MX7821KEWP ,660ns レP-Compatible, 8-Bit ADC with Track/HoldFeatures
. 660ns Conversion Time
. 20-Pin Narrow DIP Package
. No External Clock
. Pin-Compat ..
MX7821KN ,660ns レP-Compatible, 8-Bit ADC with Track/HoldGeneral Description
The MX7821 high-speed, rnicroprocessor-compatible
(PP), 8-bit analog-to-dig ..
MX7821KR ,660ns レP-Compatible, 8-Bit ADC with Track/HoldELECTRICAL CHARACTERISTICS
(VDD = +5V i5%; GND = 0V; Unipolar Input Range: Vss = 0V, VREF+ = 5V, ..
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MX7824KCWG-T ,CMOS, High-Speed, 8-Bit ADC with 4- or 8-Channel MultiplexerApplications1MX7824LCWG 0°C to +70°C 24 Wide SO ± /2Digital Signal ProcessingMX7824KCWG 0°C to +70° ..
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MX7821KEWP-MX7821KN-MX7821KR
660ns レP-Compatible, 8-Bit ADC with Track/Hold
19-4330: Rev l,' 7/95
2AyaADCILAlA]
660ns wlP-ittompairtlbte,
B-Bit ADC with 1rraehllyilotdl
General Description
The MX7821 high-speed, rnicroprocessor-compatible
(pP), 8-bit analog-to-digital converter (ADC) is a plug-in
upgrade for the industry-standard 7820. The MX7821
uses a half-flash technique, resulting in a 660ns conver-
sion time vs, 1.36us for the 7820, A Vss pin, not supplied
by the 7820, supports dual power supplies and bipolar
analog inputs,
The MX7821 has track-and-hold function capable of
digitizing a 100kHz signal, and is tested for both its static
and dynamic capability. The converter-PP interface ap-
pears as a memory location or input/output port that
requires no external interface logic. The data outputs use
latched, three-state buffered circuitry for direct connec-
tion to a WP data bus or system input port. The MX7821
has an overflow output for cascading devices to attain
higher resolution. The ADC's input/reference arrange-
ment enables ratiometric operation. For a detailed de-
scription of MX7821 operation, refer to the MX782O data
sheet.
Applications
Digital-Signal Processing
High-Speed Data Acquisition
Telecommunications
High-Speed Servo Loops
Audio Systems
Functional Diagram
Features
. 660ns Conversion Time
. 20-Pin Narrow DIP Package
. No External Clock
. Pin-Compatible Upgrade for
Industry-Standard 7820
. 100kHz Input Signal Bandwidth
. Bipolar/Unlpolar Inputs
. Single +5V or Dual tSV Supplies
. Ratlometrlc Reference Inputs
. Static and Dynamic Tested
. InternaITrack/Hold
Ordering Information
PART TEMP. RANGE PlN-PACKAGE
MX7821KN " to +70°C 20 Plastic DIP
MX7821KR JC to +70'C 20 Wide so
MX7821KP 0°C to +70'C 20 PLCC
MX7821K/D 0°C to +70°C Dice'
MX7821BO -40°C to +850 20 CERDIP
MX7821KEWP -40°C to +85°C 20 Wide SO
MX7821TE -55°C to +125°C 20 LCC'"
MX7821TQ -55"C to +125°C 20 CERDIP"
. Contact factory for dice specifications.
" Contact factory for availability and processing to MIL -STD-883.
Pin Configurations
WEF+ 2
THREE; DATA
4-8IT STATE OUT
q 0A0 DRIVERS PINS
(ALSB)
MX7821
TIMING AND CONTROL
CIRCUITRY
t1075138919
(N) MODE W_R/RDY 6 RD W e
TO VIEW . V
VIN I E V09
00 E E Vss
D1 E G] m
02E MAXIM E D7(MSB)
03 E MX7821 E 06
WINDY s E 05
MODE 7 iE 04
y, 8 Es] tTi
W 9 E] VREF+
GND 10 E VREF-
DIP/SO
Pt cc and L00 on last page
Maxim Integrated Products 1
Call toll free 1-800-998-8800 for free samples or literature.
fl-ZBLXW
[WX78211
660ns wlPAtompat'ilMe,
8-1311 AIM With Track/Hold
ABSOLUTE MAXIMUM RATINGS
V00 to GND ............................ -O.3V to +7V
Vssto GND ............................ q0.3V to -7V
Digital Output Voltage to GND
(Pins 2-5, 9, 14-16, 18) ............... -0.3V to VDD +0.3V
VREF+ to AGND ................. Vss AYBN to VDD +0.3V
VREF- to AGND .................. Vss -0.3V to VDD +0.31/
VIN to GND ....................... Vss -0.3V to VDD +0.3V
Continuous Power Dissipation (any package)
to +75°C '.r__Fr'.'FF'_'__'_'''..P'..'r'''.F 1000mW
derate above +75'C by ...................... 10mW/°C
Operating Temperature Ranges:
MX7821K - ........................... 0''C to +70'C
MX7821B - ........................... -40°C to +850
MX7821T - .......................... -55°C to +125'C
Storage Temperature Range ............ Ai5'C to +150'C
Lead Temperature (soldering , 10 sec) ............ +300°C
Stresses S/gf, those listed under Vlbsolute Maximum Ratings' may gauge permanent damage to the device. These are stress ratings only, and functional
operation a the device at these or any other conditions beyond those Indicated In the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS
(VDD = +5V t5%; GND = 0V; Unipolar Input Range: Vss = 0V, VREF+ = 5V, VREF- = 0V; Bipolar Input Range: Vss = -5V i5%,
VREF+ = 2.5V. VREF- = -2.5V; specifications apply for RD mode, Pin 7 = 0V; TA =TMIN to TMAX, unless otherwise noted.) (Note 1)
PARAMETER T SYMBOL l CONDITIONS MIN TYP MAX UNITS
UNIPOLAR INPUT RANGE _
Resolution N 8 . Bits
Total Unadjusted Error (Note 2) TUE tl LSB
No Missing Codes Resolution 8 Bits
BIPOLAR INPUT RANGE
Resolution N 8 Bits
Zero-Code Error Al LSB
Full-Scale Error 11 LSB
Signal-to-Noise Ratio SNR "dltied5=k22llizscale sine wave with 45 dB
Total Harmonic Distortion THD )tc;ed5-l1"si2llii'e sine wave with -50 dB
Peak Harmonic or Spurious Noise "gU-,,ed5ltisi2dirale sine wave with -50 dB
fa(84.72kHz) and 2nd-order terms ~50
Intermodulation Distortion IMD 'gifl4da7vtlzv)vitttlissjti, dB
ING = 500kHz 3rd-order terms -50
Slew Rate, Tracking 2.36 1.6 V/us
REFERENCE INPUT
Input Resistance Resistance between VREF+ and VREF- 1 4 kn
VREF+ Input Range VREF- VDD V
l/REF- Input Range Vss VREF+ V
ANALOG INPUT ,
Input Voltage Range VREF- VREF+ V I
Input Leakage Current -5V s VIN s SV 13 11A
Input Capacitance CIN _ 32 pF I
