2.7 V to 5.5 V, 200 kSPS a 8-Bit Sampling ADC AD7819 FEATURES FUNCTIONAL BLOCK DIAGRAM 8-Bit ADC with 4.5 s Conversion Time V V DD AGND REF On-Chip Track and Hold Operating Supply Range: 2.7 V to 5.5 V Specifications at 2.7 V 3.6 V and 5 V 10% AD7819 DB7 CHARGE 8-Bit Parallel Interface THREE- REDISTRIBUTION STATE DAC 8-Bit Read DRIVERS Power Performance DB0 CLOCK Normal Operation OSC 10.5 mW, V = 3 V DD Automatic Power-Down CONTROL COMP LOGIC T/H V 57.75 W 1 kSPS, V = 3 V IN DD Analog Input Range: 0 V to V REF Reference Input Range: 1.2 V to V DD BUSY CS RD CONVST PRODUCT HIGHLIGHTS GENERAL DESCRIPTION 1. Low Power, Single Supply Operation The AD7819 is a high speed, microprocessor-compatible, 8-bit The AD7819 operates from a single 2.7 V to 5.5 V supply analog-to-digital converter with a maximum throughput of and typically consumes only 10.5 mW of power. The power 200 kSPS. The converter operates off a single 2.7 V to 5.5 V dissipation can be significantly reduced at lower through- supply and contains a 4.5 s successive approximation A/D put rates by using the automatic power-down mode. converter, track/hold circuitry, on-chip clock oscillator and 8-bit wide parallel interface. The parallel interface is designed to 2. Automatic Power-Down allow easy interfacing to microprocessors and DSPs. Using only The automatic power-down mode, whereby the AD7819 address decoding logic the AD7819 is easily mapped into the goes into power-down mode at the end of a conversion and microprocessor address space. powers up before the next conversion, means the AD7819 is ideal for battery powered applications e.g., 57.75 W When used in its power-down mode, the AD7819 automatically 1 kSPS. (See Power vs. Throughput Rate section.) powers down at the end of a conversion and powers up at the start of a new conversion. This feature significantly reduces the 3. Parallel Interface power consumption of the part at lower throughput rates. The An easy to use 8-bit wide parallel interface allows interfacing AD7819 can also operate in a high speed mode where the part is to most popular microprocessors and DSPs with minimal not powered down between conversions. In this mode of opera- external circuitry. tion the part is capable of providing 200 kSPS throughput. 4. Dynamic Specifications for DSP Users The part is available in a small, 16-lead 0.3 wide, plastic dual- In addition to the traditional ADC specifications, the AD7819 in-line package (DIP) in a 16-lead, 0.15 wide, narrow body is specified for ac parameters, including signal-to-noise ratio small outline IC (SOIC) and in a 16-lead, narrow body, thin and distortion. shrink small outline package (TSSOP). 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: (GND = 0 V, V = V = 3 V 10% to 5 V 10%. All specifications 40 C REF DD 1 to +125 C unless otherwise noted.) AD7819SPECIFICATIONS Parameter Y Version Unit Test Conditions/Comments DYNAMIC PERFORMANCE f = 30 kHz, f = 136 kHz IN SAMPLE 1 Signal to (Noise + Distortion) Ratio 48 dB min 1 Total Harmonic Distortion (THD) 70 dB typ 1 Peak Harmonic or Spurious Noise 70 dB typ 2 Intermodulation Distortion fa = 29.1 kHz fb = 29.8 kHz 2nd Order Terms 77 dB typ 3rd Order Terms 77 dB typ DC ACCURACY Resolution 8 Bits Minimum Resolution for Which No Missing Codes Are Guaranteed 8 Bits 1 Relative Accuracy 0.5 LSB max 1 Differential Nonlinearity (DNL) 0.5 LSB max 1 Total Unadjusted Error 1 LSB max 1 Gain Error 0.5 LSB max 1 Offset Error 0.5 LSB max ANALOG INPUT Input Voltage Range 0 V min V V max REF 2 Input Leakage Current 1 A max 2 Input Capacitance 15 pF mx 2 REFERENCE INPUTS V Input Voltage Range 1.2 V min REF V V max DD Input Leakage Current 1 A max Input Capacitance 20 pF max 2 LOGIC INPUTS V Input High Voltage 2.0 V min INH, V Input Low Voltage 0.4 V max (0.8 V max, V = 5 V) INL, DD Input Current, I 1 A max Typically 10 nA, V = 0 V to V IN IN DD Input Capacitance, C 8 pF max IN LOGIC OUTPUTS Output High Voltage, V 2.4 V min I = 200 A OH SOURCE Output Low Voltage, V 0.4 V max I = 200 A OL SINK High Impedance Leakage Current 1 A max High Impedance Capacitance 15 pF max CONVERSION RATE Conversion Time 4.5 s max 1 Track/Hold Acquisition Time 100 ns max See DC Acquisition Section POWER SUPPLY V 2.75.5 Volts For Specified Performance DD I Digital Inputs = 0 V or V DD DD Normal Operation 3.5 mA max Power-Down 1 A max V = 5 V DD Power Dissipation Normal Operation 17.5 mW max V = 5 V DD Power-Down 5 W max Auto Power-Down (Mode 2) V = 3 V DD 1 kSPS Throughput 57.75 W max 10 kSPS Throughput 577.5 W max 50 kSPS Throughput 2.89 mW max NOTES 1 See Terminology section. 2 Sample tested during initial release and after any redesign or process change that may affect this parameter. Specifications subject to change without notice. 2 REV. B