16位、100kSPS的单电源低功耗数据采集系统AD7988-1 ADA4841-1 AD8032 AD8031 ADR4525

ID:124161 · 发表于 2016-6-19 14:58

实物图：

大多数系统中，需要在性能与低功耗之间进行权衡。本电路设计的重点是考察部分权衡因素，同时在16位、100 kSPS数据采集系统中实现低功耗（8 mW，典型值）和高性能。
本电路使用 AD7988-1低功耗(350 μA) PulSAR®模数转换器(ADC)，该器件直接从 ADA4841-1 高性能、低电压、低功耗运算放大器驱动。选择该放大器是因为它具有极佳的动态性能，可采用单电源电压供电且提供轨到轨输出。此外，输入共模电压范围包括负供电轨。
AD7988-1 ADC需要2.4 V至5.1 V间的外部基准电压。本应用中，选择的基准电压是 ADR4525 精密2.5 V基准电压源。

电路原理图：

本电路的核心是 AD7988-1 16位、100 kSPS逐次逼近型ADC，采用VDD单电源供电。它内置一个低功耗、高速、16位采样ADC和一个多功能串行端口接口(SPI)。在CNV上升沿，该器件对IN+与IN-之间的模拟输入电压差进行采样，范围从0 V至REF。基准电压(REF)由外部提供，并且可以独立于电源电压(VDD)。

在为本电路笔记执行的实验中， AD7988-1 评估板与系统演示平台（SDP， EVAL-SDP-CB1Z）接口，ADC SPI兼容串行接口则连接到DSP SPORT接口。ADC SPI接口能够将几个ADC以菊花链形式连结到单三线式总线上。采用独立VIO电源引脚时，它与1.8 V、2.5 V、3 V或5 V逻辑兼容。

AD7988-1 采用10引脚MSOP或10引脚QFN (LFCSP)封装。为方便起见，该电路板采用MSOP封装。

ADC输入从 ADA4841-1单位增益稳定、低噪声和低失真、轨到轨输出放大器进行缓冲和驱动，该器件通常在1.1 mA的静态电流下工作。此放大器提供2.1 nV/√Hz的低宽带电压噪声和1.4 pA/√Hz的电流噪声，100 kHz时具有极佳的−105 dBc无杂散动态范围(SFDR)。为了在更低频率下保持低噪声环境，10 Hz时放大器具有7 nV/√Hz和13 pA/√Hz的低1/f噪声。

使 ADA4841-1非常适合单电源应用的主要特性是，它在该应用中可以采用单供电轨供电，同时将可负供电轨接地。放大器输出摆幅可以达到地电平的50 mV范围内，这是本应用可接受的值。请注意，输入共模电压范围从负供电轨扩展至正供电轨的1 V范围内。为容纳目标信号范围（0 V至2.5 V），必须提供1 V裕量；因此本电路中使用4 V供电轨。

ADA4841-1 采用6引脚SOT-23或8引脚SOIC封装。

本应用中使用的2.5 V基准电压源是 ADR4525 ，属于 ADR45xx 基准电压源系列，可以提供高精度、低功耗、低噪声，且具有±0.01%初始精度、极佳的温度稳定性和低输出噪声。 ADR4525 的低热致输出电压迟滞和低长期输出电压漂移提高了系统性能。700 μA的最大工作电流和500 mV的低压差（最大值）使该器件最适合便携式设备。
用于本电路中的三个产品的额定工作温度范围均为−40°C至+125°C全工业温度范围。

