AFE5801 Datasheet, PDF (1/46 Pages) Texas Instruments – 8-Channel Variable-Gain Amplifier (VGA) With Octal High-Speed ADC

AFE5801
www.ti.com
SLOS591D – SEPTEMBER 2008 – REVISED MAY 2010
8-Channel Variable-Gain Amplifier (VGA) With Octal High-Speed ADC
Check for Samples: AFE5801
FEATURES
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• Eight Variable-Gain Amplifiers (VGA)
– Eight Differential Buffered Inputs With 2Vpp
Maximum Swing
– 5.5nV/√Hz VCA Input Noise (31dB Gain)
– Variable Gain, –5dB to 31dB With 0.125dB
or 1dB Steps
– Digital Gain Control
• Third-Order Antialiasing Filter With
Programmable Cutoff Frequency (7.5, 10, or
14MHz)
• Clamping
• Analog-to-Digital Converter (ADC)
– Octal Channel, 12Bit, 65MSPS
– Internal and External Reference Support
– No External Decoupling Required for
References
– Serial LVDS Outputs
• 1.8V and 3.3V Supplies
• 50mW Total Power per Channel at 30MSPS
• 58mW Total Power per Channel at 50MSPS
• 64QFN Package (9mm × 9mm)
APPLICATIONS
• Imaging: Ultrasound, PET
RELATED DEVICES
• AFE5851: 16-Channel VGA + ADC,
32.5MSPS/Channel
DESCRIPTION
The AFE5801 is an analog front end, targeting
applications where the power and level of integration
are critical. The device contains eight variable-gain
amplifiers (VGA), each followed by a high-speed (up
to 65MSPS) ADC, for a total of eight ADCs per
device.
Each of the eight differential inputs is buffered,
accepts up to 2Vpp maximum input swing, and is
followed by a VGA with a gain range from –5dB to
31dB. The VGA gain is digitally controlled, and the
gain curves versus time can be stored in memory
integrated within the device using the serial interface.
A selectable clamping and antialias low-pass filter
(with 3dB attenuation at 7.5, 10, or 14MHz) is also
integrated between VGA and ADC, for every channel.
The VGA/antialias filter outputs are differential
(limited to 2Vpp) and drive the onboard 12bit,
65MSPS ADC. The ADC also scales down its power
consumption should a lower sampling rate be
selected. The ADC outputs are serialized in LVDS
streams, which further minimizes power and board
area.
The AFE5801 is available in a 64-pin QFN package
(9mm × 9mm) and is specified over the full industrial
temperature range (–40°C to 85°C).
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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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