ANALOG-TO-DIGITAL CONVERTER. ADS821 Datasheet

ADS821 CONVERTER. Datasheet pdf. Equivalent

ADS821 Datasheet
Recommendation ADS821 Datasheet
Part ADS821
Description 10-Bit/ 40MHz Sampling ANALOG-TO-DIGITAL CONVERTER
Feature ADS821; ® ADS ADS 821 E 821 U ADS821 10-Bit, 40MHz Sampling ANALOG-TO-DIGITAL CONVERTER TM FEATURES q N.
Manufacture Burr-Brown Corporation
Datasheet
Download ADS821 Datasheet




Burr-Brown Corporation ADS821
®
ADS821U
ADS821E
ADS821
TM 10-Bit, 40MHz Sampling
ANALOG-TO-DIGITAL CONVERTER
FEATURES
q NO MISSING CODES
q INTERNAL REFERENCE
q LOW POWER: 380mW
q HIGH SNR: 58dB
q INTERNAL TRACK/HOLD
q PACKAGE: 28-Pin SOIC and SSOP
APPLICATIONS
q VIDEO DIGITIZING
q ULTRASOUND IMAGING
q GAMMA CAMERAS
q SET-TOP BOXES
q CABLE MODEMS
q CCD IMAGING
Color Copiers
Scanners
Camcorders
Security Cameras
Fax Machines
q IF AND BASEBAND DIGITIZATION
q TEST INSTRUMENTATION
IN
IN
REFT
CM
REFB
DESCRIPTION
The ADS821 is a low power, monolithic 10-bit, 40MHz
analog-to-digital converter utilizing a small geometry
CMOS process. This COMPLETE converter includes
a 10-bit quantizer with internal track/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 ADS821 employs digital error correction to pro-
vide excellent Nyquist differential linearity perfor-
mance 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 40MHz sampling rate. The
ADS821 is available in 28-pin SOIC and SSOP
packages.
CLK
MSBI
OE
Timing
Circuitry
T/H
+3.25V
Pipeline
A/D
Error
Correction
Logic
3-State
Outputs
10-Bit
Digital
Data
+1.25V
International Airport Industrial Park • Mailing Address: PO Box 11400, Tucson, AZ 85734 • Street Address: 6730 S. Tucson Blvd., Tucson, AZ 85706 • Tel: (520) 746-1111 • Twx: 910-952-1111
Internet: http://www.burr-brown.com/ • FAXLine: (800) 548-6133 (US/Canada Only) • Cable: BBRCORP • Telex: 066-6491 • FAX: (520) 889-1510 • Immediate Product Info: (800) 548-6132
©1995 Burr-Brown Corporation
PDS-1291D
Printed in U.S.A. November, 1996



