ADS5294 Datasheet, PDF (57/67 Pages) Texas Instruments – Octal Channel 14-Bit, 80 MSPS High-SNR and Low-Power ADC

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ADS5294
SLAS776B – NOVEMBER 2011 – REVISED JULY 2012
Custom Filter Coefficients
The filter coefficients can also be programmed by the user (customized). For custom coefficients, set the register
bit <FILTER COEFF SELECT> and load the coefficients (h₀ to h₁₁) in registers 0x5A to 0xB9, using the serial
interface as:
Register content = real coefficient value x 211, i.e., 12 bit signed representation of real coefficient.
Board Design Considerations
Grounding
A single ground plane is sufficient to give good performance, provided the analog, digital, and clock sections of
the board are cleanly partitioned. See ADS5294VM Evaluation Module (SLAU355) for placement of components,
routing and grounding.
Supply Decoupling
Because the ADS5294 already includes internal decoupling, minimal external decoupling can be used without
loss in performance. For example, the ADS5294EVM uses a single 0.1 µF decoupling capacitor for each supply,
placed close to the device supply pins.
Packaging
Exposed Pad
The exposed pad at the bottom of the package is the main path for heat dissipation. Therefore, the pad must be
soldered to a ground plane on the PCB for best thermal performance. The pad must be connected to the ground
plane through the optimum number of vias.
Also, visit TI’s thermal website at www.ti.com/thermal.
Copyright © 2011–2012, Texas Instruments Incorporated
Product Folder Link(s) :ADS5294
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