高阻抗、高CMR、±10 V模擬前端信號(hào)調(diào)理 PCB圖+電路原理圖+bom表

ID:124161 · 發(fā)表于 2016-6-14 20:06

PCB樣板：

該電路是一個(gè)完整的模擬前端，它利用一個(gè)16位差分輸入PulSAR? ADC對(duì)±10 V工業(yè)級(jí)信號(hào)進(jìn)行數(shù)字轉(zhuǎn)換。該電路僅利用兩個(gè)模擬器件，來(lái)提供一路具有高共模抑制(CMR)性能的高阻抗儀表放大器輸入、電平轉(zhuǎn)換、衰減和差分轉(zhuǎn)換功能。由于具有高集成度，該電路可節(jié)省印刷電路板空間，為常見的工業(yè)應(yīng)用提供高性價(jià)比解決方案。

在過(guò)程控制和工業(yè)自動(dòng)化系統(tǒng)中，典型的信號(hào)電平最高可達(dá)±10 V。而來(lái)自熱電偶和稱重傳感器等傳感器的信號(hào)輸入則較小，因此常常會(huì)遇到大共模電壓擺幅，這就需要靈活的模擬輸入，它能以高共模抑制性能處理大小差分信號(hào)，同時(shí)具有高阻抗輸入。

用現(xiàn)代低壓ADC處理工業(yè)級(jí)信號(hào)時(shí)，必須進(jìn)行衰減和電平轉(zhuǎn)換。此外，全差分輸入ADC具有以下優(yōu)勢(shì)：良好的共模抑制性能，更少的二階失真產(chǎn)物，以及簡(jiǎn)化的直流調(diào)整算法。因此，工業(yè)信號(hào)需要經(jīng)過(guò)進(jìn)一步調(diào)理才能與差分輸入ADC正確接口。

