AD7988-1 AD8641 ADR435 高達1kHz 低于奈奎斯特頻率輸入信號優(yōu)化的低功耗數(shù)據(jù)采集系統(tǒng)

ID:124161 · 發(fā)表于 2016-6-19 14:19

實物圖：

圖中的電路采用16位、100 kSPS逐次逼近型模數(shù)轉(zhuǎn)換器 (ADC)系統(tǒng)，集成驅(qū)動放大器，針對最高1 kHz輸入信號和 100 kSPS采樣速率、功耗低至7.35 mW的系統(tǒng)而優(yōu)化。
這種方法對于便攜式電池供電、要求低功耗的多通道應(yīng)用極為有用。它還為那些兩次轉(zhuǎn)換突發(fā)之間的大部分時間 ADC都處于空閑狀態(tài)的應(yīng)用提供了優(yōu)勢。
通常，選擇高性能逐次逼近型ADC的驅(qū)動放大器處理寬范圍的輸入頻率。然而，當(dāng)某個應(yīng)用需要更低的采樣速率時，便可節(jié)省大量功耗，因為降低采樣速率會相應(yīng)地降低 ADC功耗。
若要完全利用通過降低ADC采樣速率使功耗下降的優(yōu)勢，則需要使用低帶寬、低功耗放大器。
例如，推薦80 MHz的ADA4841-1 運算放大器(10 V時功耗為 12 mW)與AD7988-1 16位逐次逼近型寄存器(SAR) ADC(100 kSPS時功耗為0.7 mW)一同使用。包括ADR435 基準(zhǔn)電壓源 (7.5 V時功耗為4.65 mW)在內(nèi)的總系統(tǒng)功耗在100 kSPS時為 17.35 mW。
對于最高1 kHz的輸入帶寬和100 kSPS的采樣速率，AD8641 3 MHz運算放大器(10 V時功耗為2 mW)可提供出色的信噪比(SNR)和總諧波失真(THD)性能，并且在100 kSPS時可將總系統(tǒng)功耗從17.35 mW降低至7.35 mW，降幅達58%。

