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| 型号： | LTC1992CMS8#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 20/42页 |
| 文件大小： | 0K |
| 描述： | IC AMP/DVR I/O FULLY DIFF 8-MSOP |
| 标准包装： | 50 |
| 放大器类型： | 差分 |
| 电路数： | 1 |
| 输出类型： | 差分，满摆幅 |
| 转换速率： | 1.5 V/µs |
| 增益带宽积： | 3.2MHz |
| 电流 - 输入偏压： | 2pA |
| 电压 - 输入偏移： | 250µV |
| 电流 - 电源： | 700µA |
| 电流 - 输出 / 通道： | 30mA |
| 电压 - 电源，单路/双路(±)： | 2.7 V ~ 11 V，±1.35 V ~ 5.5 V |
| 工作温度： | 0°C ~ 70°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-TSSOP，8-MSOP（0.118"，3.00mm 宽） |
| 供应商设备封装： | 8-MSOP |
| 包装： | 管件 |
| 产品目录页面： | 1323 (CN2011-ZH PDF) |
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LTC1992 Family
27
1992fb
APPLICATIONS INFORMATION
negative feedback and using an op amp’s differential input
to create the servo’s summing junction.
One servo controls the signal gain path. The differential
input of op amp A1 creates the summing junction of this
servo. Any voltage present at the input of A1 is amplified (by
the op amp’s large open-loop gain), sent to the summing
blocks and then onto the outputs. Taking note of the signs on
the summing blocks, op amp A1’s output moves +OUT and
–OUT in opposite directions. Applying a voltage step at
the INM node increases the +OUT voltage while the –OUT
voltage decreases. The RFB resistors connect the outputs
to the appropriate inputs establishing negative feedback and
closing the servo’s loop. Any servo loop always attempts
to drive its error voltage to zero. In this servo, the error
voltage is the voltage between the INM and INP nodes,
thus A1 will force the voltages on the INP and INM nodes
to be equal (within the part’s DC offset, open loop gain
and bandwidth limits). The “virtual short” between the
two inputs is conceptually the same as that for op amps
and is critical to understanding fully differential amplifier
applications.
The other servo controls the output common mode level.
The differential input of op amp A2 creates the summing
junction of this servo. Similar to the signal gain servo
above, any voltage present at the input of A2 is amplified,
sent to the summing blocks and then onto the outputs.
However, in this case, both outputs move in the same direc-
tion. The resistors RCMP and RCMM connect the +OUT and
–OUT outputs to A2’s inverting input establishing negative
feedback and closing the servo’s loop. The midpoint of
resistors RCMP and RCMM derives the output’s common
mode level (i.e., its average). This measure of the output’s
common mode level connects to A2’s inverting input while
A2’s noninverting input connects directly to the VOCM pin.
A2 forces the voltages on its inverting and noninverting
inputs to be equal. In other words, it forces the output
common mode voltage to be equal to the voltage on the
VOCM input pin.
For any fully differential amplifier application to function
properly both the signal gain servo and the common mode
level servo must be satisfied. When analyzing an applica-
tions circuit, the INP node voltage must equal the INM node
voltage and the output common mode voltage must equal
the VOCM voltage. If either of these servos is taken out of
the specified areas of operation (e.g., inputs taken beyond
the common mode range specifications, outputs hitting the
supply rails or input signals varying faster than the part
can track), the circuit will not function properly.
Fully Differential Amplifier Signal Conventions
Fully differential amplifiers have a multitude of signals and
signal ranges to consider. To maintain proper operation
with conventional op amps, the op amp’s inputs and its
output must not hit the supply rails and the input signal’s
common mode level must also be within the part’s speci-
fied limits. These considerations also apply to fully dif-
ferential amplifiers, but here there is an additional output
to consider and common mode level shifting complicates
matters. Figure 3 provides a list of the many signals and
specifications as well as the naming convention. The
phrase “common mode” appears in many places and often
leads to confusion. The fully differential amplifier’s ability
to uncouple input and output common mode levels yields
great design flexibility, but also complicates matters some.
For simplicity, the equations in Figure 3 also assume an
ideal amplifier and perfect resistor matching. For a detailed
analysis, consult the fully differential amplifier applications
circuit analysis section.
