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ADS7890 Datasheet Preview

ADS7890 Datasheet

Analog-to-Digital Converter

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ADS7890
SLAS409 − DECEMBER 2003
14ĆBIT, 1.25ĆMSPS
LOW POWER SAR ANALOGĆTOĆDIGITAL CONVERTER
FEATURES
D 1.25 MHz Sample Rate, 14-Bit Resolution
D Zero Latency
D Unipolar, Pseudo Differential Input, Range:
− 0 V to 2.5 V
D SPIE Compatible Serial Interface
D 77.5 dB SNR and −95 dB THD at 0.5 MHz I/P
D Power Dissipation 45 mW at 1.25 MSPS
D Nap Mode (10 mW Power Dissipation)
D Power Down (10 mW)
D Internal Reference
D Internal Reference Buffer
D 48-Pin TQFP Package
APPLICATIONS
D Optical Networking (DWDM, MEMS Based
Switching)
D Spectrum Analyzers
D High Speed Data Acquisition Systems
D High Speed Close-Loop Systems
D Telecommunication
DESCRIPTION
The ADS7890 is a 14-bit 1.25-MSPS A-to-D converter with 2.5-V internal reference. The device includes a
capacitor based SAR A/D converter with inherent sample and hold. The device offers a 14-bit serial SPI or DSP
compatible interface. The device has a pseudo-differential input stage.
The −IN swing of ±200 mV is useful to compensate for ground voltage mismatch between the ADC and sensor
and also to cancel common-mode noise. The device operates at lower power when used at lower conversion
rates because of the nap feature. The device is available in a 48-pin TQFP package.
+IN
+
−IN
_
REFIN
REFOUT
SAR
CDAC
Comparator
Output
Latches
and
3-State
Drivers
CLOCK
2.5 V
Internal
Reference
Conversion
and
Control Logic
PWD/RST
SDO
SCLK
BUSY
CS
FS
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.
SPI is a trademark of Motorola, Inc.
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.
Copyright 2003, Texas Instruments Incorporated




Burr-Brown

ADS7890 Datasheet Preview

ADS7890 Datasheet

Analog-to-Digital Converter

No Preview Available !

ADS7890
SLAS409 − DECEMBER 2003
www.ti.com
This integrated circuit can be damaged by ESD. Texas Instruments 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.
ORDERING INFORMATION
MODEL
MAXIMUM
INTEGRAL
LINEARITY
(LSB)
MAXIMUM
DIFFERENTIAL
LINEARITY
(LSB)
NO MISSING
CODES AT
RESOLUTION
(BIT)
PACKAGE
TYPE
PACKAGE
DESIGNATOR
TEMPERATURE
RANGE
ADS7890 ±1.5
+1.5/−1
48-Pin
14
TQFP
PFB
−40°C to 85°C
NOTE: For most current specifications and package information, refer to the TI website at www.ti.com.
ORDERING
INFORMATION
ADS7890IPFBT
ADS7890IPFBR
TRANSPORT
MEDIA QUANTITY
Tape and reel
250
Tape and reel
1000
ABSOLUTE MAXIMUM RATINGS
over operating free-air temperature range(1)
+IN to AGND
−IN to AGND
+VA to AGND
+VBD to BDGND
Digital input voltage to GND
Digital output to GND
Operating temperature range
Storage temperature range
Junction temperature (TJmax)
TQFP package
Lead temperature, soldering
Power dissipation
θJA Thermal impedance
Vapor phase (60 sec)
Infrared (15 sec)
UNIT
−0.3 V to +VA + 0.1 V
−0.3 V to 0.5 V
−0.3 V to 7 V
−0.3 V to 7 V
−0.3 V to (+VBD + 0.3 V)
−0.3 V to (+VBD + 0.3 V)
−40°C to 85°C
−65°C to 150°C
150°C
(TJ Max–TA)/ θJA
86°C/W
215°C
220°C
(1) Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress ratings only, and
functional operation of the device at these or any other conditions beyond those indicated under “recommended operating conditions” is not
implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
2



Part Number ADS7890
Description Analog-to-Digital Converter
Maker Burr-Brown
Total Page 3 Pages
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ADS7890 Datasheet PDF





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