CONVERTER. ADS820 Datasheet

ADS820 Datasheet PDF


Part

ADS820

Description

ANALOG-TO-DIGITAL CONVERTER

Manufacture

etcTI

Page 20 Pages
Datasheet
Download ADS820 Datasheet


ADS820 Datasheet
ADS820U
ADS820
SBAS037B – DECEMBER 1995 – REVISED FEBRUARY 2005
10-Bit, 20MHz Sampling
ANALOG-TO-DIGITAL CONVERTER
FEATURES
q NO MISSING CODES
q INTERNAL REFERENCE
q LOW DIFFERENTIAL LINEARITY ERROR:
0.2LSB
q LOW POWER: 195mW
q HIGH SNR: 60dB
q WIDEBAND TRACK/HOLD: 65MHz
APPLICATIONS
q SET-TOP BOXES
q CABLE MODEMS
q VIDEO DIGITIZING
q CCD IMAGING
Camcorders
Copiers
Scanners
Security Cameras
q IF AND BASEBAND DIGITIZATION
DESCRIPTION
The ADS820 is a low-power, monolithic 10-bit, 20MHz Ana-
log-to-Digital (A/D) converter utilizing a small geometry CMOS
process. This complete converter includes a 10-bit quantizer
with internal track-and-hold, reference, and a power down
feature. It operates from a single +5V power supply and can
be configured to accept either differential or single-ended
input signals.
The ADS820 employs digital error correction to provide excel-
lent Nyquist differential linearity performance for demanding
imaging applications. Its low distortion, high SNR, and high
oversampling capability give it the extra margin needed for
telecommunications and video applications.
This high performance converter is specified for AC and
DC-performance at a 20MHz sampling rate. The ADS820
is available in an SO-28 package.
CLK
MSBI
OE
Timing
Circuitry
IN
IN
REFT
CM
REFB
T&H
+3.25V
Pipeline
A/D
Error
Correction
Logic
3-State
Outputs
10-Bit
Digital
Data
+1.25V
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
All trademarks are the property of their respective owners.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
www.ti.com
Copyright © 1995-2005, Texas Instruments Incorporated

