New Op Amps from NS

[trunkmonkey]

Two new op amp families for high-end audio applications from National Semiconductor set new standards for performance. The ±17 V/34 V LME497xx (single, dual, and quad versions available) family and the ±22 V/44 V LME49860 dual device offer extremely low distortion, low noise, high speed, and high output drive. High-performance devices are needed in audio systems, where the serial string of amplifiers in a signal path will contribute cumulative deficiencies, usually analyzed via worst-case or root-sum-square error budgets.


In addition to the 0.00003% THD+N (total harmonic distortion plus noise) specification , the op amps come with voltage noise of just 2.7 nV/root-Hz and current noise of 1.2 pA/root-Hz at 1 kHz. Input bias current is also low, at 10 nA. Output current is up to 26 mA (44 V devices) and 45 mA (34 V devices), and the amplifiers can handle 600 Ù loads. Gain bandwidth product of 55 MHz, 1/f noise corner at 60 Hz, and slew rate of 20 V/ìsec round out the key specifications. PSRR and CMRR are 120 dB.

 

[DcibeL]

LME497x is the LM456x.

 

[lineup]

😎

LME49860 as mentioned in first post is a real killer!
The absolute max Supply Voltage is 2 x 23 Volt. Recommended is max 2 x 22 Volt.

Very good data for audio.
==========================================
Input bias current: 10 nA (max 72 nA)
Input noise: 2.7 nV/Hz
Slewrate: 20 V/uS
GainBW: 55 MHz
PSRR & CMRR: better than 120 dB

Data at +- 22 Volt.
==========================================
Maximum input Voltage: +21.0 / -20.8
Maximum output Voltage: +21.0 / -21.0 (into 2 kOhm)
Maximum output Current: 30 mA (minimum into 600 Ohm)
==========================================

I prefer to use SINGLE Op-Amps. The single version is LME49870
Product pages with Datasheets:
http://www.national.com/pf/LM/LME49860.html
http://www.national.com/pf/LM/LME49870.html

PS.
I downloaded the spice model for LME49860 (same for LME49870)
I ran some circuit tests.
The results corresponds rather well with figures found in datasheets.
Like maximum Output Current/Voltage and Gain BandWidth
So, I would say, it is a useful spice model.

LME49860 Spice ZIP-file
http://www.national.com/models/spice/audio/LME49860.zip


Regards, Lineup

 

[lineup]

Two new op amp families for high-end audio applications from National Semiconductor set new standards for performance. The ±17 V/34 V LME497xx (single, dual, and quad versions available) family and the ±22 V/44 V LME49860 dual device offer extremely low distortion, low noise, high speed, and high output drive.

trunkmonkey
So, how would you say LME49870 compares to e.g. AD797?
What I can see it is better on a number of data figures.
Maybe better retire the AD797 as top of the line Op-Amp for audio.
It has had its best day.

Now things envolve.
Evolution takes place.

.. for the times
they are a'changin'
you better start swimming .. or you'll sink like a stone
.. for the times
they are a'changin'

(Bob Dylan USA 196x)

 

[dotneck335]

Well, the AD797 still outdoes the LM49870 in terms of equivalent input noise, by nearly 3 to 1. So AD797's is still king in high circuits!