MAX1407 Datasheet, PDF (18/48 Pages) Maxim Integrated Products – Low-Power, 16-Bit Multichannel DAS with Internal Reference,10-Bit DACs, and RTC

Low-Power, 16-Bit Multichannel DAS with
Internal Reference,10-Bit DACs, and RTC
LX
OUT
RST
LX
MAX1833
V_DD = 3.3V OR V_BAT
10µF
18nF
0.1µF
0.1µF
BATT
SHDN
GND
CPLL
SHDN
AV_DD
IN0
DV_DD
RESET
CLKIN
V_DD
RESET
µP/µC
REF
V_BAT
10µF
4.7µF
R_L
IN1
CLKOUT
FOUT
32.768kHz
CLKIN
R_T
R_F
WE
SENSOR RE
CE
OUT1
FB1
FB2
MAX1407
MAX1414
CS
SCLK
DIN
DOUT
INT
DRDY
WU1
WU2
OUTPUT
SCK
MOSI
MISO
INPUT
INPUT
I/O
I/O
OUT2
AGND
DGND
V_SS
0.1µF
Figure 4. MAX1407/MAX1414 Typical Application Circuit
R_EXT
C_EXT
R_MUX
C_PIN
R_IN
C_ST
C_AMP
C_SAMPLE
C_C
Figure 5. Analog Input—Buffered Mode
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.
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