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| 型号： | ALD1722EPAL |
| 厂商： | Advanced Linear Devices Inc |
| 文件页数： | 6/13页 |
| 文件大小： | 0K |
| 描述： | IC OPAMP GP R-R CMOS 1.5MZ 8PDIP |
| 标准包装： | 50 |
| 系列： | EPAD® |
| 放大器类型： | 通用 |
| 电路数： | 1 |
| 输出类型： | 满摆幅 |
| 转换速率： | 2.8 V/µs |
| 增益带宽积： | 1.7MHz |
| 电流 - 输入偏压： | 0.01pA |
| 电压 - 输入偏移： | 25µV |
| 电流 - 电源： | 800µA |
| 电流 - 输出 / 通道： | 8mA |
| 电压 - 电源，单路/双路(±)： | 4 V ~ 10 V，±2 V ~ 5 V |
| 工作温度： | 0°C ~ 70°C |
| 安装类型： | 通孔 |
| 封装/外壳： | 8-DIP（0.300"，7.62mm） |
| 供应商设备封装： | 8-PDIP |
| 包装： | 管件 |
ALD1722E
Advanced Linear Devices
2 of 13
FUNCTIONAL DESCRIPTION
The ALD1722E uses EPADs as in-circuit elements for trim-
ming of offset voltage bias characteristics. Each ALD1722E
has a pair of EPAD-based circuits connected such that one
circuit is used to adjust VOS in one direction and the other
circuit is used to adjust VOS in the other direction. While each
of the EPAD devices is a monotonically adjustable program-
mable device, the VOS of the ALD1722E can be adjusted
many times in both directions. Once programmed, the set
VOS levels are stored permanently, even when the device
power is removed.
The ALD1722E is pre-programmed at the factory under
standard operating conditions for minimum equivalent input
offset voltage.
It also has a guaranteed offset voltage
program range, which is ideal for applications that require
electrical offset voltage programming.
The ALD1722E is an operational amplifier that can be
trimmed with user application-specific programming or in-
system programming conditions. User application-specific
circuit programming refers to the situation where the Total
Input Offset Voltage of the ALD1722E can be trimmed with
the actual intended operating conditions.
For example, an application circuit may have +6V and -2.5V
power supplies, and the operational amplifier input is biased
at +0.7V, and an average operating temperature at 55
°C.
The circuit can be wired up to these conditions within an
environmental chamber with the ALD1722E inserted into a
test socket connected to this circuit while it is being electri-
cally trimmed. Any error in VOS due to these bias conditions
can be automatically zeroed out. The Total VOS error is now
limited only by the adjustable range and the stability of VOS,
and the input noise voltage of the operational amplifier.
Therefore, this Total VOS error now includes VOS as VOS is
traditionally specified; plus the VOS error contributions from
PSRR, CMRR, TCVOS, and noise. Typically this total VOS
error term (VOST) is approximately ±25V for the ALD1722E.
The VOS contribution due to PSRR, CMRR, TCVOS and
external components can be large for operational amplifiers
without trimming. Therefore the ALD1722E with EPAD trim-
ming is able to provide much improved system performance
by reducing these other sources of error to provide signifi-
cantly reduced VOST.
In-System Programming refers to the condition where the
EPAD adjustment is made after the ALD1722E has been
inserted into a circuit board. In this case, the circuit design
must provide for the ALD1722E to operate in normal mode
and in programming mode. One of the benefits of in-system
programming is that not only is the ALD1722E offset voltage
from operating bias conditions accounted for, any residual
errors introduced by other circuit components, such as
resistor or sensor induced voltage errors, can also be cor-
rected. In this way, the “in-system” circuit output can be
adjusted to a desired level, eliminating the need for another
trimming function.
USER PROGRAMMABLE VOS FEATURE
Each ALD1722E has two pins named VE1 and VE2 which are
internally connected to an internal offset bias circuit. VE1/
VE2 have initial typical values of 1.6V. The voltage on these
pins can be programmed using the ALD E100 EPAD Pro-
grammer and the appropriate Adapter Module. The useful
programming range of VE1 and VE2 is 1.6V to 3.5V.
