10-Bit 20 MSPS 160 mW a CMOS A/D Converter AD876 FEATURES FUNCTIONAL BLOCK DIAGRAM CMOS 10-Bit 20 MSPS Sampling A/D Converter Pin-Compatible 8-Bit Option AV DV CLK DRV DD DD DD Power Dissipation: 160 mW +5 V Single Supply Operation SHA SHA GAIN SHA GAIN SHA GAIN STBY Differential Nonlinearity: 0.5 LSB AIN A/D Guaranteed No Missing Codes A/D D/A A/D D/A A/D D/A THREE- Power Down (Standby) Mode REFTF STATE Three-State Outputs REFTS CORRECTION LOGIC Digital I/Os Compatible with +5 V or +3.3 V Logic REFBS Adjustable Reference Input OUTPUT BUFFERS (MSB) REFBF Small Size: 28-Lead SOIC, 28-Lead SSOP, or 48-Lead AD876 D9 Thin Quad Flatpack (TQFP) D0 (LSB) CML AV DV DRV SS SS SS PRODUCT DESCRIPTION The AD876 comes in a space saving 28-lead SOIC and 48-lead The AD876 is a CMOS, 160 mW, 10-bit, 20 MSPS analog-to- thin quad flatpack (TQFP) and is specified over the commercial digital converter (ADC). The AD876 has an on-chip input (0C to +70C) temperature range. sample-and-hold amplifier. By implementing a multistage pipe- lined architecture with output error correction logic, the AD876 PRODUCT HIGHLIGHTS offers accurate performance and guarantees no missing codes Low Power over the full operating temperature range. Force and sense con- The AD876 at 160 mW consumes a fraction of the power of nections to the reference inputs minimize external voltage drops. presently available 8- or 10-bit, video speed converters. Power- down mode and single-supply operation further enhance its The AD876 can be placed into a standby mode of operation desirability in low power, battery operated applications such reducing the power below 50 mW. The AD876s digital I/O as electronic still cameras, camcorders and communication interfaces to either +5 V or +3.3 V logic. Digital output pins systems. can be placed in a high impedance state the format of the out- put is straight binary coding. Very Small Package The AD876 comes in a 28-lead SOIC, 28-lead SSOP, and 48- The AD876s speed, resolution and single-supply operation lead surface mount, thin quad flat package. The TQFP package ideally suit a variety of applications in video, multimedia, imag- is ideal for very tight, low headroom designs. ing, high speed data acquisition and communications. The AD876s low power and single-supply operation satisfy require- Digital I/O Functionality ments for high speed portable applications. Its speed and reso- The AD876 offers three-state output control. lution ideally suit charge coupled device (CCD) input systems Pin Compatible Upgrade Path such as color scanners, digital copiers, electronic still cameras The AD876 offers the option of laying out designs for eight and camcorders. bits and migrating to 10-bit resolution if prototype results warrant. REV. B Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. use, nor for any infringements of patents or other rights of third parties Tel: 781/329-4700 World Wide Web Site: (T to T with AV = +5.0 V, DV = +5.0 V, DRV = +3.3 V, V = +4.0 V, V = MIN MAX DD DD DD REFB REFB +2.0 V, f = 20 MSPS, unless otherwise noted) AD876SPECIFICATIONS CLOCK AD876JR-8 AD876 Parameter Min Typ Max Min Typ Max Units RESOLUTION 8 10 Bits DC ACCURACY Integral Nonlinearity (INL) 0.3 1.0 1.0 LSB Differential Nonlinearity (DNL) 0.1 0.75 0.5 1 LSB No Missing Codes GUARANTEED GUARANTEED Offset Error 0.1 0.4 % FSR Gain Error 0.1 0.2 % FSR ANALOG INPUT Input Range 2 2 V p-p Input Capacitance 5.0 5.0 pF REFERENCE INPUT Reference Top Voltage 3.5 4.0 4.5 3.5 4.0 4.5 V Reference Bottom Voltage 1.6 2.0 2.5 1.6 2.0 2.5 V Reference Input Resistance 250 250 Reference Input Current 8.0 8.0 mA Reference Top Offset 35 35 mV Reference Bottom Offset 35 35 mV DYNAMIC PERFORMANCE Effective Number of Bits f = 1 MHz 7.8 9.0 Bits IN f = 3.58 MHz 7.4 7.8 8.2 9.0 Bits IN f = 10 MHz 7.5 8.2 Bits IN Signal-to-Noise and Distortion (S/N+D) Ratio f = 1 MHz 49 56 dB IN = 3.58 MHz 46 49 51 56 dB f IN = 10 MHz 47 51 dB f IN Total Harmonic Distortion (THD) =1 MHz 62 62 dB f IN = 3.58 MHz 62 56 62 56 dB f IN =10 MHz 60 60 dB f IN 2 65 65 dB Spurious Free Dynamic Range Full Power Bandwidth 150 150 MHz Differential Phase 0.5 0.5 Degree Differential Gain 1 1 % POWER SUPPLIES Operating Voltage 1 AV +4.5 +5.25 +4.5 +5.25 Volts DD 1 +4.5 +5.25 +4.5 +5.25 Volts DV DD +3.0 +5.25 +3.0 +5.25 Volts DRV DD Operating Current 20 25 20 25 mA IAV DD 12 16 12 16 mA IDV DD IDRV 0.1 1 0.1 1 mA DD POWER CONSUMPTION 160 190 160 190 mW TEMPERATURE RANGE Specified 0 +70 0 +70 C NOTES 1 AV and DV must be within 0.5 V of each other to maintain specified performance levels. DD DD 2 3.58 MHz Input Frequency. Specifications subject to change without notice. See Definition of Specifications for additional information. 2 REV. B