電路原理圖：

BOM表（完整版見附件）：

C1	CAP+	10uF	±10%	RTAJ_B	Yes	Top	20V Tantalum Capacitor	AVX	TAJB106K020RNJ	FEC 197427
C2	CAP+	10uF	±10%	RTAJ_B	Yes	Top	20V Tantalum Capacitor	AVX	TAJB106K020RNJ	FEC 197427
C3	CAP	4.7 μF	0.1	C0805	Yes	Top	CAPACITOR CERAMIC, 4.7UF, 16V, X7R, 0805	TAIYO YUDEN	EMK212B7475KG-T	FEC 1853520
C4	CAP	4.7 μF	0.1	C0805	Yes	Top	CAPACITOR CERAMIC, 4.7UF, 16V, X7R, 0805	TAIYO YUDEN	EMK212B7475KG-T	FEC 1853520
C5	CAP+	10uF	±10%	RTAJ_B	Yes	Top	20V Tantalum Capacitor	AVX	TAJB106K020RNJ	FEC 197427
C6	CAP	4.7 μF	0.1	C0805	Yes	Top	CAPACITOR CERAMIC, 4.7UF, 16V, X7R, 0805	TAIYO YUDEN	EMK212B7475KG-T	FEC 1853520
C7	CAP	4.7 μF	0.1	C0805	Yes	Top	CAPACITOR CERAMIC, 4.7UF, 16V, X7R, 0805	TAIYO YUDEN	EMK212B7475KG-T	FEC 1853520
C8	CAP	0.1uF	±10%	C0603	Yes	Top	50V X7R Ceramic Capacitor	Murata	GRM188R71H104KA93D	FEC 8820023
C9	CAP+	10uF	±10%	RTAJ_B	Yes	Top	20V Tantalum Capacitor	AVX	TAJB106K020RNJ	FEC 197427
C10	CAP	0.1uF	±10%	C0805	Yes	Top	CAPACITOR, 0805, 100NF, 50V, X7R	Kemet	C0805C104K5RACTU	FEC 1414664
C11	CAP	10uF	20%	1206	Yes	Top	CAPACITOR CERAMIC 10UF, 25V, X5R, 1206	TAIYO YUDEN	TMK316BJ106ML-T	FEC 1684002
C12	CAP	22 μF	0.2	1206	Yes	Top	CAPACITOR CERAMIC, 22UF, 16V, X5R, 1206	MURATA	GRM31CR61C226KE15L	FEC 182-8815
C13	CAP+	10uF	±10%	RTAJ_B	Yes	Top	20V Tantalum Capacitor	AVX	TAJB106K020RNJ	FEC 197427
C14	CAP	4u7F	10%	1206	Yes	Top	CAPACITOR CERAMIC, 4.7UF, 16V, X5R, 1206	TAIYO YUDEN	EMK316BJ475KL-T	FEC 6578937
C15	CAP	1uF	±10%	C0805	Yes	Top	CAPACITOR, 0805, 1UF, 50V, X7R	MURATA	GRM21BR71H105KA12L	FEC 1735541
C16	CAP	1uF	±10%	C0805	Yes	Top	CAPACITOR, 0805, 1UF, 50V, X7R	Murata	GRM21BR71H105KA12L	FEC 1735541
C17	CAP	1uF	±10%	C0805	Yes	Top	CAPACITOR, 0805, 1UF, 50V, X7R	MURATA	GRM21BR71H105KA12L	FEC 1735541
C18	CAP	10nF	±10%	C0603	Yes	Top	50V X7R Ceramic Capacitor	Murata	GRM188R71H103KA01D	FEC 1118178
C19	CAP+	10uF	±10%	RTAJ_B	Yes	Top	20V Tantalum Capacitor	AVX	TAJB106K020RNJ	FEC 197427
C20	CAP	0.1uF	±10%	C0603	Yes	Top	50V X7R Ceramic Capacitor	Murata	GRM188R71H104KA93D	FEC 8820023
C21	CAP	1uF	±10%	C0805	Yes	Top	CAPACITOR, 0805, 1UF, 50V, X7R	MURATA	GRM21BR71H105KA12L	FEC 1735541
C22	CAP	1uF	±10%	C0805	Yes	Top	CAPACITOR, 0805, 1UF, 50V, X7R	MURATA	GRM21BR71H105KA12L	FEC 1735541
C23	CAP	0.1uF	±10%	C0603	Yes	Top	50V X7R Ceramic Capacitor	MURATA	GRM188R71H104KA93D	FEC 8820023
C24	CAP	DNP	±5%	C0603	Yes	Top	CAPACITOR CERAMIC, TBD, 50V, C0G/NP0, 0603	TDK	C1608C0G1H272J	Do Not Place
C25	CAP	0.1uF	±10%	C0603	Yes	Top	50V X7R Ceramic Capacitor	Murata	GRM188R71H104KA93D	FEC 8820023
C26	CAP	1uF	±10%	C0805	Yes	Top	CAPACITOR, 0805, 1UF, 50V, X7R	MURATA	GRM21BR71H105KA12L	FEC 1735541
C27	CAP	0.1uF	±10%	C0603	Yes	Top	50V X7R Ceramic Capacitor	Murata	GRM188R71H104KA93D	FEC 8820023
C28	CAP	0.1uF	±10%	C0603	Yes	Top	50V X7R Ceramic Capacitor	Murata	GRM188R71H104KA93D	FEC 8820023
C29	CAP	DNP	±5%	C0603	Yes	Top	CAPACITOR CERAMIC, TBD, 50V, C0G/NP0, 0603	TDK	C1608C0G1H272J	Do Not Place
C30	CAP	0.1uF	±10%	C0603	Yes	Top	50V X7R Ceramic Capacitor	Murata	GRM188R71H104KA93D	FEC 8820023
C31	CAP	0.1uF	±10%	C0603	Yes	Top	50V X7R Ceramic Capacitor	Murata	GRM188R71H104KA93D	FEC 8820023
C32	CAP	DNP	±5%	C0603	Yes	Top	CAPACITOR CERAMIC, TBD, 50V, C0G/NP0, 0603	TDK	C1608C0G1H272J	Do Not Place
C33	CAP	10pF	±5%	C0603	Yes	Top	CAP CERAMIC 10PF, 100V, C0G, 0603	AVX	06031A100JAT2A	FEC 1273324
C34	CAP	0.1uF	±10%	C0603	Yes	Top	50V X7R Ceramic Capacitor	Murata	GRM188R71H104KA93D	FEC 8820023
C35	CAP	2.7nF	±5%	C0603	Yes	Top	CAPACITOR CERAMIC, 2700PF, 50V, C0G/NP0, 0603	TDK	C1608C0G1H272J	FEC 1844178
C36	CAP	DNP	±5%	C0603	Yes	Top	CAPACITOR CERAMIC, TBD, 50V, C0G/NP0, 0603	TDK	C1608C0G1H272J	Do Not Place
C37	CAP	0.1uF	±10%	C0603	Yes	Top	50V X7R Ceramic Capacitor	Murata	GRM188R71H104KA93D	FEC 8820023
C38	CAP	DNP	±5%	C0603	Yes	Top	CAPACITOR CERAMIC, TBD, 50V, C0G/NP0, 0603	TDK	C1608C0G1H272J	Do Not Place
C39	CAP	DNP	±5%	C0603	Yes	Top	CAPACITOR CERAMIC, TBD, 50V, C0G/NP0, 0603	TDK	C1608C0G1H272J	Do Not Place
C40	CAP	22uF	±10%	1206	Yes	Top	CAPACITOR, 1206, X5R, 16V, 22UF	AVX	1206YD226KAT2A	FEC 1833822
C41	CAP	0.1uF	±10%	C0603	Yes	Top	50V X7R Ceramic Capacitor	Murata	GRM188R71H104KA93D	FEC 8820023
C42	CAP	0.1uF	±10%	C0603	Yes	Top	50V X7R Ceramic Capacitor	Murata	GRM188R71H104KA93D	FEC 8820023
C43	CAP	DNP	±5%	C0603	Yes	Top	CAPACITOR CERAMIC, TBD, 50V, C0G/NP0, 0603	TDK	C1608C0G1H272J	Do Not Place
C44	CAP	0.1uF	±10%	C0603	Yes	Top	50V X7R Ceramic Capacitor	Murata	GRM188R71H104KA93D	FEC 8820023

全部資料（壓縮包）下載：

ID:462629 · 發(fā)表于 2025-3-2 23:05

這個是多少位的

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AD7988-1 AD8641 ADR435 高達1kHz 低于奈奎斯特頻率輸入信號優(yōu)化的低功耗數(shù)據(jù)采集系統(tǒng)

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