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参数资料
| 型号： | REF5045IDGKT |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 基准电压源/电流源 |
| 英文描述： | 1-OUTPUT THREE TERM VOLTAGE REFERENCE, 4.5 V, PDSO8 |
| 封装： | PLASTIC, MSOP-8 |
| 文件页数： | 3/27页 |
| 文件大小： | 976K |
| 代理商： | REF5045IDGKT |
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Drift +
V
OUTMAX
* VOUTMIN
V
OUT
Temp Range
106(ppm)
DNC
TEMP
V
OUT
V
IN
GND
DNC
NC
TRIM/NR
REF50xx
V
TEMP
2.6mV/ C
°
OPA(1)
NOTE:(1)Lowdriftopamp,suchastheOPA333,OPA335,orOPA376.
+V
V
=
HYST
10 (ppm)
6
(
|V
V
|
V
PRE
POST
NOM
-
www.ti.com
SBOS410E – JUNE 2007 – REVISED JUNE 2010
TEMPERATURE DRIFT
To avoid errors caused by low-impedance loading,
buffer
the
TEMP
pin
output
with
a
suitable
The REF50xx is designed for minimal drift error,
low-temperature drift op amp, such as the OPA333,
which is defined as the change in output voltage over
temperature. The drift is calculated using the box
method, as described by the following equation:
(1)
The REF50xx features a maximum drift coefficient of
3ppm/°C for the high-grade version, and 8ppm/°C for
the standard-grade.
space
THERMAL HYSTERESIS
Thermal hysteresis for the REF50xx is defined as the
Figure 32. Buffering the TEMP Pin Output
change in output voltage after operating the device at
+25°C, cycling the device through the specified
POWER DISSIPATION
temperature range, and returning to +25°C. It can be
expressed as Equation 2:
The REF50xx family is specified to deliver current
loads of ±10mA over the specified input voltage
range. The temperature of the device increases
according to the equation:
(2)
TJ = TA + PD × qJA
(3)
Where:
VHYST = thermal hysteresis (in units of ppm).
TJ = Junction temperature (°C)
VNOM = the specified output voltage.
TA = Ambient temperature (°C)
VPRE = output voltage measured at +25°C
PD = Power dissipated (W)
pretemperature cycling.
qJA = Junction-to-ambient thermal resistance
VPOST = output voltage measured after the device
(°C/W)
has
been
cycled
from
+25°C
through
the
specified temperature range of –40°C to +125°C
The REF50xx junction temperature must not exceed
and returned to +25°C.
the absolute maximum rating of +150°C.
TEMPERATURE MONITORING
NOISE PERFORMANCE
The temperature output terminal (TEMP, pin 3)
Typical 0.1Hz to 10Hz voltage noise for each member
provides a temperature-dependent voltage output
of the REF50xx family is specified in the Electrical
with approximately 60k
source impedance. As seen
Characteristics: Per Device table. The noise voltage
in Figure 8, the output voltage follows the nominal
increases
with
output
voltage
and
operating
relationship:
temperature. Additional filtering can be used to
improve output noise levels, although care should be
VTEMP PIN = 509mV + 2.64 × T(°C)
taken to ensure the output impedance does not
This pin indicates general chip temperature, accurate
degrade performance.
to approximately ±15°C. Although it is not generally
For additional information about how to minimize
suitable for accurate temperature measurements, it
noise and maximize performance in mixed-signal
can be used to indicate temperature changes or for
applications such as data converters, refer to the
temperature compensation of analog circuitry. A
series of Analog Applications Journal articles entitled,
temperature change of 30°C corresponds to an
How a Voltage Reference Affects ADC Performance.
approximate 79mV change in voltage at the TEMP
This three-part series is available for download from
pin.
the TI website under three literature numbers:
The TEMP pin has high output impedance (see
Figure 28). Loading this pin with a low-impedance
and Part III, respectively.
circuit induces a measurement error; however, it does
not have any effect on VOUT accuracy.
Copyright 2007–2010, Texas Instruments Incorporated
11
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相关代理商/技术参数 |
参数描述 |
|---|---|
| REF5045IDR | 功能描述:基准电压& 基准电流 Lo Noise Very Low Drift Prec VLTG REF RoHS:否 制造商:STMicroelectronics 产品:Voltage References 拓扑结构:Shunt References 参考类型:Programmable 输出电压:1.24 V to 18 V 初始准确度:0.25 % 平均温度系数（典型值）:100 PPM / C 串联 VREF - 输入电压（最大值）: 串联 VREF - 输入电压（最小值）: 分流电流（最大值）:60 mA 最大工作温度:+ 125 C 封装 / 箱体:SOT-23-3L 封装:Reel |
| REF5045IDRG4 | 功能描述:基准电压& 基准电流 Low Noise Very Low Drift Prec Vltg Ref RoHS:否 制造商:STMicroelectronics 产品:Voltage References 拓扑结构:Shunt References 参考类型:Programmable 输出电压:1.24 V to 18 V 初始准确度:0.25 % 平均温度系数（典型值）:100 PPM / C 串联 VREF - 输入电压（最大值）: 串联 VREF - 输入电压（最小值）: 分流电流（最大值）:60 mA 最大工作温度:+ 125 C 封装 / 箱体:SOT-23-3L 封装:Reel |
| REF5045-Q1 | 制造商:TI 制造商全称:Texas Instruments 功能描述:LOW NOISE, VERY LOW DRIFT,PRECISION VOLTAGE REFERENCE |
| REF5050 | 制造商:TI 制造商全称:Texas Instruments 功能描述:Low-Noise, Very Low Drift, Precision VOLTAGE REFERENCE |
| REF5050A | 制造商:TI 制造商全称:Texas Instruments 功能描述:Low-Noise, Very Low Drift, Precision VOLTAGE REFERENCE |
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