参数资料
| 型号： | LT1187CN8 |
| 厂商： | Linear Technology |
| 文件页数： | 15/16页 |
| 文件大小： | 0K |
| 描述： | IC AMP VIDEO DIFFRNC ADJ 8-DIP |
| 标准包装： | 50 |
| 应用： | 差分 |
| 电路数： | 1 |
| -3db带宽： | 50MHz |
| 转换速率： | 165 V/µs |
| 电流 - 电源： | 13mA |
| 电流 - 输出 / 通道： | 20mA |
| 电压 - 电源，单路/双路(±)： | 4.75 V ~ 16 V，±2.38 V ~ 8 V |
| 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 |
LT1187
8
1187fa
APPLICATIONS INFORMATION
The primary use of the LT1187 is in converting high speed
differential signals to a single-ended output. The LT1187
video difference amplier has two uncommitted high
input impedance (+) and (–) inputs. The amplier has
another set of inputs which can be used for reference and
feedback. Additionally, this set of inputs give gain adjust
and DC control to the difference amplier. The voltage
gain of the LT1187 is set like a conventional operational
amplier. Feedback is applied to Pin 8, and it is optimized
for gains of 2 or greater. The amplier can be operated
single-ended by connecting either the (+) or (–) inputs to
the +/REF (Pin 1). The voltage gain is set by the resistors:
(RFB + RG)/RG.
Like the single-ended case, the differential voltage gain is
set by the external resistors: (RFB + RG)/RG. The maximum
input differential signal for which the output will respond
is approximately ±0.38V.
Power Supply Bypassing
The LT1187 is quite tolerant of power supply bypassing.
In some applications a 0.1F ceramic disc capacitor placed
1/2 inch from the amplier is all that is required. In ap-
plications requiring good settling time, it is important to
use multiple bypass capacitors. A 0.1F ceramic disc in
parallel with a 4.7F tantalum is recommended.
Calculating the Output Offset Voltage
Both input stages contribute to the output offset voltage at
Pin 6. The feedback correction forces balance in the input
stages by introducing an input VOS at Pin 8. The complete
expression for the output offset voltage is:
VOUT = (VOS + IOS(RS) + IB(RREF)) (RFB+ RG)/RG + IB(RFB)
RS represents the input source resistance, typically 75Ω,
and RREF represents the nite source impedance from the
DC reference voltage, for VREF grounded, RREF = 0Ω. The
IOS is normally a small contributor and the expression
simplies to:
VOUT = VOS(RFB + RG)/RG + IB(RFB)
If RFB is limited to 1k the last term of the equation con-
tributes only 2mV, since IB is less than 2A.
V +
7
6
LT1187
V –
4
1
8
OUT
V
+
3
–
2
IN
V
S/D
5
AV = +
RFB +
RFB
7
6
LT1187
4
1
8
OUT
V
+
3
–
2
IN DIFF
V
S/D
5
RFB
LT1187 AI01
7
6
LT1187
4
+/REF
1
–/FB
8
OUT
V
+
3
–
2
S/D
5
VO =
RFB +
RFB
7
6
LT1187
4
1
8
OUT
V
+
3
–
2
IN
V
S/D
5
AV = –
RFB +
RFB
IN
V
IN
V
(
( VIN DIFF
RFB
( ( VIN
+/REF
–/FB
+/REF
–/FB
+/REF
–/FB
RG
VO = (V
RFB +
IN DIFF + VIN)
RG
IN DIFF
V
RG
–
RG
V +
V –
V +
V –
V +
V –
ILT1187 F01
+ 1 REF
RREF
RG
8
RFB
6
350
mA
+
3
RS
345
mA
–
2
RS
7V +
RE
1.1k
RE
1.1k
4V –
Q1
Q2
Q3
Q4
Figure 1. Simplied Input Stage Schematic
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LT1187CN8#PBF | 功能描述:IC AMP VIDEO DIFFRNC ADJ 8-DIP RoHS:是 类别:集成电路 (IC) >> 线性 - 放大器 - 视频放大器和频缓冲器 系列:- 标准包装:1,000 系列:- 应用:驱动器 输出类型:差分 电路数:3 -3db带宽:350MHz 转换速率:1000 V/µs 电流 - 电源:14.5mA 电流 - 输出 / 通道:60mA 电压 - 电源，单路/双路(±):5 V ~ 12 V，±2.5 V ~ 6 V 安装类型:表面贴装 封装/外壳:20-VFQFN 裸露焊盘 供应商设备封装:20-QFN 裸露焊盘（4x4） 包装:带卷 (TR) |
| LT1187CS8 | 功能描述:IC AMP VIDEO DIFFRNC ADJ 8-SOIC RoHS:否 类别:集成电路 (IC) >> 线性 - 放大器 - 视频放大器和频缓冲器 系列:- 标准包装:1,000 系列:- 应用:驱动器 输出类型:差分 电路数:3 -3db带宽:350MHz 转换速率:1000 V/µs 电流 - 电源:14.5mA 电流 - 输出 / 通道:60mA 电压 - 电源，单路/双路(±):5 V ~ 12 V，±2.5 V ~ 6 V 安装类型:表面贴装 封装/外壳:20-VFQFN 裸露焊盘 供应商设备封装:20-QFN 裸露焊盘（4x4） 包装:带卷 (TR) |
| LT1187CS8#PBF | 功能描述:IC AMP VIDEO DIFFRNC ADJ 8-SOIC RoHS:是 类别:集成电路 (IC) >> 线性 - 放大器 - 视频放大器和频缓冲器 系列:- 标准包装:1,000 系列:- 应用:驱动器 输出类型:差分 电路数:3 -3db带宽:350MHz 转换速率:1000 V/µs 电流 - 电源:14.5mA 电流 - 输出 / 通道:60mA 电压 - 电源，单路/双路(±):5 V ~ 12 V，±2.5 V ~ 6 V 安装类型:表面贴装 封装/外壳:20-VFQFN 裸露焊盘 供应商设备封装:20-QFN 裸露焊盘（4x4） 包装:带卷 (TR) |
| LT1187CS8#TR | 功能描述:IC AMP VID DIFF CURR FDBK 8SOIC RoHS:否 类别:集成电路 (IC) >> 线性 - 放大器 - 视频放大器和频缓冲器 系列:- 标准包装:1,000 系列:- 应用:驱动器 输出类型:差分 电路数:3 -3db带宽:350MHz 转换速率:1000 V/µs 电流 - 电源:14.5mA 电流 - 输出 / 通道:60mA 电压 - 电源，单路/双路(±):5 V ~ 12 V，±2.5 V ~ 6 V 安装类型:表面贴装 封装/外壳:20-VFQFN 裸露焊盘 供应商设备封装:20-QFN 裸露焊盘（4x4） 包装:带卷 (TR) |
| LT1187CS8#TRPBF | 功能描述:IC AMP VIDEO DIFFRNC ADJ 8-SOIC RoHS:否 类别:集成电路 (IC) >> 线性 - 放大器 - 视频放大器和频缓冲器 系列:- 标准包装:1,000 系列:- 应用:驱动器 输出类型:差分 电路数:3 -3db带宽:350MHz 转换速率:1000 V/µs 电流 - 电源:14.5mA 电流 - 输出 / 通道:60mA 电压 - 电源，单路/双路(±):5 V ~ 12 V，±2.5 V ~ 6 V 安装类型:表面贴装 封装/外壳:20-VFQFN 裸露焊盘 供应商设备封装:20-QFN 裸露焊盘（4x4） 包装:带卷 (TR) |
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