OPA2340: OPA4234U

SUGANYA R

Prodigy 70 points

Part Number: OPA2340
Other Parts Discussed in Thread: OPA4205, DAC8822

The OPA4234U is TI part which is obselete now. Kindly send the LTSPICE model for this part for design analysis

9 months ago

0 SUGANYA R 9 months ago

Prodigy 70 points

kindly send the SPICE model for OPA4234U

0 Michael Hartshorne 9 months ago in reply to SUGANYA R

TI__Genius 12425 points

Hello,

Sorry but once a device goes obsolete, we no longer support any of the simulation models. I recommend looking into an amplifier like the OPA4205 as a next generation replacement.

Regards,
Mike

0 SUGANYA R 9 months ago in reply to Michael Hartshorne

Prodigy 70 points

This is the existing DAC circuit using the OPA4234U.

Kindly help me out ( with circuit diagram & simulation ) on how could we replace this existing circuit with the next generation amplifier OPA4205.

0 Michael Hartshorne 9 months ago in reply to SUGANYA R

TI__Genius 12425 points

Hello,

We can help with a sim. but we don't provide sims. with other supplier's devices. If you'd like I can see if we have a DAC that can replace AD7564? Also, we don't have the supply voltages, can you tell us what the supply voltage is?

Regards,
Mike

0 SUGANYA R 9 months ago in reply to Michael Hartshorne

Prodigy 70 points

Ok..kindly check for an alternate DAC and help out for sim. Supply voltage for DAC is +5V.

0 Michael Hartshorne 9 months ago in reply to SUGANYA R

TI__Genius 12425 points

Suganya,

What are the supply voltages for the amplifiers? We need to know both the positive and negative rails. If it is 5V and GND, then I will have to change the recommendation of OPA4205.

Regards,
Mike

0 SUGANYA R 9 months ago in reply to Michael Hartshorne

Prodigy 70 points

The supply voltage for OPA4234U amplifier is +15V and -15V.

0 Paul_Frost 9 months ago in reply to SUGANYA R

TI__Guru 53573 points

I recommend using the DAC8822 built into TINA as an example of a comparable MDAC in this application.

0 Alex Curtis 9 months ago in reply to Paul_Frost

TI__Intellectual 1690 points

Hi Suganya,

With a supply voltage of +/- 15V, the OPA4205 is a great option. Regarding the DAC, I agree with Paul that the DAC8822 is a good replacement.

I replicated your circuit in TINA and put the model of the DAC8822 in a macro block. I also set the filter cap (C1) to 5 pF and moved the 200-ohm Riso outside of the feedback network to improve stability.

E2E_DAC8822.TSC

Best,

Alex

0 SUGANYA R 9 months ago in reply to Alex Curtis

Prodigy 70 points

Hi Alex,

I need to do AC analysis for this circuit. Kindly help me out on where to insert the AC component and do analysis in this circuit

0 Alex Curtis 9 months ago in reply to SUGANYA R

TI__Intellectual 1690 points

Hey Suganya,

To analyze the closed loop response of the circuit with respect to Vref, I added a voltage input above the DC source and ran the AC transfer characteristic. E2E_DAC8822_Acl.TSC

From the resulting bode plot, the closed loop system appears to have a bandwidth of around 600 kHz.

Regards,

Alex

Because of the holidays, TI E2E™ design support forum responses will be delayed from Dec. 25 through Jan. 2. Thank you for your patience.

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OPA2340: OPA4234U