3 V to 5 V Single Supply, 200 kSPS a 12-Bit Sampling ADCs AD7853/AD7853L* FUNCTIONAL BLOCK DIAGRAM FEATURES Specified for V of 3 V to 5.5 V DD AV AGND AGND DD Read-Only Operation AD7853200 kSPS AD7853L100 kSPS DV DD AIN(+) System and Self-Calibration with Autocalibration on AD7853/AD7853L T/H Power-Up AIN() DGND Low Power: 2.5V AD7853: 12 mW (V = 3 V) REFERENCE DD AD7853L: 4.5 mW (V = 3 V) COMP DD Automatic Power Down After Conversion (25 mW) REF / BUF IN Flexible Serial Interface: REF OUT 8051/SPI/QSPI/mP Compatible C REF1 24-Lead DIP, SOIC and SSOP Packages AMODE CHARGE REDISTRIBUTION APPLICATIONS DAC CLKIN Battery-Powered Systems (Personal Digital Assistants, C REF2 SAR + ADC CONVST Medical Instruments, Mobile Communications) CONTROL Pen Computers CALIBRATION BUSY CAL MEMORY Instrumentation and Control Systems AND CONTROLLER SLEEP High Speed Modems SERIAL INTERFACE / CONTROL REGISTER GENERAL DESCRIPTION SM1 SM2 SYNC DIN DOUT SCLK POLARITY The AD7853/AD7853L are high speed, low power, 12-bit ADCs that operate from a single 3 V or 5 V power supply, the AD7853 being optimized for speed and the AD7853L for low power. The ADC powers up with a set of default conditions at PRODUCT HIGHLIGHTS which time it can be operated as a read-only ADC. The ADC 1. Specified for 3 V and 5 V supplies. contains self-calibration and system-calibration options to en- sure accurate operation over time and temperature and have a 2. Automatic calibration on power-up. number of power-down options for low power applications. 3. Flexible power management options including automatic The part powers up with a set of default conditions and can power-down after conversion. operate as a read only ADC. 4. Operates with reference voltages from 1.2 V to V . DD The AD7853 is capable of 200 kHz throughput rate while the 5. Analog input ranges from 0 V to V . DD AD7853L is capable of 100 kHz throughput rate. The input track-and-hold acquires a signal in 500 ns and features a pseudo- 6. Self- and system calibration. differential sampling scheme. The AD7853/AD7853L voltage 7. Versatile serial I/O port (SPI/QSPI/8051/m P). range is 0 to V with both straight binary and twos comple- REF 8. Lower power version AD7853L. ment output coding. Input signal range is to the supply, and the part is capable of converting full power signals to 100 kHz. CMOS construction ensures low power dissipation of typically 4.5 mW for normal operation and 1.15 mW in power-down mode, with a throughput rate of 10 kSPS (V = 3 V). The part DD is available in 24-lead, 0.3 inch wide dual-in-line package (DIP), 24-lead small outline (SOIC) and 24-lead small shrink outline (SSOP) packages. *Patent pending. SPI and QSPI are trademarks of Motorola, Incorporated. 