MAX1272CUA+ Maxim Integrated, MAX1272CUA+ Datasheet - Page 15

• Manufacturer Part Number: MAX1272CUA+
• Description: Analog to Digital Converters - ADC FAULT-PROTECTED 12-BIT ADC
• Manufacturer: Maxim Integrated

Specifications of MAX1272CUA+

• Rohs: yes
• Number Of Channels: 1
• Architecture: SAR
• Conversion Rate: 87 KSPs
• Resolution: 12 bit
• Input Type: Single-Ended
• Snr: Yes
• Interface Type: QSPI, Serial (SPI, Microwire)
• Operating Supply Voltage: 4.75 V to 5.25 V
• Maximum Operating Temperature: + 70 C
• Package / Case: uMAX
• Maximum Power Dissipation: 727 mW
• Minimum Operating Temperature: 0 C
• Number Of Converters: 1
• Voltage Reference: Internal, External

Using the high-speed QSPI interface with CPOL = 0
and CPHA = 0, the MAX1272/MAX1273 support a max-
imum f
MAX1273 connected to a QSPI master.
The MAX1272/MAX1273 are compatible with a
PIC16/PIC17 controller (μC) using the synchronous ser-
ial-port (SSP) module.
To establish SPI communication, connect the controller
as shown in Figure 12 and configure the PIC16/PIC17
as system master by initializing its synchronous serial-
port control register (SSPCON) and synchronous serial-
port status register (SSPSTAT) to the bit patterns shown
in Tables 5 and 6.
In SPI mode, the PIC16/PIC17 μCs allow 8 bits of data
to be transmitted and received simultaneously. Three
consecutive 8-bit readings are necessary to obtain the
entire 12-bit result from the ADC. DOUT data transitions
on the serial clock’s falling edge and is clocked into the
Figure 10a. SPI Connections
SCLK
QSPI
SPI
of 1.4MHz. Figure 11 shows the MAX1272/
MISO
MISO
SCK
SCK
I/O
CS
SS
SS
Figure 11. QSPI Connections
______________________________________________________________________________________
PIC16 with SSP Module and
with Software-Selectable Input Range
V
V
DD
DD
PIC17 Interface
CS
SCLK
DOUT
CS
SCLK
DOUT
QSPI Interface
MAX1272
MAX1273
MAX1272
MAX1273
Fault-Protected, 12-Bit ADCs
μC on SCLK’s rising edge. The first 8-bit data stream
contains all zeros. The second 8-bit data stream con-
tains a leading zero followed by the MSB through D5.
The third 8-bit data stream contains bits D4–D0 fol-
lowed by trailing zeros.
Output data coding for the MAX1272/MAX1273 is bina-
ry in unipolar mode with:
and two’s complement binary in bipolar mode with:
Code transitions occur halfway between successive
integer LSB values. Figures 13a and 13b show the
input/output transfer functions for uni-polar and bipolar
operations, respectively. For full-scale (FS) values, see
Tables 2 and 3.
Figure 12. SPI Interface Connection for a PIC16/PIC17
Figure 10b. MICROWIRE Connections
MICROWIRE
MAX1272
MAX1273
V
DD
GND
DOUT
SCLK
SCK
I/O
1
CS
SI
1
LSB
LSB
=
=
2
4096
4096
×
FS
|
FS
Transfer Function
|
SCK
SDI
I/O
CS
SCLK
DOUT
PIC16/PIC17
MAX1272
MAX1273
V
DD
15