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參數資料
| 型號： | ADR439 |
| 廠商： | Analog Devices, Inc. |
| 元件分類： | 基準電壓源/電流源 |
| 英文描述： | Ultralow Noise XFET Voltage References with Current Sink and Source Capability |
| 中文描述： | 超低噪聲XFET電壓基準與電流吸入和源能力 |
| 文件頁數： | 19/24頁 |
| 文件大小： | 868K |
| 代理商： | ADR439 |
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 ADC for which the ADR431 is well suited
is the AD7701. Figure 40 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-) ADC, a
calibration microcontroller with on-chip static RAM, a clock
oscillator, and a serial communications port.
Rev. B | Page 19 of 24
SERIAL CLOCK
READ (TRANSMIT)
DATA READY
+5V
ANALOG
SUPPLY
SERIAL CLOCK
RANGES
SELECT
CALIBRATE
ANALOG
INPUT
ANALOG
GROUND
–5V
ANALOG
SUPPLY
DV
DD
SLEEP
MODE
DRDV
CS
SCLK
SDATA
CLKIN
CLKOUT
SC1
SC2
DGND
DV
SS
AV
SS
AGND
A
IN
CAL
BP/UP
V
REF
AV
DD
V
IN
V
OUT
GND
ADR431
AD7701
0.1
μ
F
0.1
μ
F
0.1
μ
F
0.1
μ
F
10
μ
F
0.1
μ
F
10
μ
F
0.1
μ
F
0
Figure 40. Voltage Reference for 16-Bit ADC AD7701
PRECISION BOOSTED OUTPUT REGULATOR
A precision voltage output with boosted current capability can
be realized with the circuit shown in Figure 41. In this circuit,
U2 forces V
O
to be equal to V
REF
by regulating the turn on of
N1. Therefore, the load current is furnished by V
IN
. In this
configuration, a 50 mA load is achievable at V
IN
of 5 V.
Moderate 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
may be added at the output to enhance the transient response.
V–
V+
+
–
0
V
IN
N1
U1
V
IN
V
OUT
TRIM
GND
4
5V
U2
2N7002
AD8601
ADR431
2
6
5
V
O
R
L
25
Figure 41. Precision Boosted Output Regulator
相關PDF資料 |
PDF描述 |
|---|---|
| ADR439A | Ultralow Noise XFET Voltage References with Current Sink and Source Capability |
| ADR433AR | Ultralow Noise XFET Voltage References with Current Sink and Source Capability |
| ADR430BR-REEL7 | Toggle Switch; Circuitry:SPDT; Switch Operation:On-None-On; Contact Current Max:6A; Actuator Style:Bat; Switch Terminals:Through Hole; Current Rating:6A; Leaded Process Compatible:Yes; Mounting Type:Bracket RoHS Compliant: Yes |
| ADR433BR-REEL7 | Ultralow Noise XFET Voltage References with Current Sink and Source Capability |
| ADR434AR-REEL7 | VARISTOR 140V RMS 20MM RADIAL |
相關代理商/技術參數 |
參數描述 |
|---|---|
| ADR439A | 制造商:AD 制造商全稱:Analog Devices 功能描述:Ultralow Noise XFET Voltage References with Current Sink and Source Capability |
| ADR439AR | 制造商:Analog Devices 功能描述:V-Ref Precision 4.5V 30mA 8-Pin SOIC N 制造商:Rochester Electronics LLC 功能描述:4.5 V REFERENCE - Bulk |
| ADR439ARM | 制造商:Analog Devices 功能描述:V-Ref Precision 4.5V 30mA 8-Pin MSOP Tube 制造商:Rochester Electronics LLC 功能描述:4.5 V REFERENCE - Bulk |
| ADR439ARM-REEL7 | 制造商:Analog Devices 功能描述:V-Ref Precision 4.5V 30mA 8-Pin MSOP T/R |
| ADR439ARMZ | 制造商:Analog Devices 功能描述:V-Ref Precision 4.5V 30mA 8-Pin MSOP Tube |
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