AD977A

a FEATURES Fast 16-Bit ADC 100 kSPS Throughput Rate—AD977 200 kSPS Throughput Rate—AD977A Single 5 V Supply Operation Power Dissipation 100 mW Max Power-Down Mode 50 ␮ W Input Ranges: Unipolar; 0 V–10 V, 0 V–5 V and 0 V–4 V Bipolar; ؎ 10 V, ؎ 5 V and ؎ 3.3 V Choice of External or Internal 2.5 V Reference High Speed Serial Interface On-Chip Clock 20-Lead Skinny DIP or SOIC Package 28-Lead Skinny SSOP Package CAP R1IN R2IN R3IN AGND2 VDIG 16-Bit, 100 kSPS/200 kSPS BiCMOS A/D Converter AD977/AD977A FUNCTIONAL BLOCK DIAGRAM REF 4k⍀ 4R 2R R 4R SWITCHED CAP ADC VANA AGND1 2.5V REFERENCE AD977/ AD977A SYNC SERIAL DATA INTERFACE BUSY DATACLK DATA R = 5k⍀ AD977 R = 2.5k⍀ AD977A CONTROL LOGIC & INTERNAL CALIBRATION CIRCUITRY CLOCK DGND PWRD R/C CS TAG SB/BTC EXT/INT GENERAL DESCRIPTION PRODUCT HIGHLIGHTS The AD977/AD977A is a high speed, low power 16-bit A/D converter that operates from a single 5 V supply. The AD977A has a throughput rate of 200 kSPS whereas the AD977 has a throughput rate of 100 kSPS. Each part contains a successive approximation, switched capacitor ADC, an internal 2.5 V reference, and a high speed serial interface. The ADC is factory calibrated to minimize all linearity errors. The AD977/AD977A is specified for full scale bipolar input ranges of ± 10 V, ± 5 V and ± 3.3 V, and unipolar ranges of 0 V to 10 V, 0 V to 5 V and 0 V to 4 V. The AD977/AD977A is comprehensively tested for ac parameters such as SNR and THD, as well as the more traditional dc para...