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National Semiconductor
National Semiconductor

ADC0820 Datasheet

8-Bit High Speed P Compatible A/D Converter with Track/Hold Function


ADC0820 Datasheet Preview


June 1999
ADC0820
8-Bit High Speed µP Compatible A/D Converter with
Track/Hold Function
General 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 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 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 has
been designed to appear as a memory location or I/O port
without the need for external interfacing logic.
Key Specifications
n Resolution
n Conversion Time
n Low Power
n Total Unadjusted
Error
8 Bits
2.5 µs Max (RD Mode)
1.5 µs Max (WR-RD Mode)
75 mW Max
±12 LSB and ± 1 LSB
Features
n Built-in track-and-hold function
n No missing codes
n No external clocking
n Single supply — 5 VDC
n Easy interface to all microprocessors, or operates
stand-alone
n Latched TRI-STATE® output
n Logic inputs and outputs meet both MOS and T2L
voltage level specifications
n Operates ratiometrically or with any reference value
equal to or less than VCC
n 0V to 5V analog input voltage range with single 5V
supply
n No zero or full-scale adjust required
n Overflow output available for cascading
n 0.3" standard width 20-pin DIP
n 20-pin molded chip carrier package
n 20-pin small outline package
n 20-pin shrink small outline package (SSOP)
Connection and Functional Diagrams
Dual-In-Line, Small Outline
and SSOP Packages
Molded Chip Carrier
Package
Top View
DS005501-1
TRI-STATE® is a registered trademark of National Semiconductor Corporation.
© 1999 National Semiconductor Corporation DS005501
DS005501-33
www.national.com
Page 1

Connection and Functional Diagrams (Continued)
Ordering Information
FIGURE 1.
DS005501-2
Part Number
ADC0820BCV
ADC0820BCWM
ADC0820BCN
ADC0820CCJ
ADC0820CCWM
ADC0820CIWM
ADC0820CCN
Total
Unadjusted Error
±12 LSB
±1 LSB
Package
V20A — Molded Chip Carrier
M20B — Wide Body Small Outline
N20A — Molded DIP
J20A — Cerdip
M20B — Wide Body Small Outline
M20B — Wide Body Small Outline
N20A — Molded DIP
Temperature
Range
0˚C to +70˚C
0˚C to +70˚C
0˚C to +70˚C
−40˚C to +85˚C
0˚C to +70˚C
−40˚C to +85˚C
0˚C to +70˚C
www.national.com
2
Page 2

Absolute Maximum Ratings (Notes 1, 2)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
Supply Voltage (VCC)
Logic Control Inputs
Voltage at Other Inputs and Output
Storage Temperature Range
Package Dissipation at TA = 25˚C
Input Current at Any Pin (Note 5)
Package Input Current (Note 5)
ESD Susceptability (Note 9)
Lead Temp. (Soldering, 10 sec.)
Dual-In-Line Package (plastic)
10V
−0.2V to VCC +0.2V
−0.2V to VCC +0.2V
−65˚C to +150˚C
875 mW
1 mA
4 mA
1200V
260˚C
Dual-In-Line Package (ceramic)
Surface Mount Package
Vapor Phase (60 sec.)
Infrared (15 sec.)
300˚C
215˚C
220˚C
Operating Ratings (Notes 1, 2)
Temperature Range
ADC0820CCJ
ADC0820CIWM
ADC0820BCN, ADC0820CCN
ADC0820BCV
ADC0820BCWM, ADC0820CCWM
VCC Range
TMINTATMAX
−40˚CTA+85˚C
−40˚CTA+85˚C
0˚CTA70˚C
0˚CTA70˚C
0˚CTA70˚C
4.5V to 8V
Converter Characteristics
The
fied.
following specifications
Boldface limits apply
apply
from
for RD
TMIN to
mode (pin
TMAX; all
o7th=e0r),liVmCitCs=T5AV=,TVj=R2E5F(˚+C).=
5V,and
VREF(−)=GND
unless
otherwise
speci-
Parameter
Conditions
ADC0820CCJ
ADC0820BCN, ADC0820CCN
ADC0820BCV, ADC0820BCWM
Limit
Units
ADC0820CCWM, ADC0820CIWM
Typ Tested Design Typ
Tested
Design
(Note 6)
Limit
Limit
(Note 6)
Limit
Limit
(Note 7) (Note 8)
(Note 7)
(Note 8)
Resolution
8 8 8 Bits
Total Unadjusted
ADC0820BCN, BCWM
±12 ±12 LSB
Error
ADC0820CCJ
±1
LSB
(Note 3)
ADC0820CCN, CCWM, CIWM,
±1 ±1 LSB
ADC0820CCMSA
±1 ±1 LSB
Minimum Reference
2.3 1.00
2.3 1.2
k
Resistance
Maximum Reference
2.3 6
2.3 5.3
6 k
Resistance
Maximum VREF(+)
Input Voltage
VCC
VCC
VCC
V
Minimum VREF(−)
Input Voltage
GND
GND
GND
V
Minimum VREF(+)
Input Voltage
VREF(−)
VREF(−)
VREF(−)
V
Maximum VREF(−)
Input Voltage
VREF(+)
VREF(+)
VREF(+)
V
Maximum VIN Input
Voltage
VCC+0.1
VCC+0.1
VCC+0.1
V
Minimum VIN Input
Voltage
GND−0.1
GND−0.1
GND−0.1
V
Maximum Analog
Input Leakage
Current
Power Supply
Sensitivity
CS =VCC
VIN=VCC
VIN=GND
VCC=5V±5%
±1/16
3
−3
±14
±1/16
0.3
−0.3
±14
3 µA
−3 µA
±14 LSB
3 www.national.com
Page 3

