2.7 V to 5.5 V, 2.3 s, 10-Bit a ADC in 8-Lead microSOIC/DIP AD7810 FUNCTIONAL BLOCK DIAGRAM FEATURES 10-Bit ADC with 2.3 s Conversion Time V V DD AGND REF Small Footprint 8-Lead microSOIC Package Specified Over a 40 C to +105 C Temperature Range AD7810 Inherent Track-and-Hold Functionality CHARGE D OUT SERIAL REDISTRIBUTION PORT Operating Supply Range: 2.7 V to 5.5 V DAC SCLK Specifications at 2.7 V to 5.5 V CLOCK Microcontroller-Compatible Serial Interface OSC Optional Automatic Power-Down V + IN at End of Conversion CONTROL COMP V Low Power Operation IN LOGIC 3 V / DD 270 W at 10 kSPS Throughput Rate 2.7 mW at 100 kSPS Throughput Rate Analog Input Range: 0 V to V REF CONVST Reference Input Range: 0 V to V DD APPLICATIONS Low Power, Hand-Held Portable Applications that Require Analog-to-Digital Conversion with 10-Bit Accuracy e.g., Battery Powered Test Equipment, Battery-Powered Communications Systems GENERAL DESCRIPTION PRODUCT HIGHLIGHTS The AD7810 is a high speed, low power, 10-bit A/D con- 1. Complete, 10-Bit ADC in 8-Lead Package verter that operates from a single 2.7 V to 5.5 V supply. The The AD7810 is a 10-bit 2.3 s ADC with inherent track/hold part contains a 2.3 s successive approximation A/D converter, functionality and a high speed serial interfaceall in an with inherent track/hold functionality, a pseudo differential 8-lead microSOIC package. V may be connected to V REF DD input and a high speed serial interface that interfaces to most to eliminate the need for an external reference. The result is microcontrollers. The AD7810 is fully specified over a tem- a high speed, low power, space saving ADC solution. perature range of 40C to +105C. 2. Low Power, Single Supply Operation By using a technique that samples the state of the CONVST The AD7810 operates from a single 2.7 V to 5.5 V supply (convert start) signal at the end of a conversion, the AD7810 and typically consumes only 9 mW of power while convert- may be used in an automatic power-down mode. When used in ing. The power dissipation can be significantly reduced at this mode, the AD7810 automatically powers down at the end lower throughput rates by using the automatic power-down of a conversion and wakes up at the start of a new conversion. mode, e.g., at a throughput rate of 10 kSPS the power This feature significantly reduces the power consumption of the consumption is only 270 W. part at lower throughput rates. The AD7810 can also operate in 3. Automatic Power-Down a high speed mode where the part is not powered down between The automatic power-down mode, whereby the AD7810 conversions. In this high speed mode of operation, the conver- powers down at the end of a conversion and wakes up sion time of the AD7810 is 2.3 s. The maximum throughput before the next conversion, means the AD7810 is ideal for rate is dependent on the speed of the serial interface of the battery powered applications. See Power vs. Throughput microcontroller. Rate section. The part is available in a small 8-lead, 0.3 wide, plastic dual- 4. Serial Interface in-line package (mini-DIP) in an 8-lead, small outline IC An easy to use, fast serial interface allows connection to most (SOIC) and in an 8-lead microSOIC package. popular microprocessors with no external circuitry. 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 . All specifications 40 C to +105 C unless otherwise noted.) AD7810SPECIFICATIONS REF DD Parameter Y Version Unit Test Conditions/Comments DYNAMIC PERFORMANCE f = 30 kHz, f = 350 kHz IN SAMPLE 1 Signal to (Noise + Distortion) Ratio 58 dB min 1 Total Harmonic Distortion 64 dB max Peak Harmonic or Spurious Noise 64 dB max 2 Intermodulation Distortion fa = 48 kHz, fb = 48.5 kHz 2nd Order Terms 67 dB typ 3rd Order Terms 67 dB typ DC ACCURACY Resolution 10 Bits 1 Relative Accuracy 1 LSB max 1 Differential Nonlinearity (DNL) 1 LSB max 1 Offset Error 2 LSB max 1 Gain Error 2 LSB max Minimum Resolution for Which No Missing Codes Are Guaranteed 10 Bits ANALOG INPUT Input Voltage Range 0 V min V V max REF 2 1 A max Input Leakage Current 2 Input Capacitance 15 pF max 2 REFERENCE INPUTS V Input Voltage Range 1.2 V min REF V V max DD Input Leakage Current 3 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 INL 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 10 A max High Impedance Capacitance 15 pF max CONVERSION RATE Conversion Time 2.3 s max 1 Track/Hold Acquisition Time 100 ns max See DC Acquisition Time Section POWER SUPPLY V 2.75.5 Volts For Specified Performance DD I 3.5 mA max Sampling at 350 kSPS and Logic DD Power Dissipation 17.5 mW max Inputs at V or 0 V. V = 5 V DD DD Power-Down Mode I 1 A max V = 5 V V = 3 V DD DD DD Power Dissipation 5 W max Automatic Power Down 1 kSPS Throughput 27 W max 10 kSPS Throughput 270 W max 100 kSPS Throughput 2.7 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. REV. B 2