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參數(shù)資料
| 型號： | ADR421BR-REEL7 |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 基準電壓源/電流源 |
| 英文描述： | 10/100-ST SM PLUS |
| 中文描述： | 1-OUTPUT THREE TERM VOLTAGE REFERENCE, 2.5 V, PDSO8 |
| 封裝： | MS-012AA, SOIC-8 |
| 文件頁數(shù)： | 15/16頁 |
| 文件大?。?/td> | 223K |
| 代理商： | ADR421BR-REEL7 |
REV. B
ADR420/ADR421/ADR423/ADR425
–15–
Table III. V
REFX
vs. R1 and R2
V
IN
DACA
V
REFA
V
OUTA
DACB
V
REFB
V
OUTB
DACC
V
REFC
V
OUTC
DACD
V
REFD
V
OUTD
AD7398
ADR425
R1
0.1%
R2
0.1%
V
REF
V
OB
= V
REFX
(D
B
)
V
OC
= V
REFX
(D
C
)
V
OD
= V
REFX
(D
D
)
Figure 11. Programmable DAC Reference
Precision Voltage Reference for Data Converters
The ADR42x family has a number of features that make it ideal
for use with A/D and D/A converters. The exceptional low noise,
tight temperature coefficient, and high accuracy characteristics
make the ADR42x ideal for low noise applications such as cellular
base station applications.
Another example of ADC for which the ADR421 is also well-suited
is the AD7701. Figure 12 shows the ADR421 used as the precision
reference for this converter. The AD7701 is a 16-bit A/D converter
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 (sigma-delta) ADC, calibration microcontroller with on-chip
static RAM, a clock oscillator, and a serial communications port.
V
IN
GND
ADR42x
0.1 F
SC1
V
OUT
MODE
CLKOUT
0.1 F
10 F
0.1 F
0.1 F
0.1 F
0.1 F
10 F
AD7701
–
5V
ANALOG
SUPPLY
AGND
A
IN
AV
SS
CAL
BP/
UP
V
REF
AV
DD
DV
SS
DGND
SC2
CLKIN
SCLK
SDATA
DRDV
CS
SLEEP
DV
DD
DATA READY
READ (TRANSMIT)
SERIAL CLOCK
SERIAL CLOCK
+5V
ANALOG
SUPPLY
ANALOG
GROUND
ANALOG
INPUT
CALIBRATE
RANGES
SELECT
Figure 12. Voltage Reference for 16-Bit A/D Converter
AD7701
Precision Boosted Output Regulator
A precision voltage output with boosted current capability can
be realized with the circuit shown in Figure 13. In this circuit,
U
2
forces V
O
to be equal to V
REF
by regulating the turn on of
N
1
, therefore, the load current will be furnished by V
IN
. In this
configuration, a 50 mA load is achievable at V
IN
of 5 V. Moder-
ate heat will be generated on the MOSFET and higher current
can be achieved with a replacement of the larger device. In
addition, for heavy capacitive load with step input, a buffer may
be added at the output to enhance the transient response.
AD8601
V
–
V
IN
V
O
R
L
25
N1
2 U1
V
IN
GND
4
5
6
U2
2N7002
5V
V+
ADR421
V
OUT
TRIM
Figure 13. Precision Boosted Output Regulator
R1, R2
Digital Code
V
REF
2 V
REF
1.3 V
REF
V
REF
4 V
REF
1.6 V
REF
V
REF
R1 = R2
R1 = R2
R1 = R2
R1 = 3R2
R1 = 3R2
R1 = 3R2
0000 0000 0000
1000 0000 0000
1111 1111 1111
0000 0000 0000
1000 0000 0000
1111 1111 1111
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