AFE8405 datasheet(32/152 Pages) TI

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7.1.2

Receive Input Power Meters

B0107-01

Fromrxin_aFIFOOutput

Fromrxin_cFIFOOutput

Fromrxin_bFIFOOutput

Fromrxin_dFIFOOutput

pmeter_iq0

pmeter_iq2

pmeter_iq1

pmeter_iq3

PowerMeter0Results

PowerMeter2Results

PowerMeter1Results

PowerMeter3Results

PowerMeter0

PowerMeter2

PowerMeter1

PowerMeter3

AFE8405

14-BIT, 85-MSPS, SINGLE-ADC, 8-CHANNEL WIDEBAND RECEIVER

SLWS212 – OCTOBER 2008

www.ti.com

PROGRAMMING

VARIABLE

DESCRIPTION

adc_fifo_bypass

When set, bypasses the input FIFOs and input data is latched directly using the rxclk. When cleared, input data is

latched using the adcclk_a/b/c/d inputs.

ssel_adc_fifo(2:0)

Selects the sync source for the FIFO state machines. This sync signal initializes the FIFO input and output

pointers.

rate_sel(1:0)

This selects the FIFO input and output rate; {rxclk, rxclk/2, rxclk/4 or rxclk/8}. For example, with rxclk at 153.6

MHz, set rate_sel to 0, 1, 2, or 3, respectively, for adcclk_a/b/c/d 153.6, 76.8, 38.4, or 19.2 MHz. Must be set the

same as DDCCONFIG1 register ch_rate_sel(1:0).

adc_fifo_strap_ab

When set, the rxin_a and rxin_b FIFO input and output pointers are synchronized to support complex input

signals. (Note: rxin_b is not used.)

adc_fifo_strap_cd

When set, the rxin_c and rxin_d FIFO input and output pointers are synchronized to support complex input

signals.

Figure 7-2. Receive Input Power Meters

Four receive input RMS power meters are provided by design. For real inputs, three power meters (power

meter 0/2/3) can be used to measure the RMS power of the combined carriers in each of the three input

signals from rxin_a/c/d (the Q input is held at zero). For complex inputs from rxin_c and rxin_d, one power

meter can be use to measure the combined complex power and the other can be disabled (rxin_b is not

used in the AFE8405).

RECEIVE DIGITAL SIGNAL PROCESSING

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