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参数资料
| 型号： | ADR280AKSZ-R2 |
| 厂商： | Analog Devices Inc |
| 文件页数： | 9/12页 |
| 文件大小： | 0K |
| 描述： | IC VREF SERIES PREC 1.2V SC-70-3 |
| 设计资源： | 4 mA-to-20 mA Loop-Powered Temperature Monitor Using ADuC7060/1 (CN0145) |
| 标准包装： | 250 |
| 基准类型： | 串联，精度 |
| 输出电压： | 1.2V |
| 容差： | ±0.4% |
| 温度系数： | 40ppm/°C |
| 输入电压： | 2.4 V ~ 5.5 V |
| 通道数： | 1 |
| 电流 - 静态： | 16µA |
| 电流 - 输出： | 100µA |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | SC-70，SOT-323 |
| 供应商设备封装： | SC-70-3 |
| 包装： | 带卷 (TR) |
ADR280
Boosted Current Source
Adding one more buffer to the previous circuit boosts the
current to the level that is limited only by the buffer U2 current
handling capability (see Figure 18).
U1
100 mA load is achievable at a 5 V supply. The higher the
supply voltage, the lower the current handling is because of the
heat generated on the MOSFET. For heavy capacitive loads,
additional buffering is needed at the output to enhance the
transient response.
5V
5V
V+
ADR280
V–
2.5V/100mA
V O
RL
25 ?
M1*
5V
U1
V+
ADR280
V–
U2
V+
V–
V OUT
C1
0.1μF
R2
10.8k ? ± 0.1%
C2
1pF
U2
+
V+
AD8541
V– –
V REF
1.2V
V OUT
C1
0.1μF
+
R SET
230 ?
RL
500 ?
+
1.2V
–
I L
5mA
5V
– U3
V+
V–
I L = 1.2V/R SET
U2 = U3 = AD8542, AD822
R1 *M1 = FDB301N, 2N7000, 2N7002, OR EQUIVALENT.
10k ? ± 0.1%
Figure 20. 2.5 V Boosted Reference
GSM and 3G Mobile Station Applications
Figure 18. Precision Current Source
Negative Reference
A negative reference can be precisely configured without using
The voltage difference between V OUT and V? is 1.2 V. Since V OUT
is at virtual ground, U2 closes the loop by forcing the V? pin to
be the negative reference output.
U1
The ADR280 voltage reference is ideal for use with analog
baseband ICs in GSM and 3G mobile station applications.
GSM analog baseband. The AD6535 provides all of the data
converters and power management functions needed to
implement a GSM mobile station, including baseband codecs,
audio codecs, voltage regulators, and a battery charger. Besides
low current consumption and a small footprint, the ADR280 is
+5V
V+
ADR280
optimized for excellent PSRR, which is necessary for optimum
AD6535 device performance when the main battery voltage
fluctuates during RF power amplifier activity.
V–
–V REF
–1.2V
DIGITAL
BASEBAND
AD6535
ANALOG BASEBAND
RADIO
V OUT
C1
0.1μF
U2
BASEBAND CODEC
V+
–
AD8541
AUDIO CODEC
+
V–
–2.7V
Figure 19. Negative Reference
Boosted Reference with Scalable Output
A precision user defined output with boosted current capability
can be implemented with the circuit shown in Figure 20. In this
circuit, U2 forces V O to be equal to V REF × (1 + R2/R1) by regu-
lating the turn-on of M1; the load current is therefore furnished
by the 5 V supply. For higher output voltage, U2 must be changed
and the supply voltage of M1 and U2 must also be elevated and
separated from the U1 input voltage. In this configuration, a
Rev. C | Page 9 of 12
POWER
MANAGEMENT
ADR280
VOLTAGE REFERENCE
Figure 21. GSM Mobile Station Application
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ADR280AKSZ-R21 | 制造商:AD 制造商全称:Analog Devices 功能描述:1.2 V Ultralow Power High PSRR Voltage Reference |
| ADR280AKSZ-REEL7 | 功能描述:IC VREF SERIES PREC 1.2V SC-70-3 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 |
| ADR280AKSZ-REEL71 | 制造商:AD 制造商全称:Analog Devices 功能描述:1.2 V Ultralow Power High PSRR Voltage Reference |
| ADR280ART-R2 | 功能描述:IC VREF SERIES PREC 1.2V SOT23-3 RoHS:否 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:5V 容差:±0.5% 温度系数:100ppm/°C 输入电压:- 通道数:1 电流 - 阴极:80µA 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:TO-236-3，SC-59，SOT-23-3 供应商设备封装:SOT-23-3 包装:带卷 (TR) 其它名称:LM4040CIM3-5.0MLTRLM4040CIM3-5.0MLTR-ND |
| ADR280ART-REEL | 制造商:Analog Devices 功能描述: |
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