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參數資料
| 型號： | LT1021BCN8-5 |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 基準電壓源/電流源 |
| 英文描述： | Precision Reference |
| 中文描述： | 1-OUTPUT THREE TERM VOLTAGE REFERENCE, 5 V, PDIP8 |
| 封裝： | 0.300 INCH, PLASTIC, DIP-8 |
| 文件頁數： | 10/16頁 |
| 文件大?。?/td> | 227K |
| 代理商： | LT1021BCN8-5 |
10
LT1021
APPLICATIO
S I
FOR
ATIO
U
W
U
U
minimized. In the current output circuit, R1 determines
output current. It should have a TC commensurate with the
LT1021 or track closely with the feedback resistor around
the op amp.
Kelvin Connections
Although the LT1021 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
LT1021 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.
Capacitive Loading and Transient Response
The LT1021 is stable with all capacitive loads, but for
optimum settling with load transients, output capacitance
should be under 1000pF. The output stage of the reference
is class AB with a fairly low idling current. This makes
transient response worst-case at light load currents. Be-
cause of internal current drain on the output, actual worst-
case occurs at I
LOAD
= 0 on LT1021-5, I
LOAD
=
–0.8mA (sinking) on LT1021-7 and I
LOAD
= 1.4mA (sink-
ing) on LT1021-10. Significantly better load transient
response is obtained by moving slightly away from these
points. See Load Transient Response curves for details. In
general, best transient response is obtained when the
output is sourcing current. In critical applications, a 10
μ
F
solid tantalum capacitor with several ohms in series
provides optimum output bypass.
Standard Series Mode
LT1021
OUT
IN
GND
KEEP THIS LINE RESISTANCE LOW
LOAD
+
INPUT
GROUND
RETURN
1021 AI05
Series Mode with Boost Transistor
LT1021-7
OUT
IN
GND
R3
50k
RESISTOR TC DETERMINES I
OUT
TC
TC
≤
(10 R1) TC. R2 AND R3 SCALE
WITH R1 FOR DIFFERENT OUTPUT CURRENTS
*
**
R1*
7.15k
1.000mA
R2**
182k
1021 AI04
–
+
OP AMP
LT1021-7
OUT
IN
TC TRACKING TO 50ppm/
°
C
GND
R3
10k
R1*
200
1%
V
OUT
6.950V
R2*
14k
1%
1021 AI03
LT1021
OUT
GND
IN
LOAD
R1
220
2N3906
R2*
INPUT
GROUND
RETURN
*OPTIONAL—REDUCES CURRENT IN OUTPUT SENSE LEAD
R2 = 2.4k (LT1021-5), 3k (LT1021-7), 5.6k (LT1021-10)
1021 AI06
相關PDF資料 |
PDF描述 |
|---|---|
| LT1021BCN8-7 | Precision Reference |
| LT1021BMH-10 | Precision Reference |
| LT1021BMH-5 | Precision Reference |
| LT1021BMH-7 | Precision Reference |
| LT1021CCH-10 | Precision Reference |
相關代理商/技術參數 |
參數描述 |
|---|---|
| LT1021BCN8-5#PBF | 功能描述:IC VREF SERIES BURIED ZNR 8-PDIP RoHS:是 類別:集成電路 (IC) >> PMIC - 電壓基準 系列:- 標準包裝:1,000 系列:- 基準類型:旁路，可調節(jié)，精度 輸出電壓:2.495 V ~ 36 V 容差:±0.5% 溫度系數:標準值 34ppm/°C 輸入電壓:2.495 V ~ 36 V 通道數:1 電流 - 陰極:1mA 電流 - 靜態(tài):- 電流 - 輸出:100mA 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:TO-243AA 供應商設備封裝:SOT-89-3 包裝:帶卷 (TR) |
| LT1021BCN85PBF | 制造商:Linear Technology 功能描述:LT1021BCN85PBF |
| LT1021BCN8-7 | 功能描述:IC VREF SERIES SHUNT ZNR 8-PDIP RoHS:否 類別:集成電路 (IC) >> PMIC - 電壓基準 系列:- 標準包裝:2,000 系列:- 基準類型:旁路，可調節(jié)，精度 輸出電壓:1.24 V ~ 16 V 容差:±0.5% 溫度系數:- 輸入電壓:1.24 V ~ 16 V 通道數:1 電流 - 陰極:100µA 電流 - 靜態(tài):- 電流 - 輸出:20mA 工作溫度:-40°C ~ 85°C 安裝類型:通孔 封裝/外殼:TO-226-3、TO-92-3（TO-226AA）成形引線 供應商設備封裝:TO-92-3 包裝:帶卷 (TR) |
| LT1021BCN8-7#PBF | 功能描述:IC VREF SERIES SHUNT ZNR 8-PDIP RoHS:是 類別:集成電路 (IC) >> PMIC - 電壓基準 系列:- 標準包裝:3,000 系列:- 基準類型:旁路，精度 輸出電壓:3V 容差:±0.5% 溫度系數:100ppm/°C 輸入電壓:- 通道數:1 電流 - 陰極:82µA 電流 - 靜態(tài):- 電流 - 輸出:15mA 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:6-TSSOP（5 引線），SC-88A，SOT-353 供應商設備封裝:SC-70-5 包裝:帶卷 (TR) 其它名稱:296-20888-2 |
| LT1021BMH-10 | 功能描述:IC VREF SERIES SHUNT ZNR 10V TO5 RoHS:否 類別:集成電路 (IC) >> PMIC - 電壓基準 系列:- 標準包裝:2,000 系列:- 基準類型:旁路，可調節(jié)，精度 輸出電壓:1.24 V ~ 16 V 容差:±0.5% 溫度系數:- 輸入電壓:1.24 V ~ 16 V 通道數:1 電流 - 陰極:100µA 電流 - 靜態(tài):- 電流 - 輸出:20mA 工作溫度:-40°C ~ 85°C 安裝類型:通孔 封裝/外殼:TO-226-3、TO-92-3（TO-226AA）成形引線 供應商設備封裝:TO-92-3 包裝:帶卷 (TR) |
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