ADC32RF44 Datasheet, PDF(46/134 Page) Texas Instruments – Dual-Channel, 14-Bit, 2.6-GSPS, Analog-to-Digital Converter

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ADC32RF44 Datasheet, PDF (46/134 Pages) Texas Instruments – Dual-Channel, 14-Bit, 2.6-GSPS, Analog-to-Digital Converter

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ADC32RF44

SBAS809 â FEBRUARY 2017

www.ti.com

Table 9 shows the register configurations required to set up the crossing detector. The detector operates in the

fS / 8 clock domain. The AGC modes can be configured separately for channel A (54xxh) and channel B (5Cxxh),

although some registers are common in 54xxh (such as the GPIO pin selection).

PKDET EN

BLKPKDET

BLKTHHH, BLKTHHL,

BLKTHLH, BLKTHLL

FILT0LPSEL

TIMECONST

FIL0THH, FIL0THL,

FIL1THH, FIL1THL

DWELLIIR

IIR0 2BIT EN,

IIR1 2BIT EN

OUTSEL GPIO[4:1]

IODIR

RESET AGC

Table 9. Registers Required for the Crossing Detector Operation

ADDRESS

5400h, 5C00h

5401h, 5402h, 5403h,

5C01h, 5C02h, 5C03h

5407h, 5408h, 5409h,

540Ah, 5C07h, 5C08h,

5C09h, 5C0Ah

540Dh, 5C0Dh

540Eh, 540Fh,

5C0Eh, 5C0Fh

540Fh-5412h, 5C0Fh-

5C12h, 5416h-5419h,

5C16h-5C19h

541Dh, 541Eh, 5C1Dh,

5C1Eh

5413h, 54114h,

5C13h, 5C114h

5432h, 5433h,

5434h, 5435h

5437h

542Bh, 5C2Bh

DESCRIPTION

Enables peak detector

Sets the block length N of number of samples (S`).

Number of actual ADC samples is 8X this value: N is 17 bits: 1 to 216.

Sets the different thresholds for the hysteresis function values from 0 to 256

(where 256 is equivalent to the peak amplitude).

For example: if BLKTHHH is to â2 dBFS from peak, 10(â2 / 20) Ã 256 = 203, then

set 5407h and 5C07h = CBh.

Select block detector output or 2-bit output mode as the input to the interrupt

identification register (IIR) filter.

Sets the crossing detector time period for N = 0 to 15 as 2N Ã fS / 8 clock cycles.

The maximum time period is 32768 Ã fS / 8 clock cycles (approximately 101 Âµs at

2.6 GSPS).

Comparison thresholds for the crossing detector counter. These thresholds are 16-

bit thresholds in 2.14-signed notation. A value of 1 (4000h) corresponds to 100%

crossings, a value of 0.125 (0800h) corresponds to 12.5% crossings.

DWELL counter for the IIR filter hysteresis.

Enables 2-bit output format for the crossing detector.

Connects the IIRPKDET0, IIRPKDET1 alarms to the GPIO pins; common register.

Selects the direction for the four GPIO pins; common register.

After configuration, reset the AGC module to start operation.

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