16-Bit 100 kSPS a Sampling ADC AD676 FUNCTIONAL BLOCK DIAGRAM FEATURES Autocalibrating On-Chip Sample-Hold Function ANALOG Parallel Output Format V 15 IN CHIP 16 Bits No Missing Codes AGND SENSE 14 16-BIT INPUT COMP DAC 61 LSB INL BUFFERS V 16 16 REF 97 dB THD 13 AGND CAL 90 dB S/(N+D) DAC 1 MHz Full Power Bandwidth LOGIC & TIMING LEVEL TRANSLATORS DIGITAL BUSY CHIP 7 SAR 1 CAL 8 PAT L 6 MICRO-CODED A GEN SAMPLE 9 BIT 1 BIT 16 T CONTROLLER 19 C ALU CLK 10 H PRODUCT DESCRIPTION 28 RAM The AD676 is a multipurpose 16-bit parallel output analog-to- digital converter which utilizes a switched-capacitor/charge AD676 redistribution architecture to achieve a 100 kSPS conversion rate (10 s total conversion time). Overall performance is opti- mized by digitally correcting internal nonlinearities through on-chip autocalibration. The AD676 operates from +5 V and 12 V supplies and typi- The AD676 circuitry is segmented onto two monolithic chips cally consumes 360 mW during conversion. The digital supply a digital control chip fabricated on Analog Devices DSP CMOS (V ) is separated from the analog supplies (V , V ) for re- DD CC EE process and an analog ADC chip fabricated on our BiMOS II duced digital crosstalk. An analog ground sense is provided for process. Both chips are contained in a single package. the analog input. Separate analog and digital grounds are also provided. The AD676 is specified for ac (or dynamic) parameters such as S/(N+D) Ratio, THD and IMD which are important in sig- The AD676 is available in a 28-pin plastic DIP or 28-pin side- nal processing applications. In addition, dc parameters are brazed ceramic package. A serial-output version, the AD677, is specified which are important in measurement applications. available in a 16-pin 300 mil wide ceramic or plastic package. REV. A Information furnished by Analog Devices is believed to be accurate and 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: 617/326-8703AD676SPECIFICATIONS 1 AC SPECIFICATIONS (T to T V = +12 V 6 5%, V = 12 V 6 5%, V = +5 V 6 10%) MIN MAX, CC EE DD AD676J/A AD676K/B Parameter Min Typ Max Min Typ Max Units 2 Total Harmonic Distortion (THD) 83 kSPS, T to T 96 88 97 90 dB MIN MAX 0.0016 0.004 0.0014 0.003 % 100 kSPS, +25C 96 97 dB 0.0016 0.0014 % 100 kSPS, T to T 92 92 dB MIN MAX 0.0025 0.0025 % 2, 3 Signal-to-Noise and Distortion Ratio (S/(N+D)) 83 kSPS, T to T 85 89 87 90 dB MIN MAX 100 kSPS, +25C89 90dB 100 kSPS, T to T 86 86 dB MIN MAX Peak Spurious or Peak Harmonic Component 98 98 dB 4 Intermodulation Distortion (IMD) 2nd Order Products 102 102 dB 3rd Order Products 98 98 dB Full Power Bandwidth 1 1 MHz Noise 160 160 V rms DIGITAL SPECIFICATIONS (for all grades T to T , V = +12 V 6 5%, V = 12 V 6 5%, V = +5 V 6 10%) MIN MAX CC EE DD Parameter Test Conditions Min Typ Max Units LOGIC INPUTS V High Level Input Voltage 2.4 V + 0.3 V IH DD V Low Level Input Voltage 0.3 0.8 V IL I High Level Input Current V = V 10 +10 A IH IH DD I Low Level Input Current V = 0 V 10 +10 A IL IL C Input Capacitance 10 pF IN LOGIC OUTPUTS V High Level Output Voltage I = 0.1 mA V 1 V V OH OH DD I = 0.5 mA 2.4 V OH V Low Level Output Voltage I = 1.6 mA 0.4 V OL OL NOTES 1 V = 10.0 V, (Conversion Rate (fs) = 83 kSPS, f = 1.0 kHz, V = 0.05 dB, Bandwidth = fs/2 unless otherwise indicated. All measurements referred to a 0 dB REF IN IN (20 V p-p) input signal. Values are post-calibration. 2 For other input amplitudes, refer to Figure 13. 3 For other input ranges/voltages reference values see Figure 12. 4 fa = 1008 Hz. fb = 1055 Hz. See Definition of Specifications section and Figure 15. Specifications subject to change without notice. 2 REV. A