OPA604

想自己upgrade 部CD機op amp, 用緊OPA604, 可以有mug好嘅選擇?

1. Measure the voltage across GND to Pin 4, Pin 7.
2. If the Voltage is < 13V, KK suggest AD8610.

回復 2# kk_ho

唔好意思，打少左個字，用緊OPA2604....

1. Measure the voltage across GND to Pin 4, Pin 8.
2. If the Voltage is < 13V, KK suggest AD8620.
3. If over 13V, suggest NS LME4562

TI 上月買左成間NS，所以

1. Measure the voltage across GND to Pin 4, Pin 8.
2. If the Voltage is < 13V, KK suggest AD8620.
3 ...
kk_ho 發表於 2011-5-13 08:14

樓主，唔該晒，請問邊到地方容易買到！新仔一名!!

You need LM4562 or AD8620?

You need LM4562 or AD8620?
kk_ho 發表於 2011-5-13 10:56

唔該KK, 剛剛度完，電壓係15V，我唸要用LM4562. 另外，睇到隻LME49720, 同4562差唔多，有什麼不同？

Use LME49720 la. The spec is same. But the sound quality is diff.

Use LME49720 la. The spec is same. But the sound quality is diff.

where I can buy it? thx


- 發送自我的 iPhone 大板凳應用

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!

回復 11# alant

Thanks to all C-hing suggestion. In fact, I have just got 1 pair of LME49720 today and install for my CDP

Comparing with OPA2604, more details, warm and tube feeling, but, I feel it a little bit slow pacing. Is there any choice that I can also try to test? prefer more faster

thx

回復  alant

Thanks to all C-hing suggestion. In fact, I have just got 1 pair of LME49720 today and ...
hellowe 發表於 2011-5-13 23:30

Assuming your LME49720 is ceramic package of LME49720NA (8-DIP), then metal can package of either LM4562HA or LME49720HA may sounds better and feel speedy. Just a matter of paying more money to play different toys. For example, just like to compare pure silver interconnect cable to copper cable, high audio grade pure silver sounds better and speedy than copper cable in particularly at high frequency. It is only my personal viewpoint, but may not guarantee to satisfy you need.

Assuming your LME49720 is ceramic package of LME49720NA (8-DIP), then metal can package of either  ...
alant 發表於 2011-5-13 23:55

Already, it is a metal can package. So, I just wonder any choice that I can try to play....

Within National Semiconductors LME-series, you may taste different sound from single version OPAMP chips LME49710 with voltage feedback mode and LME49713 with current feedback mode. Seldom people recommend you to do this, except me. Personally, current feedback mode sounds better than voltage feedback mode as well as metal can package sounds better than plastic resin encapsulated package. Apart from National Semiconductor, there is a lot of choice for OPAMP including his major competitors TI’s Burr Brown OPA-series and Analog Devices AD-series, plus many new suppliers entry into this market. (Remark: TI has just acquired NS already)