
8
Maxim Integrated
16-Bit, Single-Channel, Ultra-Low-Power, Delta-
Sigma ADCs with Programmable Gain and GPIO
MAX11203/MAX11213
Pin Description
Pin Configuration
16
15
14
13
12
11
10
9
1
2
3
4
5
6
7
8
GPIO1
GPIO4
CLK
SCLK
RDY/DOUT
DIN
CS
DVDD
AVDD
TOP VIEW
QSOP
GPIO2
GPIO3
REFN
GND
REFP
AINN
AINP
+
MAX11203
MAX11213
PIN
NAME
FUNCTION
1
GPIO1
General-Purpose I/O 1. Register controllable using SPI.
2
GPIO2
General-Purpose I/O 2. Register controllable using SPI.
3
GPIO3
General-Purpose I/O 3. Register controllable using SPI.
4
GND
Ground. Ground reference for analog and digital circuitry.
5
REFP
Differential Reference Positive Input. REFP must be more positive than REFN. Connect REFP to a voltage
between AVDD and GND.
6
REFN
Differential Reference Negative Input. REFN must be more negative than REFP. Connect REFN to a
voltage between AVDD and GND.
7
AINN
Negative Fully Differential Analog Input
8
AINP
Positive Fully Differential Analog Input
9
AVDD
Analog Supply Voltage. Connect a supply voltage between +2.7V and +3.6V with respect to GND.
10
DVDD
Digital Supply Voltage. Connect a digital supply voltage between +1.7V and +3.6V with respect to GND.
11
CS
Active-Low, Chip-Select Logic Input
12
DIN
Serial-Data Input. Data present at DIN is shifted to the device’s internal registers at the rising edge of
the serial clock at SCLK, when the device is accessed for an internal register write or for a command
operation.
13
RDY/DOUT
Data Ready Output/Serial-Data Output. This output serves a dual function. In addition to the serial-data
output function, the RDY/DOUT also indicates that the data is ready when the RDY is logic-low. RDY/
DOUT changes on the falling edge of SCLK.
14
SCLK
Serial-Clock Input. Apply an external serial clock to SCLK.
15
CLK
External Clock Signal Input. When external clock mode is selected (EXTCLK = 1), provide a 2.4576MHz
or 2.048MHz clock signal at CLK. Other frequencies can be used, but the data rate and digital filter notch
frequencies scale accordingly.
16
GPIO4
General-Purpose I/O 4. Register controllable using SPI.