SPT7722

www.fairchildsemi.com SPT7722 8-bit, 250 MSPS A/D Converter with Demuxed Outputs Features • • • • • • • • • TTL/CMOS/PECL input logic compatible High conversion rate: 250 MSPS Single +5V power supply Very low power dissipation: 425mW 350 MHz full power bandwidth Power-down mode: 24mW +3.0V/+5.0V (LVCMOS) digital output logic compatibility Single/demuxed output ports selectable Improved replacement for AD9054 Description The SPT7722 is a high-speed, 8-bit analog-to-digital converter implemented in an advanced BiCMOS process. It is a performance-enhanced version of the SPT7721, offering better linearity and dynamic performance. An advanced folding and interpolating architecture provides both a high conversion rate and very low power dissipation of only 425mW. The analog inputs can be operated in either single-ended or differential input mode. A 2.5V common mode reference is provided on chip for the single-ended input mode to minimize external components. The SPT7722 digital outputs are demuxed (double-wide) with both dual-channel and single-channel selectable output modes. Demuxed mode supports either parallel aligned or interleaved data output. The output logic is both +3.0V and +5.0V compatible. The SPT7722 is available in a 44-lead TQFP surface mount package over the industrial temperature range of -40°C to +85°C. Applications • • • • • RGB video processing Digital communications High-speed instrumentation Digital Sampling Oscilloscopes (DSO) Projection display systems Block Diagram AGND DGND AVCC OVDD VIN+ VIN– 8-Bit 250 MSPS ADC CLK CLK Data Output Latches DA0–DA7 DB0–DB7 Common Mode Voltage Reference Data Output Mode Control 2 2 DCLKOUT DCLKOUT +2.5 V VCM PD CLK CLK Reset DMODE1,2 & Reset Rev. 1.0.2 December 2002 DATA SHEET SPT7722 Absolute Maximum Ratings Parameter Supply Voltages AVCC OVDD Input Voltages Analog Inputs Digital Inputs Temperature Operating Temperature Storage Temperature (beyond which damage may occur)1 25°C Min. Max. +6 +6 -0.5 -0.5 -40 -65 VCC +0.5 VCC +0.5 +85 +125 Unit V V V V °C °C Note: 1. Operation at any absolute maximum rating is not implied. See Electrical Specifications table for proper nominal applied conditions in typical applications. Electrical Specifications (TA = TMin to TMax, AVCC= +5V, OVDD = +5V, ƒclk = 250MHz, 50% duty cycle, ƒIN = 70MHz, dual channel mode; unless otherwise noted) Parameter Resolution DC Performance (ƒIN = 1kHz) Differential Linearity Error (DLE) Integral Linearity Error (ILE) No Missing Codes @250 MSPS Analog Input Input Voltage Range Input Common Mode (VCM) Input Bias Current Input Resistance Input Capacitance Input Bandwidth Gain Error Offset Error Offset Power Supply Rejection Ratio Timing Characteristics Conversion Rate Output Delay (Clock-to-Data) (tpd1) Output Delay Tempco Aperture Delay Time (tap) Aperture Jitter Time Conditions Test Level Min. Typ. 8 +25°C -40°C to +85°C +25°C -40°C to +85°C VI IV VI IV VI V IV V V V V VI VI V IV IV V V V -0.68 -0.95 ±0.4 ±0.7 ±1.2 ±1.4 Guaranteed ±512 2.5 13 50 5 350 0.68 0.95 ±1.90 ±2.15 Max. Unit bits LSB LSB LSB LSB with respect to VIN+25°C +25°C +25°C +25°C (–3 dB of FS) +25°C +25°C AVCC = 5V ±0.25V 2.0 3.0 -7.5 -5