Datasheet

Digital Interface
The MAX1300/MAX1301 feature a serial interface that
is compatible with SPI/QSPI and MICROWIRE devices.
DIN, DOUT, SCLK, CS, and SSTRB facilitate bidirectional
communication between the MAX1300/MAX1301 and
the master at SCLK rates up to 10MHz (internal clock
mode, mode 2), 3.67MHz (external clock mode, mode
0), or 4.39MHz (external acquisition mode, mode 1). The
master, typically a microcontroller, should use the CPOL =
0, CPHA = 0, SPI transfer format, as shown in the timing
diagrams of Figures 2, 3, and 4.
The digital interface is used to:
• Select single-ended or true-differential input channel
configurations
• Select the unipolar or bipolar input range
• Select the mode of operation:
External clock (mode 0)
External acquisition (mode 1)
Internal clock (mode 2)
Reset (mode 4)
Partial power-down (mode 6)
Full power-down (mode 7)
• Initiate conversions and read results
Chip Select (CS)
CS enables communication with the MAX1300/MAX1301.
When CS is low, data is clocked into the device from DIN
on the rising edge of SCLK and data is clocked out of
DOUT on the falling edge of SCLK. When CS is high,
activity on SCLK and DIN is ignored and DOUT is high
impedance allowing DOUT to be shared with other periph-
erals. SSTRB is never high impedance and therefore can-
not be shared with other peripherals.
Serial Strobe Output (SSTRB)
As shown in Figures 3 and 4, the SSTRB transitions high
to indicate that the ADC has completed a conversion
and results are ready to be read by the master. SSTRB
remains low in the external clock mode (Figure 2) and
consequently may be left unconnected. SSTRB is driven
high or low regardless of the state of CS, therefore SSTRB
cannot be shared with other peripherals.
Figure 7. Single-Ended Input Voltage Ranges Figure 8. Differential Input Voltage Ranges
001 010 011 100 101 110 111
0
(-3 x V
REF
)/2
-3 x V
REF
+3 x V
REF
(+3 x V
REF
)/2
EACH INPUT IS FAULT TOLERANT TO 16.5V.
V
REF
= 4.096V.
(CH_) - AGND1 (V)
INPUT RANGE SELECTION BITS, R[2:0]
FSR = (3 x V
REF
)/2
FSR = 6V
FSR = (3 x V
REF
)/2
FSR = 3 x V
REF
FSR = 3 x V
REF
FSR = 3 x V
REF
FSR = 6 x V
REF
001 010 011 100 101 110 111
-3 x V
REF
-6 x V
REF
+6 x V
REF
+3 x V
REF
EACH INPUT IS FAULT TOLERANT TO 16.5V.
V
REF
= 4.096V.
(CH_+) - (CH_-) (V)
INPUT RANGE SELECTION BITS, R[2:0]
0
FSR = 3 x V
REF
FSR = 6 x V
REF
FSR = 12 x V
REF
MAX1300/MAX1301 8- and 4-Channel, ±3 x V
REF
Multirange Inputs,
Serial 16-Bit ADCs
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