ADS61B49_09 Datasheet, PDF (1/62 Pages) Texas Instruments – 14-/12-Bit, 250-MSPS ADCs With Integrated Analog Buffer

ADS61B29
ADS61B49
www.ti.com ...................................................................................................................................................... SLWS214B – OCTOBER 2008 – REVISED MAY 2009
14-/12-Bit, 250-MSPS ADCs With Integrated Analog Buffer
FEATURES
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• Integrated High Impedance Analog Input
Buffer
• Maximum Sample Rate: 250 MSPS
• 14-Bit Resolution – ADS61B49
• 12-Bit Resolution – ADS61B29
• 790 mW Total Power Dissipation at 250 MSPS
• Double Data Rate (DDR) LVDS and Parallel
CMOS Output Options
• Programmable Fine Gain up to 6 dB for
SNR/SFDR Trade-Off and 1-V_pp Full-Scale
Operation
• DC Offset Correction
• Supports Input Clock Amplitude Down to 400
mV_PP Differential
• 48-QFN Package (7mm × 7mm)
• Pin Compatible with ADS6149 Family
APPLICATIONS
• Multicarrier, Wide Bandwidth Communications
• Wireless Multi-Carrier Communications
Infrastructure
• Software Defined Radio
• Power Amplifier Linearization Feedback ADC
• 802.16d/e
• Test and Measurement Instrumentation
• High Definition Video
• Medical Imaging
• Radar Systems
DESCRIPTION
The ADS61B49 (ADS61B29) is a 14-bit (12-bit) A/D
converter with a sampling rate up to 250 MSPS. It
combines high dynamic performance and low power
consumption in a compact 48-QFN package. An
integrated analog buffer makes it well-suited for
multi-carrier, wide bandwidth communications
applications. The buffer maintains constant
performance and input impedance across a wide
frequency range.
The ADS61B49 (ADS61B29) has fine gain options
that can be used to improve SFDR performance at
lower full-scale input ranges. It includes a dc offset
correction loop that can be used to cancel the ADC
offset. Both Double Data Rate (DDR) LVDS and
parallel CMOS digital output interfaces are available.
At lower sampling rates, the ADC automatically
operates at scaled down power with no loss in
performance.
It includes internal references while the traditional
reference pins and associated decoupling capacitors
have been eliminated. The device is specified over
the industrial temperature range (–40°C to 85°C).
ANALOG
BUFFER
ADS614X
14-Bit Family
NO
YES
ADS612X
12-Bit Family
NO
YES
250 MSPS
ADS6149
ADS61B49
ADS6129
ADS61B29
210 MSPS
ADS6148
ADS6128
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Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
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