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參數(shù)資料
| 型號： | LTC2165IUK#TRPBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | ADC |
| 英文描述： | 1-CH 16-BIT PROPRIETARY METHOD ADC, PARALLEL ACCESS, PQCC48 |
| 封裝： | 7 X 7 MM, LEAD FREE, PLASTIC, MO-220WKKD-2, QFN-48 |
| 文件頁數(shù)： | 11/36頁 |
| 文件大小： | 663K |
| 代理商： | LTC2165IUK#TRPBF |
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LTC2165/LTC2164/LTC2163
19
216543f
CONVERTER OPERATION
The LTC2165/LTC2164/LTC2163 are low power, 16-bit,
125/105/80Msps A/D converters that are powered by a
single 1.8V supply. The analog inputs should be driven
differentially. The encode input can be driven differentially
or single-ended for lower power consumption. The digital
outputs can be CMOS, double data rate CMOS (to halve
the number of output lines), or double data rate LVDS
(to reduce digital noise in the system). Many additional
features can be chosen by programming the mode control
registers through a serial SPI port.
ANALOG INPUT
The analog inputs are differential CMOS sample-and-hold
circuits(Figure2).Theinputsshouldbedrivendifferentially
around a common mode voltage set by the VCM output
pin, which is nominally VDD/2. For the 2V input range,
the inputs should swing from VCM – 0.5V to VCM + 0.5V.
Thereshouldbe180°phasedifferencebetweentheinputs.
Single-Ended Input
Forapplicationslesssensitivetoharmonicdistortion,theAIN+
inputcanbedrivensingle-endedwitha1VP-Psignalcentered
aroundVCM.TheAIN–inputshouldbeconnectedtoVCM and
applicaTions inForMaTion
Figure 2. Equivalent Input Circuit
Figure 3. Analog Input Circuit Using a Transformer.
Recommended for Input Frequencies from 5MHz to 70MHz
CSAMPLE
5pF
RON
15
RON
15
VDD
LTC2165
AIN+
2165 F02
CSAMPLE
5pF
VDD
AIN–
ENC–
ENC+
1.2V
10k
1.2V
10k
CPARASITIC
1.8pF
CPARASITIC
1.8pF
10
the VCM bypass capacitor should be increased to 2.2F.
With a single-ended input the harmonic distortion and INL
willdegrade,butthenoiseandDNLwillremainunchanged.
INPUT DRIVE CIRCUITS
Input filtering
If possible, there should be an RC lowpass filter right at
the analog inputs. This lowpass filter isolates the drive
circuitryfromtheA/Dsample-and-holdswitching,andalso
limits wideband noise from the drive circuitry. Figure 3
shows an example of an input RC filter. The RC component
values should be chosen based on the application’s input
frequency.
Transformer Coupled Circuits
Figure 3 shows the analog input being driven by an RF
transformer with a center-tapped secondary. The center
tap is biased with VCM, setting the A/D input at its optimal
DC level. At higher input frequencies a transmission line
balun transformer (Figures 4 through 6) has better bal-
ance, resulting in lower A/D distortion.
Amplifier Circuits
Figure 7 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 4
through 6) should convert the signal to differential before
driving the A/D.
25
50
AIN+
AIN–
12pF
0.1F
VCM
LTC2165
ANALOG
INPUT
0.1F
T1
1:1
T1: MA/COM MABAES0060 RESISTORS,
CAPACITORS ARE 0402 PACKAGE SIZE
2165 F03
0.1F
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PDF描述 |
|---|---|
| LTC2163CUK#PBF | 1-CH 16-BIT PROPRIETARY METHOD ADC, PARALLEL ACCESS, PQCC48 |
| LTC2165CUK#TRPBF | 1-CH 16-BIT PROPRIETARY METHOD ADC, PARALLEL ACCESS, PQCC48 |
| LTC2163IUK#PBF | 1-CH 16-BIT PROPRIETARY METHOD ADC, PARALLEL ACCESS, PQCC48 |
| LTC2170CUKG-12#TRPBF | 4-CH 12-BIT PROPRIETARY METHOD ADC, SERIAL ACCESS, PQCC52 |
| LTC2170IUKG-12#PBF | 4-CH 12-BIT PROPRIETARY METHOD ADC, SERIAL ACCESS, PQCC52 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LTC2170-12 | 制造商:LINER 制造商全稱:Linear Technology 功能描述:12-Bit, 65Msps/40Msps/25Msps Low Power Quad ADCs |
| LTC2170-14 | 制造商:LINER 制造商全稱:Linear Technology 功能描述:Quad 14-Bit, 125Msps ADC with Integrated Drivers |
| LTC2170CUKG-12#PBF | 功能描述:IC ADC 12BIT SER/PAR 25M 52-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:- 標準包裝:1 系列:- 位數(shù):14 采樣率（每秒）:83k 數(shù)據(jù)接口:串行，并聯(lián) 轉(zhuǎn)換器數(shù)目:1 功率耗散（最大）:95mW 電壓電源:雙 ± 工作溫度:0°C ~ 70°C 安裝類型:通孔 封裝/外殼:28-DIP（0.600"，15.24mm） 供應(yīng)商設(shè)備封裝:28-PDIP 包裝:管件 輸入數(shù)目和類型:1 個單端，雙極 |
| LTC2170CUKG-12#TRPBF | 功能描述:IC ADC 12BIT SER/PAR 25M 52-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:- 標準包裝:1 系列:- 位數(shù):14 采樣率（每秒）:83k 數(shù)據(jù)接口:串行，并聯(lián) 轉(zhuǎn)換器數(shù)目:1 功率耗散（最大）:95mW 電壓電源:雙 ± 工作溫度:0°C ~ 70°C 安裝類型:通孔 封裝/外殼:28-DIP（0.600"，15.24mm） 供應(yīng)商設(shè)備封裝:28-PDIP 包裝:管件 輸入數(shù)目和類型:1 個單端，雙極 |
| LTC2170CUKG-12PBF | 制造商:LINER 制造商全稱:Linear Technology 功能描述:12-Bit, 65Msps/40Msps/25Msps Low Power Quad ADCs |
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