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| 型号： | DS4303R+T&R |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 7/8页 |
| 文件大小： | 0K |
| 描述： | IC VREF SERIES ADJ SOT-23-5 |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 3,000 |
| 基准类型： | 系列，可调式 |
| 输出电压： | 0.3 V ~ 3.3 V |
| 容差： | ±0.03% |
| 温度系数： | 62ppm/°C |
| 输入电压： | 2.4 V ~ 3.6 V |
| 通道数： | 1 |
| 电流 - 静态： | 1.6mA |
| 电流 - 输出： | 1mA（最小值） |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | SC-74A，SOT-753 |
| 供应商设备封装： | SOT-23-5 |
| 包装： | 带卷 (TR) |
Electronically Programmable
Voltage Reference
AUTOMATED TEST EQUIPMENT
DEVICE UNDER TEST (DUT)
DS4303
2.4V TO 3.6V
STEP 1:
SET REFERENCE
VOLTAGE
DIGITALLY
CONTROLLED
VOLTAGE SOURCE
V IN
EEPROM
VOLTAGE
V CC
STEP 2:
TOGGLE ADJ
DIGITAL PIN DRIVER
ADJ
GND
SAMPLE AND
INFINITE
HOLD
V OUT
BED-OF-NAILS
STEP 3:
DETERMINE IF
THE REFERENCE
DIGITALLY
CONTROLLED
TEST
ACCESS
PARAMETER MEASURED
DURING CALIBRATION
CIRCUITRY
REQUIRING
VOLTAGE
ADJUSTMENT
VOLTAGE NEEDS
ADJUSTMENT
Figure 2. Application Circuit
MEASUREMENT
During the V OUT self-adjust period, the DS4303 inter-
nally adjusts the onboard DAC until V OUT matches V IN .
After V OUT has stabilized to within the tracking accura-
cy, V OUTTA , of V IN , it will be automatically stored in
EEPROM. The storage period lasts for the duration of
the EEPROM write time, t W . After the first adjustment
procedure has completed, V OUT can be measured,
and if necessary V IN can be readjusted and the entire
adjustment procedure can be repeated to fine-tune
V OUT within the V OUTQ range.
Following each self-adjust procedure, V OUT is saved
indefinitely, even if the DS4303 is power cycled.
Automated Programming Procedure
Figure 2 details an example of how the DS4303 can be
adjusted in an application. During factory alignment, a
three/four-node bed-of-nails is used to: (1) provide the
adjustment voltage through the V IN pin, (2) control the
ADJ input, and (3) sense the needed feedback para-
meter. During manufacture, an automated test proce-
dure adjusts V OUT, by changing V IN , until the feedback
parameter is optimized. After the bed-of-nails operation
is complete, both the V IN and ADJ inputs are left open
circuit. V OUT can be readjusted at any time by following
the same procedure. The closed-loop nature of the
adjustment process removes all the system inaccura-
cies such as resistor tolerances, amplifier offsets, gain
mismatches, and even the inaccuracies in the automat-
ed equipment that provides the reference voltage.
Typical Operating Circuit
The typical operating circuit shows an example of how
the DS4303 can replace most existing calibration solu-
tions. Many power supplies use a shunt voltage refer-
ence to provide the internal reference voltage, and
fine-tune adjustments are often made with hand-select-
ed discrete resistors. The DS4303 replaces this cum-
bersome arrangement with a solution that is capable of
being adjusted by automated techniques. An additional
benefit of the DS4303 is the ability to provide a much
lower voltage (down to 300mV) than is possible with
shunt voltage references. Another benefit of the
DS4303 is the ability to be adjusted after the unit has
been fully assembled and tested, resulting in a much
more flexible manufacturing arrangement, lower inven-
tory costs, and a quicker time-to-market.
_____________________________________________________________________
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相关代理商/技术参数 |
参数描述 |
|---|---|
| DS4303R-U | 功能描述:基准电压& 基准电流 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 |
| DS4303R-U+ | 功能描述:基准电压& 基准电流 Electronically Programmable 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 |
| DS4304FP000 | 制造商:Thomas & Betts 功能描述:400A,CON,3P4W,MG,304,277/480V |
| DS4304MP000 | 制造商:Thomas & Betts 功能描述:400A,PLG,3P4W,MG,304,277/480V |
| DS4304MP00K | 制造商:Thomas & Betts 功能描述:RS DS4304MP00K 400A, PLG, 3P4W,304, |
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