Philips Semiconductors Linear Products Product specification
ADC0820
8-Bit, high-speed, µP-compatible A/D converter
with track/hold function
568August 31, 1994 853-1631 13721
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
PIN CONFIGURATION
V
REF
(–)
1
2
3
4
5
6
7
8
9
10 11
12
13
14
20
19
18
17
16
15
V
IN
DB0
DB1
DB2
DB3
WR/RDY
MODE
RD
INT
GND
V
DD
NC
OFL
DB7
DB6
DB5
DB4
CS
V
REF
(+)
TOP VIEW
D, F, N Packages
APPLICATIONS
• Microprocessor-based monitoring and control systems
• Transducer/µP interface
• Process control
• Logic analyzers
• Test and measurement
ORDERING INFORMATION
DESCRIPTION TEMPERATURE RANGE ORDER CODE DWG #
20-Pin Plastic Dual In-Line Package (DIP) 0 to +70°C ADC0820CNEN 0408B
20-Pin Plastic Small Outline (SO) package 0 to +70°C ADC0820CNED 1021B