ADC0820 Datasheet | National Semiconductor

Description By using a half-flash conversion technique, the 8-bit ADC0820 CMOS A/D offers a 1.5 µs conversion time and dissipates only 75 m W of power. The half-flash technique consists of 32 parators, a most significant 4-bit ADC and a least significant 4-bit ADC. The input to the ADC0820 is tracked and held by the input sampling circuitry eliminating the need for an external sample-and-hold for signals moving at less than 100 m V/µs. For ease of interface to microprocessors, the ADC0820 has been designed to appear as a memory location or I/O port without the need for external interfacing logic. Features n n n n n n n n n 8 Bits 2.5 µs Max (RD Mode) n n n n n n Built-in track-and-hold function No missing codes No external clocking Single supply - 5 VDC Easy interface to all microprocessors, or operates stand-alone Latched TRI-STATE ® output Logic inputs and outputs meet both MOS and T2L voltage level specifications Operates ratiometrically or with any reference value equal to or less than VCC 0V to 5V analog input voltage range with single 5V supply No zero or full-scale adjust required Overflow output available for cascading 0.3" standard width 20-pin DIP 20-pin molded chip carrier package 20-pin small outline package 20-pin shrink small outline package (SSOP) Key Specifications n Resolution n Conversion Time n Low Power n Total Unadjusted Error 1.5 µs Max (WR-RD Mode) 75 m W Max ± 1⁄2 LSB and ± 1 LSB Connection and Functional Diagrams Dual-In-Line, Small Outline and SSOP Packages Molded Chip Carrier Package DS005501-1 DS005501-33 Top View TRI-STATE ® is a registered trademark of National Semiconductor Corporation. © 1999 National Semiconductor Corporation DS005501 .national. Connection and Functional Diagrams (Continued) DS005501-2 FIGURE 1. Ordering Information Part Number ADC0820BCV ADC0820BCWM ADC0820BCN ADC0820CCJ ADC0820CCWM ADC0820CIWM ADC0820CCN Total Unadjusted Error V20A - Molded Chip Carrier Package Temperature Range 0˚C to +70˚C 0˚C to...