3 V to 5 V Single Supply, 200 kSPS a 8-Channel, 12-Bit Sampling ADCs AD7859/AD7859L FUNCTIONAL BLOCK DIAGRAM FEATURES Specified for V of 3 V to 5.5 V DD AV AGND DD AD7859200 kSPS AD7859L100 kSPS System and Self-Calibration Low Power AD7859/AD7859L AIN1 I/P Normal Operation T/H MUX DV AD7859: 15 mW (V = 3 V) DD AIN8 DD AD7859L: 5.5 mW (V = 3 V) DD 2.5V Using Automatic Power-Down After Conversion (25 mW) REFERENCE COMP AD7859: 1.3 mW (V = 3 V 10 kSPS) DD REF / IN AD7859L: 650 mW (V = 3 V 10 kSPS) REF BUF DD OUT DGND Flexible Parallel Interface: 16-Bit Parallel/8-Bit Parallel CHARGE 44-Pin PQFP and PLCC Packages REDISTRIBUTION C REF1 DAC APPLICATIONS CLKIN Battery-Powered Systems (Personal Digital Assistants, C REF2 CONVST SAR + ADC Medical Instruments, Mobile Communications) CALIBRATION MEMORY CONTROL BUSY AND Pen Computers CONTROLLER SLEEP Instrumentation and Control Systems CAL High Speed Modems PARALLEL INTERFACE/CONTROL REGISTER GENERAL DESCRIPTION The AD7859/AD7859L are high speed, low power, 8-channel, WR DB15 DB0 RD CS W/B 12-bit ADCs which operate from a single 3 V or 5 V power supply, the AD7859 being optimized for speed and the AD7859L for low power. The ADC contains self-calibration PRODUCT HIGHLIGHTS and system calibration options to ensure accurate operation over 1. Operation with either 3 V or 5 V power supplies. time and temperature and have a number of power-down 2. Flexible power management options including automatic options for low power applications. power-down after conversion. The AD7859 is capable of 200 kHz throughput rate while the 3. By using the power management options a superior power AD7859L is capable of 100 kHz throughput rate. The input performance at slower throughput rates can be achieved. track-and-hold acquires a signal in 500 ns and features a pseudo- AD7859: 1 mW typ 10 kSPS differential sampling scheme. The AD7859 and AD7859L input AD7859L: 1 mW typ 20 kSPS voltage range is 0 to V (unipolar) and V /2 to +V /2 REF REF REF 4. Operates with reference voltages from 1.2 V to the supply. about V /2 (bipolar) with both straight binary and 2s comple- REF 5. Analog input ranges from 0 V to V . DD ment output coding respectively. Input signal range is to the 6. Self and system calibration. supply and the part is capable of converting full-power signals to 100 kHz. 7. Versatile parallel I/O port. 8. Lower power version AD7859L. CMOS construction ensures low power dissipation of typically 5.4 mW for normal operation and 3.6 W in power-down mode. The part is available in 44-pin, plastic quad flatpack package (PQFP) and plastic lead chip carrier (PLCC). See page 28 for data sheet index. REV. A Information furnished by Analog Devices is believed to be accurate and Analog Devices, Inc., 1996 reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Tel: 617/329-4700 Fax: 617/326-87031, 2 (AV = DV = +3.0 V to +5.5 V, REF /REF = 2.5 V AD7859/AD7859LSPECIFICATIONS DD DD IN OUT External Reference, f = 4 MHz (for L Version: 1.8 MHz (08C to +708C) and 1 MHz (408C to +858C)) f = 200 kHz (AD7859) 100 kHz CLKIN SAMPLE (AD7859L) SLEEP = Logic High T = T to T , unless otherwise noted.) Specifications in () apply to the AD7859L. 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 IN SAMPLE (for L Version: f = 100 kHz f = 2 MHz) SAMPLE CLKIN Total Harmonic Distortion (THD) 78 78 dB max V = 10 kHz Sine Wave, f = 200 kHz IN SAMPLE (for L Version: f = 100 kHz f = 2 MHz) SAMPLE CLKIN Peak Harmonic or Spurious Noise 78 78 dB max V = 10 kHz Sine Wave, f = 200 kHz IN SAMPLE (for L Version: f = 100 kHz f = 2 MHz) SAMPLE CLKIN Intermodulation Distortion (IMD) = 200 kHz Second Order Terms 78 78 dB typ fa = 9.983 kHz, fb = 10.05 kHz, f SAMPLE (for L Version: f = 100 kHz f = 2 MHz) SAMPLE CLKIN Third Order Terms 78 78 dB typ fa = 9.983 kHz, fb = 10.05 kHz, f = 200 kHz SAMPLE (for L Version: f = 100 kHz f = 2 MHz) SAMPLE CLKIN Channel-to-Channel Isolation 80 80 dB typ V = 25 kHz IN DC ACCURACY Resolution 12 12 Bits Integral Nonlinearity 1 0.5 LSB max 5 V Reference V = 5 V DD Differential Nonlinearity 1 1 LSB max Guaranteed No Missed Codes to 12 Bits Unipolar Offset Error 5 5 LSB max 2 2 LSB typ Unipolar Offset Error Match 2(3) 2 LSB max Positive Full-Scale Error 5 5 LSB max 2 2 LSB typ Negative Full-Scale Error 2 2 LSB max Full-Scale Error Match 1 1 LSB max Bipolar Zero Error 1 1 LSB typ Bipolar Zero Error Match 2 2 LSB typ ANALOG INPUT Input Voltage Ranges 0 to V 0 to V Volts i.e., AIN(+) AIN() = 0 to V , AIN() Can Be REF REF REF Biased Up But AIN(+) Cannot Go Below AIN() V /2 V /2 Volts i.e., AIN(+) AIN() = V /2 to +V /2, AIN() REF REF REF REF Should Be Biased to +V /2 and AIN(+) Can Go REF Below AIN() But Cannot Go Below 0 V Leakage Current 1 1 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 k 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 2.4 2.4 V min AV = DV = 4.5 V to 5.5 V INH DD DD 2.1 2.1 V min AV = DV = 3.0 V to 3.6 V DD DD CAL Pin 3 3 V min AV = DV = 4.5 V to 5.5 V DD DD 2.4 2.4 V min AV = DV = 3.0 V to 3.6 V DD DD Input Low Voltage, V 0.8 0.8 V max AV = DV = 4.5 V to 5.5 V INL DD DD 0.6 0.6 V max AV = DV = 3.0 V to 3.6 V DD DD Input Current, I 10 10 A max Typically 10 nA, V = 0 V or V IN IN DD 4 Input Capacitance, C 10 10 pF max IN LOGIC OUTPUTS Output High Voltage, V 4 4 V min AV = DV = 4.5 V to 5.5 V OH DD DD 2.4 2.4 V min AV = DV = 3.0 V to 3.6 V DD DD Output Low Voltage, V 0.4 0.4 V max I = 1.6 mA OL SINK Floating State Leakage Current 10 10 A max 4 Floating-State Output Capacitance 10 10 pF max Output Coding Straight (Natural) Binary Unipolar Input Range 2s Complement Bipolar Input Range 2 REV. A