AFE5809_13 Datasheet, PDF (42/90 Pages) Texas Instruments – Fully Integrated, 8-Channel Ultrasound Analog Front End with Passive CW Mixer, and Digital I/Q Demodulator, 0.75 nV/rtHz, 14, 12-Bit, 65 MSPS, 158 mW/CH

AFE5809
SLOS738C – SEPTEMBER 2012 – REVISED JANUARY 2013
ADC.1
ADC.2
ADC.3
ADC.4
CH.A
CH.B
Sub-Chip 0
CH.C
CH.D
LVDS.1
LVDS.2
LVDS.3
LVDS.4
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ADC.5
ADC.6
ADC.7
ADC.8
CH.A
CH.B
Sub-Chip 1
CH.C
CH.D
LVDS.5
LVDS.6
LVDS.7
LVDS.8
Figure 67. Each of Two Sub-chips Supports 4 Channels. Each of Two Demodulators has 4 Channels
Named as A, B, C, D
5. Demodulator register readout follows the following procedures:
– Write '1' to register 0x0[1]; pin SPI_DIG_EN should be '0' while writing. This is the readout enable register
for demodulator.
– Write '1' to register 0x0[1], pin SPI_DIG_EN should be '1' while writing.This is the readout enable register
for ADC and VCA.
– Set SPI_DIG_EN as '0' and write anything to the register whose stored data needs to be known. Device
finds the address of the register and sends its stored data at the SDOUT pin serially.
NOTE
After enabling the register 0x0[1] REGISTER_READOUT_ENABLE, data can't be
written to the register (whose data needs to be known) but stored data would come
serially at the SDOUT pin.
– To disable the register readout, first write '0' to register 0x0[1] while SPI_DIG_EN is '1'; then write '0' to
register 0x0[1] while SPI_DIG_EN is '0'.
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