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| 型号： | ALD1722EDA |
| 厂商： | Advanced Linear Devices, Inc. |
| 英文描述： | EPAD⑩ OPERATIONAL AMPLIFIER |
| 中文描述： | EPAD⑩运算放大器 |
| 文件页数： | 3/10页 |
| 文件大小： | 64K |
| 代理商： | ALD1722EDA |
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Advanced Linear Devices
ALD1722E/ALD1722
FUNCTIONAL DESCRIPTION
The ALD1722E/ALD1722 uses EPADs as in-circuit ele-
ments for trimming of offset voltage bias characteristics.
Each ALD1722E/ALD1722 has a pair of EPAD-based cir-
cuits connected such that one circuit is used to adjust VOS
in one direction and the other is used to adjust VOS in the
other direction.
Functional Description of ALD1722E
While each of the EPAD devices is a monotonically adjust-
able programmable device, the VOS of the ALD1722E can
be adjusted many times in both directions. Once pro-
grammed, the set VOS levels are stored permanently, even
when the device power is removed.
The ALD1722E provides the user with an operational ampli-
fier that can be trimmed with user application-specific pro-
gramming or in-system programming conditions. User appli-
cation-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.
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.
For example, an application circuit may have +6V and -2.5V
power supplies, and the operational amplifier input is biased
at +0.7V, and the average operating temperature is at 55
°C.
The circuit can be wired up to these conditions within an
environmental chamber, and the ALD1722E can be inserted
into a test socket connected to this circuit while it is being
electrically 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 contribu-
tions 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 other trimming com-
ponents.
USER PROGRAMMABLE Vos FEATURE
Each ALD1722E/ALD1722 has two pins named VE1 and
VE2 which are internally connected to an internal offset bias
circuit. VE1/VE2 have initial typical values of 1.6 Volt. The
voltage on these pins can be programmed using the ALD
E100 EPAD Programmer and the appropriate Adapter Mod-
ule. The useful programming range of VE1 and VE2 is 1.6
Volt to 3.5 Volts. VE1 and VE2 pins are programming pins,
used during programming mode. The Programming pin is
used during electrical programming to inject charge into the
internal EPADs. Increases of VE1 decrease the offset volt-
age while increases of VE2 increase 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
increased incrementally to set the offset voltage of the
operational amplifier to the desired VOS. Note that desired
VOS can be any value within the offset voltage program-
mable ranges, and can be either 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 programming 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/ALD1722 application circuit to accommo-
date these programming pulses. This can be accomplished
by adding resistors at certain appropriate circuit nodes. For
more information, see Application Note AN1700.
Functional Description of ALD1722
The ALD1722 is pre-programmed at the factory under stan-
dard operating conditions for minimum equivalent input off-
set voltage.
The ALD1722 offers similar programmable
features as the ALD1722E, but with more limited offset
voltage program range. It is intended for standard opera-
tional amplifier applications where little or no electrical pro-
gramming by the user is necessary.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ALD1722EPA | 功能描述:运算放大器 - 运放 Precision LP 300mV 4000pF 0.01pA 1.5MHz 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 |
| ALD1722EPAL | 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 |
| 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 |
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