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问 推荐几种比较精准的基准源 答 1: 温度系数是非常重要的有时基于初始精度。ADI电压基准-------------

Part#	Vout	Initial Accuracy (%)	Ref Out TC (ppm/C)	0.1-10 Hz Noise (uV p-p)	Ref Output Current (mA)	Supply Voltage Range (V)	Temp Range(s)	Supply Current	Package	Price* (1000-4999)
AD588	10	0.01	1.5	6	10	Vdd-Vss = (Vout+2) to +36	-25 to +85, 0 to +70	10mA	DIP	$13.66
AD688	10	0.02	1.5	6	10	Vdd-Vss = (Vout+2) to 36	-40 to +85, -55 to +125	12mA	DIP, SOIC	$8.25
REF43	2.5	0.02	25	4	20	+4.5 to +40	-40 to +85	450uA	DIP, SOIC	$3.32
AD780	2.5	0.04	3	4	10	+4 to +36	-40 to +85, -55 to +125	1mA	DIP, SOIC	$3.80
ADR441	2.5	0.04	1	1.2	10	+3 to +18	-40 to +125	3.75mA	DIP, MSOP, SOIC	$2.65
ADR431	2.5	0.04	1	3.5	30	+4.5 to +18	-40 to +125	800uA	MSOP, SOIC	$2.65
ADR421	2.5	0.04	1	1.75	10	+4.5 to +18	-40 to +125	500uA	MSOP, SOIC	$2.54
ADR443	3	0.04	1	1.4	10	+3.5 to +18	-40 to +125	3.75mA	MSOP, SOIC	$2.65
ADR423	3	0.04	1	1	10	+5.0 to +18	-40 to +125	500uA	MSOP, SOIC	$2.54
ADR444	4.096	0.04	1	1.8	10	+4.6 to +18	-40 to +125	3.75mA	MSOP, SOIC	$2.65
ADR434	4.096	0.04	1	6.25	30	+6.1 to +18	-40 to +125	800uA	MSOP, SOIC	$2.65
ADR439	4.5	0.04	1	7.5	30	+6.5 to +18	-40 to +125	800uA	MSOP, SOIC	$2.65
ADR445	5	0.04	1	2.25	10	+5.5 to +18	-40 to +125	3.75mA	MSOP, SOIC	$2.65
ADR435	5	0.04	1	8	30	+7.0 to +18	-40 to +125	800uA	MSOP, SOIC	$2.65
ADR425	5	0.04	1	3.4	10	+7.0 to +18	-40 to +125	500uA	MSOP, SOIC	$2.54
AD586	5	0.04	2	4	10	+6.0 to +36	-55 to +125, 0 to +70	3mA	DIP, SOIC	$2.50
REF194	4.5	0.044	2	45	30	+4.6 to +15	-40 to +85	45uA	DIP, SOIC	$1.24
AD584	+2.5/+5/+7.5/+10 Prog	0.05	5	50	10	+4.5 to +30	-55 to +125, 0 to +70	1mA	DIP, TO-52	$2.74
AD581	10	0.05	5	40	10	+12 to +30	-55 to +125, 0 to +70	1mA	TO-52	$3.72
AD587	10	0.05	5	4	10	+13.5 to +36	-55 to +125, 0 to +70	4mA	DIP, SOIC	$2.29
ADR01	10	0.05	3	20	10	+12 to +40	-40 to +125, 0 to +70	1mA	SC70, SOIC, TSOT	$0.99
ADR440	2.048	0.05	1	1	10	+3 to +18	-40 to +125	3.75mA	DIP, MSOP, SOIC	$2.65
ADR420	2.048	0.05	1	1.75	10	+4.0 to +18	-40 to +125	500uA	MSOP, SOIC	$2.54
ADR430	2.048	0.05	1	3.5	30	+4.1 to +18	-40 to +125	800uA	MSOP, SOIC	$2.65
ADR433	3	0.05	1	3.75	30	+5.0 to +18	-40 to +125	800uA	MSOP, SOIC	$2.65
REF198	4.096	0.05	2	40	30	+3.4 to +15	-40 to +85	45uA	DIP, SOIC, TSSOP	$1.24
ADR02	5	0.06	3	10	10	+7.0 to +40	-40 to +125, 0 to +70	1mA	SC70, SOIC, SOT23, TSOT	$1.05
ADR293	5	0.06	3	15	5	+6.0 to +15	-40 to +125	15uA	SOIC, TSSOP	$1.99
ADR292	4.096	0.07	3	12	5	+4.5 to +18	-40 to +125	12uA	SOIC, TSSOP	$1.99
AD1580	1.2	0.08	50	5	n/a	n/a, shunt ref	-40 to +85	n/a	SC70, SOT23	$0.68
AD1582	2.5	0.08	50	70	5	+2.7 to +12	-40 to +125	70uA	SOT23	$0.69
ADR291	2.5	0.08	3	8	5	+3 to +15	-40 to +125	12uA	SOIC, TSSOP	$1.95
REF192	2.5	0.08	2	25	30	+2.6 to +15	-40 to +85	45uA	DIP, SOIC, TSSOP	$1.24
ADR365	5	0.08	9	12.8	5	+5.3 to +15	-40 to +125	190uA	TSOT	$0.77
REF191	2.048	0.1	2	20	30	+2.3 to +15	-40 to +85	45uA	DIP, SOIC	$1.24
