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参数资料
| 型号： | ISL21009 |
| 厂商： | Intersil Corporation |
| 英文描述： | High Voltage Input Precision, Low Noise FGA Voltage References(高电压输入精度，低噪声FGA电压基准) |
| 中文描述： | 高电压输入高精度，低噪声FGA中电压基准（高电压输入精度，低噪声FGA中电压基准） |
| 文件页数： | 16/19页 |
| 文件大小： | 640K |
| 代理商： | ISL21009 |
16
FN6327.6
September 12, 2007
Data Converters in particular can utilize the ISL21009 as an
external voltage reference. Low power DAC and ADC
circuits will realize maximum resolution with lowest noise.
Board Mounting Considerations
For applications requiring the highest accuracy, board
mounting location should be reviewed. The device uses a
plastic SOIC package, which will subject the die to mild
stresses when the PC board is heated and cooled, slightly
changing the shape. Placing the device in areas subject to
slight twisting can cause degradation of the accuracy of the
reference voltage due to these die stresses. It is normally
best to place the device near the edge of a board, or the
shortest side, as the axis of bending is most limited at that
location. Mounting the device in a cutout also minimizes flex.
Obviously mounting the device on flexprint or extremely thin
PC material will likewise cause loss of reference accuracy.
Noise Performance and Reduction
The output noise voltage in a 0.1Hz to 10Hz bandwidth is
typically 4.5μV
P-P
. The noise measurement is made with a
bandpass filter made of a 1-pole high-pass filter with a corner
frequency at 0.1Hz and a 2-pole low-pass filter with a corner
frequency at 12.6Hz to create a filter with a 9.9Hz bandwidth.
Noise in the 10kHz to 1MHz bandwidth is approximately
40μV
P-P
with no capacitance on the output. This noise
measurement is made with a 2 decade bandpass filter made
of a 1-pole high-pass filter with a corner frequency at 1/10 of
the center frequency and 1-pole low-pass filter with a corner
frequency at 10x the center frequency. Load capacitance up
to 1000pF can be added but will result in only marginal
improvements in output noise and transient response. The
output stage of the ISL21009 is not designed to drive heavily
capactive loads, so for load capacitances above 0.001μF, the
noise reduction network shown in Figure 58 is recommended.
This network reduces noise significantly over the full
bandwidth. Noise is reduced to less than 20μV
P-P
from 1Hz to
1MHz using this network with a 0.01μF capacitor and a 2k
Ω
resistor in series with a 10μF capacitor. Also, transient
response is improved with higher value output capacitor. The
0.01μF value can be increased for better load transient
response with little sacrifice in output stability.
.
Turn-On Time
The ISL21009 devices have low supply current and thus the
time to bias up internal circuitry to final values will be longer
than with higher power references. Normal turn-on time is
typically 100μs. This is shown in Figure 25. Circuit design
must take this into account when looking at power-up delays
or sequencing.
Temperature Coefficient
The limits stated for temperature coefficient (tempco) are
governed by the method of measurement. The overwhelming
standard for specifying the temperature drift of a reference is to
measure the reference voltage at two temperatures, take the
total variation, (V
HIGH
– V
LOW
), and divide by the temperature
extremes of measurement (T
HIGH
– T
LOW
). The result is
divided by the nominal reference voltage (at T = +25°C) and
multiplied by 10
6
to yield ppm/°C. This is the “Box” method for
specifying temperature coefficient.
Output Voltage Adjustment
The output voltage can be adjusted up or down by 2.5% by
placing a potentiometer from V
OUT
to GND and connecting the
wiper to the TRIM pin. The TRIM input is high impedance so no
series resistance is needed. The resistor in the potentiometer
should be a low tempco (<50ppm/°C) and the resulting voltage
divider should have very low tempco <5ppm/°C. A digital
potentiometer such as the ISL95810 provides a low tempco
resistance and excellent resistor and tempco matching for trim
applications.
V
IN
= 5.0V
V
IN
V
O
GND
ISL21009-25
0.01μF
10μF
2k
Ω
0.1μF
10μF
FIGURE 58. HANDLING HIGH LOAD CAPACITANCE
ISL21009
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PDF描述 |
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ISL21009_0709 | 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:High Voltage Input Precision, Low Noise FGA⑩ Voltage References |
| ISL21009_09 | 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:High Voltage Input Precision, Low Noise FGAa?￠ Voltage References |
| ISL21009BFB50ZR5314 | 功能描述:基准电压& 基准电流 10MA LOAD 5 0VFEREN I/A=+/-0 5MV 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 |
| ISL21009BFB50ZR5314T | 功能描述:基准电压& 基准电流 PBFREE 10MA LOAD 5 0VFERENCE I/A=+/-0 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 |
| ISL21009BFB812Z | 功能描述:基准电压& 基准电流 25VFERENCE I/A=+/-0 T/C=3PPM -40 TO +125 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 |
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