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 which may result from its use. No license is granted by implication or Tel: 781/329-4700 World Wide Web Site: 1, 2 (AV = DV = +3.0 V to +5.5 V, REF /REF = 2.5 V AD7853/AD7853LSPECIFICATIONS DD DD IN OUT External Reference, f = 4 MHz (1.8 MHz B Grade (08C to +708C), 1 MHz A and B Grades (408C to +858C) for L Version) f = 200 kHz CLKIN SAMPLE (AD7853) 100 kHz (AD7853L) SLEEP = Logic High T = T to T , unless otherwise noted.) Specifications in () apply to the AD7853L. A MIN MAX 1 1 Parameter A Version B Version Units Test Conditions/Comments DYNAMIC PERFORMANCE 3 Signal to Noise + Distortion Ratio 70 71 dB min Typically SNR Is 72 dB (SNR) V = 10 kHz Sine Wave, f = 200 kHz (100 kHz) IN SAMPLE Total Harmonic Distortion (THD) 78 78 dB max V = 10 kHz Sine Wave, f = 200 kHz (100 kHz) IN SAMPLE Peak Harmonic or Spurious Noise 78 78 dB max V = 10 kHz Sine Wave, f = 200 kHz (100 kHz) IN SAMPLE Intermodulation Distortion (IMD) Second Order Terms 78 80 dB typ fa = 9.983 kHz, fb = 10.05 kHz, f = 200 kHz (100 kHz) SAMPLE Third Order Terms 78 80 dB typ fa = 9.983 kHz, fb = 10.05 kHz, f = 200 kHz (100 kHz) SAMPLE DC ACCURACY Resolution 12 12 Bits Integral Nonlinearity 1 1 LSB max 2.5 V External Reference V = 3 V, V = 5 V (B Grade Only) DD DD 1 0.5 LSB max 5 V External Reference V = 5 V DD ( 1) LSB max (L Version, 5 V External Reference, V = 5 V) DD ( 1) LSB max (L Version) Differential Nonlinearity 1 1 LSB max Guaranteed No Missed Codes to 12 Bits. 2.5 V External Reference V = 3 V, 5 V External Reference V = 5 V DD DD Total Unadjusted Error 1 1 LSB typ Unipolar Offset Error 1 1 LSB max 2.5 V External Reference V = 3 V, 5 V External Reference V = 5 V DD DD Unipolar Offset Error ( 2.5) ( 2.5) LSB max (L Versions, 2.5 V External Reference V = 3 V, 5 V External DD Reference V = 5 V) DD Positive Full-Scale Error 2.5 2.5 LSB max 2.5 V External Reference V = 3 V, 5 V External Reference V = 5 V DD DD Positive Full-Scale Error ( 4) ( 4) LSB max (L Versions, 2.5 V External Reference V = 3 V, 5 V External DD Reference V = 5 V) DD Negative Full-Scale Error 2.5 2.5 LSB max 2.5 V External Reference V = 3 V, 5 V External Reference V = 5 V DD DD Negative Full-Scale Error ( 4) ( 4) LSB max (L Versions, 2.5 V External Reference V = 3 V, 5 V External DD Reference V = 5 V) DD Bipolar Zero Error 2 2 LSB max 2.5 V External Reference V = 3 V, 5 V External Reference V = 5 V DD DD Bipolar Zero Error ( 2.5) ( 2.5) LSB max (L Versions, 2.5 V External Reference V = 3 V, 5 V External DD Reference V = 5 V) DD ANALOG INPUT Input Voltage Ranges 0 to V 0 to V Volts i.e., AIN(+) AIN() = 0 to V , AIN() Can Be Biased REF REF REF Up But AIN(+) Cannot Go Below AIN() V /2 V /2 Volts i.e., AIN(+) AIN() = V /2 to +V /2, AIN() Should REF REF REF REF Be Biased to +V /2 and AIN(+) Can Go Below AIN() But REF Cannot Go Below 0 V Leakage Current 1 1 m A max Input Capacitance 20 20 pF typ REFERENCE INPUT/OUTPUT REF Input Voltage Range 2.3/V 2.3/V V min/max Functional from 1.2 V IN DD DD Input Impedance 150 150 kW typ REF Output Voltage 2.3/2.7 2.3/2.7 V min/max OUT REF Tempco 20 20 ppm/ C typ OUT LOGIC INPUTS Input High Voltage, V INH 2.4 2.4 V min AV = DV = 4.5 V to 5.5 V DD DD 2.1 2.1 V min AV = DV = 3.0 V to 3.6 V DD DD Input Low Voltage, V INL 0.8 0.8 V max AV = DV = 4.5 V to 5.5 V DD DD 0.6 0.6 V max AV = DV = 3.0 V to 3.6 V DD DD Input Current, I 10 10 m A max Typically 10 nA, V = 0 V or V IN IN DD 4 Input Capacitance, C 10 10 pF max IN 2 REV. B