ADR03	2.5	0.1	3	10	10	+4.5 to +40	-40 to +125	1mA	SC70, SOIC, TSOT	$1.05
ADR363	3	0.1	9	8.7	5	+3.3 to +15	-40 to +125	190uA	TSOT	$0.77
ADR06	3	0.1	3	10	10	+5 to +40	-40 to +125	0.65mA	SC70, SOIC, TSOT	$0.99
AD1583	3	0.1	50	85	5	+3.2 to +12	-40 to +125	70uA	SOT23	$0.66
ADR364	4.096	0.1	9	11	5	+4.4 to +15	-40 to +125	190uA	TSOT	$0.77
AD1584	4.096	0.1	50	110	5	+4.3 to +12	-40 to +125	70uA	SOT23	$0.66
AD1585	5	0.1	50	140	5	+5.2 to +12	-40 to +125	70uA	SOT23	$0.67
ADR395	5	0.1	9	8	5	+5.3 to +15	-40 to +125	120uA	TSOT	$0.77
ADR127	1.25	0.12	3	5	5	+2.7 to +18	-40 to +125	125uA	TSOT	$0.77
ADR121	2.5	0.12	3	10	5	+2.8 to +18	-40 to +125	125uA	TSOT	$0.77
ADR361	2.5	0.12	9	8.25	5	+2.8 to +15	-40 to +125	190uA	TSOT	$0.77
ADR392	4.096	0.12	9	7	5	+4.3 to +15	-40 to +125	120uA	TSOT	$0.77
ADR125	5	0.12	3	20	5	+5.3 to +18	-40 to +125	125uA	TSOT	$0.77
ADR366	3.3	0.125	9	9.3	5	+3.6 to +15	-40 to +125	190uA	TSOT	$0.77
ADR360	2.048	0.15	9	6.8	5	+2.35 to +15	-40 to +125	190uA	TSOT	$0.77
REF02	5	0.15	3	10	10	+7.0 to +40	-40 to +85, -55 to +125, 0 to +70	1.4mA	DIP, SOIC, TO-99	$1.09
ADR391	2.5	0.16	9	5	5	+2.8 to +18	-40 to +125	120uA	TSOT	$0.77
ADR390	2.048	0.19	9	5	5	+2.5 to +15	-40 to +125	120uA	TSOT	$0.77
ADR1500	1.2875	0.2	170	5	n/a	n/a, shunt reference	-40 to +85	n/a	SC70	**
ADR370	2.048	0.2	30	70	5	+2.3 to +15	-40 to +125	72uA	SOT23	$0.77
ADR520	2.048	0.2	40	14	n/a	n/a, shunt reference	-40 to +85	50uA	SC70, SOT23	$0.43
AD680	2.5	0.2	20	8	10	+4.5 to +36	-40 to +85, 0 to +70	250uA	DIP, SOIC, TO-92	$1.65
ADR525	2.5	0.2	40	14	n/a	n/a, shunt reference	-40 to +85	50uA	SC70, SOT23	$0.43
REF03	2.5	0.2	10	6	20	+4.5 to +33	-40 to +85	1.4mA	DIP, SOIC	$1.09
ADR530	3	0.2	40	16	n/a	n/a, shunt ref	-40 to +85	50uA	SC70, SOT23	$0.43
ADR540	4.096	0.2	40	18	n/a	n/a, shunt ref	-40 to +85	50uA	SC70, SOT23	$0.43
REF195	5	0.2	2	50	30	+5.1 to +15	-40 to +85	45uA	DIP, SOIC, TSSOP	$1.24
ADR550	5	0.2	40	18	n/a	n/a, shunt reference	-40 to +85	50uA	SC70, SOT23	$0.43
ADR380	2.048	0.24	5	5	5	+2.4 to +18	-40 to +85	120uA	SOT23	$0.90
ADR381	2.5	0.24	3	5	5	+2.8 to +18	-40 to +85	120uA	SOT23	$0.90
ADR318	1.8	0.27	5	5	5	+2.4 to +15	0 to +70	120uA	SOT23	$1.25
ADR512	1.2	0.3	60	4	n/a	n/a shunt ref	-40 to +85	n/a	SOT23	$0.41
REF01	10	0.3	3	30	10	+12 to +40	-40 to +85, -55 to +125	1.4mA	DIP, SOIC, TO-99	$1.09
REF196	3.3	0.3	10	33	30	+3.4 to +15	-40 to +85	45uA	SOIC, TSSOP	$1.24
REF193	3	0.33	10	30	30	+3.2 to +15	-40 to +85	45uA	SOIC	$1.24
ADR510	1.0	0.35	70	4	n/a	n/a, shunt ref	-40 to +85	n/a	SOT23	$0.67
ADR280	1.2	0.4	5	2.2	100	+2.4 to +6.0	-40 to +85	16uA	SC70, SOT23	$0.68
AD580	2.5	0.4	10	8	10	+4.5 to +30	-55 to +125, 0 to +70	1.5mA	TO-52	$2.40
AD589	1.2	1.2	10	5	n/a	n/a, Shunt Type Reference	-55 to +125, 0 to +70	50uA	Metal CAN, SOIC	$0.96

这个帖子很大，前后编辑时间不下一小时……  答 2: 能不能给点便宜谢这位大哥了，能不能推荐点便宜的啊，我一般是买不起AD的东西的 答 3: 便宜没好货，或者说很难找到好货^_^可以从设计上着手……
比如我看到过一个测量温度的电路，将基准电阻和铂电阻串联到一起，然后接到恒流源上，它们两端分别取出信号电压和基准电压，接到具有差分输入接口的AD上，这样一来，就对恒流源精度要求不高了，用几毛钱的TL431就可以满足要求了。