datasheetbank_Logo   전자부품 반도체 검색엔진( 무료 PDF 다운로드 ) - 데이터시트뱅크
부품명 :   

ADR421BR-REEL7-RevJ 데이터 시트보기 (PDF) - Analog Devices

부품명상세내역제조사
ADR421BR-REEL7(RevJ) Ultraprecision, Low Noise, 2.048 V/2.500 V/3.00 V/5.00 V XFET® Voltage References ADI
Analog Devices ADI
ADR421BR-REEL7 Datasheet PDF : 24 Pages
First Prev 11 12 13 14 15 16 17 18 19 20 Next Last
ADR420/ADR421/ADR423/ADR425
APPLICATIONS
OUTPUT ADJUSTMENT
The ADR42x trim terminal can be used to adjust the output
voltage over a ±0.5% range. This feature allows the system
designer to trim system errors out by setting the reference to
a voltage other than the nominal. This is also helpful if the
part is used in a system at temperature to trim out any error.
Adjustment of the output has a negligible effect on the
temperature performance of the device. To avoid degrading
temperature coefficients, both the trimming potentiometer
and the two resistors need to be low temperature coefficient
types, preferably <100 ppm/°C.
INPUT
2
VIN VOUT 6
ADR420/
ADR421/
ADR423/
ADR425
GND TRIM 5
4
OUTPUT
VOUT = ±0.5%
R1
470k
RP
10k
R2
10k(ADR420)
15k(ADR421)
Figure 40. Output Trim Adjustment
REFERENCE FOR CONVERTERS IN OPTICAL
NETWORK CONTROL CIRCUITS
In the high capacity, all optical router network of Figure 41,
arrays of micromirrors direct and route optical signals from
fiber to fiber, without first converting them to electrical form,
which reduces the communication speed. The tiny micro-
mechanical mirrors are positioned so that each is illuminated
by a single wavelength that carries unique information and
can be passed to any desired input and output fiber. The mirrors
are tilted by the dual-axis actuators controlled by precision
analog-to-digital converters (ADCs) and digital-to-analog
converters (DACs) within the system. Due to the microscopic
movement of the mirrors, not only is the precision of the
converters important, but the noise associated with these
controlling converters is extremely critical, because total noise
within the system can be multiplied by the numbers of
converters used. Consequently, the exceptional low noise of the
ADR42x is necessary to maintain the stability of the control
loop for this application.
Data Sheet
SOURCE FIBER
GIMBAL + SENSOR
LASER BEAM
ACTIVATOR
LEFT
MEMS MIRROR
DESTINATION
FIBER
ACTIVATOR
RIGHT
AMPL
PREAMP
AMPL
CONTROL
ELECTRONICS
DAC
ADC
DAC
ADR421
ADR421
ADR421
DSP
Figure 41. All Optical Router Network
HIGH VOLTAGE FLOATING CURRENT SOURCE
The circuit in Figure 42 can be used to generate a floating
current source with minimal self-heating. This particular
configuration can operate on high supply voltages determined
by the breakdown voltage of the N-channel JFET.
+VS
SST111
VISHAY
2
VIN
ADR420/
ADR421/
ADR423/
ADR425
VOUT 6
GND
4
OP09
2N3904
RL
2.10k
–VS
Figure 42. High Voltage Floating Current Source
Rev. J | Page 18 of 24
Direct download click here
 

Share Link : ADI
All Rights Reserved © datasheetbank.com 2014 - 2019 [ 개인정보 보호정책 ] [ 요청 데이타시트 ][ 제휴문의 ]