High Speed Digital-to-Analog Converters Glossary Adjacent Channel

The Datasheet Archive - 100 Million Datasheets from 7500 Manufacturers.

High Speed Digital-to-Analog Converters Glossary Adjacent Channel

Datasheet Thumbnail

Top Searches for this datasheet

Data Converters: High Speed Digital-to-Analog Converters Glossary
High Speed Digital-to-Analog Converters Glossary
Adjacent Channel Leakage Ratio (ACLR) ratio between measured power within channel relative adjacent channel. Adjacent Channel Power Ratio (ACPR) ACLR. Carrier Noise Ratio (CNR) measured relative modulated carrier; defined specific frequency band depending transmission standard. Clock Pulse Width (Latch Pulse Width) minimum amount time that Clock pulse should left logic state achieve rated performance. Complex Image Rejection traditional two-part upconversion, images created around second frequency. These images redundant have effect wasting transmitter power system bandwidth. placing real part second complex modulator series with first complex modulator, either upper lower frequency image near second rejected. Complex Modulation process passing real imaginary components signal through complex modulator (transfer function jsin realizing real imaginary components modulator output. Crosstalk Coupling onto channel producing level (-40 dBFS) signal when adjacent interfering channel producing full-scale signal. Differential Nonlinearity (DNL)
Data Converters: High Speed Digital-to-Analog Converters Glossary
measure variation analog value, normalized full scale, associated with change digital input code. Digital Analog Converter (DAC, Converter) device that changes digitally coded word into "equivalent" quantized analog voltage current. Dynamic Range ratio maximum output signal smallest output signal that processed system. Usually expressed logarithmically Dynamic range specified terms harmonic distortion, signal-to-noise ratio, spurious-free dynamic range, other performance criteria. Effective Number Bits (ENOB) effective number bits (ENOB) calculated from measured based equation:
Page
Fast Fourier Transform (FFT) computationally efficient mathematical technique that converts digital information from time domain frequency domain rapid spectral analysis. FFTs generally "time weighting" function compensate data records with non-integer number samples; some popular weighting functions Hanning Window 4-term Blackman-Harris. Gain Error difference between actual ideal output span. actual span determined output when inputs "1", minus output when inputs "0". Gain Matching multichannel converter, difference between largest gain smallest gain, expressed Glitch Impulse Asymmetrical switching times give rise undesired output transients that quantified glitch impulse. specified area glitch pV-s.
Data Converters: High Speed Digital-to-Analog Converters Glossary
Harmonic frequency that integer multiple fundamental. Harmonic Distortion, Second (HD2) ratio signal amplitude value second harmonic component, reported dBc. Harmonic Distortion, Third (HD3) ratio signal amplitude value third harmonic component, reported dBc. Hold Time (tH) amount time required digital inputs remain static after rising clock edge. Impulse Response Response device digital impulse applied input. Typically used characterize interpolation filters. Integral Nonlinearity (INL) maximum deviation actual analog output from ideal output, determined straight line drawn from zero full scale. Interpolation Filter (FIR, IIR) digital inputs sampled multiple rate fDATA (interpolation rate), digital filter constructed that sharp transition band near fDATA/2. Images that would typically appear around fDAC (output data rate) greatly suppressed. Jitter (Clock Jitter) Variation time sampling edge clock signal. Clock jitter become limiting factor achievable Intermediate Frequencies. Least Significant (LSB)
Page
Data Converters: High Speed Digital-to-Analog Converters Glossary
digital input data converter code that smallest weight. smallest output change that realized. Voltage Differential Signaling (LVDS) Standard defined ANSI/TIA/EIA-644 IEEE 1596.3. Monotonicity converter monotonic output either increases remains constant input increases. Most Significant (MSB) digital input data converter code that greatest weight, equal where number bits. Multitone Power Ratio (MTPR) spurious free dynamic range containing multiple carrier tones equal amplitude. measured difference between amplitude carrier tone peak spurious signal region removed tone. Noise power spectral density (NPSD) NSD. Noise spectral density (NSD) integrated output noise normalized bandwidth. Nyquist Theory This theory says that continuous bandwidth-limited signal contains frequency components higher than then original signal recovered without distortion sampled rate least Offset Binary Natural binary code which code represents analog values between +FS. code 0000. 0000 corresponds -FS.
Page
Data Converters: High Speed Digital-to-Analog Converters Glossary
Offset Error deviation analog output from ideal "0". Output Compliance Range range allowable voltage output current output DAC. Operation beyond maximum compliance limits cause either output stage saturation breakdown resulting nonlinear performance. Output Propagation Delay (tPD) delay between point rising clock edge differential crossing CLK+ CLK-) time when output reaches final value. Over Sampling Synthesis output frequency sampling rate above that which Nyquist theorem would dictate. Pass Band Frequency band which input applied therein passes unattenuated output. Phase Noise Frequency representation time-based jitter, typically expressed noise spectral density specific offset frequency from carrier. Positive Emitter Coupled Logic (PECL) (Emitter Coupled Logic) device biased positive power supply voltage. Power Supply Rejection Ratio (PSRR) maximum change full-scale output supplies varied from minimum maximum specified voltages, typically expressed %FSR/V. Quantization mathematical operation truncating decimal value arbitrary precision fixed binary resolution. Quantization Noise
Page
Data Converters: High Speed Digital-to-Analog Converters Glossary
Noise generated output errors created quantization process. Reconstruction Filter analog filter used attenuate image frequencies found output. Resolution Number bits representing analog signal generally ranging from higher number bits, higher resolution converter. Generally more accurate too. Sample Rate (MSPS) number conversions second producing. Settling Time time required output reach remain within specified error band about final value, measured from start output transition. Setup Time (tSU) amount time required digital inputs remain static prior rising clock edge. Signal Noise Distortion (SINAD) ratio signal amplitude value other spectral components, including harmonics excluding Signal Noise Ratio (SNR) ratio value measured output signal other spectral components below Nyquist frequency, excluding first harmonics value expressed decibels. Spurious Free Dynamic Range (SFDR) ratio signal amplitude value peak spurious spectral component, over specified bandwidth. peak spurious component harmonic. also reported (i.e., degrades signal level lowered) dBFS (i.e., always related back converter full scale). Stop-Band Rejection
Page
Data Converters: High Speed Digital-to-Analog Converters Glossary
amount attenuation frequency outside pass band applied DAC, relative full-scale signal applied input within pass band. Temperature Drift Temperature drift specified maximum change from ambient (25°C) value value either TMIN TMAX. offset gain drift, drift reported full-scale range (FSR) reference drift, drift reported Total Harmonic Distortion (THD) ratio first harmonic components value measured fundamental. expressed percentage decibels (dB). Tone Intermodulation Distortion (IMD) ratio value either input tone value worst third order intermodulation product; reported dBc. Tone SFDR ratio value either input tone value peak spurious component. peak spurious component product. also reported (i.e., degrades signal level lowered) dBFS (i.e., always relates back converter full scale). Twos Complement Bipolar binary code which positive negative codes same magnitude zeros plus carry. twos complement obtained complementing offset binary code.
Page

High Speed Digital-to-Analog Converters Glossary Adjacent Channel

Top Searches for this datasheet

Other recent searches