VE1 and VE2 pins are programming pins, used during
programming mode to inject charge into the internal EPADs.
Increasing voltage on VE1 decreases the offset voltage
whereas increasing voltage on VE2 increases the offset
voltage of the operational amplifier. The injected charge is
permanently stored and determines the offset voltage of the
operational amplifier.
After programming, VE1 and VE2
terminals must be left open to settle on a voltage determined
by internal bias currents.
During programming, the voltages on VE1 or VE2 are in-
creased incrementally to set the offset voltage of the opera-
tional amplifier to the desired Vos. Note that desired Vos can
be any value within the offset voltage programmable ranges,
and can be zero, a positive value or a negative value. This
VOS value can also be reprogrammed to a different value at
a later time, provided that the useful VE1 or VE2 program-
ming voltage range has not been exceeded. VE1 or VE2 pins
can also serve as capacitively coupled input pins.
Internally, VE1 and VE2 are programmed and connected
differentially.
Temperature drift effects between the two
internal offset bias circuits cancel each other and introduce
less net temperature drift coefficient change than offset
voltage trimming techniques such as offset adjustment with
an external trimmer potentiometer.
While programming, V+, VE1 and VE2 pins may be alter-
nately pulsed with 12V (approximately) pulses generated by
the EPAD Programmer. In-system programming requires
the ALD1722E application circuit to accommodate these
programming pulses. This can be accomplished by adding
resistors at certain appropriate circuit nodes.
For more
information, see Application Note AN1700.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ALD1722ESA | 制造商:ALD 制造商全称:Advanced Linear Devices 功能描述:EPAD⑩ OPERATIONAL AMPLIFIER |
| ALD1722ESAL | 功能描述:运算放大器 - 运放 EPAD(R) Hi-Precision RoHS:否 制造商:STMicroelectronics 通道数量:4 共模抑制比（最小值）:63 dB 输入补偿电压:1 mV 输入偏流（最大值）:10 pA 工作电源电压:2.7 V to 5.5 V 安装风格:SMD/SMT 封装 / 箱体:QFN-16 转换速度:0.89 V/us 关闭:No 输出电流:55 mA 最大工作温度:+ 125 C 封装:Reel |
| ALD1722GPAL | 功能描述:运算放大器 - 运放 CMOS OP Amp .01pA/25uV RoHS:否 制造商:STMicroelectronics 通道数量:4 共模抑制比（最小值）:63 dB 输入补偿电压:1 mV 输入偏流（最大值）:10 pA 工作电源电压:2.7 V to 5.5 V 安装风格:SMD/SMT 封装 / 箱体:QFN-16 转换速度:0.89 V/us 关闭:No 输出电流:55 mA 最大工作温度:+ 125 C 封装:Reel |
| ALD1722GSAL | 功能描述:运算放大器 - 运放 CMOS OP Amp .01pA/25uV RoHS:否 制造商:STMicroelectronics 通道数量:4 共模抑制比（最小值）:63 dB 输入补偿电压:1 mV 输入偏流（最大值）:10 pA 工作电源电压:2.7 V to 5.5 V 安装风格:SMD/SMT 封装 / 箱体:QFN-16 转换速度:0.89 V/us 关闭:No 输出电流:55 mA 最大工作温度:+ 125 C 封装:Reel |
| ALD1722PA | 功能描述:运算放大器 - 运放 5V High Precision RoHS:否 制造商:STMicroelectronics 通道数量:4 共模抑制比（最小值）:63 dB 输入补偿电压:1 mV 输入偏流（最大值）:10 pA 工作电源电压:2.7 V to 5.5 V 安装风格:SMD/SMT 封装 / 箱体:QFN-16 转换速度:0.89 V/us 关闭:No 输出电流:55 mA 最大工作温度:+ 125 C 封装:Reel |
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