参数资料
| 型号： | ISL28273FAZ-T7 |
| 厂商： | Intersil |
| 文件页数： | 8/18页 |
| 文件大小： | 0K |
| 描述： | IC OPAMP DUAL RRIO MCPWR 16-QSOP |
| 产品培训模块： | Solutions for Industrial Control Applications |
| 标准包装： | 1 |
| 放大器类型： | 仪表 |
| 电路数： | 2 |
| 输出类型： | 满摆幅 |
| 转换速率： | 0.6 V/µs |
| -3db带宽： | 265kHz |
| 电流 - 输入偏压： | 1nA |
| 电压 - 输入偏移： | 12µV |
| 电流 - 电源： | 120µA |
| 电流 - 输出 / 通道： | 29mA |
| 电压 - 电源，单路/双路(±)： | 2.5 V ~ 5.5 V，±1.25 V ~ 2.75 V |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-SSOP（0.154"，3.90mm 宽） |
| 供应商设备封装： | 16-QSOP |
| 包装： | 标准包装 |
| 产品目录页面： | 1235 (CN2011-ZH PDF) |
| 其它名称： | ISL28273FAZ-T7DKR |
16
FN6260.6
October 21, 2009
the in-amp maintains constant differential voltage across the
input terminals and feedback terminals (FB- - FB+) =
(IN+ - IN-), the transfer function of Figure 51 can be derived
from Equation 3. Note that the VREF gain term is eliminated,
and susceptibility to external noise is reduced.
A finite resistance RS in series with the VREF source, adds
an output offset of VIN*(RS/RG). As the series resistance RS
Figure 51. VOUT is simply shifted by an amount VREF.
External Resistor Mismatches
Because of the independent pair of feedback terminals
provided by the in-amps, the CMRR is not degraded by any
resistor mismatches. Hence, unlike a three op amp and
especially a two op amp in-amp realization, the ISL28270,
ISL28273 and ISL28470 reduce the cost of external
components by allowing the use of 1% or more tolerance
resistors without sacrificing CMRR performance. The CMRR
will be typically 110dB regardless of the tolerance of the
resistors used. Instead, a resistor mismatch results in a
higher deviation from the theoretical gain - gain error.
Gain Error and Accuracy
The gain error indicated in the “Electrical Specifications”
table on page 4 is the inherent gain error alone. The gain
error specification listed does not include the gain error
contributed by the resistors. There is an additional gain error
due to the tolerance of the resistors used. The resulting
non-ideal transfer function effectively becomes: (see
Equation 5)
Where:
ERG = Tolerance of RG
ERF = Tolerance of RF
EG = Gain Error of the ISL28270
The term [1 - (ERG +ERF +EG)] is the deviation from the
theoretical gain. Thus, (ERG +ERF +EG) is the total gain
error. For example, if 1% resistors are used, the total gain
error would be shown in Equation 6.
Disable/Power-Down
The ISL28270 and ISL28470 have an enable/disable pin for
each channel. They can be powered down to reduce the
supply current to typically 4A when all channels are off.
When disabled, the corresponding output is in a high
impedance state. The active low EN pin has an internal pull
down and hence can be left floating and the in-amp enabled
by default. When the EN is connected to an external logic,
the in-amp will shutdown when EN pin is pulled above 2V,
and will power up when EN bar is pulled below 0.8V.
Unused Channels
The ISL28270, ISL28273 and ISL28470 are dual and quad
channel op amps. If the application only requires one
channel when using the ISL28270, ISL28273 or less than 4
channels when using the ISL28470, the user must configure
the unused channel(s) to prevent them from oscillating. The
unused channel(s) will oscillate if the input and output pins
are floating. This will result in higher than expected supply
currents and possible noise injection into the channel being
used. The proper way to prevent this oscillation is to short
the IN+ and IN- terminals to ground and short the FB+, FB-
and the output terminals to ground as shown in Figure 52.
FIGURE 51. REFERENCE CONNECTION WITH AN AVAILABLE
VREF
+
-
+
-
IN+
IN-
FB+
FB-
V+
V-
2.4V TO 5.5V
RF
RG
VOUT
VCM
IN+
IN-
VREF
RS
(ISL28270, ISL28470)
VIN
IN+
IN-
–
=
(EQ. 3)
VOUT
1
R
S
R
F
+
R
G
----------------------
+
VREF
+
=
(EQ. 4)
VOUT
1
R
F
R
G
--------
+
VIN
()
VREF
()
+
=
VOUT
1
R
F
R
G
--------
+
1E
RG
E
RF
E
G
++
()
±
[] VIN
×
=
(EQ. 5)
TotalGainError
E
RG
E
RF
E
G typical
()
++
()
±
=
TotalGainError
0.01
0.005
++
()
2.5%
±
=
±
=
(EQ. 6)
FIGURE 52. PREVENTING OSCILLATIONS IN UNUSED
CHANNELS
-
+
1/2 ISL28270, ISL28273
1/4 ISL28470
-
+
IN+
IN-
FB+
FB-
ISL28270, ISL28273, ISL28470
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| ISL28273INEVAL1Z | 功能描述:EVALUATION BOARD FOR ISL28273 RoHS:是 类别:编程器，开发系统 >> 评估板 - 运算放大器 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:1 系列:- |
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| ISL28274FAZ-T13 | 制造商:Intersil Corporation 功能描述: |
| ISL28274FAZ-T7 | 功能描述:IC INSTR/OP AMP RRIO SGL 16-QSOP RoHS:是 类别:集成电路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 其它有关文件:Automotive Product Guide 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:1 系列:- 放大器类型:通用 电路数:1 输出类型:满摆幅 转换速率:3 V/µs 增益带宽积:10MHz -3db带宽:- 电流 - 输入偏压:1pA 电压 - 输入偏移:70µV 电流 - 电源:2.5mA 电流 - 输出 / 通道:48mA 电压 - 电源，单路/双路(±):2.7 V ~ 5.5 V，±1.35 V ~ 2.75 V 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:SOT-23-6 供应商设备封装:SOT-6 包装:Digi-Reel® 其它名称:MAX4475AUT#TG16DKR |
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