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Data Converters
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Data converters bridge the analog and digital domains. Analog-to-digital converters (ADCs) like the ADS1115 measure real-world signals — temperature, pressure, strain, current — with precision far beyond what a microcontroller's built-in 10- or 12-bit ADC can achieve. The ADS1115 offers 16-bit resolution, a programmable gain amplifier (×1 to ×24) for millivolt-level sensor signals, four single-ended or two differential input channels, and an I²C interface. It is the standard solution for load cells, thermocouples, RTDs, strain gauges and precision battery monitoring where every microvolt matters.
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Data Converters – Frequently Asked Questions
ADS1115 vs ADS1015 — what is the difference?
ADS1115 is 16-bit at up to 860 samples per second; ADS1015 is 12-bit at up to 3,300 SPS. Same package, same pinout, same I²C protocol, nearly the same price. Use ADS1115 for precision measurement (load cells, thermocouples, strain gauges). Use ADS1015 for higher-speed, lower-resolution tasks like vibration monitoring or audio-level detection.
What does the programmable gain amplifier (PGA) do?
The PGA amplifies small input signals before ADC conversion, improving effective resolution. Gains range from ÷1 (±6.144 V full-scale) to ×24 (±0.256 V full-scale). A typical 2 mV/V load cell at 5 V excitation outputs 0-10 mV — at PGA ×24, this maps to the ADS1115's full 16-bit range, giving you microvolt-level resolution without an external instrumentation amplifier.
Can I use an external voltage reference with the ADS1115?
No — the ADS1115 has an internal 2.048 V reference (±0.05%, 15 ppm/°C) and does not expose a REF pin. If you need external reference flexibility or higher accuracy, use the ADS1256 (24-bit, 8 channels, external REF) or ADS1118 (16-bit, 4 channels, SPI interface with internal reference).
How many ADS1115 can I put on one I²C bus?
Up to four, using the ADDR pin to select addresses 0x48, 0x49, 0x4A and 0x4B. That gives you 16 single-ended or 8 differential channels total. For more channels, use an I²C multiplexer like TCA9548A.
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