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參數(shù)資料
| 型號： | LTC2156CUP-14#TRPBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | ADC |
| 英文描述： | 2-CH 14-BIT PROPRIETARY METHOD ADC, PARALLEL ACCESS, PQCC64 |
| 封裝： | 9 X 9 MM, LEAD FREE, PLASTIC, MO-220WNJR-5, QFN-64 |
| 文件頁數(shù)： | 10/32頁 |
| 文件大?。?/td> | 647K |
| 代理商： | LTC2156CUP-14#TRPBF |
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LTC2157-14/
LTC2156-14/LTC2155-14
18
21576514f
APPLICATIONS INFORMATION
Figure 5. Recommended Front-End Circuit for
Input Frequencies from 150MHz to 900MHz
Figure 6. Front-End Circuit Using a High
Speed Differential Amplifier
Amplifier Circuits
Figure 6 shows the analog input being driven by a high
speed differential amplifier. The output of the amplifier is
AC coupled to the A/D so the amplifier’s output common
mode voltage can be optimally set to minimize distortion.
At very high frequencies an RF gain block will often have
lower distortion than a differential amplifier. If the gain
block is single-ended, then a transformer circuit (Figures
3 and 5) should convert the signal to differential before
driving the A/D. The A/D cannot be driven single-ended.
Reference
The LTC2157-14/LTC2156-14/LTC2155-14 has an internal
1.25V voltage reference. For a 1.5V input range with in-
ternal reference, connect SENSE to VDD. For a 1.5V input
range with an external reference, apply a 1.25V reference
voltage to SENSE (Figure 7).
Encode Input
The signal quality of the encode inputs strongly affects
the A/D noise performance. The encode inputs should
be treated as analog signals—do not route them next to
digital traces on the circuit board.
The encode inputs are internally biased to 1.2V through
10k equivalent resistance (Figure 8). If the common mode
of the driver is within 1.1V to 1.5V, it is possible to drive
the encode inputs directly. Otherwise a transformer or
coupling capacitors are needed (Figures 9 and 10). The
maximum (peak) voltage of the input signal should never
exceed VDD +0.1V or go below –0.1V.
4.7Ω
50Ω
0.1μF
AIN
+
AIN
–
0.1μF
3pF
VCM
LTC2157-14
21576514 F06
INPUT
0.1μF
45Ω
10Ω
100Ω
4.7Ω
0.1μF
IN
0.1μF
T1: MABA
007159-000000
21576514 F05
LTC2157-14
AIN
+
AIN
–
VCM
Figure 7. Reference Circuit
Figure 8. Equivalent Encode Input Circuit
VDD
LTC2157-14
21576514 F08
1.2V
10k
ENC+
ENC–
SCALER/
BUFFER
VREF
2.2μF
SENSE
1.25V
LTC2157-14
21576514 F07
5Ω
ADC
REFERENCE
SENSE
DETECTOR
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LTC2155CUP-14#TRPBF | 2-CH 14-BIT PROPRIETARY METHOD ADC, PARALLEL ACCESS, PQCC64 |
| LTC2156IUP-14#TRPBF | 2-CH 14-BIT PROPRIETARY METHOD ADC, PARALLEL ACCESS, PQCC64 |
| LTC2156CUP-14#PBF | 2-CH 14-BIT PROPRIETARY METHOD ADC, PARALLEL ACCESS, PQCC64 |
| LTC2157IUP-14#TRPBF | 2-CH 14-BIT PROPRIETARY METHOD ADC, PARALLEL ACCESS, PQCC64 |
| LTC2155IUP-14#PBF | 2-CH 14-BIT PROPRIETARY METHOD ADC, PARALLEL ACCESS, PQCC64 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LTC2156IUP-12 | 制造商:Linear Technology 功能描述:ADC DUAL 12BIT 210M 64QFN 制造商:Linear Technology 功能描述:ADC, DUAL, 12BIT, 210M, 64QFN |
| LTC2156IUP-12#PBF | 功能描述:IC ADC DUAL 12BIT 210M 64-QFN RoHS:是 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 模數(shù)轉(zhuǎn)換器 系列:- 其它有關(guān)文件:TSA1204 View All Specifications 標(biāo)準(zhǔn)包裝:1 系列:- 位數(shù):12 采樣率（每秒）:20M 數(shù)據(jù)接口:并聯(lián) 轉(zhuǎn)換器數(shù)目:2 功率耗散（最大）:155mW 電壓電源:模擬和數(shù)字 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:48-TQFP 供應(yīng)商設(shè)備封裝:48-TQFP（7x7） 包裝:Digi-Reel® 輸入數(shù)目和類型:4 個單端，單極；2 個差分，單極 產(chǎn)品目錄頁面:1156 (CN2011-ZH PDF) 其它名稱:497-5435-6 |
| LTC2156IUP-12#TRPBF | 制造商:Linear Technology 功能描述:IC ADC DUAL 12BIT 210M 64-QFN |
| LTC2156IUP-14#PBF | 制造商:Linear Technology 功能描述:IC ADC DUAL 210MSPS 64-QFN |
| LTC2156IUP-14#TRPBF | 制造商:Linear Technology 功能描述:IC ADC DUAL 210MSPS 64-QFN |
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