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参数资料
| 型号： | LT1021DCH-10#TR |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 基准电压源/电流源 |
| 英文描述： | 1-OUTPUT THREE TERM VOLTAGE REFERENCE, 10 V, MBCY8 |
| 封装： | 0.200 INCH, METAL CAN, TO-5, 8 PIN |
| 文件页数： | 16/16页 |
| 文件大小： | 228K |
| 代理商： | LT1021DCH-10#TR |
9
LT1021
1021fc
APPLICATIONS INFORMATION
WU
U
Maximum Allowable Reference Drift
Trimming Output Voltage
LT1021-10
The LT1021-10 has a trim pin for adjusting output voltage.
The impedance of the trim pin is about 12k
with a
nominal open-circuit voltage of 5V. It is designed to be
driven from a source impedance of 3k
or less to mini-
mize changes in the LT1021 TC with output trimming.
Attenuation between the trim pin and the output is 70:1.
This allows
±70mV trim range when the trim pin is tied to
the wiper of a potentiometer connected between the
output and ground. A 10k
potentiometer is recom-
mended, preferably a 20 turn cermet type with stable
characteristics over time and temperature.
Effect of Reference Drift on System Accuracy
A large portion of the temperature drift error budget in
many systems is the system reference voltage. This graph
indicates the maximum temperature coefficient allowable
if the reference is to contribute no more than 0.5LSB error
to the overall system performance. The example shown is
a 12-bit system designed to operate over a temperature
range from 25
°C to 65°C. Assuming the system calibra-
tion is performed at 25
°C, the temperature span is 40°C.
It can be seen from the graph that the temperature coeffi-
cient of the reference must be no worse than 3ppm/
°C if
it is to contribute less than 0.5LSB error. For this reason,
the LT1021 family has been optimized for low drift.
The LT1021-10 “C” version is pre-trimmed to
±5mV and
therefore can utilize a restricted trim range. A 75k resistor
in series with a 20k
potentiometer will give ±10mV trim
range. Effect on the output TC will be only 1ppm/
°C for the
±5mV trim needed to set the “C” device to 10.000V.
LT1021-5
The LT1021-5 does have an output voltage trim pin, but
the TC of the nominal 4V open-circuit voltage at this pin is
about – 1.7mV/
°C. For the voltage trimming not to affect
reference output TC, the external trim voltage must track
the voltage on the trim pin. Input impedance of the trim pin
is about 100k
and attenuation to the output is 13:1. The
technique shown below is suggested for trimming the
output of the LT1021-5 while maintaining minimum shift
in output temperature coefficient. The R1/R2 ratio is
chosen to minimize interaction of trimming and TC shifts,
so the exact values shown should be used.
LT1021-5
OUT
IN
GND
TRIM
R1
27k
R2
50k
1N4148
VOUT
1021 AI02
TEMPERATURE SPAN (
°C)
10
0
MAXIMUM
TEMPERATURE
COEFFICIENT
FOR
0.5LSB
ERROR
(ppm/
°C)
30
100
LT1021 AI01
1.0
10
20
100
90
80
70
60
50
40
8-BIT
10-BIT
12-BIT
14-BIT
LT1021-7
The 7V version of the LT1021 has no trim pin because the
internal architecture does not have a point which could be
driven conveniently from the output. Trimming must
therefore be done externally, as is the case with ordinary
reference diodes. Unlike these diodes, however, the out-
put of the LT1021 can be loaded with a trim potentiometer.
The following trim techniques are suggested; one for
voltage output and one for current output. The voltage
output is trimmed for 6.95V. Current output is 1mA, as
shown, into a summing junction, but all resistors may be
scaled for currents up to 10mA.
Both of these circuits use the trimmers in a true potentio-
metric mode to reduce the effects of trimmer TC. The
voltage output has a 200
impedance, so loading must be
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LT1021DCH-5 | 制造商:Linear Technology 功能描述:V-Ref Precision 5V 10mA 8-Pin TO-5 |
| LT1021DCH-7 | 制造商:Linear Technology 功能描述:V-Ref Precision 7V 10mA 8-Pin TO-5 |
| LT1021DCN8-10 | 功能描述:IC VREF SERIES SHUNT ZNR 8-PDIP RoHS:否 类别:集成电路 (IC) >> PMIC - 电压基准 系列:- 产品培训模块:Voltage Reference Basics 标准包装:100 系列:- 基准类型:旁路，精度 输出电压:4.096V 容差:±0.075% 温度系数:50ppm/°C 输入电压:- 通道数:1 电流 - 阴极:1µA 电流 - 静态:- 电流 - 输出:10mA 工作温度:0°C ~ 70°C 安装类型:表面贴装 封装/外壳:8-SOIC（0.154"，3.90mm 宽） 供应商设备封装:8-SOIC 包装:管件 |
| LT1021DCN8-10#PBF | 功能描述:IC VREF SERIES SHUNT ZNR 8-PDIP RoHS:是 类别:集成电路 (IC) >> PMIC - 电压基准 系列:- 标准包装:3,000 系列:- 基准类型:旁路，精度 输出电压:3V 容差:±0.5% 温度系数:100ppm/°C 输入电压:- 通道数:1 电流 - 阴极:82µA 电流 - 静态:- 电流 - 输出:15mA 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:6-TSSOP（5 引线），SC-88A，SOT-353 供应商设备封装:SC-70-5 包装:带卷 (TR) 其它名称:296-20888-2 |
| LT1021DCN8-10PBF | 制造商:Linear Technology 功能描述:Voltage Reference Prec. 10V 10mA PDIP8 |
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