Please note this thread in diyaudio at http://www.diyaudio.com/forums/c ... ference-design.html . I have clearly explained the question “what is the difference between LM4562 and LME49720” at thread #60 on 1-August-2008. It was a direct communication between me and NS USA at that time. I repeat the answer as below:
What is the difference between LM4562 and LME49720? NS USA replied that there was no difference between LM4562 and LME49720 in which they were exactly the same chip in dual OPAMP version. NS further explained that LM4562 was released about 4-5 months prior to the whole family. Since some customers still place sales order into LM4562, rather than LME49720, thus NS still keep this number.
In summary, the following OPAMP chips are exactly the same, but difference in single, dual and quad version:
=> LME49710 (Single) with voltage feedback
=> LME49713 (Single) with current feedback
=> LM4562 (Dual)
=> LME49720 (Dual)
=> LME49730 (Quad)
Furthermore, you need to know the difference between LME49710 and LME49713. I have explained it as per thread #65 in diyaudio on 6-August-2008.
Check the price in HK$ as per Farnell Hong Kong by today, please note:
(MA/NA refers to ceramic package and HA refers to metal can package)
=> LME49710NA: HK$ 19.02/pc
=> LME49710HA: HK$ 141.90/pc
=> LME49713MA: HK$ 66.90/pc
=> LME49713HA: HK$ 193.85/pc (As per Digikey HK)
=> LM4562NA: HK$ 41.90/pc
=> LM4562HA: HK$ 142.30/pc
=> LME49720NA: HK$ 48.30/pc
=> LME49720HA: HK$ 199.00/pc
The final choice depends on your strategy. There are two strategies as below:
1) The lowest price strategy
=> Select ceramic package of LM4562NA at HK$ 41.90/pc
2) The best sound strategy
It is subject to individual person. By experience, metal can package sounds better than ceramic package. Furthermore, the current feedback mode sounds better than voltage feedback mode. For this reason, you have two choices:
Choice #1: metal can package sounds better than ceramic package.
=> Select metal can package of LM4562HA at cost HK$ 142.30/pc.
=> You just solder the metal can IC into a 8-DIP IC plug and insert into a 8-DIP IC socket on PCB.
Choice #2: the current feedback mode sounds better than voltage feedback mode.
=> Select metal can package of LME49713HA at cost HK$ 193.85/pc with current feedback mode.
=> Since LME49713HA is single version, you two pieces to replace LM4562 at total cost of HK$ 387.70. It is based on the assumption that cost is not a concern.
=> To achieve this goal, you need an IC converter of two-single to one-dual OPAMP 8-DIP plug. Then you solder two metal can package of LME49713HA into this plug and insert into 8-DIP socket on PCB.
In summary, you have three choices of LM4562NA at HK$ 41.90/pc, LM4562HA at cost HK$ 142.30/pc and LME49713HA at cost HK$ 387.70/set. It is a final compromise between me and NS USA at year of 2008.
Hope it help! |