MAX1407 Datasheet, PDF (15/48 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
MAX1407
MAX1414
MAX1408
MAX1409
20
20
14
21
21
15
22
22
16
23
23
17
24
24
18
25
25
19
26
26
20
27
27
—
28
—
—
—
28
—
PIN
INT
DOUT
DIN
SCLK
CS
DGND
DV_DD
IN3
OUT2
IN5
Pin Description (continued)
FUNCTION
Active-Low Interrupt Output. INT goes low when the PLL output is ready,
when the signal-detect comparator is tripped, or when the alarm is triggered.
Serial Data Output. DOUT outputs serial data from the internal shift register
on SCLK’s falling edge. When CS is high, DOUT is three-stated.
Serial Data Input. Data on DIN is written to the input shift register and is
clocked in at SCLK’s rising edge when CS is low.
Serial Clock Input. Apply an external serial clock to transfer data to and from
the device. This serial clock can be continuous, with data transmitted in a
train of pulses, or intermittent while CS is low.
Active-Low Chip-Select Input. CS is used to select the active device in
systems with more than one device on the serial bus. Data will not be
clocked into DIN unless CS is low. When CS is high, DOUT is three-stated.
Digital Ground. Reference point for digital circuitry.
Digital Supply Voltage
Analog Input. Analog input to both the positive and negative mux.
Force/Sense DAC2 Output
Analog Input. Analog input to the positive mux only.
Detailed Information
The MAX1407/MAX1408/MAX1409/MAX1414 are low-
power, general-purpose, multichannel DAS featuring a
multiplexed fully differential 16-bit ∑∆ analog-to-digital
converter (ADC), 10-bit force/sense digital-to-analog
converters (DAC), a real-time clock (RTC) with an
alarm, a bandgap voltage reference, a signal detect
comparator, two power-supply voltage monitors, wake-
up control circuitry, and a high-frequency phase-locked
loop (PLL) clock output all controlled by a 3-wire serial
interface. (See Table 1 for the MAX1407/MAX1408/
MAX1409/MAX1414 feature sets and Figures 1, 2, 3 for
the Functional Diagrams). These DAS directly interface
to various sensor outputs and once configured provide
the stimulus, conditioning, and data conversion, as well
as microprocessor support. Figure 4 is a Typical
Application Circuit for the MAX1407/MAX1414.
The 16-bit ∑∆ ADC is capable of programmable contin-
uous conversion rates of 30Hz or 60Hz and gains of
1/3, 1, and 2V/V to suit applications with different power
and dynamic range constraints. The force/sense DACs
provide 10-bit linearity for precise sensor applications.
Table 1. MAX1407/MAX1408/MAX1409/MAX1414 Feature Sets
PART
MAX1407
MAX1414
MAX1408
MAX1409
ADC
AUXILIARY
ANALOG
INPUTS
FORCE/
SENSE
DAC
4
2
4
2
8
0
1
1
THREE-
STATE
DIGITAL
OUTPUT
Yes
Yes
Yes
No
COMPARATOR
THRESHOLD
(mV)
0
50
0
0
RTC
Yes
Yes
Yes
Yes
ADC DATA
READY
(DRDY)
Yes
Yes
Yes
No
EXTERNAL
POWER-
SUPPLY
SHUTDOWN
CONTROL
Yes
Yes
Yes
No
ADC
DIFFERENTIAL
INPUT MUX
8
8
8
4
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