BOM表：

C1	CAP	0.1uF	±10%	C0603	Yes	Top	50V X7R Ceramic Capacitor	Murata	GRM188R71H104KA93D	FEC 8820023
C2	CAP	0.1uF	±10%	C0603	Yes	Top	50V X7R Ceramic Capacitor	Murata	GRM188R71H104KA93D	FEC 8820023
C3	CAP	10nF	±10%	C0603	Yes	Top	50V X7R Ceramic Capacitor	Murata	GRM188R71H103KA01D	FEC 1118178
C4	CAP	0.1uF	±10%	C0603	Yes	Top	50V X7R Ceramic Capacitor	Murata	GRM188R71H104KA93D	FEC 8820023
C5	CAP	0.1uF	±10%	C0603	Yes	Top	50V X7R Ceramic Capacitor	Murata	GRM188R71H104KA93D	FEC 8820023
C6	CAP	1uF	±10%	C0805	Yes	Top	CAPACITOR, 0805, 1UF, 50V, X7R	MURATA	GRM21BR71H105KA12L	FEC 1735541
C7	CAP	0.1uF	±10%	C0603	Yes	Top	50V X7R Ceramic Capacitor	MURATA	GRM188R71H104KA93D	FEC 8820023
C8	CAP	1uF	±10%	C0805	Yes	Top	CAPACITOR, 0805, 1UF, 50V, X7R	MURATA	GRM21BR71H105KA12L	FEC 1735541
C9	CAP+	10uF	±10%	RTAJ_B	Yes	Top	20V Tantalum Capacitor	AVX	TAJB106K020RNJ	FEC 197427
C10	CAP+	10uF	±10%	RTAJ_B	Yes	Top	20V Tantalum Capacitor	AVX	TAJB106K020RNJ	FEC 197427
C11	CAP+	10uF	±10%	RTAJ_B	Yes	Top	20V Tantalum Capacitor	AVX	TAJB106K020RNJ	FEC 197427
C12	CAP+	10uF	±10%	RTAJ_B	Yes	Top	20V Tantalum Capacitor	AVX	TAJB106K020RNJ	FEC 197427
C13	CAP	2.7nF	±5%	C0603	Yes	Top	CAPACITOR CERAMIC, 2700PF, 50V, C0G/NP0, 0603	TDK	C1608C0G1H272J	FEC 1844178
C14	CAP	10pF	±5%	C0603	Yes	Top	CAP CERAMIC 10PF, 100V, C0G, 0603	AVX	06031A100JAT2A	FEC 1273324
C15	CAP	0.1uF	±10%	C0603	Yes	Top	50V X7R Ceramic Capacitor	Murata	GRM188R71H104KA93D	FEC 8820023
C16	CAP	0.1uF	±10%	C0603	Yes	Top	50V X7R Ceramic Capacitor	Murata	GRM188R71H104KA93D	FEC 8820023
C17	CAP	0.1uF	±10%	C0603	Yes	Top	50V X7R Ceramic Capacitor	Murata	GRM188R71H104KA93D	FEC 8820023
C18	CAP	1uF	±10%	C0805	Yes	Top	CAPACITOR, 0805, 1UF, 50V, X7R	MURATA	GRM21BR71H105KA12L	FEC 1735541
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	0.1uF	±10%	C0603	Yes	Top	50V X7R Ceramic Capacitor	Murata	GRM188R71H104KA93D	FEC 8820023
C22	CAP	0.1uF	±10%	C0603	Yes	Top	50V X7R Ceramic Capacitor	Murata	GRM188R71H104KA93D	FEC 8820023
C23	CAP	0.1uF	±10%	C0603	Yes	Top	50V X7R Ceramic Capacitor	Murata	GRM188R71H104KA93D	FEC 8820023
C24	CAP	0.1uF	±10%	C0603	Yes	Top	50V X7R Ceramic Capacitor	Murata	GRM188R71H104KA93D	FEC 8820023
C25	CAP+	22uF	±10%	RTAJ_B	Yes	Top	20V Tantalum Capacitor	AVX	TAJB226K020RNJ	FEC 1135057
C26	CAP	DNI		C0603	Yes	Top	n/a	n/a	n/a	Do Not Place
