ADC-100 RANGE VIDEO FRONT-END MODULES The ADC-100 range converts analogue video in various formats to 10 or 12 bit parallel digital video. The range provides a complete front end solution for the digitising of high quality component, composite or s-video. The module incorporates a tightly specified anti-aliasing filter, an A-D converter and a digital filter all on a board measuring no more than 1044mm2 (1.65sq in). Features Typical applications • ± 5V operation • High impedance input stage • Filtered and buffered video o/p • User just provides pixel clock and clamp pulse • Choice of 10 or 12 bit A-D • Matched digital delay Y,Pb/Pr units • Video Broadcast and studio equipment • Digital Cameras • Telecommunications equipment • Video Frame Grabber Cards for PCs • Closed Circuit Security (to eliminate additional delay lines) ADC-100 BLOCK DIAGRAM © Faraday Technology. As part of continual product improvement the specifications, details and dimensions shown in this publication are subject to change without notice Fara064d.doc Page 1 of 5 Apr-01(E) Technical Description The ADC-100 range of modules are a complete front end solution for digitising analogue video. They comprise all buffering and filtering components required - allowing the user to connect directly to the video source. A dc clamp is provided to ensure that the black level is accurately set before being presented to the A-D converter. The modules utilise 2x oversampling to minimise the size of the filter components and achieve high performance. The subsequent data is decimated by high performance low pass digital filters to provide output data with standard sampling rates. All this is achieved transparently to the user; the only control signals required are a back porch clamp signal, a sync pulse to align the digital filter and an appropriate clock. For further details of the digital filter functionality consult Fairchild datasheet TMC2242. Typical I/P circuit for minimal tilt Fara064d.doc Page 2 of 5 Apr-01(E) Specification High Spec. analogue filter Analogue Filter Passband Analogue Filter Start of Stopband Analogue Filter Stopband rejection Analogue Filter Group delay ripple Differential gain Differential phase Supply current Relaxed analogue filter Analogue Filter Passband Analogue Filter Start of Stopband Analogue Filter Stopband rejection Analogue Filter Group delay ripple Differential gain Differential phase Supply current ADC-100, ADC-101, ADC-120, ADC-122 6.0 MHz with ripple of ± 0.05 dB. 21.0 MHz 45 dB < 3 ns to 3.58 MHz < 10 ns to 6.0 MHz 1% typical 1° typical + 300 mA +5v 20 mA -5v ADC-121 2.75 MHz with ripple of ± 0.05 dB. 10.5 MHz 45 dB < 6 ns to 1.64 MHz < 20 ns to 2.75 MHz 1% typical 1° typical + 300 mA +5v 20 mA -5v ADC-110R, ADC-111R, 6.0 MHz with ripple of ± 0.1 dB. 21.0 MHz 35 dB < 3 ns to 3.58 MHz < 16 ns to 6.0 MHz 1.5% typical 1.5° typical + 300 mA +5v 20 mA -5v Digital Filter details Filter Type Passband Attenuation at 0.25 fs Stopband attenuation Data latency ADC-100, ADC-101, ADC-110, ADC-111, ADC-120, ADC-121 TMC2242A ± 0.01 dB to 0.22 fs - 6 dB > 59 dB from 0.28 fs 34 clk periods ADC-122 TMC2242C ± 0.014 dB to 0.22 fs - 6 dB > 56 dB from 0.29 fs 68 clk periods Note: The ADC-122R uses the TMC2242C digital filter which features a double delay mode enabling the luminance module (fs = 27 MHz) to output data synchronously with the colour difference modules (fs = 13.5 MHz). This eliminates the need for a digital delay of the luminance data by 34 clock cycles. For further information consult Fairchild datasheet TMC2242C. An absolute delay difference of 37 ns exists between the ADC-122R and ADC-121R due to the differences in the analogue filters. Fara064d.doc Page 3 of 5 Apr-01(E) Module Details Order Code Gain Comments Application 1.6 1.6 Black Level 230 230 ADC-100R ADC-100B MMC Equivalent FE-100H10-1 FE-100H12-1 10-bit 12-bit ADC-101R ADC-101B 1.6 1.6 512 512 10-bit 12-bit Composite, Luminance (S-video), digital video decoder front end. High performance applications. fs = 27 MHz Chrominance , digital video decoder front end. High performance applications. fs = 27 MHz ADC-110R 1.6 230 1.6 230 Composite, Luminance (S-video), digital video decoder front end. fs = 27 MHz Chrominance , digital video decoder front end fs = 27 MHz FE-100M-1 ADC-111R 10-bit relaxed filter 10-bit relaxed filter ADC-120R 2.475 64 2.475 512 Y input (Component Video) , Expanded active video range. fs = 27 MHz Pb,Pr input (Component video), Expanded active video range. fs =13.5 MHz not available ADC-121R ADC-122R 2.475 64 10-bit CCIR-601-2 levels 10-bit CCIR-601-2 levels 2.75 MHz Filter 10-bit CCIR-601-2 levels Double delay Y input (Component Video) , Expanded active video range. fs = 27 MHz Matched digital filter delay. not available FE-100H10-2 FE-100H12-2 FE-100M-2 not available Note: PROVISIONAL DATA The modules are fitted with a high performance 10-bit analogue to digital converter as standard (Rsuffix) but they are also available with a 12-bit analogue converter (B suffix) Devices are normally supplied with a Fairchild half band filter. The units can be optionally supplied with other compatible half band filters, or with no digital filter at the customers request. Application Notes The ADC modules incorporate a clamp circuit which must be fed with a back porch signal derived on the users pcb. This can easily be generated using standard sync separators. The user has control over digital filter inputs DEC_N, OE_N and SYNC appropriately. These inputs allow the user to synchronise the decimation of pixel data and multiplex the outputs from modules. For further details the user should consult the Fairchild datasheet TMC2242. The insertion delay difference between the component modules ADC122R and ADC121R can be eliminated by latching the Luminance data for 1 clock cycle within the application. Note: This product is Aqueous Washable. Fara064d.doc Page 4 of 5 Apr-01(E) Faraday Technology Ltd. Croft Road Industrial Estate, Newcastle, Staffordshire Fara064d.doc ST5 0QZ. England. Page 5 of 5 Tel: Fax: Email: Web site: + 44 (0)1782 661501 + 44 (0)1782 630101 [email protected] Apr-01(E) http://www.faradaytech.co.uk