ADR431ARMZ Analog Devices Inc, ADR431ARMZ Datasheet - Page 20

IC VOLT REF XFET 2.5V 8-MSOP

ADR431ARMZ

Manufacturer Part Number
ADR431ARMZ
Description
IC VOLT REF XFET 2.5V 8-MSOP
Manufacturer
Analog Devices Inc
Series
XFET®r
Datasheet

Specifications of ADR431ARMZ

Temperature Coefficient
10ppm/°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) AD5390/91/92 Channel Monitor Function (CN0030) 16 Channels of Programmable Output Span Using AD5360 (CN0131) 40 Channels of Programmable Output Span Using AD5371 (CN0149)
Reference Type
Series
Voltage - Output
2.5V
Tolerance
±0.12%
Voltage - Input
4.5 ~ 18 V
Number Of Channels
1
Current - Quiescent
800µA
Current - Output
30mA
Operating Temperature
-40°C ~ 125°C
Mounting Type
Surface Mount
Package / Case
8-MSOP, Micro8™, 8-uMAX, 8-uSOP,
Topology
Series
Input Voltage
4.5V To 18V
Reference Voltage
2.5V
Reference Voltage Tolerance
3mV
Voltage Reference Case Style
MSOP
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
ADR430/ADR431/ADR433/ADR434/ADR435/ADR439
PRECISION VOLTAGE REFERENCE FOR DATA
CONVERTERS
The ADR43x family has a number of features that make it ideal
for use with ADCs and DACs. The exceptional low noise, tight
temperature coefficient, and high accuracy characteristics make
the ADR43x ideal for low noise applications, such as cellular
base station applications.
Another example of an ADC for which the ADR431 is well
suited is the AD7701. Figure 43 shows the ADR431 used as
the precision reference for this converter. The AD7701 is a 16-bit
ADC with on-chip digital filtering intended for the measurement
of wide dynamic range and low frequency signals, such as those
representing chemical, physical, or biological processes. It contains
a charge-balancing Σ-Δ ADC, a calibration microcontroller
with on-chip static RAM, a clock oscillator, and a serial
communications port.
ANALOG
SUPPLY
CALIBRATE
GROUND
ANALOG
RANGES
ANALOG
ANALOG
+5V
SELECT
SUPPLY
INPUT
–5V
0.1µF
Figure 43. Voltage Reference for the AD7701 16-Bit ADC
0.1µF
0.1µF
10µF
ADR431
10µF
GND
V
0.1µF
V
2
4
IN
OUT
6
BP/UP
CAL
AGND
AV
V
A
AV
REF
IN
DD
SS
AD7701
CLKOUT
SDATA
SLEEP
MODE
CLKIN
DGND
DRDY
SCLK
DV
DV
SC1
SC2
CS
DD
SS
0.1µF
DATA READY
READ (TRANSMIT)
SERIAL CLOCK
SERIAL CLOCK
0.1µF
Rev. H | Page 20 of 24
PRECISION BOOSTED OUTPUT REGULATOR
A precision voltage output with boosted current capability can
be realized with the circuit shown in Figure 44. In this circuit,
U2 forces V
N1. Therefore, the load current is furnished by V
configuration, a 50 mA load is achievable at a V
heat is generated on the MOSFET, and higher current can be
achieved with a replacement of the larger device. In addition,
for a heavy capacitive load with step input, a buffer can be
added at the output to enhance the transient response.
V
IN
ADR431
GND
V
2
U1
4
IN
V
TRIM
O
OUT
Figure 44. Precision Boosted Output Regulator
to be equal to V
6
5
+
U2
AD8601
REF
5V
V+
V–
by regulating the turn-on of
2N7002
N1
IN
of 5 V. Moderate
IN
. In this
25Ω
R
L
V
O

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