Can the analog-digital breakout board be set up to use the aref (analog reference) pin on the arduino with which it is communicating?

The AREF pin on the Arduino is an input pin, not output. You can still use the Arduino and the Analog-digital breakout board work at the same 5V voltage and have a different AREF, let's say 3.3V. AREF of 3.3V means that the Arduino will translate 3.3V as the max value of 1024. By default, AREF pin is open and Arduino assumes a value of 5V. If you apply a different AREF value to the physical pin, you need to use AnalogReference() to set it to use the EXTERNAL value and not the DEFAULT.

what is the bit-rate of the A/D?

This is not an Analog to Digital converter. It is based on the CD74HC4067 digitally controlled analog switches. You can redirect any of the 16 signals to a common output. Propagation delay @ 5V is 6ns

Will this increase the number of digital pins on an Arduino nano?

No, this board only multiplexes (switches) 16 signals to one (input or output). To increase the digital pins, you need a port expander. Search for 16 Output I/O Expander Breakout - SX1509

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Analog/Digital MUX Breakout for Arduino

Product ID: 4788170

Details

Brand
SparkFun
Maximum Supply Voltage
6 Volts
Mounting Type
Board Mount
Upper Temperature Rating
125 Degrees
Number of Channels
16

⚡70Ω Resistance

🔋2V-6V Operation

🔌16-Channel MUX

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Details

Brand
SparkFun
Maximum Supply Voltage
6 Volts
Mounting Type
Board Mount

Description

🔧 Elevate Your Projects with Precision Switching!

USER FRIENDLY - Easy integration with Arduino for rapid prototyping.
COMPACT DESIGN - Space-saving solution for your Arduino projects.
UNLOCK VERSATILITY - Seamlessly switch between analog and digital signals.
WIDE VOLTAGE RANGE - Operate effortlessly from 2V to 6V for diverse applications.
EFFICIENT PERFORMANCE - Experience low resistance for optimal signal integrity.

The Analog/Digital MUX Breakout for Arduino features a 16-channel multiplexer/demultiplexer (CD74HC4067ON) with a low resistance of 70Ω at 4.5V and 60Ω at 6V, allowing for versatile operation between 2V and 6V, making it an essential tool for any Arduino enthusiast.

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