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LTC2321-16

232116fc

For more information www.linear.com/LTC2321-16

applicaTions inForMaTion

Total Harmonic Distortion (THD)

Total harmonic distortion (THD) is the ratio of the

RMS sum of all harmonics of the input signal to the

fundamental itself. The out-of-band harmonics alias into

the frequency band between DC and half the sampling

frequency (fSMPL/2). THD is expressed as:

THD=20log

V22 +V32 +V42 +…+VN

where V1 is the RMS amplitude of the fundamental

frequency and V2 through VN are the amplitudes of the

second through Nth harmonics.

POWER CONSIDERATIONS

The LTC2321-16 requires two power supplies: the 5V

power supply (VDD), and the digital input/output interface

power supply (OVDD). The flexible OVDD supply allows

the LTC2321-16 to communicate with any digital logic

operating between 1.8V and 2.5V. When using LVDS I/O,

the OVDD supply must be set to 2.5V.

Power Supply Sequencing

The LTC2321-16 does not have any specific power sup-

ply sequencing requirements. Care should be taken to

adhere to the maximum voltage relationships described

in the Absolute Maximum Ratings section. The LTC2321-

16 has a power-on-reset (POR) circuit that will reset the

LTC2321-16 at initial power-up or whenever the power

supply voltage drops below 2V. Once the supply voltage

re-enters the nominal supply voltage range, the POR will

reinitialize the ADC. No conversions should be initiated

until 10ms after a POR event to ensure the reinitialization

period has ended. Any conversions initiated before this

time will produce invalid results.

Figure 17. Power Supply Current of the LTC2321-16 Versus Sampling Rate

SAMPLE RATE (Msps)

8.0

11.5

12.0

10.5

11.0

9.5

10.0

8.5

9.0

232116 F17

0.5

1.5

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