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PDF ADS931 Data sheet ( Hoja de datos )
| Número de pieza | ADS931 | |
| Descripción | 8-Bit/ 30MHz Sampling ANALOG-TO-DIGITAL CONVERTER | |
| Fabricantes | Burr-Brown Corporation | |
| Logotipo |  |
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®
ADS931E
ADS931
TM 8-Bit, 30MHz Sampling
ANALOG-TO-DIGITAL CONVERTER
FEATURES
q +2.7V TO +5.5V SUPPLY OPERATION
q LOW POWER: 69mW at +3V
q ADJUSTABLE FULL SCALE RANGE WITH
EXTERNAL REFERENCE
q NO MISSING CODES
q POWER DOWN
q 28-LEAD SSOP PACKAGE
APPLICATIONS
q BATTERY POWERED EQUIPMENT
q CAMCORDERS
q PORTABLE TEST EQUIPMENT
q DIGITAL CAMERAS
q COMMUNICATIONS
DESCRIPTION
The ADS931 is a high speed pipelined analog-to-
digital converter that is specified to operate from
standard +5V or +3V power supplies. This converter
includes a high bandwidth track/hold and an 8-bit
quantizer. The performance is specified with a single-
ended input range of 1V to 2V when operating off of
a +3V supply. This device also allows for standard
input ranges such as 2V to 4V or 2V to 3V, when
operating on +5V supplies. The full scale input range
is set by an external reference.
The ADS931 employs digital error correction tech-
niques to provide excellent differential linearity for
demanding imaging applications. Its low distortion and
high SNR give the extra margin needed for telecom-
munications, video and test instrumentation applica-
tions. This high performance A/D converter is speci-
fied for performance at a 30MHz sampling rate. The
ADS931 is available in a 28-Lead SSOP package.
ADS931
CLK
Timing
Circuitry
LVDD
IN T/H
Pipeline
A/D
Error
Correction
Logic
3-State
Outputs
8-Bit
Digital
Data
Reference
Ladder
REFT CM REFB
Pwrdn OE
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
©1996 Burr-Brown Corporation
PDS-11349C
ADS931Printed in U.S.A. March, 1998
®
1 page  
TYPICAL PERFORMANCE CURVES
At TA = +25°C, VS = +3V, specified single-ended input (–1dBFS) and sampling rate = 30MHz, unless otherwise specified.
0
–20
–40
–60
–80
–100
0
SPECTRAL PERFORMANCE
fIN = 500kHz
5 10
Frequency (MHz)
15
0
–20
–40
–60
–80
–100
0
SPECTRAL PERFORMANCE
fIN = 3.58MHz
5 10
Frequency (MHz)
15
0
–20
–40
–60
–80
–100
0
SPECTRAL PERFORMANCE
fIN = 12.5MHz
5 10
Frequency (MHz)
15
0
–20
–40
–60
–80
–100
–120
0
SPECTRAL PERFORMANCE
fIN = 12.5MHz
VS = +5V
REFT = +3.25V
REFB = +2.25V
3 6 9 12
Frequency (MHz)
15
0
–20
–40
–60
–80
–100
–120
0
UNDERSAMPLING PERFORMANCE
fIN = 20MHz
fS = 16MHz
1.6 3.2 4.8 6.4
Frequency (MHz)
8.0
0
–20
–40
–60
–80
–100
0
TWO-TONE INTERMODULATION
f1 = 3.6MHz at –7dB
f2 = 3.5MHz at –7dB
2f1 – f2 55.7dBFS
2f2 – f1 54.6dBFS
2468
Frequency (MHz)
10
®
5 ADS931
5 Page 
+3V
10µF
0.1µF
0.1µF
VIN
IN
+1.5V
2kΩ
0.1µF
ADS931
CM
+VS
+VS RT RB REFT REFB
3V 4kΩ 4kΩ 2V 1V
5V 12kΩ 12kΩ 2V 1V
5V 8kΩ 8kΩ 3V 2V
5V 3kΩ 3kΩ 3.5V 1.5V
RT
4kΩ
REFT
1kΩ
LpBy
1kΩ
0.1µF
0.1µF
1kΩ
LnBy
1kΩ
REFB
0.1µF
0.1µF
RB
4kΩ
FIGURE 6. Low-cost Solution to Supply External Reference Voltages.
+VS
10kΩ
REF1004
+1.2V
5kΩ
3kΩ
+VS
1/2 A1
RF1
RG1
10Ω
Top
Reference
1/2 A1
10Ω
Bottom
Reference
RF2
RG2
FIGURE 7. High Accuracy Solution to Supply External Reference Voltages.
reference voltage is established by a two terminal bandgap
reference diode, the REF1004-1.2. Using a general-purpose
single-supply dual operational amplifier (A1), like an
OPA2237, OPA2234 or MC34072, the two required refer-
ence voltages for the ADS931 can be generated by setting
each op amp to the appropriate gain; for example: set REFT
to +2V and REFB to +1V.
CLOCK INPUT
The clock input of the ADS931 is designed to accommodate
either +3V or +5V CMOS logic levels. To drive the clock
input with a minimum amount of duty cycle variation and
support the maximum sampling rate (30MSPS), high speed
or advanced CMOS logic should be used (HC/HCT,
AC/ACT). When digitizing at high sampling rates, a 50%
®
11 ADS931
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet ADS931.PDF ] | |
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