# LTC5564: Vout voltage swing

On page 10 of the datasheet, the output swing of the high speed amplifier is noted as "approximately 295mV to VCC – 1.6V". However for instance on page 6, in the figure "VOUT vs Input Power 10GHz", Vout is shown to increase up to ~4600mV, which seems to conflict with the VCC-1.6V statement.

What is the actual range of Vout ( for VCC=3.3V and for VCC=5.0V)?

## Top Replies

Parents
• Hi mvgalen,

Sorry about late response on this.

The page 6 graph, response at 10GHz, is based on actual measurements of multiple parts with Vcc= 5V, as stated on the graph. It is correct, with the understanding that there will always be part-to-part variation which is inherent to the semiconductor mass-production process.

The (Vcc - 1.6V) limitation happens at lower values of Vcc, as noted on datasheet page 3: Vout Output Voltage Swing for Supply Voltage = 3V is specified as 1.4V min.

Hope that helps answer your question.

-Bruce

• Hi Bruce,

Thanks for your answer.

Do I assume correctly that the 1.6V @ Vcc=3.0V limitation then reduces linearly to ~0.4V @ Vcc=5.0V? Meaning that the maximum Vout voltage at Vcc=3.3V is about 1.8V?

Cheers,

Marijn

• Hi Marijn,

Yes, your extrapolation theory will be roughly correct. Understand that we do not have data to show how linear (or non-linear) that curve might be. It seems safe to assume that the max VOUT for Vcc=3.3V should be around 1.8V, as you calculate.  -Bruce

Reply
• Hi Marijn,

Yes, your extrapolation theory will be roughly correct. Understand that we do not have data to show how linear (or non-linear) that curve might be. It seems safe to assume that the max VOUT for Vcc=3.3V should be around 1.8V, as you calculate.  -Bruce

Children
No Data