ADC0820CCM+ ,CMOS High-Speed 8-Bit A/D Converter with Track/Hold FunctionFeatures
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ADC0820CCM+
CMOS High-Speed 8-Bit A/D Converter with Track/Hold Function
79-0889. Rev I 7/96
2fllALh2aLAlA
GM0S High Speed B-Bit A/ID Converter
- General Description
The ADC0820 is a high speed, microprocessor com-
patible, 8 bit analog-to-digital converter which uses a
half-flash technique to achieve a conversion time of
1.4 ps. The converter has a 0V to +5V analog input
range and uses a single +5V supply.
A built-in track-and-hold function is included, elimi-
nating the need for an external track-and-hold for
input slew rates up to 100mNOs.
The NO easily interfaces with microprocessors by
appearing as a memory location or l/O port without
the need for external interfacing logic. Data outputs
use latched, three-state buffer circuitry to allow direct
connection to a microprocessor data bus or system
I/O port. An over-flow output is also provided for
cascading devices to achieve higher resolution.
Maxim's ADC0820 is pin-compatible with National
Semiconductor's ADCO820 and provides improved
specifications. It is packaged in 20-pin Small Outline,
DIP and CERDIP packages.
Applications
Digital Signal Processing
High Speed Data Acquisition
Telecommunications
High Speed Servo Loops
with 1l1rackllyilolidl Function
Features
. Fast Conversion Time: 1.4ps Max.
t Built-ln Track-and-Hold Function
. No Missing Codes
. No User Adjustments Required
. Single +5V Supply
. No External Clock
0 Easy Interface To Microprocessors
Ordering Informa tion
PART TEMP. RANGE PIN-PACKAGE (12;)
ADC0820BCN on C to +70'' C 20 Plastic DIP 1 1/2
ADCO820CCN (Y' C to +700 C 20 Plastic DIP tl
ADC0820CC/D 0° C to +700 C Dice' tl
ADC082OBCM 0° C to +700 C 20 so t l/e
ADC0820CCM o: C to +70" C 20 so :1/2
ADC0820BCJ -40° C to +85” C 20 CERDIP 11/2
ADC0820CCJ 4100 C to +8Y C 20 CERDIP tl
ADCOB2OBJ -550 C to +1250 C 20 CERDIP" t 1/2
ADCO82OCJ EY C to +125° C 20 CERDIP" tl
Audio Systems
Functional Block Diagram
"Dice are specified at TA = +25 "C
. 'Contact factory
Pin Configuration
Top View
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For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim's website at .
http://www.
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CMOS High Speed 8-Bit A/D Converter
with '1h'ackllyilolidl Function
ABSOLUTE MAXIMUM RATINGS
Supply Voltage, VDD to GND ........................ OV, +1ov Operating Temperature Ranges
Voltage at any other pins ADC0820BCUCC, .............................................. 0°C to +70°C
(Pins 1-9, 11-19) .................... GND - 0.3V, VDD +0.31/ ADC0820BCJ/CCJ .t.r.....FFr.FF...rrrr._rrr._r_Fg.FFFtm_mF -40°C to +85°C
Output current (Pin 19) ................................ 30mA ADC08020BJ/CJ ............................................ -55°C to +125°C
Power Dissipation (Any Package) to +75°C ............ 450mw Storage Temperature Range ............................. -65°C to +160°C
Derate Above 125°C by ........................... 6mW/°C Lead Temperature (soldering, 10sec) ............................. +300°C
Stresses above those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. These are stress ratings only, and functional
Operation ol the device at these or any other conditions above those indicated in the operational sections of the specification is not implied. E xposure to
absolute max1mum ratings conditions for extended periods may affect the device reliability.
ELECTRICAL CHARACTERISTICS
(VDD = +5V. VREF+ = HN, VREF- = GND, RD-MODE, TA =
TMIN to TMAX, unless otherwise noted)
PARAMETER l SYMBOL l CONDITIONS MIN. TYP. MAX. UNITS
ACCURACY
Resolution 1 8 bits
Total Unadjusted Error (Note 1) 1 23883383 :142 LSB
No Missing Codes Resolution 1 8 bits
REFERENCE INPUT
Reference Resistance P f 350% T 11:5 2.2 :3 kn
A - MIN MAX . .
V122 Input Voltage Range 1 VREF‘ Vor: ' 0.1 V
VREF' Input Voltage Range i 1 GND - 0.1 VREH V
ANALOG INPUT
Analog Input Voltage Range V GND - 0.1 V + 0.1 V
Analog Input Capacitance Cvm 45 pF
Analog Input Current 'vm Vm = 0V to +5V $3": 'tei',,', i333 pA
Slew Rate, Tracking (Note 2) SR 0.2 0.1 V/ps
LOGIC INPUTS
: Input HIGH Voltage vINN agén- RD ff, v
Input LOW Voltage \/INL gglngR' RD te' V
- - T = +25°c 0.1
CS. RD A
TMIN to TMAX 1
Input High Current IINH IT/A; 'd,", 'tei,,, li' PA
T, = +25°C 50 150
MODE TMIN to TMAX 200
- - -- = .
Input Low Current 1M cs, R wn. MODE l" 'ere ‘of PA
MIN MAX -
Input Capacitance (Note 3) CIN _3 At5,W/A- MODE 5 8 pF
LOGIC OUTPUTS
DB0-DB7, tm., tTFT
Output HIGH Voltage Vor, VDD = +4.75V Iour = -360PA 4.0 V
VDD = +4.75v IOUT = -IOA 4.5
DB0-DB7, OF W. RDY
Output LOW Voltage V01. VDD = 'MI) four = 1.6mA 0.4 V
Three-state Output Current DB0-DB7, RDY T't, = 35.;0 Ili' li' “A
MIN MAX -
Output Capacitance (Note 3) COUT DB0-DB7, OF FLW T.RDY 5 8 pF
Output Source Current ISRC DB0-DB7, -OTT., TFFT: Til/our = o -25 -10 mA
Output Sink Current ISINK DB0-DB7, TUWT, T,RDY; Vour= Vim 40 15 mA
2 MAXIM
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