Datasheet

Detailed Description
The MAX1300/MAX1301 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 sup-
ports single-ended and fully differential inputs. For single-
ended conversions, the valid analog input voltage range
spans from -3 x V
REF
below ground to +3 x V
REF
above
ground. The maximum allowable differential input voltage
spans from -6 x V
REF
to +6 x V
REF
. Data can be con-
verted 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 MAX1300 has eight single-ended analog input chan-
nels or four differential channels (see the Block Diagram
at the end of the data sheet). The MAX1301 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 (+3 x V
REF
)/2, (-3 x V
REF
)/2 to 0, 0 to +3 x
V
REF
, -3 x V
REF
to 0, (±3 x V
REF
)/4, (±3 x V
REF
)/2, ±3 x
V
REF
] and three differential input ranges [(±3 x V
REF
)/2,
±3 x V
REF
, ±6 x V
REF
]. Additionally, all analog input chan-
nels are fault tolerant to ±16.5V. A fault condition on an
idle channel does not affect the conversion result of other
channels.
Figure 1. Typical Application Circuit
PIN
NAME FUNCTION
MAX1300 MAX1301
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 ve 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.
4–20mA
PLC
ACCELERATION
PRESSURE
TEMPERATURE
WHEATESTONE
WHEATESTONE
1µF
0.1µF
AGND2
DGNDOAGND3 DGND
AVDD2
DVDD
AVDD1
0.1µF 0.1µF 0.1µF
5.0V 5.0V 5.0V
MAX1300
CHO
CH1
CH2
CH3
CH4
CH5
CH6
CH7
REF
AGND1
REFCAP
0.1µF
3.3V
MC68HCXX
µC
DVDDO
SCLK
CS
DIN
SSTRB
DOUT
V
DD
SCK
I/O
MOSI
I/O
MISO
V
SS
MAX1300/MAX1301 8- and 4-Channel, ±3 x V
REF
Multirange Inputs,
Serial 16-Bit ADCs
www.maximintegrated.com
Maxim Integrated │ 13
Pin Description (continued)