16-Bit, 100 kSPS/200 kSPS a BiCMOS A/D Converters AD976/AD976A FEATURES FUNCTIONAL BLOCK DIAGRAM Fast 16-Bit ADC V REF AGND1 ANA 200 kSPS Throughput AD976A 100 kSPS Throughput AD976 4kV 2.5V CAP Single 5 V Supply Operation REFERENCE Input Range: 610 V R AD976/AD976A 4R 100 mW Max Power Dissipation V IN Choice of External or Internal 2.5 V Reference D15 4R SWITCHED PARALLEL CAP ADC INTERFACE 3 D0 High Speed Parallel Interface On-Chip Clock AGND2 28-Lead Skinny DIP, SSOP or SOIC Packages CONTROL LOGIC & V CLOCK DIG INTERNAL CALIBRATION CIRCUITRY DGND BYTE R/C CS BUSY R = 6kV AD976 R = 3kV AD976A GENERAL DESCRIPTION PRODUCT HIGHLIGHTS The AD976/AD976A is a high speed, low power 16-bit A/D 1. Fast Throughput. converter that operates from a single 5 V supply. The part con- The AD976/AD976A is a high speed (100 kSPS/200 kSPS tains a successive approximation, switched capacitor ADC, an throughput rates respectively), 16-bit ADC based on a internal 2.5 V reference and a high speed parallel interface. The switched capacitor architecture. ADC is factory calibrated to minimize all linearity errors. The 2. Single-Supply Operation. analog full-scale input is the standard industrial range of 10 V. The AD976/AD976A operates from a single 5 V supply and The AD976/AD976A is comprehensively tested for ac param- dissipates only 100 mW max. eters such as SNR and THD, as well as the more traditional 3. Comprehensive DC and AC Specifications. parameters of offset, gain and linearity. The AD976/AD976A is factory calibrated and fully tested for The AD976/AD976A is fabricated on Analog Devices propri- SNR and THD as well as the traditional specifications of etary BiCMOS process, which has high performance bipolar offset, gain and linearity. devices along with CMOS transistors. 4. Complete A/D Solution. The AD976/AD976A is available in skinny 28-lead DIP, SSOP The AD976/AD976A offers a highly integrated solution and SOIC packages. containing an accurate ADC, reference and on-chip clock. REV. C 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 Tel: 781/329-4700 World Wide Web Site: AD976/AD976A (408C to +858C, F = 200 kHz, Ref = Internal Reference, V = V = +5 V unless S DIG ANA AD976ASPECIFICATIONS otherwise noted) AD976AA AD976AB AD976AC Parameter Min Typ Max Min Typ Max Min Typ Max Units RESOLUTION 16 16 16 Bits ANALOG INPUT Voltage Range 10 10 10 V Impedance 13 13 13 kW Capacitance 22 22 22 pF THROUGHPUT SPEED Complete Cycle 5 5 5 m s Throughput Rate 200 200 200 kHz DC ACCURACY 1 Integral Linearity Error 3 2 3 LSB Differential Linearity Error 2 +3 1 +1.75 2 LSB No Missing Codes 15 16 15 Bit 2 Transition Noise 1.0 1.0 1.0 LSB 3, 4 Full-Scale Error 0.5 0.25 0.5 % Full-Scale Error Drift 7 7 7 ppm/ C Full-Scale Error, Ext. REF = 2.5 V 0.5 0.25 0.5 % Full-Scale Error Drift, Ext. REF = 2.5 V 2 2 2 ppm/ C 4 Bipolar Zero Error 10 10 15 mV Bipolar Zero Error Drift 2 2 2 ppm/ C Power Supply Sensitivity V = V = V = 5 V 5% 8 8 8 LSB ANA DIG D AC ACCURACY 5 6 Spurious Free Dynamic Range 90 96 90 dB 5 Total Harmonic Distortion 90 96 90 dB 5 Signal to (Noise + Distortion) 83 85 83 dB 60 dB Input 27 28 27 dB 5 Signal to Noise 83 85 83 dB 7 Full-Power Bandwidth 1 1 1 MHz Input Bandwidth 2.7 2.7 2.7 MHz SAMPLING DYNAMICS Aperture Delay 40 40 40 ns Transient Response Full-Scale Step 1 1 1 m s 8 Overvoltage Recovery 150 150 150 ns REFERENCE Internal Reference Voltage 2.48 2.5 2.52 2.48 2.5 2.52 2.48 2.5 2.52 V Internal Reference Source Current 1 1 1 m A External Reference Voltage Range for Specified Linearity 2.3 2.5 2.7 2.3 2.5 2.7 2.3 2.5 2.7 V External Reference Current Drain Ext. REF = 2.5 V 100 100 100 m A DIGITAL INPUTS Logic Levels V 0.3 +0.8 0.3 +0.8 0.3 +0.8 V IL V +2.0 V + 0.3 +2.0 V + 0.3 +2.0 V + 0.3 V IH DIG DIG DIG I 10 10 10 m A IL I 10 10 10 m A IH NOTES 1 LSB means least significant bit. With a 10 V input, one LSB is 305 m V. 2 Typical rms noise at worst case transitions and temperatures. 3 Measured with fixed resistors as shown in Figure 5 (AD976) and Figure 6 (AD976A). Adjustable to zero as shown in Figure 7. 4 Full-scale error is expressed as the % difference between the actual full-scale code transition voltage and the ideal full-scale transition voltage and includes the effect of offset error. The full-scale error is the worst case of either the full-scale or +full-scale code transition voltage errors. 5 f = 20 kHz (AD976) and f = 45 kHz (AD976A), 0.5 dB down, unless otherwise noted. IN IN 6 All specifications in dB are referred to a full scale 10 V input. 7 Full-power bandwidth is defined as full-scale input frequency at which signal-to-(noise + distortion) degrades to 60 dB or 10 bits of accuracy. 8 Recovers to specified performance after a 2 F input overvoltage. S Specifications subject to change without notice. REV. C 2