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參數資料
| 型號： | ADR439BR-REEL7 |
| 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： | 1-OUTPUT THREE TERM VOLTAGE REFERENCE, 4.5 V, PDSO8 |
| 封裝： | MS-012AA, SOIC-8 |
| 文件頁數： | 19/24頁 |
| 文件大小： | 868K |
| 代理商： | ADR439BR-REEL7 |
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
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相關代理商/技術參數 |
參數描述 |
|---|---|
| ADR439BRZ | 制造商:Analog Devices 功能描述:V-Ref Precision 4.5V 30mA 8-Pin SOIC N Tube |
| ADR439BRZ-REEL7 | 功能描述:IC VREF SERIES PREC 4.5V 8-SOIC RoHS:是 類別:集成電路 (IC) >> PMIC - 電壓基準 系列:XFET® 產品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:50 系列:- 基準類型:串聯，隱埋式齊納 輸出電壓:2.5V 容差:±0.04% 溫度系數:2ppm/°C 輸入電壓:8 V ~ 36 V 通道數:1 電流 - 陰極:- 電流 - 靜態:3mA 電流 - 輸出:15mA 工作溫度:0°C ~ 70°C 安裝類型:通孔 封裝/外殼:8-DIP（0.300"，7.62mm） 供應商設備封裝:8-PDIP 包裝:管件 |
| ADR440 | 制造商:AD 制造商全稱:Analog Devices 功能描述:Ultralow Noise, LDO XFET Voltage References with Current Sink and Source |
| ADR440_10 | 制造商:AD 制造商全稱:Analog Devices 功能描述:Ultralow Noise, LDO XFET Voltage References with Current Sink and Source |
| ADR440A | 制造商:AD 制造商全稱:Analog Devices 功能描述:Ultralow Noise, LDO XFET Voltage References with Current Sink and Source |
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