16-Bit, 100 kSPS/200 kSPS a BiCMOS A/D Converter AD977/AD977A FEATURES FUNCTIONAL BLOCK DIAGRAM Fast 16-Bit ADC 100 kSPS Throughput RateAD977 V REF ANA AGND1 200 kSPS Throughput RateAD977A 4k Single 5 V Supply Operation 2.5V AD977/ CAP REFERENCE Power Dissipation 100 mW Max AD977A 4R R1 IN Power-Down Mode 50 W SYNC 2R Input Ranges: R2 SERIAL IN BUSY DATA SWITCHED R Unipolar 0 V10 V, 0 V5 V and 0 V4 V 4R DATACLK R3 INTERFACE IN CAP ADC DATA Bipolar 10 V, 5 V and 3.3 V R = 5k AD977 Choice of External or Internal 2.5 V Reference AGND2 R = 2.5k AD977A High Speed Serial Interface CONTROL LOGIC & V DIG CLOCK On-Chip Clock INTERNAL CALIBRATION CIRCUITRY 20-Lead Skinny DIP or SOIC Package 28-Lead Skinny SSOP Package DGND PWRD R/CCS TAG SB/BTC EXT/INT GENERAL DESCRIPTION PRODUCT HIGHLIGHTS The AD977/AD977A is a high speed, low power 16-bit A/D 1. Fast Throughput converter that operates from a single 5 V supply. The AD977A The AD977/AD977A is a high speed, 16-bit ADC based on has a throughput rate of 200 kSPS whereas the AD977 has a a factory calibrated switched capacitor architecture. throughput rate of 100 kSPS. Each part contains a successive 2. Single-Supply Operation approximation, switched capacitor ADC, an internal 2.5 V The AD977/AD977A operates from a single 5 V supply and reference, and a high speed serial interface. The ADC is factory dissipates only 100 mW max. calibrated to minimize all linearity errors. The AD977/AD977A is 3. Comprehensive DC and AC Specifications specified for full scale bipolar input ranges of 10 V, 5 V and In addition to the traditional specifications of offset, gain 3.3 V, and unipolar ranges of 0 V to 10 V, 0 V to 5 V and and linearity, the AD977/AD977A is fully tested for SNR 0 V to 4 V. and THD. The AD977/AD977A is comprehensively tested for ac param- eters such as SNR and THD, as well as the more traditional dc parameters of offset, gain and linearity. REV. D 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: AD977/AD977A AD977SPECIFICATIONS (40 C to +85 C, F = 100 kHz, V = V = 5 V, unless otherwise noted) S DIG ANA A Grade B Grade C Grade Parameter Min Typ Max Min Typ Max Min Typ Max Unit RESOLUTION 16 16 16 Bits ANALOG INPUT Voltage Range 10 V, 0 V to 5 V, . (See Table II) Impedance See Table II Sampling Capacitance 40 40 40 pF THROUGHPUT SPEED Complete Cycle 10 10 10 s Throughput Rate 100 100 100 kHz DC ACCURACY 1 Integral Linearity Error 3 2.0 3 LSB Differential Linearity Error 2 +3 1 +1.75 2 LSB No Missing Codes 15 16 15 Bits 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 3 Bipolar Zero Error Bipolar Ranges 10 10 15 mV Bipolar Zero Error Drift Bipolar Ranges 2 2 2 ppm/C 3 Unipolar Zero Error Unipolar Ranges 10 10 10 mV Unipolar Zero Error Drift Unipolar Ranges 2 2 2 ppm/C Recovery to Rated Accuracy 5 After Power-Down 2.2 F to CAP 1 1 1 ms Power Supply Sensitivity V = V = V = 5 V 5% 8 8 8 LSB ANA DIG D AC ACCURACY 6 7 Spurious Free Dynamic Range 90 96 90 dB 6 Total Harmonic Distortion 90 96 90 dB 6 Signal-to-(Noise+Distortion) 83 85 83 dB 60 dB Input 27 28 27 dB 6 Signal-to-Noise 83 85 83 dB 8 Full Power Bandwidth 700 700 700 kHz 3 dB Input Bandwidth 1.5 1.5 1.5 MHz SAMPLING DYNAMICS Aperture Delay 40 40 40 ns Transient Response, Full-Scale Step 2 2 2 s 9 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 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 A NOTES 1 LSB means Least Significant Bit. With a 10 V input, one LSB is 305 V. 2 Typical rms noise at worst case transitions and temperatures. 3 Measured with fixed resistors as shown in Figures 11, 12 and 13. Adjustable to zero. Tested at room temperature. 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. For bipolar input ranges, the Full-Scale Error is the worst case of either the Full Scale or +Full Scale code transition voltage errors. For unipolar input ranges, Full-Scale Error is with respect to the +Full-Scale code transition voltage. 5 External 2.5 V reference connected to REF. 6 f = 20 kHz, 0.5 dB down unless otherwise noted. IN 7 All specifications in dB are referred to a full scale 10 V input. 8 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. 9 Recovers to specified performance after a 2 F input overvoltage. S Specifications subject to change without notice. 2 REV. D