ADS5463IPFPR datasheet(22/25 Pages) TI

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DEFINITION OF SPECIFICATIONS

SNR + 10log10

(2)

SINAD + 10log10

N ) PD

(3)

THD + 10log10

(4)

ADS5463

SLAS515 – NOVEMBER 2006

PSRR

measure

the

ability

reject

frequencies present on the power supply. The

injected frequency level is translated into dBFS, the

Analog Bandwidth

spur in the output FFT is measured in dBFS, and the

The analog input frequency at which the power of the

difference is the PSRR in dB. The measurement

fundamental is reduced by 3 dB with respect to the

calibrates out the benefit of the board supply

low-frequency value

decoupling capacitors.

Aperture Delay

Signal-to-Noise Ratio (SNR)

The delay in time between the rising edge of the

SNR is the ratio of the power of the fundamental (PS)

input sampling clock and the actual time at which the

to the noise floor power (PN), excluding the power at

sampling occurs

dc and in the first five harmonics.

Aperture Uncertainty (Jitter)

The sample-to-sample variation in aperture delay

Clock Pulse Duration/Duty Cycle

SNR is either given in units of dBc (dB to carrier)

The duty cycle of a clock signal is the ratio of the

when the absolute power of the fundamental is used

time the clock signal remains at a logic high (clock

as the reference, or dBFS (dB to full scale) when the

pulse duration) to the period of the clock signal,

power of the fundamental is extrapolated to the

expressed as a percentage.

converter’s full-scale range.

Differential Nonlinearity (DNL)

Signal-to-Noise and Distortion (SINAD)

An ideal ADC exhibits code transitions at analog

SINAD is the ratio of the power of the fundamental

input values spaced exactly 1 LSB apart. DNL is the

(PS) to the power of all the other spectral

deviation of any single step from this ideal value,

components including noise (PN) and distortion (PD),

measured in units of LSB.

but excluding dc.

Common-Mode Rejection Ratio (CMRR)

CMRR measures the ability to reject signals that are

presented to both analog inputs simultaneously. The

injected common-mode frequency level is translated

SINAD is either given in units of dBc (dB to carrier)

into dBFS, the spur in the output FFT is measured in

when the absolute power of the fundamental is used

dBFS, and the difference is the CMRR in dB.

as the reference, or dBFS (dB to full scale) when the

Effective Number of Bits (ENOB)

power of the fundamental is extrapolated to the

ENOB is a measure in units of bits of a converter's

converter’s full-scale range.

performance as compared to the theoretical limit

Temperature Drift

based on quantization noise

Temperature drift (with respect to gain error and

ENOB = (SINAD – 1.76)/6.02

offset error) specifies the change from the value at

Gain Error

the nominal temperature to the value at TMIN or TMAX.

Gain error is the deviation of the ADC actual input

It is computed as the maximum variation the

full-scale range from its ideal value, given as a

parameters

over

the

whole

temperature

range

percentage of the ideal input full-scale range.

divided by TMIN – TMAX.

Integral Nonlinearity (INL)

Total Harmonic Distortion (THD)

INL is the deviation of the ADC transfer function from

THD is the ratio of the power of the fundamental (PS)

a best-fit line determined by a least-squares curve fit

to the power of the first five harmonics (PD).

of that transfer function. The INL at each analog

input value is the difference between the actual

transfer function and this best-fit line, measured in

units of LSB.

THD is typically given in units of dBc (dB to carrier).

Offset Error

Two-Tone Intermodulation Distortion (IMD3)

Offset error is the deviation of output code from

IMD3 is the ratio of the power of the fundamental (at

mid-code

when

both

inputs

are

tied

frequencies f1, f2) to the power of the worst spectral

common-mode.

component at either frequency 2f1 – f2 or 2f2– f1).

Power-Supply Rejection Ratio (PSRR)

IMD3 is given in units of either dBc (dB to carrier)

when the absolute power of the fundamental is used

as the reference, or dBFS (dB to full scale) when the

power of the fundamental is extrapolated to the

converter’s full-scale range.

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