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參數(shù)資料
| 型號： | LT1469IS8#TRPBF |
| 廠商： | Linear Technology |
| 文件頁數(shù)： | 5/20頁 |
| 文件大小： | 0K |
| 描述： | IC OPAMP 16BIT DUAL 90MHZ 8SOIC |
| 標準包裝： | 2,500 |
| 放大器類型： | 通用 |
| 電路數(shù)： | 2 |
| 轉(zhuǎn)換速率： | 22 V/µs |
| 增益帶寬積： | 90MHz |
| 電流 - 輸入偏壓： | 10nA |
| 電壓 - 輸入偏移： | 50µV |
| 電流 - 電源： | 4.1mA |
| 電流 - 輸出 / 通道： | 22mA |
| 電壓 - 電源，單路/雙路(±)： | ±2.5 V ~ 18 V |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 8-SOIC（0.154"，3.90mm 寬） |
| 供應商設備封裝： | 8-SO |
| 包裝： | 帶卷 (TR) |
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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