Rainbow-electronics MAX1329 Manual de usuario descargar pdf (Pagina 46)

MAX1329/MAX1330

12-/16-Bit DASs with ADC, DACs, DPIOs, APIOs,

Reference, Voltage Monitors, and Temp Sensor

46 ______________________________________________________________________________________

MSB

NAME DITH ACCC2 ACCC1 ACCC0 ACCDATA19 ACCDATA18 ACCDATA17 ACCDATA16

DEFAULT 00000000

NAME ACCDATA15 ACCDATA14 ACCDATA13 ACCDATA12 ACCDATA11 ACCDATA10 ACCDATA9 ACCDATA8

DEFAULT 00000000

LSB

NAME ACCDATA7 ACCDATA6 ACCDATA5 ACCDATA4 ACCDATA3 ACCDATA2 ACCDATA1 ACCDATA0

DEFAULT 00000000

Read Format

ADC Accumulator Register

The ADC Accumulator register contains the bits to

enable dither, set the accumulator count, and set the

20-bit accumulator data. The dither and accumulator

count bits are read/write and the accumulator data is

read only. A write to the register resets the accumulator

data (ACCDATA<19:0>) to 0x00000 and starts new

accumulation. The ACCDATA<19:0> bits remain

unchanged until the programmed count of conver-

sions is completed. The accumulator is functional for

the normal, fast power-down, and burst modes.

DITH: Dither bit (default = 0). When DITH = 0, the dither

generator is disabled and the accumulator can be used

for oversampling and providing digital filtering (see the

Applying a Digital Filter to ADC Data Using the 20-Bit

Accumulator

section). When DITH = 1, the dithering for

the ADC is enabled. Use dithering with the accumulator

to oversample data and decimate the result to extend the

effective resolution to a maximum of 16 bits and provide

digital filtering.

ACCC<2:0> ADC Accumulator Count bits (default =

000). The ACCC<2:0> bits set the number of ADC data

conversion results to be accumulated and then written to

the ACCDATA register before the ACF Status bit is set

(see Table 12). The ACF status bit is set in the Status

ter. If the accumulator count is set to 1, the accumulator

does not accumulate and the ACCDATA<11:0> is the

same as ADCDATA<11:0> in the ADC Data register.

ACCDATA<19:0>: ADC Accumulator Data bits (default =

0x00000). The ACCDATA<19:0> bits are the summation

of up to 256 ADC conversion results. When the count set

by ACCC<2:0> has been reached, the ACF status bit is

set and the accumulated data is written to this register.

The data is written to the register at a rate of the ADC

conversion rate divided by the accumulator count. The

accumulator does not exceed 0xFFFFF.

MSB LSB

NAME DITH ACCC2 ACCC1 ACCC0 XXXX

DEFAULT 0000XXXX

X = Don’t care.

Write Format

Table 12. ADC Accumulator-Count Bit

Configuration

ACCC2 ACCC1 ACCC0 ACCUMULATOR COUNT

000 1

001 4

010 8

011 16

100 32

101 64

110 128

111 256

1 2 ... 41 42 43 44 45 46 47 48 49 50 51 ... 77 78

MAX1329/MAX1330 1

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