MAX1034_12 Datasheet, PDF (13/31 Pages) Maxim Integrated Products – 8-/4-Channel, ±VREF Multirange Inputs,Serial 14-Bit ADCs

8-/4-Channel, ±V_REF Multirange Inputs,
Serial 14-Bit ADCs
Pin Description (continued)
PIN
MAX1034 MAX1035
21
18
22
19
23
20
24
1
NAME
AGND3
AVDD2
AGND2
AGND1
FUNCTION
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.
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.
Analog Ground 2. This ground carries approximately five times more current than AGND1.
DGND, DGNDO, AGND3, AGND2, and AGND1 must be connected together.
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
4–20mA
PLC
ACCELERATION
PRESSURE
TEMPERATURE
WHEATESTONE
WHEATESTONE
1µF
0.1µF
AVDD2
AVDD1
DVDD
CHO
CH1
DVDDO
CH2
CH3
CH4
CH5
MAX1034
SCLK
CH6
CS
CH7
DIN
REF
SSTRB
AGND1
DOUT
REFCAP
AGND2 AGND3 DGND DGNDO
3.3V
V_DD
0.1µF _MC68HCXX
µC
SCK
I/O
MOSI
I/O
MISO
V_SS
Figure 1. Typical Application Circuit
Detailed Description
The MAX1034/MAX1035 multirange, low-power, 14-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 14-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 -V_REF below ground to +V_REF above
ground. The maximum allowable differential input volt-
age spans from -2 x V_REF to +2 x V_REF. Data can be
converted in a variety of software-programmable chan-
nel and data-acquisition configurations. Microprocessor
(µP) control is made easy through an SPI-/QSPI-/
MICROWIRE-compatible serial interface.
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