電路原理圖采用ad8295：

bom表：

Quantity	Reference Designator(s)	Descriptions	Value	Package Type	Manufacturer	Manufacturer Part Number	PRTNUM_49
1	U3	16-Bit, 1.5 LSB INL, 250 kSPS PulSAR™ Differential ADC		RM-10	Analog Devices	AD7687BRMZ	30-025996-01
1	U2	G = 0.2, Level Translation, 16-Bit ADC Driver		RM-8	Analog Devices	AD8275BRMZ	30-025997-01
1	U1	Precision Instrumentation Amplifier with Signal Processing Amplifiers		CP-16-19-D	Analog Devices	AD8295BCPZ	30-025998-01
1	U4	IC ADP3336 ADJ 500mA LDO ADI		RM-8	Analog Devices	ADP3336ARMZ	30-025190-01
1	U5	Ultralow Noise XFET Voltage References with Current Sink and Source Capability		RM-8	Analog Devices	ADR431ARMZ	30-025999-01
4	B1-4	B0805 300ohm@100MHz 2A BLM21PG331SN1D MURATA	330@100MHz	0805	MURATA	BLM21PG331SN1D	7000692
9	C1-3 C5-7 C9 C16 C20	C0603 0.1uF 25V GRM188R71E104KA01D Murata	0.1uF	0603	Murata	GRM188R71E104KA01D	7000767
1	C8	C0603 1.5nF 50V GRM188R71H152KA01D Murata	1.5nF	0603	Murata	GRM188R71H152KA01D	7000917
2	C19 C22	C0603 100pF 50V 06035A101JAT2A AVX	100pF	0603	AVX	06035A101JAT2A	7000405
1	C24	C0603 1nF 50V X7R0603HTTD102J KOA	1nF	0603	KOA	X7R0603HTTD102J	7000406
1	C21	C0603 470pF 50V 06033A471JAT2A AVX	470pF	0603	AVX	06033A471JAT2A	7000352
2	C10-11	C0805 10uF 10V GRM21BR61A106KE19L MURATA	10uF	0805	MURATA	GRM21BR61A106KE19L	7000461
2	C13-14	C0805 1uF 25V ECJ-2VB1E104K PANASONIC	1uF	0805	PANASONIC	ECJ-2VB1E104K	7000758
1	C4	C1206 22uF 6.3V C2012X7R0J226K TDK	22uF	1206	TDK	C2012X7R0J226K	7000630
3	C12 C15 C17-18	C1206 10uF 25V YAGEO	10uF	1206	YAGEO	CC1206ZKY5V8BB106	7000900
3	F1-3	CAP 3T C-Type Chip EMIFIL CKD510JB1A105ST 10V TDK	1uF	EMIF3TC_0805		CKD510JB1A105ST	7000901
1	J5	SDP Connector		CON_120PIN_SMD	Hirose	FX8-120S-SV(21)	6000923
2	D1-2	Schottky Diode BAT54S 200mA 30V DIODES INC		SOT23	DIODES INC	BAT54S	7000899
1	U7	IC EEPROM I2C Bus 32K 24LC32A-I/SN MICROCHIP	32K	SOIC8	MICROCHIP	24LC32A-I/SN	1000614
1	U8	IC 74HC1G125GW NXP	74HC1G125GW	SOT353-1	NXP	74HC1G125GW	1000628
1	J4	3Pin 2.54mm 22-03-2031 MOLEX		SIP-3P	MOLEX	22-03-2031	6000964
3	JP1-3	3Pin 2.54mm 22-03-2031 MOLEX		SIP-3P	MOLEX	22-03-2031	6000964
3	PS1-3	Polyswitch NANOSMDC035F 350mA 30V TYCO	NANOSMDC035F	1206	Tyco	NANOSMDC035F	6000972
2	R10 R12	R0603 100K 5% 1/10W 100ppm CRCW0603100KJNEA VASHAY	100K	0603	VASHAY	CRCW0603100KJNEA	7000367
2	R6-7	R0603 10K 1% 1/10W RC0603FR-0710KL YAGEO	10K	0603	YAGEO	RC0603FR-0710KL	7000401
1	R31	R0603 210K 1% 1/10W 100ppm ERJ-3EKF2103V PANASONIC	210K	0603	PANASONIC	ERJ-3EKF2103V	7000771
7	R4-5 R13-17	R0603 33 1% 1/10W 100ppm CRCW060333R0FKEA VISHAY	33	0603	VISHAY	CRCW060333R0FKEA	7000415
1	R8	R0603 64.9K 1% 63mW 100ppm ERJ-3EKF6492V PANASONIC	64.9K	0603	PANASONIC	ERJ-3EKF6492V	7000772
2	R1-2	R0805 1.5K 1% 100mW 100ppm CRCW08051K50FKEA VIshay	1.5K	0805	VIshay	CRCW08051K50FKEA	7000050
1	R11	SURFACE MOUNT RESISTOR 0.031 X 0.061 INCHES, 1/10W	NP	0603	IPC SM-782 STD.
1	R3	SURFACE MOUNT RESISTOR 0.048 X 0.079 INCHES	NP	0805	IPC SM-782 STD.
3	D3-5	Diode SBR2U30P1-7 Vf:0.5V@2A If:2A DIODES INC	SBR2U30P1-7	DIODE_S	DIODES INC	SBR2U30P1-7	7000782
2	J1-2	Terminal, 5.08mm, 2 Way		2P_200_45	MULTICOMP	MC24356	6000968
1	J3	Screw Terminal MC24357 5.08mm 180(D) Multicomp		CON\5.08\3P	Multicomp	MC24357	6000969
18	+15VA -15VA A1V25 A2V5 AGND D5V D6V DGND MISO SCL SCLK SDA SPI_SEL TP6-10	Test Point Hole 60*40(mil)		TP40
5	TVS1-5	TVS SMBJ30CA 600W FAIRCHILD		DO-214AA	BOURNS	SMBJ30CA	7000907

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高阻抗、高CMR、±10 V模擬前端信號(hào)調(diào)理 PCB圖+電路原理圖+bom表

高阻抗、高CMR、±10 V模擬前端信號(hào)調(diào)理 PCB圖+電路原理圖+bom表