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参数资料
| 型号： | LTC2285IUP#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 6/24页 |
| 文件大小： | 0K |
| 描述： | IC ADC DUAL 14BIT 125MSPS 64QFN |
| 标准包装： | 2,000 |
| 位数： | 14 |
| 采样率（每秒）： | 125M |
| 数据接口： | 并联 |
| 转换器数目： | 2 |
| 功率耗散（最大）： | 915mW |
| 电压电源： | 单电源 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 64-WFQFN 裸露焊盘 |
| 供应商设备封装： | 64-QFN（9x9） |
| 包装： | 带卷 (TR) |
| 输入数目和类型： | 2 个单端，双极; 2 个差分, 双极 |
LTC2285
14
2285fb
APPLICATIONS INFORMATION
Figure 4 demonstrates the use of a differential amplier to
convert a single ended input signal into a differential input
signal. The advantage of this method is that it provides
low frequency input response; however, the limited gain
bandwidth of most op amps will limit the SFDR at high
input frequencies.
Figure 5 shows a single-ended input circuit. The impedance
seen by the analog inputs should be matched. This circuit
is not recommended if low distortion is required.
The 25Ω resistors and 12pF capacitor on the analog
inputs serve two purposes: isolating the drive circuitry
from the sample-and-hold charging glitches and limiting
the wideband noise at the converter input.
For input frequencies above 70MHz, the input circuits of
Figure 6, 7 and 8 are recommended. The balun transformer
gives better high frequency response than a ux coupled
center tapped transformer. The coupling capacitors allow
the analog inputs to be DC biased at 1.5V. In Figure 8, the
series inductors are impedance matching elements that
maximize the ADC bandwidth.
Figure 4. Differential Drive with an Amplier
Figure 5. Single-Ended Drive
Figure 6. Recommended Front End Circuit for
Input Frequencies Between 70MHz and 170MHz
Figure 7. Recommended Front End Circuit for
Input Frequencies Between 170MHz and 300MHz
Figure 8. Recommended Front End Circuit for
Input Frequencies Above 300MHz
25Ω
12pF
2.2μF
VCM
2285 F04
–
+
CM
ANALOG
INPUT
HIGH SPEED
DIFFERENTIAL
AMPLIFIER
AIN
+
AIN
–
LTC2285
25Ω
0.1μF
ANALOG
INPUT
VCM
AIN
+
AIN
–
1k
12pF
2285 F05
2.2μF
1k
25Ω
0.1μF
LTC2285
25Ω
12Ω
0.1μF
AIN
+
AIN
–
8pF
2.2μF
VCM
ANALOG
INPUT
0.1μF
T1
T1 = MA/COM, ETC 1-1-13
RESISTORS, CAPACITORS
ARE 0402 PACKAGE SIZE
2285 F06
LTC2285
25Ω
0.1μF
AIN
+
AIN
–
2.2μF
VCM
ANALOG
INPUT
0.1μF
T1
T1 = MA/COM, ETC 1-1-13
RESISTORS, CAPACITORS
ARE 0402 PACKAGE SIZE
2285 F07
LTC2285
25Ω
0.1μF
AIN
+
AIN
–
2.2μF
VCM
ANALOG
INPUT
0.1μF
T1
T1 = MA/COM, ETC 1-1-13
RESISTORS, CAPACITORS, INDUCTORS
ARE 0402 PACKAGE SIZE
2285 F08
8.2nH
LTC2285
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| LTC2286CUP#PBF | 功能描述:IC ADC DUAL 10BIT 25MSPS 64QFN RoHS:是 类别:集成电路 (IC) >> 数据采集 - 模数转换器 系列:- 标准包装:1,000 系列:- 位数:12 采样率（每秒）:300k 数据接口:并联 转换器数目:1 功率耗散（最大）:75mW 电压电源:单电源 工作温度:0°C ~ 70°C 安装类型:表面贴装 封装/外壳:24-SOIC（0.295"，7.50mm 宽） 供应商设备封装:24-SOIC 包装:带卷 (TR) 输入数目和类型:1 个单端，单极；1 个单端，双极 |
| LTC2286CUP#TRPBF | 功能描述:IC ADC DUAL 10BIT 25MSPS 64QFN RoHS:是 类别:集成电路 (IC) >> 数据采集 - 模数转换器 系列:- 标准包装:1,000 系列:- 位数:16 采样率（每秒）:45k 数据接口:串行 转换器数目:2 功率耗散（最大）:315mW 电压电源:模拟和数字 工作温度:0°C ~ 70°C 安装类型:表面贴装 封装/外壳:28-SOIC（0.295"，7.50mm 宽） 供应商设备封装:28-SOIC W 包装:带卷 (TR) 输入数目和类型:2 个单端，单极 |
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