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AFE5851-AFE5851IRGCR-AFE5851IRGCT
16-channel VGA with ADC
AFE5851
www.ti.com SLOS574B –SEPTEMBER 2008–REVISED MAY 2010
CHANNEL VARIABLE GAIN AMPLIFIER (VGA) WITH OCTAL HIGH SPEED ADC
Checkfor Samples: AFE5851
1FEATURES
DESCRIPTION• 16 Variable Gain Amplifiers (VGA) 16 Single-Ended Buffered Inputs With 1VPP The AFE5851 is an analog front-end targeting
applications where the power and levelof integration
Maximum Swingare critical. The device contains 16 variable gain
– 5.5nV/√Hz VCA Input Noise (31dB Gain). amplifiers (VGA), followedbyan octal high speed (up
– Variable Gain –5dBto 31dB With 0.125dB to65 MSPS) analogto digital converter (ADC).
Steps Each of the 16 single ended inputsis buffered,
– Digital Gain Control accepts upto 1VPP maximum input swing anditis
• 3rd Order Anti-Aliasing Filter With followed bya VGA witha gain range from –5dBto
Programmable Cut-Off Frequency (7.5,10 and 31dB. The VGA gainis digitally controlled and the
gain curves versus time can be storedin memory,
14MHz).integrated within the device using the serial interface.
• Clamping selectable clamping and anti-alias low pass filter
• Analog-to-Digital Converter (ADC)(with 3dB attenuationat 7.5, 10or 14MHz)is also
– Octal channel 12-bit,65 MSPS integrated between the VGA and ADC for every
– 32.5 MSPS Maximum per Input Channel channel. The VGA/anti-alias filter outputs are
differential (limitedto2 VPP) and drive the on-board
– 2 VGA Outputs Alternately Sampled by12-bit 65MSPS ADC thatis shared between two
Each ADCVGAsto optimize the power dissipation. Each VGA
– Internal and External Reference Support outputis sampledat alternate clock cycles, making
– No External Decoupling Required for the effective sampling frequency half the input clock
References rate. The ADC also scales down its power
consumption should a lower sampling rate be
– Serial LVDS Outputsselected.
• 1.8V and 3.3V SupplyThe ADC outputs are serializedin LVDS streams
• 39 mW Total Power per Channelat 32.5 MSPS further minimizing power and board area. The
• 64-QFN Package (9mm× 9mm) AFE5851 is available ina 64-pin QFN package
(9x9mm2) andis specified over the full industrial
APPLICATIONS temperature range (–40°Cto 85°C).
PET MSPS/channel