Basic Applications Circuits
Most fully differential amplifier applications circuits employ
symmetrical feedback networks and are familiar territory
for op amp users. Symmetrical feedback networks require
that the –VIN/+VOUT network is a mirror image duplicate of
the +VIN/–VOUT network. Each of these half circuits is basi-
cally just a standard inverting gain op amp circuit. Figure 4
shows three basic inverting gain op amp circuits and their
corresponding fully differential amplifier cousins. The vast
majority of fully differential amplifier circuits derive from
old tried and true inverting op amp circuits. To create a
fully differential amplifier circuit from an inverting op amp
circuit, first simply transfer the op amp’s VIN/VOUT network
to the fully differential amplifier’s –VIN/+VOUT nodes. Then,
take a mirror image duplicate of the network and apply it
to the fully differential amplifier’s +VIN/–VOUT nodes. Op
amp users can comfortably transfer any inverting op amp
circuit to a fully differential amplifier in this manner.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC1992HMS8 | 功能描述:IC AMP DIFF I/O ADJ OUT 8-MSOP RoHS:否 类别:集成电路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 标准包装:1 系列:- 放大器类型:通用 电路数:4 输出类型:满摆幅 转换速率:0.6 V/µs 增益带宽积:1MHz -3db带宽:- 电流 - 输入偏压:2pA 电压 - 输入偏移:1000µV 电流 - 电源:85µA 电流 - 输出 / 通道:20mA 电压 - 电源，单路/双路(±):1.8 V ~ 6 V 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:14-SOIC（0.154"，3.90mm 宽） 供应商设备封装:14-SOICN 包装:剪切带 (CT) 产品目录页面:680 (CN2011-ZH PDF) 其它名称:MCP6L04T-E/SLCT |
| LTC1992HMS8#PBF | 功能描述:IC AMP/DVR I/O FULLY DIFF 8-MSOP RoHS:是 类别:集成电路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 产品培训模块:Differential Circuit Design Techniques for Communication Applications 标准包装:1 系列:- 放大器类型:RF/IF 差分 电路数:1 输出类型:差分 转换速率:9800 V/µs 增益带宽积:- -3db带宽:2.9GHz 电流 - 输入偏压:3µA 电压 - 输入偏移:- 电流 - 电源:40mA 电流 - 输出 / 通道:- 电压 - 电源，单路/双路(±):3 V ~ 3.6 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:16-VQFN 裸露焊盘，CSP 供应商设备封装:16-LFCSP-VQ 包装:剪切带 (CT) 产品目录页面:551 (CN2011-ZH PDF) 其它名称:ADL5561ACPZ-R7CT |
| LTC1992HMS8#TR | 功能描述:IC AMP DIFF I/O ADJ OUT 8-MSOP RoHS:否 类别:集成电路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 标准包装:1 系列:- 放大器类型:通用 电路数:4 输出类型:满摆幅 转换速率:0.6 V/µs 增益带宽积:1MHz -3db带宽:- 电流 - 输入偏压:2pA 电压 - 输入偏移:1000µV 电流 - 电源:85µA 电流 - 输出 / 通道:20mA 电压 - 电源，单路/双路(±):1.8 V ~ 6 V 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:14-SOIC（0.154"，3.90mm 宽） 供应商设备封装:14-SOICN 包装:剪切带 (CT) 产品目录页面:680 (CN2011-ZH PDF) 其它名称:MCP6L04T-E/SLCT |
| LTC1992HMS8#TRPBF | 功能描述:IC AMP/DVR I/O FULLY DIFF 8-MSOP RoHS:是 类别:集成电路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 标准包装:1 系列:- 放大器类型:通用 电路数:4 输出类型:满摆幅 转换速率:0.6 V/µs 增益带宽积:1MHz -3db带宽:- 电流 - 输入偏压:2pA 电压 - 输入偏移:1000µV 电流 - 电源:85µA 电流 - 输出 / 通道:20mA 电压 - 电源，单路/双路(±):1.8 V ~ 6 V 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:14-SOIC（0.154"，3.90mm 宽） 供应商设备封装:14-SOICN 包装:剪切带 (CT) 产品目录页面:680 (CN2011-ZH PDF) 其它名称:MCP6L04T-E/SLCT |
| LTC1992IMS8 | 功能描述:IC AMP DIFF I/O ADJ OUT 8-MSOP RoHS:否 类别:集成电路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 标准包装:1 系列:- 放大器类型:通用 电路数:4 输出类型:满摆幅 转换速率:0.6 V/µs 增益带宽积:1MHz -3db带宽:- 电流 - 输入偏压:2pA 电压 - 输入偏移:1000µV 电流 - 电源:85µA 电流 - 输出 / 通道:20mA 电压 - 电源，单路/双路(±):1.8 V ~ 6 V 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:14-SOIC（0.154"，3.90mm 宽） 供应商设备封装:14-SOICN 包装:剪切带 (CT) 产品目录页面:680 (CN2011-ZH PDF) 其它名称:MCP6L04T-E/SLCT |
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