ADC14X250 datasheet(63/69 Pages) TI1

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ADC14X250

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SLASE49 – DECEMBER 2015

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Device Support (continued)

elastic buffer. This latency is specified to be deterministic if the JESD204B subclass 1 requirements

are satisfied.

SIGNAL-TO-NOISE RATIO (SNR) is the ratio, expressed in dB, of the power of the input signal to the total

power of all other spectral components, not including harmonics and DC. SNR is usually expressed

relative to the power of a possible full-scale sinusoid [dBFS] or relative to the power of the actual

input carrier signal [dBc].

SIGNAL-TO-NOISE AND DISTORTION (SINAD) is the ratio, expressed in dB, of the power of the input signal to

the total power of all of the other spectral components, including harmonics but excluding DC.

SINAD is usually expressed relative to the power of a possible full-scale sinusoid [dBFS] or relative

to the power of the actual input carrier signal [dBc].

NON-HD2/HD3 SPUR is the ratio, expressed in dB, of the power of the peak spurious signal to the power of the

input signal, where a spurious signal is any signal present in the output spectrum that is not present

at the input excluding the second and third harmonic distortion. This parameter is usually expressed

relative to the power of a possible full-scale sinusoid [dBFS] or relative to the power of the actual

input carrier signal [dBc].

SPURIOUS FREE DYNAMIC RANGE (SFDR) is the ratio, expressed in dB, of the input signal power to the

peak spurious signal power, where a spurious signal is any signal present in the output spectrum

that is not present at the input. SINAD is usually expressed relative to the power of a possible full-

scale sinusoid [dBFS] or relative to the power of the actual input carrier signal [dBc].

SECOND HARMONIC DISTORTION (2ND HARM or HD2) is the ratio, expressed in dB, of the power of the

input signal’s 2nd harmonic to the power of the input signal. HD2 is usually expressed relative to the

power of a possible full-scale sinusoid [dBFS] or relative to the power of the actual input carrier

signal [dBc].

THIRD HARMONIC DISTORTION (3RD HARM or HD3) is the ratio, expressed in dB, of the power of the input

signal’s 3rd harmonic to the power of the input signal. HD3 is usually expressed relative to the

power of a possible full-scale sinusoid [dBFS] or relative to the power of the actual input carrier

signal [dBc].

TOTAL HARMONIC DISTORTION (THD) is the ratio, expressed in dB, of the total power of the first eight

harmonics (HD2 through HD9) to the input signal power. THD is usually expressed relative to the

power of a possible full-scale sinusoid [dBFS] or relative to the power of the actual input carrier

signal [dBc].

12.1.1.2 JESD204B Definitions

DEVICE CLOCK is a master clock signal from which a device must generate its local frame and local multi-

frame clocks. For the ADC14X250 device, this refers to the signal at the CLKIN input.

FRAME

is a set of consecutive octets in which the position of each octet can be identified by references to a

frame alignment signal.

FRAME CLOCK is a signal used for sequencing frames or monitoring their alignment. For the ADC14X250

device, this clock is internally generated and is not externally accessible.

LINK (DATA LINK) is an assembly, consisting of parts of two devices and the interconnecting data circuit, that is

controlled by a long protocol enabling data to be transferred from a data source to a data sink. The

link includes portions of the ADC14X250 device (transmitter), FPGA or ASIC (receiver), and the

hardware that connects them.

LOCAL MULTI-FRAME CLOCK (LMFC) is a signal used for sequencing multi-frames or monitoring their

alignment. This clock is derived inside the ADC14X250 device from the device clock and used in

the implementation of the JESD204B link within the device.

MULTI-FRAME is a set of consecutive frames in which the position of each frame can be identified by reference

to a multi-frame alignment signal.

OCTET

is a group of eight adjacent binary digits, serving as the input to an 8B/10B encoder or the output of

an 8B/10B decoder.

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