beautypg.com

Config_ register (0ch–0fh) – Rainbow Electronics MAX11043 User Manual

Page 21

background image

MAX11043

4-Channel, 16-Bit, Simultaneous-Sampling ADCs

with PGA, Filter, and 8-/12-Bit Dual-Stage DAC

______________________________________________________________________________________

21

BIT 15

BIT 14

BIT 13

BIT 12

BIT 11

BIT 10

BIT 9

BIT 8

X

X

X

BDAC3

BDAC2

BDAC1

BDAC0

DIFF

CONFIG_ Register (0Ch–0Fh)

This register sets the gain of each ADC channel and
selects one of the default filters or EQ function.

X<15:13>: Don’t-care bits.

BDAC3:BDAC0<12:9>: Sets the input bias voltage for
AC-coupled signals when ENBIAS_ is set to 1.

0000 = 33% of AVDD.

0001 = 35% of AVDD.

0010 = 38% of AVDD.

0011 = 40% of AVDD.

0100 = 42% of AVDD.

0101 = 44% of AVDD.

0110 = 46% of AVDD.

0111 = 48% of AVDD.

1000 = 50% of AVDD.

1001 = 52% of AVDD.

1010 = 54% of AVDD.

1011 = 56% of AVDD.

1100 = 58% of AVDD.

1101 = 60% of AVDD.

1110 = 62% of AVDD.

1111 = 65% of AVDD.

DIFF<8>: Input mode select bit.

1 = normal operation in all modes.

0 = use for a 2x input signal range in LP, gain = 1
mode. Note that THD degrades.

EQ<7>: EQ function.

1 = analog EQ enabled.

0 = analog EQ disabled (default).

MODG1:MODG0<6:5>: ADC modulator gain.

00 = 1 (default).

01 = 2.

10 = 4.

11 = 4.

PDPGA<4>: PGA power-down control.

1 = PGA powered down, gain = 1.

0 = PGA powered, PGA gain set by PGAG (default).

FILT<3>: Programmable filter select.

1 = use preprogrammed LP filter.

0 = use preprogrammed EQ filter (default).

PGAG<2>: High PGA gain setting.

1 = PGA, gain = 16.

0 = PGA, gain = 8 (default).

ENBIASP<1>: Positive input bias enable. Bias voltage
set by BDAC3:BDAC0.

1 = selfbiasing enabled.

0 = selfbiasing disabled (default).

ENBIASN<0>: Negative input bias enable. Bias volt-
age set by BDAC3:BDAC0.

1 = selfbiasing enabled.

0 = selfbiasing disabled (default).

BIT 7

BIT 6

BIT 5

BIT 4

BIT 3

BIT 2

BIT 1

BIT 0

EQ

MODG1

MODG0

PDPGA

FILT

PGAG

ENBIASP

ENBIASN