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AD1870 데이터시트(PDF) 1 Page - Analog Devices |
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AD1870 데이터시트(HTML) 1 Page - Analog Devices |
1 / 20 page FUNCTIONAL BLOCK DIAGRAM 1 2 3 4 5 6 7 8 9 10 11 12 13 14 28 27 26 25 24 23 22 21 20 19 18 17 16 15 L RCK WCLK BCLK DGND1 DVDD1 RDEDGE S/ M 384/ 256 AVDD VINL CAPL1 CAPL2 AGNDL VREFL CLKIN TAG SOUT DVDD2 RESET MSBDLY R LJUST AGND VINR CAPR1 CAPR2 AGNDR VREFR SERIAL OUTPUT INTERFACE THREE-STAGE FIR DECIMATION FILTER DGND2 THREE-STAGE FIR DECIMATION FILTER CLOCK DIVIDER VOLTAGE REFERENCE DAC SINGLE-TO- DIFFERENTIAL INPUT CONVERTER SINGLE-TO- DIFFERENTIAL INPUT CONVERTER AD1870 DAC DAC DAC REV. 0 a Single-Supply 16-Bit - Stereo ADC FEATURES Single 5 V Power Supply Single-Ended Dual-Channel Analog Inputs 92 dB (Typ) Dynamic Range 90 dB (Typ) S/(THD + N) 0.006 dB Decimator Passband Ripple Fourth-Order, 64 Oversampling - Modulator Three-Stage, Linear-Phase Decimator 256 fS or 384 fS Input Clock Less than 100 W (Typ) Power-Down Mode Input Overrange Indication On-Chip Voltage Reference Flexible Serial Output Interface 28-Lead SOIC Package APPLICATIONS Consumer Digital Audio Receivers Digital Audio Recorders, Including Portables CD-R, DCC, MD, and DAT Multimedia and Consumer Electronics Equipment Sampling Music Synthesizers AD1870* one-bit comparator’s quantization noise out of the audio pass- band. The high order of the modulator randomizes the modulator output, reducing idle tones in the AD1870 to very low levels. Because its modulator is single-bit, the AD1870 is inherently monotonic and has no mechanism for producing differential linearity errors. The input section of the AD1870 uses autocalibration to correct any dc offset voltage present in the circuit, provided that the inputs are ac-coupled. The single-ended dc input voltage can swing between 0.7 V and 3.8 V typically. The AD1870 antialias input circuit requires four external 470 pF NPO ceramic chip filter capacitors, two for each channel. No active electronics are needed. Decoupling capacitors for the supply and reference pins are also required. The dual digital decimation filters are triple-stage, finite impulse response filters for effectively removing the modulator’s high frequency quantization noise and reducing the 64 × fS single-bit output data rate to an fS word rate. They provide linear phase and a narrow transition band that properly digitizes 20 kHz signals at a 44.1 kHz sampling frequency. Passband ripple is less than 0.006 dB, and stop band attenuation exceeds 90 dB. (Continued on Page 7) Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781/329-4700 www.analog.com Fax: 781/326-8703 © Analog Devices, Inc., 2001 PRODUCT OVERVIEW The AD1870 is a stereo, 16-bit oversampling ADC based on sigma-delta ( ∑-∆) technology intended primarily for digital audio bandwidth applications requiring a single 5 V power supply. Each single-ended channel consists of a fourth-order one-bit noise shaping modulator and a digital decimation filter. An on- chip voltage reference, stable over temperature and time, defines the full-scale range for both channels. Digital output data from both channels are time-multiplexed to a single, flexible serial interface. The AD1870 accepts a 256 × fS or a 384 × fS input clock (fS is the sampling frequency) and operates in both serial port “master” and “slave” modes. In slave mode, all clocks must be externally derived from a common source. Input signals are sampled at 64 × fS onto internally buffered switched-capacitors, eliminating external sample-and-hold ampli- fiers and minimizing the requirements for antialias filtering at the input. With simplified antialiasing, linear phase can be preserved across the passband. The on-chip single-ended to differential signal converters save the board designer from having to provide them externally. The AD1870’s internal differential architecture provides increased dynamic range and excellent power supply rejection characteristics. The AD1870’s proprietary fourth-order differen- tial switched-capacitor ∑-∆ modulator architecture shapes the *Protected by U.S. Patent Numbers 5055843, 5126653; others pending. |
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