3 V to 5 V Single Supply, 200 kSPS a 12-Bit Sampling ADCs AD7854/AD7854L FUNCTIONAL BLOCK DIAGRAM FEATURES Specified for V of 3 V to 5.5 V AV AGND DD DD Read-Only Operation AD7854200 kSPS AD7854L100 kSPS AIN(+) AD7854/AD7854L T/H System and Self-Calibration AIN() Low Power DV 2.5V DD Normal Operation REFERENCE AD7854: 15 mW (V = 3 V) DD COMP REF / IN AD7854L: 5.5 mW (V = 3 V) BUF DD REF OUT Automatic Power-Down After Conversion (25 W) DGND AD7854: 1.3 mW 10 kSPS C REF1 CHARGE AD7854L: 650 W 10 kSPS REDISTRIBUTION DAC Flexible Parallel Interface CLKIN 12-Bit Parallel/8-Bit Parallel (AD7854) SAR + ADC CONVST C 28-Lead DIP, SOIC and SSOP Packages (AD7854) REF2 CONTROL CALIBRATION BUSY MEMORY APPLICATIONS AND CONTROLLER Battery-Powered Systems (Personal Digital Assistants, Medical Instruments, Mobile Communications) Pen Computers PARALLEL INTERFACE/CONTROL REGISTER Instrumentation and Control Systems High Speed Modems HBEN DB11DB0 CS RD WR GENERAL DESCRIPTION PRODUCT HIGHLIGHTS The AD7854/AD7854L is a high speed, low power, 12-bit ADC 1. Operation with either 3 V or 5 V power supplies. that operates from a single 3 V or 5 V power supply, the 2. Flexible power management options including automatic AD7854 being optimized for speed and the AD7854L for low power-down after conversion. By using the power manage- power. The ADC powers up with a set of default conditions at ment options a superior power performance at slower which time it can be operated as a read-only ADC. The ADC throughput rates can be achieved: contains self-calibration and system calibration options to en- AD7854: 1 mW typ 10 kSPS sure accurate operation over time and temperature and has a AD7854L: 1 mW typ 20 kSPS number of power-down options for low power applications. 3. Operates with reference voltages from 1.2 V to AV . DD The AD7854 is capable of 200 kHz throughput rate while the 4. Analog input ranges from 0 V to AV . DD AD7854L is capable of 100 kHz throughput rate. The input track-and-hold acquires a signal in 500 ns and features a pseudo- 5. Self-calibration and system calibration. differential sampling scheme. The AD7854 and AD7854L input 6. Versatile parallel I/O port. voltage range is 0 to V (unipolar) and V /2 to +V /2, REF REF REF 7. Lower power version AD7854L. centered at V /2 (bipolar). The coding is straight binary in REF unipolar mode and twos complement in bipolar mode. Input signal range is to the supply and the part is capable of convert- ing full-power signals to 100 kHz. 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 28-lead, 0.6 inch wide dual-in-line pack- age (DIP), 28-lead small outline (SOIC) and 28-lead small shrink outline (SSOP) packages. See Page 27 for data sheet index. 