C27	CAP	DNI		C0603	Yes	Top	n/a	n/a	n/a	Do Not Place
C28	CAP	DNI		C0603	Yes	Top	n/a	n/a	n/a	Do Not Place
C29	CAP	DNI		C0603	Yes	Top	n/a	n/a	n/a	Do Not Place
C30	CAP	DNI		C0603	Yes	Top	n/a	n/a	n/a	Do Not Place
C31	CAP	DNI	±5%	C0603	Yes	Top	CAPACITOR CERAMIC, TBD, 50V, C0G/NP0, 0603	TDK	C1608C0G1H272J	Do Not Place
C32	CAP	DNI	±5%	C0603	Yes	Top	CAPACITOR CERAMIC, TBD, 50V, C0G/NP0, 0603	TDK	C1608C0G1H272J	Do Not Place
C33	CAP	DNI	±5%	C0603	Yes	Top	CAPACITOR CERAMIC, TBD, 50V, C0G/NP0, 0603	TDK	C1608C0G1H272J	Do Not Place
C34	CAP	DNI	±5%	C0603	Yes	Top	CAPACITOR CERAMIC, TBD, 50V, C0G/NP0, 0603	TDK	C1608C0G1H272J	Do Not Place
C35	CAP	DNI	±5%	C0603	Yes	Top	CAPACITOR CERAMIC, TBD, 50V, C0G/NP0, 0603	TDK	C1608C0G1H272J	Do Not Place
C36	CAP	DNI	±5%	C0603	Yes	Top	CAPACITOR CERAMIC, TBD, 50V, C0G/NP0, 0603	TDK	C1608C0G1H272J	Do Not Place
C37	CAP	DNI	±5%	C0603	Yes	Top	CAPACITOR CERAMIC, TBD, 50V, C0G/NP0, 0603	TDK	C1608C0G1H272J	Do Not Place
C38	CAP	DNI	±5%	C0603	Yes	Top	CAPACITOR CERAMIC, TBD, 50V, C0G/NP0, 0603	TDK	C1608C0G1H272J	Do Not Place
C39	CAP	DNI	±5%	C0603	Yes	Top	CAPACITOR CERAMIC, TBD, 50V, C0G/NP0, 0603	TDK	C1608C0G1H272J	Do Not Place
C40	CAP	DNI	±5%	C0603	Yes	Top	CAPACITOR CERAMIC, TBD, 50V, C0G/NP0, 0603	TDK	C1608C0G1H272J	Do Not Place
C41	CAP	DNI	±5%	C0603	Yes	Top	CAPACITOR CERAMIC, TBD, 50V, C0G/NP0, 0603	TDK	C1608C0G1H272J	Do Not Place
C42	CAP	10nF	±10%	C0603	Yes	Top	50V X7R Ceramic Capacitor	Murata	GRM188R71H103KA01D	FEC 1118178
C43	CAP	150pF	±5%	C0805	Yes	Top	CAPACITOR, 0805, 150pF, 50V, COG/NPO	MULTICOMP	MCAA000332	FEC 1759205
C44	CAP	DNI	±10%	C0805	Yes	Top	CAPACITOR, 0805, 1UF, 50V, X7R	MURATA	GRM21BR71H105KA12L	Do Not Place
C45	CAP	10nF	±10%	C0603	Yes	Top	50V X7R Ceramic Capacitor	Murata	GRM188R71H103KA01D	FEC 1118178
C46	CAP	10nF	±10%	C0603	Yes	Top	50V X7R Ceramic Capacitor	Murata	GRM188R71H103KA01D	FEC 1118178
C47	CAP+	10uF	±10%	RTAJ_B	Yes	Top	20V Tantalum Capacitor	AVX	TAJB106K020R	FEC 197427
C48	CAP	1uF	±10%	C0805	Yes	Top	CAPACITOR, 0805, 1UF, 50V, X7R	MURATA	GRM21BR71H105KA12L	FEC 1735541
J1	CON\POWER4			CON\POWER4	No	Top	TERMINAL BLOCK, PCB, 4WAY	LUMBERG	KRM 04	FEC 1177877
J2	SDP-STANDARD-CONN			CON-120/FX8-120S-SV_W/S	No	Top	120-way connector, 0.6mm pitch	Hirose	FX8-120S-SV(21)	FEC 1324660
J3	SMB_JACK_RIGHT_ANGLED	N/A	N/A	SMB_JACK_RIGHT_ANGLED	No	Top	CONN SMB JACK R/A PC MNT GOLD	EMERSON	131-3701-301	Digikey J472-ND
