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ADC0820CNED Schematic ( PDF Datasheet ) - NXP Semiconductors

Teilenummer ADC0820CNED
Beschreibung 8-Bit/ high-speed/ mP-compatible A/D converter with track/hold function
Hersteller NXP Semiconductors
Logo NXP Semiconductors Logo 




Gesamt 14 Seiten
ADC0820CNED Datasheet, Funktion
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—5VDC
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 VDD
0V to 5V analog input voltage range with single 5V supply
No zero- or full-scale adjust required
Overflow output available for cascading
0.3standard 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
VIN 1
DB0 2
DB1 3
DB2 4
DB3 5
WR/RDY 6
MODE 7
RD 8
INT 9
GND 10
20 VDD
19 NC
18 OFL
17 DB7
16 DB6
15 DB5
14 DB4
13 CS
12 VREF(+)
11 VREF(–)
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






ADC0820CNED Datasheet, Funktion
Philips Semiconductors Linear Products
8-Bit, high-speed, µP-compatible A/D converter with
track/hold function
Product specification
ADC0820
3-STATE TEST CIRCUITS AND WAVEFORMS
t1H
VDD
RD
CS
CL
10pF
DATA
OUTPUT
1K
t0H
VCC
VCC
RD
CS
1k
DATA
OUTPUT
CL
10pF
VCC
RD
GND
tR
90%
50%
10%
VOH
DATA
OUTPUTS
GND
tR = 20ns
t1H
90%
VDD
RD
GND
VDD
DATA
OUTPUTS
GND
tR
90%
50%
10%
t0H
10%
MODE = LOW
CS
RD
RDY
(OUTPUT)
INT
DB0–DB7
OFL
tRDY
WITH
EXTERNAL
PULL–UPtINRT, CH
tCRD
tACCO
VALID DATA
Figure 1. RD Mode
tP
t1H, 0H
August 31, 1994
573

6 Page









ADC0820CNED pdf, datenblatt
Philips Semiconductors Linear Products
8-Bit, high-speed, µP-compatible A/D converter with
track/hold function
Product specification
ADC0820
12pF
RS
VIN
RON
TO LSB
R–LADDER
RON
1pF
1pF
15 LSB COMPARATORS
RON
RON
1pF
TO LSB
R–LADDER
1pF
a.
Figure 10.
RS
VIN
350
CS
12pF
31pF
b.
August 31, 1994
579

12 Page





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