Rainbow Electronics MAX1230 - Manual (Page 9)

MAX1226/MAX1228/MAX1230
12-Bit 300ksps ADCs with FIFO,
Temp Sensor, Internal Reference
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Detailed Description
The MAX1226/MAX1228/MAX1230 are low-power, seri-
al-output, multichannel ADCs with temperature-sensing
capability for temperature-control, process-control, and
monitoring applications. These 12-bit ADCs have inter-
nal track and hold (T/H) circuitry that supports single-
ended and fully differential inputs. Data is converted
from an internal temperature sensor or analog voltage
sources in a variety of channel and data-acquisition
configurations. Microprocessor (µP) control is made
easy through a 3-wire SPI/QSPI/MICROWIRE-compati-
ble serial interface.
Figure 2 shows a simplified functional diagram of the
MAX1226/MAX1228/MAX1230 internal architecture.
The MAX1226 has eight single-ended analog input
channels or four differential channels. The MAX1228
has 12 single-ended analog input channels or six differ-
ential channels. The MAX1230 has 16 single-ended
analog input channels or eight differential channels.
12-BIT
SAR
ADC
CONTROL
SERIAL INTERFACE
OSCILLATOR
FIFO AND
ACCUMULATOR
T/H
TEMP
SENSE
REF-
CNVST
SCLK
CS
DIN
EOC
DOUT
AIN15
AIN1
AIN2
INTERNAL
REFERENCE
REF+
MAX1226
MAX1228
MAX1230
Figure 2. Functional Diagram
SCLK
DIN
DOUT
CS
t DH
t DOE
t DS
t CH t CSS t CP t CSH
t CSH
t CSS
t DOD
t DOT
Figure 1. Detailed Serial-Interface Timing Diagram