[LeifCarrotson]

Weirdly, no, a lot of the time.

It's $1 for an STM32F0 or $2.65 for an STM32F4 with a quantity of ten 12-bit 2.4 MSPS ADCs included, but a single-channel SOT23-5 ADC chip is also $1, and if you wanted 10 single-ended channels at 2 MSPS you're looking at $8 per device.

You typically don't use an off-chip ADC peripheral when most every MCU has a few channels of ADC on-board unless you've got special requirements (like sigma-delta high-resolution, simultaneous sampling, very high sample rate, etc), and those requirements cost money.

[markrages]

To be clear, there is a quantity of one ADC in the STM32F4, with a multiplexer in front. You could emulate this with an analog switch like 74HC4051, which costs pennies in quantity.

[magicalhippo]

To the extra clear, there can be either one or three ADCs in the STM32F4, depending on model. The STM32F405/F415 models for example have three.

STM32 models with more than one ADC, they can typically be interleaved to increase effective sampling speed. In the case of the STM32F405/F415, the three 2.4 MSPS ADCs can be interleaved for up to 7.2 MSPS.

The STM32 ADCs are also quite accurate with proper board layout in my experience, so you actually get close to the 12 bits. Some newer STM32 models also support hardware oversampling to effectively get close to 16 bits.

[1]: https://www.st.com/en/microcontrollers-microprocessors/stm32...