参数资料
| 型号： | LT1469IS8#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 5/20页 |
| 文件大小： | 0K |
| 描述： | IC OPAMP 16BIT DUAL 90MHZ 8SOIC |
| 标准包装： | 100 |
| 放大器类型： | 通用 |
| 电路数： | 2 |
| 转换速率： | 22 V/µs |
| 增益带宽积： | 90MHz |
| 电流 - 输入偏压： | 10nA |
| 电压 - 输入偏移： | 50µV |
| 电流 - 电源： | 4.1mA |
| 电流 - 输出 / 通道： | 22mA |
| 电压 - 电源，单路/双路(±)： | ±2.5 V ~ 18 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 8-SO |
| 包装： | 管件 |
LT1469
13
1469fb
APPLICATIONS INFORMATION
Capacitive Loading
The LT1469 drives capacitive loads of up to 100pF in unity-
gain and 300pF in a gain of –1. When there is a need to
drivealargercapacitiveload,asmallseriesresistorshould
be inserted between the output and the load. In addition,
a capacitor should be added between the output and the
inverting input as shown in Figure 3.
Settling Time
The LT1469 is a single stage amplifier with an optimal
thermal layout that leads to outstanding settling per-
formance. Measuring settling even at the 12-bit level is
very challenging, and at the 16-bit level requires a great
deal of subtlety and expertise. Fortunately, there are two
excellent Linear Technology reference sources for settling
measurements—ApplicationNotes47and74.AppendixB
of AN47 is a vital primer on 12-bit settling measurements
and AN74 extends the state-of-the-art while concentrating
on settling time with a 16-bit current output DAC input.
The settling of the DAC I-to-V converter on the front page
was measured using the exact methods of AN74. The
optimum nulling of the DAC output capacitance requires
15pFacrossthe12kfeedbackresistor.Thetheoreticallimit
for 16-bit settling is 11.1 times this RC time constant or
2s. The actual settling time is 2.4s at the output of the
LT1469.
The RC output noise filter adds a slight settling time delay
butreducesthenoisebandwidthto1.6MHzwhichincreases
the output resolution for 16-bit accuracy.
Figure 3. Driving Capacitive Loads
+
–
VOUT
RF
RO ≥ (1 + RF/RG)/(2 CL 5MHz)
RF ≥ 10RO
CF = (2RO/RF)CL
CF
1/2 LT1469
VIN
1469 F03
CL
RG
RO
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相关代理商/技术参数 |
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| LT1469IS8-TR | 制造商:LINER 制造商全称:Linear Technology 功能描述:Dual 90MHz, 22V/μs 16-Bit Accurate Operational Amplifi er |
| LT1469IS8-TRPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:Dual 90MHz, 22V/μs 16-Bit Accurate Operational Amplifi er |
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