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ADR421BR(RevJ) Ultraprecision, Low Noise, 2.048 V/2.500 V/3.00 V/5.00 V XFET® Voltage References ADI
Analog Devices ADI
ADR421BR Datasheet PDF : 24 Pages
First Prev 21 22 23 24
Data Sheet
PRECISION VOLTAGE REFERENCE FOR DATA
CONVERTERS
The ADR42x family has a number of features that make it ideal
for use with ADCs and DACs. The exceptionally low noise,
tight temperature coefficient, and high accuracy characteristics
make the ADR42x ideal for low noise applications such as
cellular base station applications.
AD7701 is an example of an ADC that is well suited for the
ADR42x. The ADR421 is used as the precision reference for
the converter in Figure 48. The AD7701 is a 16-bit ADC with
on-chip digital filtering intended for measuring wide dynamic
range and low frequency signals, such as those representing
chemical, physical, or biological processes. It contains a charge-
balancing (Σ-∆) ADC, calibration microcontroller with on-chip
static RAM, clock oscillator, and serial communications port.
+5V
ANALOG
SUPPLY 0.1µF
10µF
AD7701
0.1µF
VIN
VOUT
ADR420/
ADR421/
ADR423/
ADR425
GND
AVDD
VREF
RANGES
SELECT
CALIBRATE
ANALOG
INPUT
ANALOG
GROUND
0.1µF
–5V
ANALOG
SUPPLY
0.1µF
10µF
BP/UP
CAL
AIN
AGND
AVSS
DVDD
SLEEP
MODE
DRDY
CS
SCLK
SDATA
CLKIN
0.1µF
DATA READY
READ (TRANSMIT)
SERIAL CLOCK
SERIAL CLOCK
CLKOUT
SC1
SC2
DGND
DVSS
0.1µF
Figure 48. Voltage Reference for 16-Bit ADC AD7701
ADR420/ADR421/ADR423/ADR425
PRECISION BOOSTED OUTPUT REGULATOR
A precision voltage output with boosted current capability
can be realized with the circuit shown in Figure 49. In this
circuit, U2 forces VOUT to be equal to VREF by regulating the turn
on of N1. Therefore, the load current is furnished by VIN. In
this configuration, a 50 mA load is achievable at VIN of 5 V.
Moderate heat is generated on the MOSFET, and higher current
can be achieved by replacing the larger device. In addition, for
a heavy capacitive load with step input, a buffer may be added
at the output to enhance the transient response.
N1
VIN
2 U1
VIN
VOUT 6
ADR421
5
TRIM
GND
4
5V
2N7002
+ V+
U2
AD8601
V–
VOUT
RL
25
Figure 49. Precision Boosted Output Regulator
Rev. J | Page 21 of 24
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