ADS820 Datasheet
ABSOLUTE MAXIMUM RATINGS(1)
+VS ....................................................................................................... +6V
Analog Input ............................................................ 0V to (+VS + 300mV)
Logic Input ............................................................... 0V to (+VS + 300mV)
Case Temperature ......................................................................... +100°C
Junction Temperature .................................................................... +150°C
Storage Temperature .................................................................... +125°C
External Top Reference Voltage (REFT) ................................. +3.4V Max
External Bottom Reference Voltage (REFB) ............................ +1.1V Min
NOTES: (1) Stresses above these ratings may cause permanent damage.
Exposure to absolute maximum conditions for extended periods may degrade
device reliability.
ELECTROSTATIC
DISCHARGE SENSITIVITY
This integrated circuit can be damaged by ESD. Texas Instru-
ments recommends that all integrated circuits be handled with
appropriate precautions. Failure to observe proper handling
and installation procedures can cause damage.
ESD damage can range from subtle performance degradation
to complete device failure. Precision integrated circuits may be
more susceptible to damage because very small parametric
changes could cause the device not to meet its published
specifications.
PACKAGE/ORDERING INFORMATION(1)
PRODUCT
ADS820
"
PACKAGE-LEAD
SO-8
"
PACKAGE
DESIGNATOR
DW
"
SPECIFIED
TEMPERATURE
RANGE
40°C to +85°C
"
PACKAGE
MARKING
ADS820U
"
ORDERING
NUMBER
ADS820U
ADS820U/1K
TRANSPORT
MEDIA, QUANTITY
Rails, 28
Tape and Reel, 1000
NOTE: (1) For the most current package and ordering information, see the Package Option Addendum at the end of this document, or see the TI website at
www.ti.com.
ELECTRICAL CHARACTERISTICS
At TA = +25°C, VS = +5V, Sampling Rate = 20MHz, with a 50% duty cycle clock having a 2ns rise/fall time, unless otherwise noted.
PARAMETER
Resolution
Specified Temperature Range
ANALOG INPUT
Differential Full-Scale Input Range
Common-Mode Voltage
Analog Input Bandwidth (3dB)
Small Signal
Full Power
Input Impedance
DIGITAL INPUT
Logic Family
Convert Command
ACCURACY(2)
Gain Error
Gain Tempco
Power-Supply Rejection of Gain
Input Offset Error
Power-Supply Rejection of Offset
CONVERSION CHARACTERISTICS
Sample Rate
Data Latency
DYNAMIC CHARACTERISTICS
Differential Linearity Error
f = 500kHz
f = 10MHz
No Missing Codes
Integral Linearity Error at f = 500kHz
Spurious-Free Dynamic Range (SFDR)
f = 500kHz (1dBFS input)
f = 10MHz (1dBFS input)
CONDITIONS
TAMBIENT
TEMP
20dBFS(1) Input
0dB Input
+25°C
+25°C
Start Conversion
fS = 2.5MHz
+VS = ±5%
+VS = ±5%
+25°C
Full
+25°C
Full
+25°C
+25°C
Full
+25°C
Full
Full
Full
+25°C
Full
+25°C
Full
ADS820U
MIN TYP
10
40
MAX
+85
+1.25
2.25
400
65
1.25 || 4
+3.25
TTL/HCT Compatible CMOS
Falling Edge
±0.6
±1.0
±85
0.01
±2.1
0.02
±1.5
±2.5
0.1
±3.0
0.1
10k 20M
6.5
UNITS
Bits
°C
V
V
MHz
MHz
M|| pF
%
%
ppm/°C
%FSR/%
%
%FSR/%
Sample/s
Convert Cycle
±0.15
±0.15
±0.2
±0.2
Tested
±0.5
±1.0
±1.0
±1.0
±1.0
±2.0
LSB
LSB
LSB
LSB
LSB
67 77
64 74
59 63
57 62
dBFS
dBFS
dBFS
dBFS
NOTE: (1) dBFS refers to dB below Full Scale. (2) Percentage accuracies are referred to the internal A/D Converter Full-Scale Range of 4Vp-p. (3) IMD is
referred to the larger of the two input signals. If referred to the peak envelope signal (0dB), the intermodulation products will be 7dB lower. (4) Based on
(SINAD 1.76)/6.02. (5) No rolloverof bits.
2 ADS820
www.ti.com
SBAS037B


Features Datasheet pdf ADS820U ADS820 SBAS037B – DECEMBER 1 995 – REVISED FEBRUARY 2005 10-Bit, 2 0MHz Sampling ANALOG-TO-DIGITAL CONVERT ER FEATURES q NO MISSING CODES q INTER NAL REFERENCE q LOW DIFFERENTIAL LINEAR ITY ERROR: 0.2LSB q LOW POWER: 195mW q HIGH SNR: 60dB q WIDEBAND TRACK/HOLD: 6 5MHz APPLICATIONS q SET-TOP BOXES q CAB LE MODEMS q VIDEO DIGITIZING q CCD IMAG ING Camcorders Copiers Scanners Securit y Cameras q IF AND BASEBAND DIGITIZATIO N DESCRIPTION The ADS820 is a low-powe r, monolithic 10-bit, 20MHz Analog-to-D igital (A/D) converter utilizing a smal l geometry CMOS process. This complete converter includes a 10-bit quantizer w ith internal track-and-hold, reference, and a power down feature. It operates from a single +5V power supply and can be configured to accept either differen tial or single-ended input signals. The ADS820 employs digital error correctio n to provide excellent Nyquist differen tial linearity performance for demandin g imaging applications. Its low distortion, high SNR, and high over.
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