DC Electrical Characteristics
The following specifications
limits TA=TJ=25˚C.
apply
for
VCC=5V,
unless
otherwise
specified.
Boldface
limits
apply
from
TMIN
to
TMAX;
all
other
Parameter
Conditions
ADC0820CCJ
ADC0820BCN, ADC0820CCN
ADC0820BCV, ADC0820BCWM
Limit
Units
ADC0820CCWM, ADC0820CIWM
Typ
Tested
Design
Typ
Tested
Design
(Note 6)
Limit
Limit
(Note 6)
Limit
Limit
(Note 7) (Note 8)
(Note 7)
(Note 8)
VIN(1), Logical “1”
Input Voltage
VCC=5.25V
CS , WR , RD
Mode
2.0
3.5
2.0 2.0 V
3.5 3.5 V
VIN(0), Logical “0”
Input Voltage
VCC=4.75V
CS , WR , RD
Mode
0.8
1.5
0.8 0.8 V
1.5 1.5 V
IIN(1), Logical “1”
Input Current
IIN(0), Logical “0”
Input Current
VIN(1)=5V; CS , RD
VIN(1)=5V; WR
VIN(1)=5V; Mode
VIN(0)=0V; CS , RD , WR ,
Mode
0.005
0.1
50
−0.005
1
3
200
−1
0.005
0.1
50
−0.005
0.3
170
1 µA
3 µA
200 µA
−1 µA
VOUT(1), Logical “1”
Output Voltage
VCC=4.75V, IOUT=−360 µA;
DB0–DB7, OFL , INT
2.4
2.8 2.4 V
VCC=4.75V, IOUT=−10 µA;
DB0–DB7, OFL , INT
4.5
4.6 4.5 V
VOUT(0), Logical “0”
Output Voltage
VCC=4.75V, IOUT=1.6 mA;
DB0–DB7, OFL , INT , RDY
0.4
0.34 0.4 V
IOUT, TRI-STATE
Output Current
ISOURCE, Output
Source Current
VOUT=5V; DB0–DB7, RDY
VOUT=0V; DB0–DB7, RDY
VOUT=0V; DB0–DB7, OFL
INT
0.1
−0.1
−12
−9
3
−3
−6
−4.0
0.1
−0.1
−12
−9
0.3
−0.3
−7.2
−5.3
3
−3
−6
−4.0
µA
µA
mA
mA
ISINK, Output Sink
Current
VOUT=5V; DB0–DB7, OFL ,
INT , RDY
14 7
14 8.4
7 mA
ICC, Supply Current
CS =WR =RD =0
7.5 15
7.5 13
15 mA
AC Electrical Characteristics
The following specifications apply for VCC=5V, tr=tf=20 ns, VREF(+)=5V, VREF(−)=0V and TA=25˚C unless otherwise speci-
fied.
Typ
Tested
Design
Parameter
Conditions
(Note 6)
Limit
Limit
Units
(Note 7)
(Note 8)
tCRD, Conversion Time for RD
Mode
Pin 7 = 0, Figure 2
1.6
2.5 µs
tACC0, Access Time (Delay from
Falling Edge of RD to Output
Valid)
Pin 7 = 0, Figure 2
tCRD+20
tCRD+50
ns
tCWR-RD, Conversion Time for
WR-RD Mode
tWR, Write Time
Min
Max
Pin 7 = VCC; tWR = 600 ns,
tRD=600 ns; Figures 3, 4
Pin 7 = VCC; Figures 3, 4
(Note 4) See Graph
1.52
µs
600
50
ns
µs
tRD, Read Time
Min
tACC1, Access Time (Delay from
Falling Edge of RD to Output
Valid)
Pin 7 = VCC; Figures 3, 4
(Note 4) See Graph
Pin 7 = VCC, tRD<tI; Figure 3
CL=15 pF
600 ns
190 280 ns
CL=100 pF
210 320 ns
www.national.com
4
Page 4
Part Number ADC0820
Manufactur National Semiconductor
Description 8-Bit High Speed P Compatible A/D Converter with Track/Hold Function
Total Page 22 Pages
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