ADC0820 Datasheet, PDF (1/14 Pages) National Semiconductor (TI) – 8-Bit High Speed μP Compatible A/D Converter with Track/Hold Function

Philips Semiconductors Linear Products
8-Bit, high-speed, µP-compatible A/D converter
with track/hold function
Product specification
ADC0820
DESCRIPTION
By using a half-flash conversion technique, the 8-bit ADC0820
CMOS A/D offers a 1.5µs conversion time while dissipating a
maximum 75mW of power. The half-flash technique consists of 31
comparators, 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 slewing at less than 100mV/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
• Built-in track-and-hold function
• No missing codes
• No external clocking
• Single supply—5V_DC
• Easy interface to all microprocessors, or operates stand-alone
• Latched 3-State outputs
• Logic inputs and outputs meet both MOS and TTL voltage level
specifications
• Operates ratiometrically or with any reference value equal to or
less than V_DD
• 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
ORDERING INFORMATION
DESCRIPTION
20-Pin Plastic Dual In-Line Package (DIP)
20-Pin Plastic Small Outline (SO) package
PIN CONFIGURATION
D, F, N Packages
V_IN 1
DB0 2
DB1 ³
DB2 4
DB3 ⁵
WR/RDY 6
MODE 7
RD 8
INT ⁹
GND ¹⁰
20 V_DD
19 _NC
18 OFL
17 DB7
16 DB6
15 DB5
14 DB4
13 ^CS
12 V_REF(+)
11 V_REF(–)
TOP VIEW
APPLICATIONS
• Microprocessor-based monitoring and control systems
• Transducer/µP interface
• Process control
• Logic analyzers
• Test and measurement
TEMPERATURE RANGE
0 to +70°C
0 to +70°C
ORDER CODE
ADC0820CNEN
ADC0820CNED
DWG #
0408B
1021B
August 31, 1994
568
853-1631 13721