquired from the band gap core, current pulling from this pin
has a significant effect on V
TEMP output with a suitable low bias current op amp, such as
the AD8601, AD820, or OP1177, all of which result in less than
a 100 µV change in ∆V
even tens of microamps drawn from the TEMP pin can cause
V
LOW COST CURRENT SOURCE
Unlike most references, the ADR01/ADR02/ADR03/ADR06
employ an NPN Darlington in which the quiescent current
remains constant with respect to the load current, as shown in
Figure 23. As a result, a current source can be configured as
shown in Figure 38 where I
the sum of I
0.55 mA to 0.65 mA, limiting this circuit to general-purpose
applications.
OUT
to fall out of specification.
0.80
0.70
0.60
0.55
0.50
0.45
0.40
0.75
0.65
–50
1.9mV/°C
V
SAMPLE SIZE = 5
SET
V
Figure 36. Voltage at TEMP Pin vs. Temperature
IN
TEMP
= 15V
and I
–25
Figure 37. Temperature Monitoring
Q
. Although simple, I
U2
OUT
0
OP1177
15V
TEMPERATURE (°C)
(see Figure 37). Without buffering,
V+
V–
SET
OUT
V
25
IN
= (V
. Care must be taken to buffer the
OUT
50
ΔV
V
TEMP TRIM
ADR01/
ADR02/
ADR03/
ADR06
IN
− V
TEMP
GND
U1
Q
V
L
/ΔT ≈ 1.96mV/°C
varies typically from
)/R
OUT
75
SET
. I
100
V
L
O
is simply
125
Rev. O | Page 16 of 20
PRECISION CURRENT SOURCE WITH
ADJUSTABLE OUTPUT
Alternatively, a precision current source can be implemented
with the circuit shown in Figure 39. By adding a mechanical or
digital potentiometer, this circuit becomes an adjustable current
source. If a digital potentiometer is used, the load current is
simply the voltage across Terminal B to Terminal W of the
digital potentiometer divided by R
where D is the decimal equivalent of the digital potentiometer
input code.
To optimize the resolution of this circuit, dual-supply op amps
should be used because the ground potential of ADR02 can
swing from −5.0 V at zero scale to V
potentiometer setting.
I
L
+12V
=
Figure 39. Programmable 0 mA to 5 mA Current Source
V
ADR01/
ADR02/
ADR03/
ADR06
REF
R
SET
×
GND
V
D
V
TEMP TRIM
IN
Figure 38. Low Cost Current Source
ADR01/
ADR02/
ADR03/
ADR06
IN
I
GND
Q
V
U1
–5V TO V
I
OUT
≈ 0.6mA
IN
V
OUT
R
L
AD5201
SET
0V TO (5V + V
R
U2
OP1177
100kΩ
L
+12V
–12V
V+
V–
A
B
V
SET
L
I
I
L
SET
L
.
W
= I
at full scale of the
L
)
= (V
SET
R
OUT
+ I
SET
R
Q
L
– V
L
1kΩ
1kΩ
)/R
V
SET
L
I
L
(1)