16-Bit 100 kSPS a Sampling ADC AD677 FUNCTIONAL BLOCK DIAGRAM FEATURES Autocalibrating On-Chip Sample-Hold Function A CHIP V 10 Serial Output IN 16-BIT COMP 9 DAC AGND SENSE 16 Bits No Missing Codes INPUT V BUFFERS REF 11 61 LSB INL CAL 8 DAC AGND 99 dB THD LOGIC TIMING 92 dB S/(N+D) LEVEL TRANSLATORS 1 MHz Full Power Bandwidth 15 BUSY 14 SCLK SAR 16 CAL 3 MICROCODED SDATA CONTROLLER ALU 2 CLK RAM SAMPLE 1 D CHIP AD677 PRODUCT DESCRIPTION PRODUCT HIGHLIGHTS The AD677 is a multipurpose 16-bit serial output analog-to- 1. Autocalibration provides excellent dc performance while digital converter which utilizes a switched-capacitor/charge eliminating the need for user adjustments or additional exter- redistribution architecture to achieve a 100 kSPS conversion nal circuitry. rate (10 s total conversion time). Overall performance is opti- 2. 5 V to 10 V input range (V ). REF mized by digitally correcting internal nonlinearities through 3. Available in 16-pin 0.3 skinny DIP or 28-lead SOIC. on-chip autocalibration. 4. Easy serial interface to standard ADI DSPs. The AD677 circuitry is segmented onto two monolithic chips a digital control chip fabricated on Analog Devices DSP CMOS 5. TTL compatible inputs/outputs. process and an analog ADC chip fabricated on our BiMOS II 6. Excellent ac performance: 99 dB THD, 92 dB S/(N+D) process. Both chips are contained in a single package. peak spurious 101 dB. The AD677 is specified for ac (or dynamic) parameters such 7. Industry leading dc performance: 1.0 LSB INL, 1 LSB full as S/(N+D) Ratio, THD and IMD which are important in sig- scale and offset. nal processing applications. In addition, dc parameters are specified which are important in measurement applications. The AD677 operates from +5 V and 12 V supplies and typi- cally consumes 450 mW using a 10 V reference (360 mW with 5 V reference) during conversion. The digital supply (V ) is DD separated from the analog supplies (V , V ) for reduced digi- CC EE tal crosstalk. An analog ground sense is provided to remotely sense the ground potential of the signal source. This can be use- ful if the signal has to be carried some distance to the A/D con- verter. Separate analog and digital grounds are also provided. The AD677 is available in a 16-pin narrow plastic DIP, 16-pin narrow side-brazed ceramic package, or 28-lead SOIC. A paral- lel output version, the AD676, is available in a 28-pin ceramic or plastic DIP. All models operate over a commercial tempera- ture range of 0C to +70C or an industrial range of 40C to +85C. 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: 617/326-8703AD677SPECIFICATIONS 1 (T to T V = +12 V 6 5%, V = 12 V 6 5%, V = +5 V 6 10%) AC SPECIFICATIONS MIN MAX, CC EE DD AD677J/A AD677K/B Parameter Min Typ Max Min Typ Max Units 2 Total Harmonic Distortion (THD) 83 kSPS, T to T 97 92 99 95 dB MIN MAX 100 kSPS, +25C 97 92 99 95 dB 100 kSPS, T to T 93 95 dB MIN MAX 2, 3 Signal-to-Noise and Distortion Ratio (S/(N+D)) 83 kSPS, T to T 89 91 90 92 dB MIN MAX 100 kSPS, +25C8991 9092 dB 100 kSPS, T to T 89 90 dB MIN MAX Peak Spurious or Peak Harmonic Component 101 101 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 2.0 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 = 100 kSPS, f = 1.0 kHz, V = 0.05 dB, Bandwidth = 50 kHz unless otherwise indicated. All measurements referred to a 0 dB REF lN IN (20 V p-p) input signal. Values are post-calibration. 2 For other input amplitudes, refer to Figure 12. 3 For dynamic performance with different reference values see Figure 11. 4 fa = 1008 Hz, fb = 1055 Hz. See Definition of Specifications section and Figure 16. Specifications subject to change without notice. 2 REV. A