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| 型號： | LTC2355CMSE-14 |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | ADC |
| 英文描述： | Serial 12-Bit/14-Bit, 3.5Msps Sampling ADCs with Shutdown |
| 中文描述： | 1-CH 14-BIT PROPRIETARY METHOD ADC, SERIAL ACCESS, PDSO10 |
| 封裝： | PLASTIC, MSOP-10 |
| 文件頁數(shù)： | 9/16頁 |
| 文件大小： | 232K |
| 代理商： | LTC2355CMSE-14 |
9
LTC2355-12/LTC2355-14
2355f
DRIVING THE ANALOG INPUT
T
he differential analog inputs of the LTC2355-12/LTC2355-14
may be driven differentially or
as a single-ended input (i.e., the
A
IN–
input is grounded). Both differential analog inputs, A
IN+
and A
IN–
, are sampled at the same instant. Any unwanted
signal that is common to both inputs of each input pair will be
reduced by the common mode rejection of the sample-and-
hold circuit. The inputs draw only one small current spike
while charging the sample-and-hold capacitors at the end of
conversion. During conversion, the analog inputs draw only
a small leakage current. If the source impedance of the driving
circuit is low, then the LTC2355-12/LTC2355-14 inputs can
be driven directly. As source impedance increases, so will
acquisition time. For minimum acquisition time with high
source impedance, a buffer amplifier must be used. The main
requirement is that the amplifier driving the analog input(s)
must settle after the small current spike before the next
conversion starts (settling time must be 39ns for full through-
put rate). Also keep in mind while choosing an input amplifier
the amount of noise and harmonic distortion added by the
amplifier.
CHOOSING AN INPUT AMPLIFIER
Choosing an input amplifier is easy if a few requirements are
taken into consideration. First, to limit the magnitude of the
voltage spike seen by the amplifier from charging the sam-
pling capacitor, choose an amplifier that has a low output
impedance (<100
) at the closed-loop bandwidth frequency.
For example, if an amplifier is used in a gain of 1 and has a
unity-gain bandwidth of 50MHz, then the output impedance
at 50MHz must be less than 100
. The second requirement
is that the closed-loop bandwidth must be greater than
40MHz to ensure adequate small-signal settling for full
throughput rate. If slower op amps are used, more time for
settling can be provided by increasing the time between
conversions. The best choice for an op amp to drive the
LTC2355-12/LTC2355-14 will depend on the application.
Generally, applications fall into two categories: AC applica-
tions where dynamic specifications are most critical and time
domain applications where DC accuracy and settling time are
most critical. The following list is a summary of the op amps
that are suitable for driving the LTC2355-12/LTC2355-14.
(More detailed information is available in the Linear Technol-
ogy Databooks and on the LinearView
TM
CD-ROM.)
LTC1566-1:
Low Noise 2.3MHz Continuous Time Low-Pass
Filter.
LT
1630:
Dual 30MHz Rail-to-Rail Voltage FB Amplifier.
2.7V to
±
15V supplies. Very high A
VOL
, 500
μ
V offset and
520ns settling to 0.5LSB for a 4V swing. THD and noise are
–93dB to 40kHz and below 1LSB to 320kHz (A
V
= 1, 2V
P-P
into 1k
, V
S
= 5V), making the part excellent for AC
applications (to 1/3 Nyquist) where rail-to-rail performance
is desired. Quad version is available as LT1631.
LT1632:
Dual 45MHz Rail-to-Rail Voltage FB Amplifier. 2.7V
to
±
15V supplies. Very high A
VOL
, 1.5mV offset and 400ns
settling to 0.5LSB for a 4V swing. It is suitable for applica-
tions with a single 5V supply. THD and noise are
–93dB to 40kHz and below 1LSB to 800kHz (A
V
= 1,
2V
P-P
into 1k
, V
S
= 5V), making the part excellent for AC
applications where rail-to-rail performance is desired.
Quad
version is available as LT1633.
LT1813:
Dual 100MHz 750V/
μ
s 3mA Voltage Feedback
Amplifier. 5V to
±
5V supplies. Distortion is –86dB to 100kHz
and –77dB to 1MHz with
±
5V supplies (2V
P-P
into 500
).
Excellent part for fast AC applications with
±
5V supplies.
LT1801:
80MHz GBWP, –75dBc at 500kHz, 2mA/Amplifier,
8.5nV/
√
Hz.
LT1806/LT1807:
325MHz GBWP, –80dBc Distortion at 5MHz,
Unity-Gain Stable, R-R In and Out, 10mA/Amplifier, 3.5nV/
√
Hz.
LT1810:
180MHz GBWP, –90dBc Distortion at 5MHz,
Unity-Gain Stable, R-R In and Out, 15mA/Amplifier, 16nV/
√
Hz.
LT1818/LT1819:
400MHz, 2500V/
μ
s,9mA, Single/Dual Volt-
age Mode Operational Amplifier.
LT6200:
165MHz GBWP, –85dBc Distortion at 1MHz, Unity-
Gain Stable, R-R In and Out, 15mA/Amplifier,
0.95nV/
√
Hz.
LT6203:
100MHz GBWP, –80dBc Distortion at 1MHz,
Unity-Gain Stable, R-R In and Out, 3mA/Amplifier,
1.9nV/
√
Hz.
LT6600-10:
Amplifier/Filter Differential In/Out with 10MHz
Cutoff.
APPLICATIU
W
U
U
LinearView is a trademark of Linear Technology Corporation.
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| LTC2355IMSE-12 | Serial 12-Bit/14-Bit, 3.5Msps Sampling ADCs with Shutdown |
| LTC2355IMSE-14 | Serial 12-Bit/14-Bit, 3.5Msps Sampling ADCs with Shutdown |
| LTCVX | Serial 12-Bit/14-Bit, 3.5Msps Sampling ADCs with Shutdown |
| LTCVY | Serial 12-Bit/14-Bit, 3.5Msps Sampling ADCs with Shutdown |
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相關(guān)代理商/技術(shù)參數(shù) |
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|---|---|
| LTC2355CMSE-14#PBF | 功能描述:IC ADC 14BIT 3.5MSPS 10-MSOP 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:microPOWER™ 位數(shù):8 采樣率（每秒）:1M 數(shù)據(jù)接口:串行，SPI? 轉(zhuǎn)換器數(shù)目:1 功率耗散（最大）:- 電壓電源:模擬和數(shù)字 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:24-VFQFN 裸露焊盤 供應商設(shè)備封裝:24-VQFN 裸露焊盤（4x4） 包裝:Digi-Reel® 輸入數(shù)目和類型:8 個單端，單極 產(chǎn)品目錄頁面:892 (CN2011-ZH PDF) 其它名稱:296-25851-6 |
| LTC2355CMSE-14#PBF | 制造商:Linear Technology 功能描述:IC, ADC, 14BIT, 3.5MSPS, MSOP-10 |
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