ADS5294_15 Datasheet, PDF (1/81 Pages) Texas Instruments – Octal-Channel 14-Bit 80-MSPS High-SNR and Low-Power ADC

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ADS5294
SLAS776D – NOVEMBER 2011 – REVISED SEPTEMBER 2015
ADS5294 Octal-Channel 14-Bit 80-MSPS High-SNR and Low-Power ADC
1 Features
•1 Maximum Sample Rate: 80 MSPS/14-Bit
• High Signal-to-Noise Ratio
– 75.5-dBFS SNR at 5 MHz / 80 MSPS
– 78.2-dBFS SNR at 5 MHz / 80 MSPS and
Decimation Filter Enabled
– 84-dBc SFDR at 5 MHz / 80 MSPS
• Low Power Consumption
– 58 mW/CH at 50 MSPS
– 77 mW/CH at 80 MSPS (2-LVDS Wire Per
Channel)
• Digital Processing Block
– Programmable FIR Decimation Filter and
Oversampling to Minimize Harmonic
Interference
– Programmable IIR High-Pass Filter to Minimize
DC Offset
– Programmable Digital Gain: 0 dB to 12 dB
– 2-Channel or 4-Channel Averaging
• Flexible Serialized LVDS Outputs:
– One or Two Wires of LVDS Output Lines Per
Channel Depending on ADC Sampling Rate
– Programmable Mapping Between ADC Input
Channels and LVDS Output Pins-Eases Board
Design
– Variety of Test Patterns to Verify Data Capture
by FPGA/Receiver
• Internal and External References
• 1.8-V Operation for Low Power Consumption
• Low-Frequency Noise Suppression
• Recovery From 6-dB Overload Within 1 Clock
Cycle
• Package: 12-mm × 12-mm 80-Pin QFP
3 Description
The ADS5294 is a low-power 80-MSPS 8-Channel
ADC that uses CMOS process technology and
innovative circuit techniques. Low power
consumption, high SNR, low SFDR, and consistent
overload recovery allow users to design high-
performance systems.
The digital processing block of the ADS5294
integrates several commonly used digital functions for
improving system performance. The device includes
a digital filter module that has built-in decimation
filters (with lowpass, highpass and bandpass
characteristics). The decimation rate is also
programmable (by 2, by 4, or by 8). This rate is useful
for narrow-band applications, where the filters are
used to conveniently improve SNR and knock-off
harmonics, while at the same time reducing the
output data rate. The device includes an averaging
mode where two channels (or even four channels)
are averaged to improve SNR.
Device Information⁽¹⁾
PART NUMBER
PACKAGE
BODY SIZE (NOM)
ADS5294
HTQFP (80)
12.00 mm × 12.00 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
Simplified Block Diagram
INxP
INxN
SAMPLING
CIRCUIT
CLKP
CLKN
SYNC
1 of 8 Channels
14 BITA1A4DDAbCiCt
DIGITAL PROCESSING
BLOCK
SERIALIZER
CLOCKGEN
PLL
OUTxA_P
OUTxA_N
OUTxB_P
OUTxB_N
LCLKP
LCLKN
ACLKP
ACLKN
REFERENCE
CONTROL
INTERFACE
ADS5294
2 Applications
• Ultrasound and Sonar Imaging
• Communication Applications
• Multi-channel Data Acquisition
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.