
MAX1245
+2.375V, Low-Power, 8-Channel,
Serial 12-Bit ADC
18
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20
19
18
17
16
15
14
13
12
11
1
2
3
4
5
6
7
8
9
10
MAX1245
MC683XX
CH0
CH1
CH2
CH3
CH4
CH5
CH6
CH7
COM
SHDN
V
DD
SCLK
CS
DIN
SSTRB
DOUT
DGND
AGND
V
DD
VREF
(POWER SUPPLIES)
SCK
PCS0
MOSI
MISO
CLOCK CONNECTIONS NOT SHOWN
0.1
F
4.7
F
(GND)
0.1
F
ANALOG
INPUTS
+3V
+2.5V
+2.048V
Figure 17. MAX1245 QSPI Connections
High-Speed Digital Interfacing with QSPI
The MAX1245 can interface with QSPI using the circuit in
Figure 17 (fSCLK = 1.5MHz, CPOL = 0, CPHA = 0). This
QSPI circuit can be programmed to do a conversion on
each of the eight channels. The result is stored in memory
without taxing the CPU, since QSPI incorporates its own
micro-sequencer.
Because the maximum external clock frequency is
1.5MHz, the MAX1245 is QSPI compatible up to 1.5MHz.