SPT7721

SPT7721 8-BIT, 250 MSPS ADC WITH DEMUXED OUTPUTS TECHNICAL DATA NOVEMBER 8, 2001 FEATURES • TTL/CMOS/PECL compatible • High conversion rate: 250 MSPS • Single +5 V power supply • Very low power dissipation: 310 mW • Power-down mode • +3.0 V/+5.0 V (LVCMOS) digital output logic compatibility • Demuxed output por ts APPLICATIONS • RGB video processing • Digital communications • High-speed instrumentation • Projection display systems GENERAL DESCRIPTION The SPT7721 is a high-speed, 8-bit analog-to-digital conver ter implemented in an advanced BiCMOS process. An advanced folding and inter polating architecture provides both a high conversion rate and ver y low power dissipation of only 310 mW. The analog inputs can be operated in either single-ended or differential input mode. A 2.5 V common mode reference is provided on chip for the singleended input mode to minimize external components. The SPT7721 digital outputs are demuxed (double-wide) with both dual-channel and single-channel selectable output modes. Demuxed mode suppor ts either parallel aligned or interleaved data output. The output logic is both +3.0 V and +5.0 V compatible. The SPT7721 is available in a 44-lead TQFP surface mount package over the industrial temperature range of –40 to +85 °C. 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 ABSOLUTE MAXIMUM RATINGS (Beyond which damage may occur) 25 °C Supply Voltages AVCC ...................................................................... +6 V OVDD ..................................................................... +6 V Input Voltages Analog Inputs ............................... –0.5 V to VCC +0.5 V Digital Inputs ................................ –0.5 V to VCC +0.5 V Temperatures Operating Temperature ........................... –40 to +85 °C Storage Temperature ............................ –65 to +125 °C Note: Operation at any Absolute Maximum Rating is not implied. See Electrical Specifications for proper applied conditions in typical applications. ELECTRICAL SPECIFICATIONS TA = TMIN to TMAX, AVCC = +5.0 V, ƒCLK = 250 MHz, VCM = 2.5 V, OVDD = 5.0 V, unless otherwise specified. PARAMETERS Resolution DC Performance Differential Linearity Error (DLE) Integral Linearity Error (ILE) Best Fit No Missing Codes Analog Input Input Voltage Range (with respect to VIN–) Gain Variation Input Common Mode (VCM) Input Bias Current Input Resistance Input Capacitance Input Bandwidth Offset Error Offset Power Supply Rejection Ratio Timing Characteristics Maximum Conversion Rate Output Delay (Clock-to-Data) (tpd1) Output Delay Tempco Aperture Delay Time (tap) Aperture Jitter Time Pipeline Delay (Latency) Single Channel Mode Demuxed Interleaved Mode Demuxed Parallel Mode Channel B Channel A CLK to DCLKOUT Delay Time Single Channel Mode (tpd2) Dual Channel Mode (tpd3) Dynamic Performance Effective Number of Bits (ENOB) ƒIN = 70 MHz ƒIN = 70 MHz Signal-to-Noise Ratio (SNR) ƒIN = 70 MHz ƒIN = 70 MHz TEST CONDITIONS TEST LEVEL MIN SPT7721 TYP 8 MAX UNITS Bits LSB LSB LSB LSB ƒIN = 1 kHz +25 °C –40 °C to +85 °C +25 °C –40 °C to +85 °C +25 °C, ƒIN = 1 kHz V V V V I –0.70/+1.05 –0.95/+1.5 ±1.7 ±2.25 Guaranteed +25 °C +25 °C +25 °C +25 °C (–3 dB of FS) V VI IV VI V V V VI V VI IV V IV IV V V V V IV IV 2.3 ±470 2 2.5 10 50 4 220 ±10 0.5 3.0 mVP-P % V µA kΩ pF MHz mV mV/V MSPS ns ps/°C ns ps rms Clocks Clocks Clocks Clocks –40 °C to +85 °C 250 6 8 22 0.5 2 2.5 2.5 2.5 3.5 10.5 4 5.3 6 6.16 7 7.8 ns ns +25 °C –40 °C to +85 °C +25 °C –40 °C to +85 °C VI IV VI IV 5.8 5.5 42 36 6.4 6.0 43 40 Bits Bits dB dB SPT7721 2 11/8/01 ELECTRICAL SPECIFICATIONS TA = TMIN to TMAX, AVCC = +5.0 V, ƒCLK = 250 MHz, VCM = 2.5 V, OVDD = 5 V, unless otherwise specified. PARAMETERS TEST CONDITIONS TEST LEVEL MIN SPT7721 TYP MAX UNITS Dynamic Performance Total Harmonic Distortion (THD) +25 °C ƒIN = 70 MHz –40 °C to +85 °C ƒIN = 70 MHz Signal-to-Noise and Distortion (SINAD) +25 °C ƒIN = 70 MHz –40 °C to +85 °C ƒIN = 70 MHz Power Supply Requirements AVCC Voltage (Analog Supply) OVDD Voltage (Digital Supply) AVCC Current Power Dissipation with Internal Voltage Reference Common Mode Reference Voltage Voltage Tempco Output Impedance Power Supply Rejection Ratio VI IV VI IV IV IV VI VI VI V V V VI IV IV IV IV IV VI VI IV IV VI VI VI VI V V V V 37 35 4.75 2.75 –43 –42 40 38 5.0 62 310 2.45 2.5 100 1 63 –40 –37 dB dB dB dB 5.25 5.25 70 350 2.55 V V mA mW V ppm/°C kΩ mV/V mVP-P V V V V V µA µA V V µA µA V V ns ns ns ns IOUT = ±50 µA Clock and Reset Inputs (Differential and Single-Ended) Differential Signal Amplitude (VDIFF) Differential High Input Voltage (VIHD) Differential Low Input Voltage (VILD) Differential Common-Mode Input (VCMD) Single-Ended High Input Voltage (VIH) Single-Ended Low Input Voltage (VIL) VID = 1.5 V Input Current High (IIH) VID = 1.5 V Input Current Low (IIL) Power Down and Mode Control Inputs (Single-Ended) High Input Voltage Low Input Voltage Maximum Input Current Low Maximum Input Current High