MAX1149 Maxim Integrated Products, MAX1149 Datasheet - Page 20

• Manufacturer Part Number: MAX1149
• Description: (MAX1146 - MAX1149) 14-Bit ADCs
• Manufacturer: Maxim Integrated Products

Multichannel, True-Differential,
Serial, 14-Bit ADCs
Figure 14. Unipolar Transfer Function
edge and is clocked into the µP on SCLK’s rising edge.
The first 8-bit data stream contains the first 8-bits of
DOUT starting with the MSB. The second 8-bit data
stream contains the remaining 6 result bits.
Using the high-speed QSPI interface (Figure 17) with
CPOL = 0 and CPHA = 0, the MAX1146–MAX1149 sup-
port a maximum f
necessary to obtain the entire 14-bit result from the
ADC. DOUT data transitions on the serial clock’s falling
edge and is clocked into the µP on SCLK’s rising edge.
The first 14 bits are the data.
The MAX1146–MAX1149 are compatible with a
PIC16/PIC17 microcontroller (µC), using the synchro-
nous serial-port (SSP) module. To establish SPI com-
Figure 16a. SPI Connections
20
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1...111
1...110
1...101
1...100
0...011
0...010
0...001
0...000
______________________________________________________________________________________
0
SPI
1
2
MISO
SCK
I/O
SS
3
SCLK
PIC16/PIC17 SSP Module Interface
V
INPUT VOLTAGE (LSB)
DD
of 2.1MHz. One 16-bit reading is
V
REF
CS
SCLK
DOUT
MAX1146–
MAX1149
16381
1 LSB =
QSPI Interface
16383
16384
V
REF
munication, connect the controller as shown in Figure
18 and configure the PIC16/PIC17 as system master.
Initialize the synchronous serial-port control register
(SSPCON) and synchronous serial-port status register
(SSPSTAT) to the bit patterns shown in Tables 8 and 9.
In SPI mode, the PIC16/PIC17 µCs allow 8 bits of data
to be synchronously transmitted and received simulta-
neously. Two consecutive 8-bit readings are necessary
to obtain the entire 14-bit result from the ADC. DOUT
data transitions on the serial clock’s falling edge and is
clocked into the µC on SCLK’s rising edge. The first 8-
bit data stream contains the first 8 data bits starting
with the MSB. The second data stream contains the
remaining bits, D5 through D0.
Figure 15. Bipolar Transfer Function
Figure 16b. MICROWIRE Connections
1...111
1...110
1...101
1...100
0...001
0...000
0...111
0...011
0...010
0...001
0...000
MICROWIRE
0
1
2
I/O
SK
3
SI
INPUT VOLTAGE (LSB)
8191
V
8192
REF
8193
CS
SCLK
DOUT
MAX1146–
MAX1149
16381
1 LSB =
16383
16384
V
REF