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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： | 2/27页 |
| 文件大小： | 976K |
| 代理商： | REF5045IDGKT |
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R5
60kW
REF50xx
TEMP
V
OUT
GND
TRIM/NR
V
IN
aT
(10 A
m
at+25 C)
°
R2
R1
R3
R4
10kW
1kW
1.2V
DNC
TEMP
V
OUT
V
IN
GND
DNC
NC
TRIM/NR
REF50xx
+V
SUPPLY
10kW
1kW
470kW
DNC
TEMP
V
OUT
V
IN
GND
DNC
NC
TRIM/NR
REF50xx
C
BYPASS
1 Fto10 F
m
C
L
1 Fto50 F
m
+V
SUPPLY
V
OUT
DNC
TEMP
V
OUT
V
IN
GND
DNC
NC
TRIM/NR
REF50xx
C1
1 F
m
+V
SUPPLY
SBOS410E – JUNE 2007 – REVISED JUNE 2010
www.ti.com
APPLICATION INFORMATION
The REF50xx is family of low-noise, precision
requirement
of
2.7V,
these
references
can
be
bandgap voltage references that are specifically
operated with a supply of 200mV above the output
designed for excellent initial voltage accuracy and
voltage
in
an
unloaded
condition.
For
loaded
drift. Figure 28 shows a simplified block diagram of
conditions, a typical dropout voltage versus load plot
the REF50xx.
is shown in Figure 6 of the Typical Characteristics.
OUTPUT ADJUSTMENT USING THE TRIM/NR
PIN
The
REF50xx
provides
a
very
accurate,
factory-trimmed voltage output. However, VOUT can
be adjusted using the trim and noise reduction pin
(TRIM/NR, pin 5). Figure 30 shows a typical circuit
that allows an output adjustment of ±15mV
Figure 28. REF50xx Simplified Block Diagram
BASIC CONNECTIONS
Figure 30. VOUT Adjustment Using the TRIM/NR
Figure 29 shows the typical connections for the
Pin
REF50xx.
A
supply
bypass
capacitor
ranging
between 1mF to 10mF is recommended. A 1mF to
The REF50xx allows access to the bandgap through
50mF output capacitor (CL) must be connected from
the TRIM/NR pin. Placing a capacitor from the
VOUT to GND. The ESR value of CL must be less than
TRIM/NR pin to GND (see Figure 31) in combination
or equal to 1.5
to ensure output stability. To
with the internal R3 and R4 resistors creates a
minimize noise, the recommended ESR of CL is
low-pass filter. A capacitance of 1mF creates a
between 1
and 1.5.
low-pass filter with the corner frequency between
10Hz and 20Hz. Such a filter decreases the overall
noise measured on the VOUT pin by half. Higher
capacitance results in a lower filter cutoff frequency,
further reducing output noise. Note that use of this
capacitor increases startup time.
Figure 29. Basic Connections
SUPPLY VOLTAGE
The REF50xx family of voltage references features
extremely low dropout voltage. With the exception of
Figure 31. Noise Reduction Using the TRIM/NR
the
REF5020,
which
has
a
minimum
supply
Pin
10
Copyright 2007–2010, Texas Instruments Incorporated
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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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