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ADS7881IPFBT Arkusz danych(PDF) 1 Page - Burr-Brown (TI) |
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ADS7881IPFBT Arkusz danych(HTML) 1 Page - Burr-Brown (TI) |
1 / 31 page ADS7881 SLAS400B − SEPTEMBER 2003 − REVISED NOVEMBER 2005 12BIT, 4MSPS LOW POWER SAR ANALOGTODIGITAL CONVERTER FEATURES D 4 MHz Sample Rate, 12-Bit Resolution D Zero Latency D Unipolar, Pseudo Differential Input, Range: − 0 V to 2.5 V D High Speed Parallel Interface D 71 dB SNR and −88.5 dB THD at 1 MHz I/P D Power Dissipation 95 mW at 4 MSPS D Nap Mode (10 mW Power Dissipation) D Power Down (10 mW) D Internal Reference D Internal Reference Buffer D 48-Pin TQFP and QFN Packages APPLICATIONS D Optical Networking (DWDM, MEMS Based Switching) D Spectrum Analyzers D High Speed Data Acquisition Systems D High Speed Close-Loop Systems D Telecommunication D Ultra-Sound Detection DESCRIPTION The ADS7881 is a 12-bit 4-MSPS A-to-D converter with 2.5-V internal reference. The device includes a capacitor based SAR A/D converter with inherent sample and hold. The device offers a 12-bit parallel interface with an additional byte mode that provides easy interface with 8-bit processors. The device has a pseudo-differential input stage. The −IN swing of ±200 mV is useful to compensate for ground voltage mismatch between the ADC and sensor and also to cancel common-mode noise. With nap mode enabled, the device operates at lower power when used at lower conversion rates. The device is available in 48-pin TQFP and QFN packages. _ + SAR Output Latches and 3-State Drivers BYTE 12/8-Bit Parallel Data Output Bus Conversion and Control Logic CONVST BUSY CS RD A_PWD PWD/RST CDAC Comparator CLOCK 2.5 V Internal Reference +IN −IN REFIN REFOUT PRODUCTION DATA information is current as of publication date. Products conform to specifications per the terms of Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters. Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet. Copyright 2003 − 2005, Texas Instruments Incorporated |
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