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| MAX1302 Datasheet, PDF (13/31 Pages) Maxim Integrated Products – 8-/4-Channel, VREF Multirange Inputs, Serial 16-Bit ADCs | |||
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8-/4-Channel, ±VREF Multirange Inputs,
Serial 16-Bit ADCs
Pin Description (continued)
PIN
NAME
MAX1300 MAX1301
FUNCTION
21
18
AGND3 Analog Signal Ground 3. AGND3 is the ADC negative reference potential. Connect AGND3 to
AGND1. DGND, DGNDO, AGND3, AGND2, and AGND1 must be connected together.
22
19
AVDD2
Analog Supply Voltage 2. Connect AVDD2 to a +4.75V to +5.25V power-supply voltage. Bypass
AVDD2 to AGND2 with a 0.1µF capacitor.
23
20
AGND2
Analog Ground 2. This ground carries approximately five times more current than AGND1.
DGND, DGNDO, AGND3, AGND2, and AGND1 must be connected together.
24
1
AGND1 Analog Ground 1. DGND, DGNDO, AGND3, AGND2, and AGND1 must be connected together.
5.0V
5.0V
5.0V
0.1µF
0.1µF
0.1µF
4â20mA
PLC
ACCELERATION
PRESSURE
TEMPERATURE
WHEATESTONE
WHEATESTONE
1µF
0.1µF
AVDD2
CHO
AVDD1
DVDD
CH1
DVDDO
CH2
CH3
CH4
CH5
MAX1302
SCLK
CH6
CS
CH7
DIN
REF
SSTRB
AGND1
DOUT
REFCAP
AGND2 AGND3 DGND DGNDO
3.3V
VDD
0.1µF MC68HCXX
µC
SCK
I/O
MOSI
I/O
MISO
VSS
Figure 1. Typical Application Circuit
Detailed Description
The MAX1302/MAX1303 multirange, low-power, 16-bit
successive-approximation ADCs operate from a single
+5V supply and have a separate digital supply allowing
digital interface with 2.7V to 5.25V systems. These 16-bit
ADCs have internal track-and-hold (T/H) circuitry that
supports single-ended and fully differential inputs. For
single-ended conversions, the valid analog input voltage
range spans from -VREF below ground to +VREF above
ground. The maximum allowable differential input voltage
spans from -2 x VREF to +2 x VREF. Data can be convert-
ed in a variety of software-programmable channel and
data-acquisition configurations. Microprocessor (µP) con-
trol is made easy through an SPI-/QSPI-/MICROWIRE-
compatible serial interface.
The MAX1302 has eight single-ended analog input
channels or four differential channels (see the Block
Diagram at the end of the data sheet). The MAX1303 has
four single-ended analog input channels or two differential
channels. Each analog input channel is independently
software programmable for seven single-ended input
ranges (0 to +VREF/2, -VREF/2 to 0, 0 to +VREF, -VREF to 0,
±VREF/4, ±VREF/2, and ±VREF) and three differential input
ranges (±VREF/2, ±VREF, and ±2 x VREF). Additionally, all
analog input channels are fault tolerant to ±6V. A fault
condition on an idle channel does not affect the conver-
sion result of other channels.
______________________________________________________________________________________ 13
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