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 AD7854/AD7854LSPECIFICATIONS DD DD IN OUT External Reference, f = 4 MHz (for L Version: 1.8 MHz (0 C to +70 C) and 1 MHz (40 C to +85 C)) f = 200 kHz (AD7854), 100 kHz CLKIN SAMPLE (AD7854L) T = T to T , unless otherwise noted.) Specifications in () apply to the AD7854L. A MIN MAX 1 1 1 Parameter A Version B Version S Version Units Test Conditions/Comments DYNAMIC PERFORMANCE 3 Signal to Noise + Distortion Ratio 70 71 70 dB min Typically SNR is 72 dB (SNR) V = 10 kHz Sine Wave, f = 200 kHz IN SAMPLE (L Version: f = 100 kHz f = 2 MHz) SAMPLE CLKIN Total Harmonic Distortion (THD) 78 78 78 dB max V = 10 kHz Sine Wave, f = 200 kHz IN SAMPLE (L Version: f = 100 kHz f = 2 MHz) SAMPLE CLKIN Peak Harmonic or Spurious Noise 78 78 78 dB max V = 10 kHz Sine Wave, f = 200 kHz IN SAMPLE (L Version: f = 100 kHz f = 2 MHz) SAMPLE CLKIN Intermodulation Distortion (IMD) Second Order Terms 78 78 78 dB typ fa = 9.983 kHz, fb = 10.05 kHz, f = 200 kHz SAMPLE (L Version: f = 100 kHz f = 2 MHz) SAMPLE CLKIN Third Order Terms 78 78 78 dB typ fa = 9.983 kHz, fb = 10.05 kHz, f = 200 kHz SAMPLE (L Version: f = 100 kHz f = 2 MHz) SAMPLE CLKIN DC ACCURACY Resolution 12 12 12 Bits Integral Nonlinearity 1 0.5 1 LSB max 5 V Reference V = 5 V DD Differential Nonlinearity 1 1 1 LSB max Guaranteed No Missed Codes to 12 Bits Unipolar Offset Error 3 3 4 LSB max 2 2 2 LSB typ Unipolar Gain Error 4 4 4 LSB max 2 2 2 LSB typ Bipolar Positive Full-Scale Error 4 4 5 LSB max 2 2 2 LSB typ Negative Full-Scale Error 4 4 5 LSB max 2 2 2 LSB typ Bipolar Zero Error 4 4 5 LSB max ANALOG INPUT Input Voltage Ranges 0 to V 0 to V 0 to V Volts i.e., AIN(+) AIN() = 0 to V , AIN() can be REF REF REF REF biased up but AIN(+) cannot go below AIN(). V /2 V /2 V /2 Volts i.e., AIN(+) AIN() = V /2 to +V /2, AIN() REF REF REF REF REF should be biased to +V /2 and AIN(+) can go below REF AIN() but cannot go below 0 V. Leakage Current 1 1 1 A max Input Capacitance 20 20 20 pF typ REFERENCE INPUT/OUTPUT REF Input Voltage Range 2.3/V 2.3/V 2.3/V V min/max Functional from 1.2 V IN DD DD DD Input Impedance 150 150 150 k typ REF Output Voltage 2.3/2.75 2.3/2.7 2.3/2.7 V min/max OUT REF Tempco 20 20 20 ppm/C typ OUT LOGIC INPUTS Input High Voltage, V 3 3 3 V min AV = DV = 4.5 V to 5.5 V INH DD DD 2.1 2.1 2.1 V min AV = DV = 3.0 V to 3.6 V DD DD Input Low Voltage, V 0.4 0.4 0.4 V max AV = DV = 4.5 V to 5.5 V INL DD DD 0.6 0.6 0.6 V max AV = DV = 3.0 V to 3.6 V DD DD Input Current, I 10 10 10 A max Typically 10 nA, V = 0 V or V IN IN DD 4 Input Capacitance, C 10 10 10 pF max IN LOGIC OUTPUTS Output High Voltage, V I = 200 A OH SOURCE 4 4 4 V min AV = DV = 4.5 V to 5.5 V DD DD 2.4 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 0.4 V max I = 0.8 mA OL SINK Floating-State Leakage Current 10 10 10 A max 4 Floating-State Output Capacitance 10 10 10 pF max Output Coding Straight (Natural) Binary Unipolar Input Range Twos Complement Bipolar Input Range CONVERSION RATE t 18 CLKIN Conversion Time 4.6 (10) 4.6 (9) 4.6 (9) s max (L Versions Only, 0C to +70C, 1.8 MHz CLKIN) Track/Hold Acquisition Time 0.5 (1) 0.5 (1) 0.5 (1) s min (L Versions Only, 40C to +85C, 1 MHz CLKIN) 2 REV. 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