ADR421BRZ Analog Devices Inc, ADR421BRZ Datasheet - Page 15

• Manufacturer Part Number: ADR421BRZ
• Description: IC REF PREC LONOISE 2.50V 8-SOIC
• Manufacturer: Analog Devices Inc
• Series: XFET®r

Specifications of ADR421BRZ

• Temperature Coefficient: 3ppm/°C
• Design Resources: 40 Channels of Programmable Voltage with Excellent Temperature Drift Performance Using AD5380 (CN0007) 40 Channels of Programmable Voltage with Excellent Temperature Drift Performance Using AD5381 (CN0010) 32 Channels of Programmable Voltage with Excellent Temperature Drift Performance Using AD5382 (CN0011) 32 Channels of Programmable Voltage with Excellent Temperature Drift Performance Using AD5383 (CN0014) 8 to 16 Channels of Programmable Voltage with Excellent Temperature Drift Performance Using AD5390/1/2 (CN0029) High Precision Digital-to-Analog Conversion Using the 16-Bit AD5542/1, ADR421, and AD8628 (CN0079) 16 Channels of Programmable Output Span Using AD5360 (CN0131) Layout Considerations for an Expandable Multichannel Simultaneous Sampling Data Acquisition System Based on AD7606 (CN0148) 40 Channels of Programmable Output Span Using AD5371 (CN0149) Software Calibrated, 1 MHz to 8 GHz, 70 dB RF Power Measurement System Using AD8318 (CN0150) How to Achieve High Precision Voltage Level Setting Using AD5541A/42A (CN0169)
• Reference Type: Series
• Voltage - Output: 2.5V
• Tolerance: ±0.04%
• Voltage - Input: 4.5 ~ 18 V
• Number Of Channels: 1
• Current - Quiescent: 500µA
• Current - Output: 10mA
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: 8-SOIC (3.9mm Width)
• Topology: Series
• Input Voltage: 4.5V To 18V
• Reference Voltage: 2.5V
• Reference Voltage Tolerance: 1mV
• 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

TERMINOLOGY
Temperature Coefficient
The change of output voltage over the operating temperature
range is normalized by the output voltage at 25°C, and
expressed in ppm/°C as
where:
V
V
V
Line Regulation
The change in output voltage due to a specified change in input
voltage. It includes the effects of self-heating. Line regulation is
expressed in either percent per volt, parts per million per volt,
or microvolts per volt change in input voltage.
Load Regulation
The change in output voltage due to a specified change in load
current. It includes the effects of self-heating. Load regulation is
expressed in either microvolts per milliampere, parts per
million per milliampere, or ohms of dc output resistance.
Long-Term Stability
Typical shift of output voltage at 25°C on a sample of parts
subjected to operation life test of 1000 hours at 125°C.
where:
V
V
OUT
OUT
OUT
OUT
OUT
TCV
(25°C) = V
(T
(T
Δ
Δ
(t
(t
V
V
0
1
1
2
) = V
) = V
) = V
) = V
OUT
OUT
OUT
(
OUT
OUT
=
ppm
(
OUT
OUT
ppm
V
OUT
at 25°C at Time 0.
at 25°C after 1000 hours operation at 125°C.
OUT
at Temperature 1.
at Temperature 2.
)
/
=
at 25°C.
°
( )
t
C
V
0
)
OUT
=
−
V
V
( )
V
t
V
OUT
OUT
0
OUT
OUT
−
(
( )
( )
t
25
V
( )
t
T
1
0
OUT
2
°
C
−
)
( )
×
t
V
1
(
OUT
T
×
2
10
( )
−
T
1
T
6
1
)
×
10
6
Rev. H | Page 15 of 24
Thermal Hysteresis
The change of output voltage after the device is cycled through
temperatures from +25°C to −40°C to +125°C and back to
+25°C. This is a typical value from a sample of parts put
through such a cycle.
where:
V
V
−40°C to +125°C and back to +25°C.
Input Capacitor
Input capacitors are not required on the ADR42x. There is
no limit for the value of the capacitor used on the input, but a
1 μF to 10 μF capacitor on the input improves transient response
in applications where the supply suddenly changes. An addi-
tional 0.1 μF capacitor in parallel also helps to reduce noise
from the supply.
Output Capacitor
The ADR42x do not need output capacitors for stability under
any load condition. An output capacitor, typically 0.1 μF, filters
out any low level noise voltage and does not affect the operation
of the part. On the other hand, the load transient response can
be improved with an additional 1 μF to 10 μF output capacitor
in parallel. A capacitor here acts as a source of stored energy for
sudden increase in load current. The only parameter that
degrades by adding an output capacitor is the turn-on time,
which depends on the size of the selected capacitor.
OUT
OUT_TC
V
V
(25°C) = V
OUT
OUT
= V
_
_
ADR420/ADR421/ADR423/ADR425
OUT
HYS
HYS
(
at 25 °C after temperature cycle at +25°C to
=
ppm
OUT
V
OUT
at 25°C.
)
=
(
25
V
OUT
°
C
)
(
V
−
25
OUT
V
°
C
OUT
(
)
25
−
_
°
TC
V
C
OUT
)
_
TC
×
10
6