1FEATURES

2• 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 V CC

• 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 in. Standard Width 20-Pin PDIP

• 20-Pin PLCC

• 20-Pin SOIC

KEY SPECIFICATIONS

• Resolution: 8 Bits

• Conversion Time

– 2.5 μs Max (RD Mode)

– 1.5 μs Max (WR-RD Mode)

• Low Power: 75 mW Max

• Total Unadjusted Error: ±½ LSB and ± 1 LSB

DESCRIPTION

By using a half-flash conversion technique, the 8-bit

ADC0820-N CMOS A/D offers a 1.5 μs conversion

time and dissipates only 75 mW of power. The half-

flash technique consists of 32 comparators, a most

significant 4-bit ADC and a least significant 4-bit

ADC.

The input to the ADC0820-N 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 mV/μs.

For ease of interface to microprocessors, the

ADC0820-N has been designed to appear as a

memory location or I/O port without the need for

external interfacing logic.