J4	SMB_JACK_RIGHT_ANGLED	N/A	N/A	SMB_JACK_RIGHT_ANGLED	No	Top	CONN SMB JACK R/A PC MNT GOLD	EMERSON	131-3701-301	Digikey J472-ND
R1	RES	DNI	1%	R0603	Yes	Top	RESISTOR, 0603 TBD	MULTICOMP	MC 0.063W 0603 1% TBD	Do Not Place
R2	RES	49r9	0.01	R0805	Yes	Top	RESISTOR, 0805, 49R9, 0.1%, 0.125W	PANASONIC	ERA6AEB49R9V	FEC 1810372
R3	RES	0r	0.01	R0603	Yes	Top	SMD Resistor	Multicomp	MC 0.063W 0603 0R	FEC 9331662
R4	RES	49r9	0.01	R0805	Yes	Top	RESISTOR, 0805, 49R9, 0.1%, 0.125W	PANASONIC	ERA6AEB49R9V	FEC 1810372
R5	RES	10k	0.01	R0805	Yes	Top	THICK FILM CHIP RESISTOR	VISHAY DRALORIC	CRCW080510K0FKEAHP	FEC 1738972
R6	RES	10k	0.01	R0805	Yes	Top	THICK FILM CHIP RESISTOR	VISHAY DRALORIC	CRCW080510K0FKEAHP	FEC 1738972
R7	RES	DNI	1%	R0603	Yes	Top	RESISTOR, 0603 TBD	Multicomp	MC 0.063W 0603 1% TBD	Do Not Place
R8	RES	22R	0.01	R0805	Yes	Top	RESISTOR, 22R 1% 0805	Vishay Draloric	CRCW080522ROFKEAHP	FEC 1738936
R9	RES	0r	0.01	R0603	Yes	Top	SMD Resistor	Multicomp	MC 0.063W 0603 0R	FEC 9331662
R10	RES	0r	0.01	R0603	Yes	Top	SMD Resistor	Multicomp	MC 0.063W 0603 0R	FEC 9331662
R11	RES	DNI	1%	R0603	Yes	Top	SMD Resistor	Multicomp	MC 0.063W 0603 0R	Do Not Place
R12	RES	60k4	0.01	R0603	Yes	Top	RESISTOR, 0603 60K4	MULTICOMP	MC 0.063W 0603 1% 60K4	FEC 1170965
R13	RES	294k	0.01	R0603	Yes	Top	RESISTOR, 0603 294K	MULTICOMP	MC 0.063W 0603 1% 294K	FEC 1171030
R14	RES	100K	0.01	R0603	Yes	Top	SMD Resistor	Multicomp	MC 0.063W 0603 1% 100K	FEC 9330402
R15	RES	100K	0.01	R0603	Yes	Top	SMD Resistor	Multicomp	MC 0.063W 0603 1% 100K	FEC 9330402
R16	RES	0r	0.01	R0603	Yes	Top	SMD Resistor	Multicomp	MC 0.063W 0603 0R	FEC 9331662
R17	RES	0r	0.01	R0603	Yes	Top	SMD Resistor	Multicomp	MC 0.063W 0603 0R	FEC 9331662
R18	RES	0r	0.01	R0603	Yes	Top	SMD Resistor	Multicomp	MC 0.063W 0603 0R	FEC 9331662
R19	RES	DNI			Yes	Top				Do Not Place
R20	RES	DNI			Yes	Top				Do Not Place
R21	RES	DNI			Yes	Top				Do Not Place
R22	RES	10k	0.01	R0805	Yes	Top	THICK FILM CHIP RESISTOR	VISHAY DRALORIC	CRCW080510K0FKEAHP	FEC 1738972
R23	RES	10k	0.01	R0805	Yes	Top	THICK FILM CHIP RESISTOR	VISHAY DRALORIC	CRCW080510K0FKEAHP	FEC 1738972
R24	RES	82K	0.01	603	Yes	Top	RESISTOR, 0603 82K,0.063W,1%	MULTICOMP	MC 0.063W 0603 1% 82K	FEC 9331573
R25	RES	DNI			Yes	Top				Do Not Place
