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參數(shù)資料
| 型號： | LTC2365ITS8#TRMPBF |
| 廠商： | Linear Technology |
| 文件頁數(shù)： | 11/24頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC ADC 12BIT 1MSPS TSOT23-8 |
| 標(biāo)準(zhǔn)包裝： | 1 |
| 位數(shù)： | 12 |
| 采樣率（每秒）： | 1M |
| 數(shù)據(jù)接口： | MICROWIRE?，串行，SPI? |
| 轉(zhuǎn)換器數(shù)目： | 1 |
| 功率耗散（最大）： | 12.6mW |
| 電壓電源： | 單電源 |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | SOT-23-8 薄型，TSOT-23-8 |
| 供應(yīng)商設(shè)備封裝： | TSOT-23-8 |
| 包裝： | 標(biāo)準(zhǔn)包裝 |
| 輸入數(shù)目和類型： | 1 個(gè)單端，單極 |
| 產(chǎn)品目錄頁面： | 1347 (CN2011-ZH PDF) |
| 其它名稱： | LTC2365ITS8#TRMPBFDKR |
LTC2365/LTC2366
19
23656fb
For more information www.linear.com/LTC2365
applications inForMation
Figure 18. RC Input Filter
Input Filtering and Source Impedance
Thenoiseandthedistortionoftheinputamplifierandother
circuitry must be considered since they will add to the
LTC2365/LTC2366 noise and distortion. The small-signal
bandwidth of the sample-and-hold circuit is 50MHz. Any
noise or distortion products that are present at the analog
inputs will be summed over this entire bandwidth. Noisy
input circuitry should be filtered prior to the analog inputs
to minimize noise. A simple 1-pole RC filter is sufficient for
many applications. For example, Figure 18 shows a 47pF
capacitor from AIN to ground and a 51 source resistor to
limittheinputbandwidthto47MHz.The47pFcapacitoralso
acts as a charge reservoir for the input sample-and-hold
and isolates the ADC input from sampling-glitch sensitive
circuitry. High quality capacitors and resistors should be
used since these components can add distortion. NPO
and silver mica type dielectric capacitors have excellent
linearity. Carbon surface mount resistors can generate
distortion from self heating and from damage that may
occurduringsoldering.Metalfilmsurfacemountresistors
are much less susceptible to both problems. When high
amplitude unwanted signals are close in frequency to the
desired signal frequency, a multiple pole filter is required.
Highexternalsourceresistance,combinedwiththe20pFof
input capacitance, will reduce the rated 50MHz bandwidth
and increase acquisition time beyond 56ns.
Reference Input
On the TS8 package of the LTC2365/LTC2366, the voltage
on the VREF pin defines the full-scale range of the ADC.
The reference voltage can range from VDD down to 1.4V.
Input Range
The analog input of the LTC2365/LTC2366 is driven
single-ended with respect to GND from a single supply.
The input may swing up to VDD for the S6 package and
to VREF for the TS8 package. The 0V to 2.5V range is also
ideally suited for single-ended input use with VDD or VREF
= 2.5V for single supply applications. If the difference
between the AIN input and GND exceeds VDD for the S6
package or VREF for the TS8 package, the output code will
stay fixed at all ones, and if this difference goes below 0V,
the output code will stay fixed at all zeros.
Figure 19 shows the ideal input/output characteristics for
the LTC2365/LTC2366. The code transitions occur mid-
way between successive integer LSB values (i.e. 0.5LSB,
1.5LSB, 2.5LSB, …, FS –1.5LSB). The output code is
straight binary with 1LSB = VDD/4096 for the S6 package
and 1LSB = VREF/4096 for the TS8 package.
VDD
GND
LTC2366
23656 F18
10F
47pF
51
6
5
4
1
2
3
CS
SD0
SCK
AIN
Figure 19. LTC2365/LTC2366 Transfer Characteristics
INPUT VOLTAGE (V)
UNIPOLAR
OUTPUT
CODE
23656 F19
111...111
111...110
000...000
000...001
FS – 1LSB
1LSB
0
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