參數(shù)資料
型號(hào)： LTC2309IUF#TRPBF
廠商： Linear Technology
文件頁數(shù)： 5/26頁
文件大?。?/td> 0K
描述： IC ADC 12BIT SAR 24-QFN
標(biāo)準(zhǔn)包裝： 2,500
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）： 15mW
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： 24-WFQFN 裸露焊盤
供應(yīng)商設(shè)備封裝： 24-QFN 裸露焊盤（4x4）
包裝： 帶卷 (TR)
輸入數(shù)目和類型： 8 個(gè)單端，單極；8 個(gè)單端，雙極；4 個(gè)差分，單極；4 個(gè)差分，雙極
配用： DC1337A-ND - BOARD SAR ADC LTC2309
LTC2309
2309fd
Total Harmonic Distortion (THD)
Total harmonic distortion (THD) is the ratio of the
RMSsumofallharmonicsoftheinputsignaltothe
fundamentalitself.Theout-of-bandharmonicsaliasinto
thefrequencybandbetweenDCandhalfthesampling
frequency(fSMPL/2).THDisexpressedas:
THD
V
N
=
+
20
2
3
2
4
2
1
log
...
where V1istheRMSamplitudeofthefundamental
frequencyandV2throughVNaretheamplitudesofthe
secondthroughNthharmonics.
Internal Reference
The LTC2309 has an on-chip, temperature compen-
sated bandgap reference that is factory trimmed to
2.5V(RefertoFigure6a).Itisinternallyconnectedtoa
referenceamplifierandisavailableatVREF.VREFshould
bebypassedtoGNDwitha2.2μFceramiccapacitorto
minimizenoise.An8kresistorisinserieswiththeoutput
sothatitcanbeeasilyoverdrivenbyanexternalrefer-
enceifmoreaccuracyand/orlowerdriftarerequired,
asshowninFigure6b.Thereferenceamplifiergains
theVREFvoltageby1.638to4.096VatREFCOMP.To
compensatethereferenceamplifier,bypassREFCOMP
witha10μFceramiccapacitorinparallelwitha0.1μF
ceramic capacitor for best noise performance. The
internalreferencebuffercanalsobeoverdrivenfrom
1VtoVDD,asshowninFigure6c.Todoso,VREFmust
begroundedtodisablethereferencebuffer.
AppLICAtIOns InFORMAtIOn
Figure 5. 1kHz Sine Wave 8192 Point FFT Plot
R2
R3
REFERENCE
AMP
0.1F
10F
2.2F
REFCOMP
GND
VREF
R1
8k
2.5V
4.096V
LTC2309
2309 F06a
BANDGAP
REFERENCE
Figure 6a. LTC2309 Reference Circuit
0.1F
10F
2309 F06b
LT1790A-2.5
VOUT
VIN
5V
VREF
LTC2309
GND
REFCOMP
2.2F
0.1F
Figure 6b. Using the LT1790A-2.5 as an External Reference
FREQUENCY (kHz)
0
–140
MAGNITUDE
(dB)
–120
–100
–80
0
–40
1
3
4
7
2309 G03
–20
–60
2
5
6
SNR = 73.4dB
SINAD = 73.3dB
THD = –88dB
Figure 6c. Overdriving REFCOMP Using the LT1790A-4.096
0.1F
10F
2309 F06c
LT1790A-4.096
VOUT
VIN
5V
VREF
LTC2309
GND
REFCOMP
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