R26	RES	DNI	1%	R0603	Yes	Top	RESISTOR, 0603 TBD	MULTICOMP	MC 0.063W 0603 1% TBD	Do Not Place
R27	RES	DNI	1%	R0603	Yes	Top	RESISTOR, 0603 TBD	MULTICOMP	MC 0.063W 0603 1% TBD	Do Not Place
R28	RES	DNI	1%	R0603	Yes	Top	RESISTOR, 0603 TBD	MULTICOMP	MC 0.063W 0603 1% TBD	Do Not Place
R29	RES	DNI	1%	R0603	Yes	Top	RESISTOR, 0603 TBD	MULTICOMP	MC 0.063W 0603 1% TBD	Do Not Place
R30	RES0603	330k	5%	R0603	Yes	Top	RESISTOR, 0603 330K	MULTICOMP	MC 0.063W 0603 5% 330K	FEC 9332057
R31	RES	0r	0.01	R0603	Yes	Top	SMD Resistor	MULTICOMP	MC 0.063W 0603 0R	FEC 9331662
R32	RES	DNI	1%	R0603	Yes	Top	RESISTOR, 0603 TBD	MULTICOMP	MC 0.063W 0603 1% TBD	Do Not Place
R33	RES	0r	0.01	R0603	Yes	Top	SMD Resistor	MULTICOMP	MC 0.063W 0603 0R	FEC 9331662
SL1	JUMPER2\0603_BRIDGE			0603-3PIN_BRIDGE	Yes	Top	2-Way Shorting Option - Use 0r 0603 Resistor in Position "B"	Multicomp	MC 0.063W 0603 0r	FEC 933-1662
U1	NC7S08			SOT23-5	Yes	Top	Single AND Gate	Fairchild	NC7SZ085M	FEC 1013807
U2	24LC32A-I/MS			MSO8	Yes	Top	32K I2C Serial EEPROM, MSOP8	Microchip	24LC32A-I/MS	FEC 1331330
U3	NC7S08			SOT23-5	Yes	Top	Single AND Gate	Fairchild	NC7SZ085M	FEC 1013807
U4	NC7S08			SOT23-5	Yes	Top	Single AND Gate	Fairchild	NC7SZ085M	FEC 1013807
U5	NC7S04			SOT23-5	Yes	Top	Single INV	Fairchild	NC7SZ04	FEC 1013809
U6	ADR4525BRZ			SO8NB	Yes	Top		Analog Devices	ADR4525BRZ	ADR4525BRZ
U7	AD8032ARMZ			MSO8	Yes	Top	2.7 V, 800 μA, 80 MHz Rail-to-Rail I/O Dual Amplifier	Analog Devices	AD8032ARMZ	AD8032ARMZ
U8					Yes	Top				Do Not Place
U9	DNI (solder short needed between pads 1 and 8)				Yes	Top				DNI (solder short needed between pads 1 and 8)
U10	AD7988-1BRMZ			MSO10	Yes	Top	16-Bit, 1 MSPS PulSAR® ADC in MSOP	Analog Devices	AD7988-1BRMZ	AD7988-1BRMZ
U11					Yes	Top				Do Not Place
U12	ADA4841-1YRZ-R7			SO8NB	Yes	Top	Low Noise, High Speed Amplifier for 16-Bit Systems	Analog Devices	ADA4841-1YRZ-R7	ADA4841-1YRZ-R7
Screw1		**					SCREW, CHEESE, NYLON, M3X10, PK100	ALLTHREAD	119030010	FEC 7070597
Screw2		**					SCREW, CHEESE, NYLON, M3X10, PK100	ALLTHREAD	119030010	FEC 7070597
Nut1		**					NUT/WASHER, NYLON, M3, PK100	DURATOOL	1140030	FEC 7061857
Nut2		**					NUT/WASHER, NYLON, M3, PK100	DURATOOL	1140030	FEC 7061857

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16位、100kSPS的单电源低功耗数据采集系统AD7988-1 ADA4841-1 AD8032 AD8031 ADR4525

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