LMH6551: Frequency response : gain = 2~10

user5163865

Genius 3485 points

Part Number: LMH6551
Other Parts Discussed in Thread: THS4500, THS4505

Hi,

D/S Figure 3 shows Gain = 1, could you provide similar data with Gain = 2 to 10 to our customers ?

Best regards,

Hiroshi

over 3 years ago

0 SimaJalaleddine over 3 years ago

TI__Mastermind 24135 points

Hello Hiroshi-san,

I would suggest using LMH6551 Pspice Model for simulating the frequency response of this device for higher gains. With higher gains, the AC peaking will reduce which will also lead to a decrease in the bandwidth.

I am looking into any internal testing we might have done for this device at higher gains, and will get back to you shortly.

Thank you,
Sima

0 SimaJalaleddine over 3 years ago

TI__Mastermind 24135 points

Hello Hiroshi-san,

Unfortunately, I could not find testing available on the device at higher gains. From this e2e thread, the gain bandwidth product of the device is around 200MHz, so an estimate for gains of 2 to 10 would result to a system bandwidth of around 67MHz to 19MHz.

Thank you,

Sima

0 kai klaas69 over 3 years ago in reply to SimaJalaleddine

Guru 140200 points

Hi Sima,

a bandwidth of 1GHz for a 370MHz OPAmp? The model of LMH6551 doesn't seem to work properly:

user_lmh6551.TSC

Kai

0 Michael Steffes over 3 years ago

Guru 48395 points

Since the LMH6551 model seems suspect, there are other TI +/-5V capable FDA's to consider - the THS4500 to THS4505 might fit your needs as well.

0 user5163865 over 3 years ago in reply to SimaJalaleddine

Genius 3485 points

Hi TI team,

Thank you for your kind support.
I understand that the simulation model does not work properly.
I also report to the customer that there is no actual measurement data.

Best regards,

Hiroshi

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LMH6551: Frequency response : gain = 2~10