AD7982 超低功耗、差分PulSAR ADC驱动电路 PCB+电路原理图+BOM表

电路使用超低功耗、18位1 MSPS ADC AD7982 ，由低功耗全差分放大器ADA4940-1来驱动。低噪声精密5.0V基准电压源 ADR395用于提供该ADC所需的5V电源。图1所示的所有IC均采用3 mm × 3 mm LFCSP或3 mm × 5 mm MSOP小型封装，从而有助于降低电路板成本和空间。

电路中ADA4940-1的功耗不到9 mW。18位1 MSPS AD7982 ADC的功耗仅7 mW （1 MSPS时），远低于市面上的同类ADC。此功耗也随吞吐量而变化。ADR395功耗仅为0.7mW，使系统总功耗低于17 mW。

电路原理图：




BOM表：

Part Type	Value	Ref. Desig	FootPrint	Type	ADI #	Vendor	Vendor #	Qty.
CAP CHIP	10 pF  100v  SMT	C34, C35	0805	NPO	4-8-48	Digi-Key	478-1278-1-ND	2
	100 pF  50v  SMT	C38	0805	NPO	4-8-2	Digi-Key	478-1316-1-ND	1
	2700 pF  50v  SMT	C39, C40	1206	NPO	4-5-150	Digi-Key	478-1497-1-ND	2
	.1uF  50v  SMT	C7, C10-C12,	0603	X7R	4-12-32	Digi-Key	445-1314-1-ND	13
		C15-C18, C48, C51,
		C54-C56
	.1uF  25v  SMT	C3, C5, C20, C22,	0805	X7R	4-5-43	Digi-Key	490-1673-1-ND	17
		C25, C27-C30, C31,
		C37, C42, C52,
		C53, C63, C69, C70
	1uF  16v  SMT	C6, C9, C33, C49,	0805	Y5V	4-8-23	Digi-Key	490-1739-1-ND	7
		C57, C58, C72
	10uF  16v  SMT	C32	0805	X5R	4-8-60	Digi-Key	490-3886-1-ND	1
	10uF  20v  SMT	C8, C13, C14,	2312	TANT	N/A	Digi-Key	399-3733-6-ND	6
		C21, C23, C24
RES CHIP	0 ohm Cer. SMT	R5, R38, R39, R53,	0805	5%	3-27-22	Digi-Key	P0.0ACT-ND	8
		R54, R61, R64, R75
	49.9 ohm Cer. SMT	R36	0603	1%	3-32-8	Digi-Key	P49.9HCT-ND	1
	49.9 ohm Cer. SMT	R3, R30, R31,	0805	1%	3-19-1	Digi-Key	P49.9CCT-ND	5
		R34, R42
	590 ohm Cer. SMT	R7, R10,	0805	1%	3-27-179	Digi-Key	P590CCT-ND	4
		R11, R29, R60
	1K ohm Cer. SMT	R12, R62	0603	1%	3-32-13	Digi-Key	P1.00KHCT-ND	2
	1K ohm Cer. SMT	R23, R58	0805	1%	3-19-8	Digi-Key	P1.00KCCT-ND	2
	10K ohm Cer. SMT	R8, R13-R15, R24	0603	1%	3-32-6	Digi-Key	P10.0KHCT-ND	12
		R26-R28, R32, R33,
		R40, R41
	10K ohm Cer. SMT	R4, R17, R19,	0805	1%	3-18-83	Digi-Key	P10.0KCCT-ND	5
		R21, R37
	47K ohm Cer. SMT	R22	0805	1%	3-27-169	Digi-Key	311-47.0KCRCT-ND	1
	60.4K ohm Cer. SMT	R56	0805	1%	3-27-109	Digi-Key	P60.4KCCT-ND	1
	95.3K ohm Cer. SMT	R76	0805	1%	N/A	Digi-Key	311-95.3KCRCT-ND	1
	127K ohm Cer. SMT	R77	0805	1%	3-27-202	Digi-Key	P127KCCT-ND	1
	294K ohm Cer. SMT	R55	0805	1%	N/A	Digi-Key	P294KCCT-ND	1

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