Datasheet
MAX19707
10-Bit, 45Msps, Ultra-Low-Power
Analog Front-End
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In ENABLE-16 mode, the aux-DACs have independent
control bits E4, E5, and E6, and bit E9 enables the aux-
ADC. Table 7 shows the auxiliary DAC enable codes
and Table 8 shows the auxiliary ADC enable codes. Bits
E11 and E10 are reserved. Program bits E11 and E10 to
logic-low.
Modes aux-DAC1, aux-DAC2, and aux-DAC3 select
the aux-DAC channels named DAC1, DAC2, and
DAC3 and hold the data inputs for each DAC. Bits
_D11–_D0 are the data inputs for each aux-DAC and
can be programmed through SPI. The MAX19707 also
includes two 6-bit registers that can be programmed to
adjust the offsets for the Tx DAC I and Q channels
independently (see Table 9). Use the COMSEL mode
to select the output common-mode voltage with bits
CM1 and CM0 (see Table 10). Use Aux-ADC mode to
start the auxiliary ADC conversion (see the 10-Bit,
333ksps Auxiliary ADC section for details). Use
ENABLE-8 mode for faster enable and switching
between shutdown, idle, and standby states as well as
switching between FAST, SLOW, and Rx and Tx modes.
Table 6. Tx-Rx Control Using SPI Commands
ADDRESS DATA BITS T/R
A3
A2 A1 A0 E3 E2 E1 E0 PIN 27
MODE
FUNCTION
(Tx-Rx SWITCHING
SPEED)
DESCRIPTION COMMENTS
1011 X
SPI1-Rx
SLOW
Rx Mode:
Rx ADC = ON
Tx DAC = OFF
Rx Bus = Enable
Low Power:
Slow Rx to Tx through
SPI command.
1100 X
SPI2-Tx
SLOW
Tx Mode:
Rx ADC = OFF
Tx DAC = ON
Tx Bus = Enable
Low Power:
Slow Tx to Rx through
SPI command.
1101 X
SPI3-Rx
FAST
Rx Mode:
Rx ADC = ON
Tx DAC = ON
Rx Bus = Enabled
Moderate Power:
Fast Rx to Tx through
SPI command.
0000
(16-Bit Mode)
or
1000
(8-Bit Mode)
1110 X
SPI4-Tx
FAST
Tx Mode:
Rx ADC = ON
Tx DAC = ON
Tx Bus = Enabled
Moderate Power:
Fast Tx to Rx through
SPI command.
Table 7. Aux-DAC Enable Table
(ENABLE-16 Mode)
E6
E5
E4
AUX-DAC3
AUX-DAC2
AUX-DAC1
000
ON ON ON
001
ON ON OFF
010
ON OFF ON
011
ON OFF OFF
100
OFF ON ON
101
OFF ON OFF
110
OFF OFF ON
111
OFF OFF OFF
Table 8. Aux-ADC Enable Table
(ENABLE-16 Mode)
E9 SELECTION
0 (Default) Aux-ADC is Powered ON
1 Aux-ADC is Powered OFF
X = Don’t care.