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參數(shù)資料
| 型號(hào)： | LT1236-10 |
| 廠商： | Linear Technology Corporation |
| 英文描述： | Precision Reference |
| 中文描述： | 精密參考 |
| 文件頁(yè)數(shù)： | 8/12頁(yè) |
| 文件大?。?/td> | 262K |
| 代理商： | LT1236-10 |
8
LT1236
APPLICATIO
S I
FOR
ATIO
U
Kelvin Connections
Although the LT1236 does not have true force/sense
capability at its outputs, significant improvements in ground
loop and line loss problems can be achieved with proper
hook-up. In series mode operation, the ground pin of the
LT1236 carries only
≈
1mA and can be used as a sense
line, greatly reducing ground loop and loss problems on
the low side of the reference. The high side supplies load
current so line resistance must be kept low. Twelve feet of
#22 gauge hook-up wire or 1 foot of 0.025 inch printed
circuit trace will create 2mV loss at 10mA output current.
This is equivalent to 1LSB in a 10V, 12-bit system.
The following circuits show proper hook-up to minimize
errors due to ground loops and line losses. Losses in the
output lead can be greatly reduced by adding a PNP boost
transistor if load currents are 5mA or higher. R2 can be
added to further reduce current in the output sense lead.
W
U
U
Effects of Air Movement on Low Frequency Noise
The LT1236 has very low noise because of the buried zener
used in its design. In the 0.1Hz to 10Hz band, peak-to-peak
noise is about 0.5ppm of the DC output. To achieve this
low noise, however, care must be taken to shield the
reference from ambient air turbulence. Air movement can
create noise because of thermoelectric differences be-
tween IC package leads and printed circuit board materials
and/or sockets. Power dissipation in the reference, even
though it rarely exceeds 20mW, is enough to cause small
Series Mode with Boost Transistor
LT1236
OUT
GND
IN
LOAD
R1
220
2N3906
R2*
INPUT
GROUND
RETURN
*OPTIONAL—REDUCES CURRENT IN OUTPUT SENSE
LEAD: R2 = 2.4k (LT1236-5), 5.6k (LT1236-10)
LT1236 AI04
temperature gradients in the package leads. Variations in
thermal resistance, caused by uneven air flow, create
differential lead temperatures, thereby causing thermo-
electric voltage noise at the output of the reference.
Standard Series Mode
LT1236
OUT
IN
GND
KEEP THIS LINE RESISTANCE LOW
LOAD
+
INPUT
GROUND
RETURN
LT1236 AI03
TYPICAL APPLICATIO
N
S
LT1236 TA10
LT1236A-10
OUT
TRIM
IN
GND
R2
50k
10.000V
R1
75k
TRIM RANGE
≈
±
10mV
V
IN
Negative Series Reference
LT1236-10
OUT
IN
GND
LT1236 TA04
D1
15V
R1
4.7k
–10V AT
50mA
R2
4.7k
–15V
15V
Q1
2N2905
Restricted Trim Range for Improved
Resolution, 10V, “A” Version Only
LT1236 TA03
LT1236-10
OUT
TRIM
IN
GND
V
IN
V
OUT
R1*
10k
CAN BE RAISED TO 20k FOR LESS
CRITICAL APPLICATIONS
*
LT1236-10 Full Trim Range (
±
0.7%)
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PDF描述 |
|---|---|
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LT1236-5 | 制造商:LINER 制造商全稱:Linear Technology 功能描述:Precision Reference |
| LT1236A-10 | 制造商:LINER 制造商全稱:Linear Technology 功能描述:Dual Current Output 12-/14-/16-Bit SoftSpan DACs with Parallel I/O |
| LT1236A-5 | 制造商:LINER 制造商全稱:Linear Technology 功能描述:2-Channel Differential Input 24-Bit No Latency DS ADC |
| LT1236AC | 制造商:LINER 制造商全稱:Linear Technology 功能描述:Precision Reference |
| LT1236ACN8-10 | 功能描述:IC VREF SERIES SHUNT PREC 8-PDIP RoHS:否 類別:集成電路 (IC) >> PMIC - 電壓基準(zhǔn) 系列:- 產(chǎn)品培訓(xùn)模塊:Voltage Reference Basics 標(biāo)準(zhǔn)包裝:100 系列:- 基準(zhǔn)類型:旁路，精度 輸出電壓:4.096V 容差:±0.075% 溫度系數(shù):50ppm/°C 輸入電壓:- 通道數(shù):1 電流 - 陰極:1µA 電流 - 靜態(tài):- 電流 - 輸出:10mA 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:8-SOIC（0.154"，3.90mm 寬） 供應(yīng)商設(shè)備封裝:8-SOIC 包裝:管件 |
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