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參數(shù)資料
型號(hào)： LTC2301HMS#PBF
廠商： Linear Technology
文件頁(yè)數(shù)： 6/26頁(yè)
文件大?。?/td> 0K
描述： IC ADC 12-BIT 1CHN 12-MSOP
標(biāo)準(zhǔn)包裝： 37
位數(shù)： 12
采樣率（每秒）： 14k
數(shù)據(jù)接口： I²C，串行
轉(zhuǎn)換器數(shù)目： 1
功率耗散（最大）： 17.5mW
電壓電源： 單電源
工作溫度： -40°C ~ 125°C
安裝類型： 表面貼裝
封裝/外殼： 12-TSSOP（0.118"，3.00mm 寬）
供應(yīng)商設(shè)備封裝： 12-MSOP
包裝： 管件
輸入數(shù)目和類型： 2 個(gè)單端，單極；2 個(gè)單端，雙極；1 個(gè)差分，單極；1 個(gè)差分，雙極
配用： DC1444A-A-ND - BOARD SAR ADC LTC2301
LTC2301/LTC2305
14
23015fb
APPLICATIONS INFORMATION
The magnitude of the DC current is then approximately
IDC=(VIN–VREFCOMP/2)/REQ,whichisroughlyproportional
to VIN.TopreventlargeDCdropsacrosstheresistorRFILTER,
a lter with a small resistor and large capacitor should be
chosen. When running at the maximum throughput rate
of 14ksps, the input current equals 1.5μA at VIN = 4.096V,
which amounts to a full-scale error of 0.5 LSBs when using
a lter resistor (RFILTER) of 333Ω. Applications requiring
lower sample rates can tolerate a larger lter resistor for
the same amount of full-scale error.
Figures 3a and 3b show respective examples of input
ltering for single-ended and differential inputs. For the
single-ended case in Figure 4a, a 50Ω source resistor
and a 2000pF capacitor to ground on the input will limit
the input bandwidth to 1.6MHz. High quality capacitors
and resistors should be used in the RC lter 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
Figure 2a. Analog Input Equivalent Circuit
Figure 2b. Analog Input Equivalent
Circuit for Large Filter Capacitances
VIN
INPUT
CH0, CH1,
IN+, IN–
RON =
100Ω
CIN =
55pF
CFILTER
RSOURCE
23015 F02a
LTC2301
LTC2305
VIN
INPUT
(CH0, CH1,
IN+, IN–)
REQ =
1/(fSMPL CIN)
VREFCOMP/2
CFILTER
RFILTER
IDC
23015 F02b
LTC2301
LTC2305
+
–
and from damage that may occur during soldering. Metal
lm surface mount resistors are much less susceptible
to both problems.
Dynamic Performance
Fast Fourier Transform (FFT) test techniques are used to
test the ADC’s frequency response, distortion and noise
at the rated throughput. By applying a low distortion
sine wave and analyzing the digital output using an FFT
algorithm, the ADC’s spectral content can be examined
for frequencies outside the fundamental.
Signal-to-Noise and Distortion Ratio (SINAD)
The signal-to-noise and distortion ratio (SINAD) is the
ratio between the RMS amplitude of the fundamental input
frequency to the RMS amplitude of all other frequency
components at the A/D output. The output is band-limited
to frequencies from above DC and below half the sampling
Figure 3a. Optional RC Input Filtering for Single-Ended Input
Figure 3b. Optional RC Input Filtering for Differential Inputs
23015 F03a
CH0, CH1
LTC2305
REFCOMP
2000pF
0.1μF
10μF
50Ω
ANALOG
INPUT
1000pF
23015 F03b
CH0, IN+
CH1, IN–
LTC2301
LTC2305
REFCOMP
1000pF
0.1μF
10μF
50Ω
DIFFERENTIAL
ANALOG
INPUTS
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