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AD1877JR

製品説明
仕様・特性

a 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-Times Oversampling ⌺⌬ Modulator Three-Stage, Linear-Phase Decimator 256 ؋ F S or 384 ؋ F S 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 Electronic Equipment Sampling Music Synthesizers Digital Karaoke Systems Single-Supply 16-Bit ⌺⌬ Stereo ADC AD1877 FUNCTIONAL BLOCK DIAGRAM CLOCK DIVIDER 28 CLKIN 2 27 TAG BCLK 3 26 SOUT DVDD1 4 25 DVDD2 DGND1 5 RDEDGE 6 LRCK 1 WCLK SERIAL OUTPUT INTERFACE THREE-STAGE FIR DECIMATION FILTER THREE-STAGE FIR DECIMATION FILTER 24 DGND2 23 D A C D A C D A C RESET 22 D A C MSBDLY S/M 7 384/256 8 21 RLJUST AVDD 9 20 AGND VINL 10 19 VINR CAPL1 11 18 CAPR1 17 CAPR2 16 AGNDR 15 VREFR CAPL2 12 AGNDL 13 VREFL 14 SINGLE TO DIFFERENTIAL INPUT CONVERTER SINGLE TO DIFFERENTIAL INPUT CONVERTER VOLTAGE REFERENCE AD1877 PRODUCT OVERVIEW The AD1877 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 onchip 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 AD1877 accepts a 256 × F S 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 × F S onto internally buffered switched-capacitors, eliminating external sample-and-hold amplifiers 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 AD1877’s internal differential architecture provides increased dynamic range and excellent power supply rejection characteristics. The AD1877’s proprietary fourth-order differential switched-capacitor ∑∆ modulator architecture shapes the one-bit comparator’s quantization noise out of the audio passband. The high order of the modulator randomizes the modulator output, reducing idle tones in the AD1877 to very low levels. Because its modulator is single-bit, AD1877 is inherently monotonic and has no mechanism for producing differential linearity errors. The input section of the AD1877 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 AD1877 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 stopband attenuation exceeds 90 dB. (Continued on Page 6) REV. A I 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 which 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 World Wide Web Site: http://www.analog.com Fax: 781/326-8703 © Analog Devices, Inc., 2000

ブランド

AD

会社名

Analog Devices

本社国名

U.S.A

事業概要

半導体デバイスを製造するアメリカの多国籍企業。特にADC、DAC、MEMS、DSPなどに強い。現在は 65nm から 3μm のプロセスルールの回路を設計している。

供給状況

 
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