Burr-Brown Corporation ADS821
SPECIFICATIONS
At TA = +25°C, VS = +5V, Sampling Rate = 40MHz, with a 50% duty cycle clock having a 2ns rise/fall time, unless otherwise noted.
ADS821U (SOIC)
ADS821E (SSOP)
PARAMETER
CONDITIONS
TEMP
MIN TYP MAX MIN TYP MAX
UNITS
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(3)
Gain Error
TAMBIENT
–20dBFS(2) Input
0dBFS Input
Start Conversion
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
Delta +VS = ±5%
Delta +VS = ±5%
tH = 13ns(4)
f = 12MHz
No Missing Codes
Integral Linearity Error at f = 500kHz
Spurious-Free Dynamic Range (SFDR)
f = 500kHz (–1dBFS input)
f = 12MHz (–1dBFS input)
Two-Tone Intermodulation Distortion (IMD)(5)
f = 4.4MHz and 4.5MHz (–7dBFS each tone)
Signal-to-Noise Ratio (SNR)
f = 500kHz (–1dBFS input)
f = 12MHz (–1dBFS input)
Signal-to-(Noise + Distortion) (SINAD)
f = 500kHz (–1dBFS input)
f = 12MHz (–1dBFS input)
Differential Gain Error
Differential Phase Error
Effective Bits(6)
Aperture Delay Time
Aperture Jitter
Overvoltage Recovery Time(7)
NTSC or PAL
NTSC or PAL
fIN = 3.58MHz
1.5x Full Scale Input
+25°C
+25°C
+25°C
Full
+25°C
Full
+25°C
+25°C
0°C to +70°C
+25°C
0°C to +70°C
0°C to +70°C
0°C to +70°C
+25°C
Full
+25°C
Full
+25°C
Full
+25°C
Full
+25°C
Full
+25°C
Full
+25°C
Full
+25°C
+25°C
+25°C
+25°C
+25°C
+25°C
10
–40 +85
+1.25
+3.25
2.25
120
65
1.25 || 4
TTL/HCT Compatible CMOS
Falling Edge
±0.6 ±1.5
±1.1 ±2.5
±85
0.01 0.15
±2.1 ±3.5
0.02 0.15
10k 40M
6.5
±0.5
±0.6
±0.5
±0.6
Guaranteed
±0.5
±1.0
±1.0
±1.0
±1.0
±2.0
60 70
54 67
58 63
54 62
–61
–60
57 59
55 59
56 58
54 58
56 58.5
52 58
53 57
50 56
0.5
0.1
9.3
2
7
2
T(1)
T
T
T
T
T
T Bits
T °C
TV
V
MHz
MHz
M|| pF
TTL/HCT Compatible CMOS
Falling Edge
TT
TT
T
TT
TT
TT
%
%
ppm/°C
%FSR/%
%
%FSR/%
T T Sample/s
T Convert Cycle
T
T
T
T
T
T
TT
TT
TT
TT
T
T
55 T
53 T
54 T
52 T
TT
TT
TT
TT
T
T
T
T
T
T
T LSB
T LSB
T LSB
T LSB
T LSB
dBFS
dBFS
dBFS
dBFS
dBc
dBc
dB
dB
dB
dB
dB
dB
dB
dB
%
degrees
Bits
ns
ps rms
ns
NOTE: (1) An asterisk (T) indicates same specifications as the ADS821U. (2) dBFS refers to dB below Full Scale. (3) Percentage accuracies are referred to
the internal A/D Full Scale Range of 4Vp-p. (4) Refer to Timing Diagram footnotes for the differential linearity performance conditions for the SOIC and SSOP
packages. (5) 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.
(6) Based on (SINAD – 1.76)/6.02. (7) No “rollover” of bits.
The information provided herein is believed to be reliable; however, BURR-BROWN assumes no responsibility for inaccuracies or omissions. BURR-BROWN assumes
no responsibility for the use of this information, and all use of such information shall be entirely at the user’s own risk. Prices and specifications are subject to change
without notice. No patent rights or licenses to any of the circuits described herein are implied or granted to any third party. BURR-BROWN does not authorize or warrant
any BURR-BROWN product for use in life support devices and/or systems.
®
ADS821
2



Burr-Brown Corporation ADS821
SPECIFICATIONS (CONT)
At TA = +25°C, VS = +5V, Sampling Rate = 40MHz, with a 50% duty cycle clock having a 2ns rise/fall time, unless otherwise noted.
PARAMETER
OUTPUTS
Logic Family
Logic Coding
Logic Levels
3-State Enable Time
3-State Disable Time
POWER SUPPLY REQUIREMENTS
Supply Voltage: +VS
Supply Current: +IS
Power Consumption
Thermal Resistance, θJA
T Specifications same as ADS821U.
CONDITIONS
Logic Selectable
Logic “LO”,
CL = 15pF max
Logic “HI”,
CL = 15pF max
Operating
Operating
Operating
Operating
Operating
TEMP
Full
Full
Full
Full
+25°C
Full
+25°C
Full
ADS821U (SOIC)
MIN TYP MAX
ADS821E (SSOP)
MIN TYP MAX
TTL/HCT Compatible CMOS
SOB or BTC
0 0.4
+2.5
20
2
+VS
40
10
+4.75 +5 +5.25
76 88
78 90
380 440
390 450
75
TTL/HCT Compatible CMOS
SOB or BTC
TT
TT
TT
TT
TTT
TTT
TTT
TTT
TTT
50
UNITS
V
V
ns
ns
V
mA
mA
mW
mW
°C/W
ABSOLUTE MAXIMUM RATINGS
+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
NOTE: Stresses above these ratings may permanently damage the device.
PACKAGE/ORDERING INFORMATION
PRODUCT
PACKAGE
PACKAGE
DRAWING TEMPERATURE
NUMBER(1)
RANGE
ADS821U
ADS821E
28-Pin SOIC
28-Pin SSOP
217 –40°C to +85°C
324 –40°C to +85°C
NOTE: (1) For detailed drawing and dimension table, please see end of data
sheet, or Appendix C of Burr-Brown IC Data Book.
ELECTROSTATIC
DISCHARGE SENSITIVITY
This integrated circuit can be damaged by ESD. Burr-Brown
recommends that all integrated circuits be handled with ap-
propriate precautions. Failure to observe proper handling and
installation procedures can cause damage.
Electrostatic discharge can cause damage ranging from
performance degradation to complete device failure. Burr-
Brown Corporation recommends that all integrated circuits be
handled and stored using appropriate ESD protection
methods.
®
3 ADS821







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