This is a comprehensive datasheet excerpt for the ADC10461, ADC10462, and ADC10464 ADCs. Here's a breakdown of the key information, summarized for clarity:

1. Product Overview:

️· What they are: 10-bit, high-speed Analog-to-Digital Converters (ADCs).
️· Key Feature: Use a unique multi-step conversion architecture that minimizes comparators and power consumption, allowing for fast conversion times.
️· Variations: The "x" indicates the number of multiplexer inputs.

2. Key Differences between ADC1046x Families

Device Family	ILE, TUE, PSS	THD, SNR, ENOB	Max. Conversion Time
ADC1046x	Guaranteed	-	900ns
ADC1046x	-	Guaranteed	900ns
ADC1066x	-	Guaranteed	466ns

3. Operating Modes:

️· Mode 1 (Start of Conversion via S/H): S/H pin controls the conversion start. Useful when you need precise timing of the start.
- S/H pulled low for at least 250ns
- INT goes low after 600ns (typical) indicating conversion complete.
️· Mode 2 (RD Mode): Conversion started by pulling S/H and RD low together.
- Simple initiation of conversion.
- INT goes low approximately 850ns after S/H and RD are pulled low.

4. Reference Considerations:

️· Two Reference Inputs: VREF+ and VREF-.
️· Span Definition: They define the full-scale range of the input signal.
️· Sensitivity vs. Linearity: Reducing the reference span increases sensitivity but can degrade linearity and offset errors. It's recommended to use reference voltages above 2V for optimal performance.
️· Bypassing: Both reference inputs *must* be bypassed with capacitors (10µF tantalum and 0.1µF ceramic) to minimize noise and ensure a stable voltage.
️· Low Impedance Source: A low-impedance voltage source is required to drive the reference inputs due to the potential for low resistance between the pins.

5. Analog Input:

️· Brief Connection: The analog input is briefly connected to a 600Ω series resistance and 35pF capacitance during each conversion cycle.
️· Source Impedance: Ideally, source impedance should be below 500Ω for the fastest sampling times. Operational amplifiers might be needed to buffer high-impedance sources.
️· Voltage Limits: Analog input voltages should stay between GND - 50mV and VCC + 50mV to avoid damage and ensure accurate conversions.

Key Takeaways for Practical Use:

️· Choose Mode Carefully: Select the operating mode based on your system's timing requirements.
️· Reference Circuit is Critical: Proper reference circuitry (low impedance source, bypassing) is essential for accuracy.
️· Source Impedance Matters: Keep the source impedance low for best performance.
️· Voltage Limits are Paramount: Avoid driving analog inputs beyond the specified voltage limits.