参数资料
型号: LTC2288CUP#TRPBF
厂商: Linear Technology
文件页数: 10/28页
文件大小: 0K
描述: IC ADC DUAL 10BIT 65MSPS 64QFN
标准包装: 2,000
位数: 10
采样率(每秒): 65M
数据接口: 并联
转换器数目: 2
功率耗散(最大): 450mW
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: 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
LTC2288/LTC2287/LTC2286
18
228876fa
25
25
0.1
F
AIN
+
AIN
2.2
F
VCM
ANALOG
INPUT
0.1
F
0.1
F
T1
T1 = MA/COM, ETC 1-1-13
RESISTORS, CAPACITORS, INDUCTORS
ARE 0402 PACKAGE SIZE
228876 F08
6.8nH
LTC2288
LTC2287
LTC2286
25
25
0.1
F
AIN
+
AIN
2.2
F
VCM
ANALOG
INPUT
0.1
F
0.1
F
T1
T1 = MA/COM, ETC 1-1-13
RESISTORS, CAPACITORS
ARE 0402 PACKAGE SIZE
228876 F07
LTC2288
LTC2287
LTC2286
25
25
12
12
0.1
F
AIN
+
AIN
8pF
2.2
F
VCM
ANALOG
INPUT
0.1
F
0.1
F
T1
T1 = MA/COM, ETC 1-1-13
RESISTORS, CAPACITORS
ARE 0402 PACKAGE SIZE
228876 F06
LTC2288
LTC2287
LTC2286
25
25
12pF
2.2
F
VCM
228876 F04
+
CM
ANALOG
INPUT
HIGH SPEED
DIFFERENTIAL
AMPLIFIER
AIN
+
AIN
LTC2288
LTC2287
LTC2286
Figure 5 shows a single-ended input circuit. The imped-
ance seen by the analog inputs should be matched. This
circuit is not recommended if low distortion is required.
APPLICATIO S I FOR ATIO
WU
UU
Figure 6. Recommended Front End Circuit for
Input Frequencies Between 70MHz and 170MHz
Figure 8. Recommended Front End Circuit for
Input Frequencies Above 300MHz
Figure 7. Recommended Front End Circuit for
Input Frequencies Between 170MHz and 300MHz
Figure 5. Single-Ended Drive
Figure 4. Differential Drive with an Amplifier
25
0.1
F
ANALOG
INPUT
VCM
AIN
+
AIN
1k
12pF
228876 F05
2.2
F
1k
25
0.1
F
LTC2288
LTC2287
LTC2286
The 25
resistorsand12pFcapacitorontheanaloginputs
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 trans-
former gives better high frequency response than a flux
coupled center tapped transformer. The coupling capaci-
tors 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.
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