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AD1879 Folha de dados(PDF) 5 Page - Analog Devices |
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AD1879 Folha de dados(HTML) 5 Page - Analog Devices |
5 / 16 page AD1878/AD1879 REV. 0 –5– DEFINITIONS Dynamic Range The ratio of a full-scale output signal to the integrated output noise in the passband (0 kHz to 20 kHz), expressed in decibels (dB). Dynamic range is measured with a –60 dB input signal and is equal to (S/[THD+N]) + 60 dB. Signal to (Noise + Distortion) The ratio of the root-mean-square (rms) value of the fundamen- tal input signal to the rms sum of all spectral components in the passband, expressed in decibels (dB). Signal to Total Harmonic Distortion (THD) The ratio of the rms sum of all harmonically related spectral components in the passband to the fundamental input signal, expressed either as a percentage (%) or in decibels (dB). Passband The region of the frequency spectrum unaffected by the attenu- ation of the digital decimator’s filter. Passband Ripple The peak-to-peak variation in amplitude response from equal amplitude input signal frequencies within the passband, ex- pressed in decibels. Stopband The region of the frequency spectrum attenuated by the digi- tal decimator’s filter to the degree specified by “stopband attenuation.” Gain Error With a near full-scale input, the ratio of actual output to ex- pected output, expressed as a percentage. Interchannel Gain Mismatch With near full-scale inputs, the ratio of outputs of the two stereo channels, expressed in decibels. Gain Drift Change in response to a near full-scale input with a change in temperature, expressed as parts-per-million (ppm) per °C. Midscale Offset Error Output response to a midscale input (i.e., zero volts dc), ex- pressed in least-significant bits (LSBs). Midscale Drift Change in midscale offset error with a change in temperature, expressed as parts-per-million (ppm) of full scale per °C. Crosstalk Ratio of response on one channel with a grounded input to a full-scale 1 kHz sine-wave input on the other channel, expressed in decibels. Interchannel Phase Deviation Difference in input sampling times between stereo channels, ex- pressed as a phase difference in degrees between 1 kHz inputs. Power Supply Rejection With analog inputs grounded, energy at the output when a 300 mV p-p signal is applied to power supply pins, expressed in decibels of full scale. Group Delay Intuitively, the time interval required for an input pulse to ap- pear at the converter’s output, expressed in milliseconds (ms). More precisely, the derivative of radian phase with respect to radian frequency at a given frequency. Group Delay Variation The difference in group delays at different input frequencies. Specified as the difference between largest and the smallest group delays in the passband, expressed in microseconds ( µs). AD1878/AD1879 PIN LIST Pin Input/Output Pin Name Description 11 I/O LRCK Left/Right Clock 12 I/O BCK Bit Clock 13 I S0 Mode Select 0 14 I 64/32 Bit Rate Select 15I DVDD +5 V Digital Supply 16 I DGND Digital Ground 17 N/C No Connection; Do Not Connect 18I AVSS1 –5 V Analog Supply 19I AVSS2 –5 V Analog Logic Supply 10 I AGND Analog Ground 11 I APD Analog Power Down 12 I VINR– Right Inverting Input 13 I VINR+ Right Noninverting Input 14 I/O REFR Right Reference Capacitor 15 I/O REFL Left Reference Capacitor 16 I VINL+ Left Noninverting Input 17 I VINL– Left Inverting Input 18 I AGND Analog Ground 19 I AVDD1 +5 V Analog Supply 20 I AVDD2 +5 V Analog Logic Supply 21 I AVSS1 –5 V Analog Supply 22 I DVDD +5 V Digital Supply 23 I DGND Digital Ground 24 I RESET Reset 25 I S1 Mode Select 1 26 I CLOCK Master Clock Input 27 O DATA Serial Data Output 28 I/O WCK Word Clock THEORY OF OPERATION ∑∆ Modulator Noise-Shaping The stereo, differential analog modulators of the AD1878/ AD1879 employ a proprietary feedforward and feedback archi- tecture that passes input signals in the audio band with a unity transfer function yet simultaneously shape the quantization noise generated by the one-bit comparator out of the audio band. See Figure 1. Without the ∑∆ architecture, this quantiza- tion noise would be spread uniformly from dc to one-half the oversampling frequency, 64 × F S. (Regardless of architecture, 64 times oversampling by itself significantly reduces the quanti- zation noise in the audio band if the input is properly dithered. However, the noise reduction is only [log2 64] × 3 dB = 18 dB.) PIN 1 0.580 (14.73) 0.485 (12.32) 1 14 15 2 8 0.625 (15.87) 0.600 (15.24) 0.015 (0.381) 0.008 (0.204) 0.195 (4.95) 0.125 (3.18) 0.250 (6.35) MAX 0.022 (0.558) 0.014 (0.356) 0.100 (2.54) BSC 0.200 (5.05) 0.125 (3.18) 0.070 (1.77) MAX 0.060 (1.52) 0.015 (0.38) 0.150 (3.81) MIN SEATING PLANE 1.565 (39.70) 1.380 (35.10) Figure 1. AD1878/AD1879 Modulator Noise-Shaper (One Channel) |
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