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| 型号： | LTC1992-2IMS8#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 30/42页 |
| 文件大小： | 0K |
| 描述： | IC AMP/DVR I/O GAIN-2 DIFF 8MSOP |
| 标准包装： | 2,500 |
| 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： | -40°C ~ 85°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： | 带卷 (TR) |
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LTC1992 Family
36
1992fb
APPLICATIONS INFORMATION
quantifies the undesired effect of signal level shifting
discussed earlier in the Signal Level Shifting section.
Asymmetrical Feedback Application Circuits
The basic signal equation in Figure 6 also gives insight
to another piece of intuition. The feedback factors may
be deliberately set to different values. One interesting
class of these application circuits sets one or both of the
feedback factors to the extreme values of either zero or
one. Figure 7 shows three such circuits.
At first these application circuits may look to be unstable
or open loop. It is the common mode feedback loop that
enables these circuits to function. While they are useful
circuits, they have some shortcomings that must be con-
sidered. First, due to the severe feedback factor asymmetry,
the VOCM level influences the differential output voltage
with about the same strength as the input signal. With
this much gain in the VOCM path, differential output offset
and noise increase. The large VOCM to VOUTDIFF gain also
necessitates that these circuits are largely limited to dual,
split supply voltage applications with a ground referenced
input signal and a grounded VOCM pin.
The top application circuit in Figure 7 yields a high input
impedance, precision gain of 2 block without any external
resistors. The on-chip common mode feedback servo
resistors determine the gain precision (better than 0.1
percent). By using the –VOUT output alone, this circuit is
also useful to get a precision, single-ended output, high
input impedance inverter. To intuitively understand this
circuit, consider it as a standard op amp voltage follower
(delivered through the signal gain servo) with a comple-
mentary output (delivered through the common mode level
servo). As usual, the amplifier’s input common mode range
must not be exceeded. As with a standard op amp voltage
follower, the common mode signal seen at the amplifier’s
input is the input signal itself. This condition limits the
input signal swing, as well as the output signal swing, to
be the input signal common mode range specification.
The middle circuit is largely the same as the first except
that the noninverting amplifier path has gain. Note that
Figure 6. Basic Equations for Mismatched or Asymmetrical Feedback Applications Circuits
–
+
RIN2
RIN1
2[+VIN (1 – 1) – (–VIN) (1 – 2)] + 2VOSDIFF + 2VOUTCM ( 1 – 2)
1 + 2
RFB1
VOCM
VOUTDIFF =
WHERE:
FOR GROUND REFERENCED, SINGLE-ENDED INPUT SIGNAL, LET +VIN = VINSIG AND –VIN = 0V
RFB2
–VIN
VINDIFF
+VIN – –VIN
+VIN
–VOUT
+VOUT
1992 F06
LTC1992
VOUTDIFF
+VOUT – –VOUT
2 VINSIG (1 – 1) + 2VOSDIFF + 2VOUTCM ( 1 – 2)
1 + 2
VOUTDIFF =
COMMON MODE REJECTION: SET +VIN = –VIN = VINCM, VOSDIFF = 0V, VOUTCM = 0V
ΔVINCM
ΔVOUTDIFF
CMRR =
= 2
; OUTPUT REFERRED
1 + 2
2 – 1
1 + 2
OUTPUT DC OFFSET VOLTAGE: SET +VIN = –VIN = VINCM
VOSDIFFOUT = VOSDIFF
+ (VOUTCM – VINCM) 2
2
1 + 2
RIN1
RIN1 + RFB1
1 =
; 2 =
; VOSDIFF = AMPLIFIER INPUT REFERRED OFFSET VOLTAGE
VOUTCM = KCM VOCM + VOSCM
0.999 < KCM < 1.001
RIN2
RIN2 + RFB2
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| LTC1992-5CMS8 | 功能描述:IC AMP/DVR DIFF I/O GAIN-5 8MSOP RoHS:否 类别:集成电路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 标准包装:73 系列:Over-The-Top® 放大器类型:通用 电路数:4 输出类型:满摆幅 转换速率:0.07 V/µs 增益带宽积:200kHz -3db带宽:- 电流 - 输入偏压:1nA 电压 - 输入偏移:285µV 电流 - 电源:50µA 电流 - 输出 / 通道:25mA 电压 - 电源，单路/双路(±):2 V ~ 44 V，±1 V ~ 22 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:16-WFDFN 裸露焊盘 供应商设备封装:16-DFN-EP（5x3） 包装:管件 |
| LTC1992-5CMS8#PBF | 功能描述:IC AMP/DVR I/O GAIN-5 DIFF 8MSOP RoHS:是 类别:集成电路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 标准包装:73 系列:Over-The-Top® 放大器类型:通用 电路数:4 输出类型:满摆幅 转换速率:0.07 V/µs 增益带宽积:200kHz -3db带宽:- 电流 - 输入偏压:1nA 电压 - 输入偏移:285µV 电流 - 电源:50µA 电流 - 输出 / 通道:25mA 电压 - 电源，单路/双路(±):2 V ~ 44 V，±1 V ~ 22 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:16-WFDFN 裸露焊盘 供应商设备封装:16-DFN-EP（5x3） 包装:管件 |
| LTC1992-5CMS8#TR | 功能描述:IC AMP/DVR DIFF I/O GAIN-5 8MSOP RoHS:否 类别:集成电路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 标准包装:73 系列:Over-The-Top® 放大器类型:通用 电路数:4 输出类型:满摆幅 转换速率:0.07 V/µs 增益带宽积:200kHz -3db带宽:- 电流 - 输入偏压:1nA 电压 - 输入偏移:285µV 电流 - 电源:50µA 电流 - 输出 / 通道:25mA 电压 - 电源，单路/双路(±):2 V ~ 44 V，±1 V ~ 22 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:16-WFDFN 裸露焊盘 供应商设备封装:16-DFN-EP（5x3） 包装:管件 |
| LTC1992-5CMS8#TRPBF | 功能描述:IC AMP/DVR I/O GAIN-5 DIFF 8MSOP RoHS:否 类别:集成电路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 标准包装:73 系列:Over-The-Top® 放大器类型:通用 电路数:4 输出类型:满摆幅 转换速率:0.07 V/µs 增益带宽积:200kHz -3db带宽:- 电流 - 输入偏压:1nA 电压 - 输入偏移:285µV 电流 - 电源:50µA 电流 - 输出 / 通道:25mA 电压 - 电源，单路/双路(±):2 V ~ 44 V，±1 V ~ 22 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:16-WFDFN 裸露焊盘 供应商设备封装:16-DFN-EP（5x3） 包装:管件 |
| LTC1992-5HMS8 | 功能描述:IC AMP/DVR DIFF I/O GAIN-5 8MSOP RoHS:否 类别:集成电路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 标准包装:150 系列:- 放大器类型:音频 电路数:2 输出类型:- 转换速率:5 V/µs 增益带宽积:12MHz -3db带宽:- 电流 - 输入偏压:100nA 电压 - 输入偏移:500µV 电流 - 电源:6mA 电流 - 输出 / 通道:50mA 电压 - 电源，单路/双路(±):4 V ~ 32 V，±2 V ~ 16 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:8-TSSOP（0.173"，4.40mm 宽） 供应商设备封装:8-TSSOP 包装:管件 |
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