HMC1061LC5TR-R5 datasheet(12/18 Pages) AD

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HMC1061LC5

Data Sheet

Rev. B | Page 12 of 18

TERMINOLOGY

Aperture Delay

Aperture delay is the exact sample time relative to the time that

the hold command is applied to the device. Aperture delay is

the difference between the delay of the clock switching transition

to the hold node and the input signal group delay to the hold

node. If the input signal group delay to the hold node exceeds

the clock delay, this value is negative.

Aperture Jitter

Aperture jitter is the standard deviation of the sample instant in

time.

Acquisition Time

Acquisition time is the interval between the internal hold-to-

track transition and the time at which the hold node signal is

tracking the input signal within a specified accuracy. Acquisition

time does not include the pipeline delay of the clock buffer.

Differential Pedestal

Differential pedestal is a component in the sample value caused

by charge redistribution in the track-and-hold switch during

the sampling transition. In general, the pedestal can consist of

three components: a fixed offset, a component that is linearly

related to input signal amplitude, and a component that is

nonlinearly related to input signal amplitude. The majority of

the pedestal is usually linear. The value of the pedestal (P) can

be approximated by

P = PO + PLIN × VIN

where:

PO is the fixed pedestal component.

PLIN is the linear pedestal component.

VIN is the sampled signal level.

Differential Droop Rate

Differential droop rate is the slow drift in the differential output

voltage of a held sample while the track-and-hold amplifier is in

hold mode. Differential droop rate is typically caused by current

leakage on the hold capacitors and corresponds to a decay in the

held voltage with increasing time. The droop can be approximated

as the sum of a fixed component and a component that is linearly

related to the held sample voltage. The total droop (D) can be

approximated by

D = DO + DLIN × VIN

where:

DO is the fixed component.

DLIN is the linear droop constant.

VIN is the sampled signal level.

The sign of DO tends to be random so that only the magnitude

is specified. Because the droop is mostly linear, it causes little

nonlinearity.

Feedthrough Rejection

Feedthrough rejection is the measure of the off state (hold mode)

isolation of the track-and-hold internal switch. Feedthrough

rejection is defined as the ratio of the amplitude of the output

signal (for a sinusoidal input) feeding through during the hold

mode to the amplitude of the output signal during track mode.

Normalization by the track mode signal gives the true switch

isolation without the effects of the output amplifier bandwidth

limiting.

Full-Scale Range

Full-scale range is the voltage range between the minimum and

maximum signal levels that can be handled by the track-and-

hold amplifier while still meeting the device specifications.

Sampling Bandwidth

Sampling bandwidth is the −3 dB bandwidth of the sampled signal

levels and is represented by the held sample amplitudes. It includes

both the bandwidth of the transfer function from the signal input

to the hold node and any band limiting effects associated with

the finite time duration of the sampling aperture.

Settling Time

Settling time is the interval between the internal track hold

transition and the time at which the held output signal is settled

to within a specified accuracy. It does not include the pipeline

delay of the clock buffer and does include the group delay of the

output amplifier.

Spurious Free Dynamic Range (SFDR)

SFDR is the ratio (usually expressed in dB) between the sinu-

soidal output signal amplitude and the amplitude of the largest

non-linearity product falling within one Nyquist bandwidth. It

may be specified for both full-scale input and some fraction(s)

of full-scale input. A SFDR based only on second-order nonlinear

products is referred to as the second-order SFDR (SFDR2). A

SFDR based only on third-order products is referred to as the

third-order SFDR (SFDR3).

Total Harmonic Distortion (THD)

THD is the ratio of the total power in the nonlinearity generated

harmonics and harmonic (measured in one Nyquist band) to

the output signal power.

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