Datasheet

MAX1407/MAX1408/MAX1409/MAX1414
Low-Power, 16-Bit Multichannel DAS with
Internal Reference,10-Bit DACs, and RTC
18 ______________________________________________________________________________________
Buffered Mode
When used in buffered mode, the buffers isolate the
inputs from the sampling capacitors. The sampling-
related gain error is dramatically reduced since only a
small dynamic load is present from the chopper. The
multiplexer exhibits an input leakage current of 0.5nA
(typ). With high-source resistances, this leakage cur-
rent may result in a large DC offset error.
Figure 4. MAX1407/MAX1414 Typical Application Circuit
MAX1407
MAX1414
MAX1833
LX
R
L
R
F
R
T
LX
IN0
REF
IN1
10µF
10µF
V
DD
= 3.3V OR V
BAT
0.1µF 0.1µF
18nF
4.7µF
FB1
FB2
OUT2
OUT1
RESET
CLKIN
CLKOUT
FOUT
CS
SCLK
DIN
DOUT
INT
DRDY
RESET
CLKIN
0.1µF
OUTPUT
SCK
MOSI
MISO
INPUT
INPUT
µP/µC
WU2 I/O
V
BAT
BATT
OUT
RST
SHDN
SENSOR
WE
CE
RE
GND
CPLL
AGND DGND
AV
DD
DV
DD
V
DD
V
SS
SHDN
32.768kHz
WU1 I/O
Figure 5. Analog Input—Buffered Mode
R
EXT
C
EXT
R
MUX
C
PIN
R
IN
C
ST
C
AMP
C
SAMPLE
C
C