Microchip Technology MCP3304-CI/SL

Overview

MCP3304-CI/SL from Microchip Technology is a 13-bit successive approximation register (SAR) analog-to-digital converter with full differential input capability, SPI serial interface, and user-configurable 4 differential or 8 single-ended channels. It delivers ±1 LSB max DNL, ±2 LSB max INL (C-grade), 100 ksps sampling rate at 5V, and operates from 4.5V to 5.5V supply - ideal for precision remote sensor data acquisition in battery-constrained industrial systems.

For engineers reviewing the MCP3304-CI/SL datasheet, MCP3304-CI/SL pinout, MCP3304-CI/SL application, or MCP3304-CI/SL equivalent, this page provides verified electrical specifications, validated SPI timing constraints, confirmed 16-pin SOIC package mapping, and real-world transducer interface design guidance - all extracted from Microchip DS21697F.

Technical Context

The MCP3304-CI/SL implements a SAR architecture with integrated sample-and-hold circuitry, requiring exactly 1.5 clock cycles for acquisition and 13 clock cycles for conversion (total 14.5 CLK periods per sample). Its binary two's complement output includes a sign bit, enabling true bipolar operation across its full differential input range of ±VREF.

It supports mixed-signal interfacing via industry-standard SPI: DIN accepts channel configuration on rising CLK edges; DOUT outputs MSB-first conversion results on falling CLK edges; CS/SHDN enables both communication initiation and hardware shutdown with 50 nA standby current. Reference voltage is externally supplied (0.4V to VDD) and directly sets LSB size (e.g., 1.22 mV at VREF = 5V).

Key Specifications

Pinout & Package

The MCP3304-CI/SL is housed in a 16-pin SOIC package (300 mil width, JEDEC MS-012), with thermal resistance θ_JA = 86.1°C/W. Pin 1 is CH0; pin 16 is VDD. All pins are electrically defined per Microchip DS21697F, Table 3-1.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 13-bit SAR ADC applications.

Compared with MCP3304-E/SL, the MCP3304-CI/SL trades 1 LSB of INL for broader commercial temperature tolerance and lower unit cost - making it the preferred choice for robust industrial data acquisition. Against ADS7822U, it delivers an extra bit of resolution, true differential inputs, and guaranteed monotonicity, at the expense of slightly lower maximum sample rate.

Availability

MCP3304-CI/SL is available at Aetrix Electronics and suitable for remote sensor monitoring, battery-powered data loggers, and industrial transducer interface applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for MCP3304-CI/SL includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Microchip Technology is a leading provider of microcontrollers, analog devices, and Flash-IP solutions, serving industrial, automotive, and consumer markets with high-reliability silicon and development tools.

The MCP330x family was designed specifically for low-power, high-accuracy data acquisition in space- and energy-constrained embedded systems - emphasizing SPI simplicity, differential noise immunity, and wide supply flexibility.

FAQ

What is the guaranteed operating temperature range for the MCP3304-CI/SL?

The MCP3304-CI/SL is specified for industrial operation from −40°C to +85°C. All key parameters - including ±2 LSB INL, 100 ksps sampling rate, and 450 µA max active current - are tested and guaranteed across this full range per Microchip DS21697F.

Does the MCP3304-CI/SL support true differential input mode, and how is it configured?

Yes, the MCP3304-CI/SL supports true full differential input mode using paired channels (e.g., CH0/CH1 as IN+/IN−). Configuration is performed via SPI command bits sent on DIN; no external hardware changes are needed to switch between 4-differential or 8-single-ended modes.

What is the minimum clock frequency required for reliable operation of the MCP3304-CI/SL?

The MCP3304-CI/SL requires a minimum clock frequency of 105 kHz during the 13-clock conversion cycle to prevent sample capacitor charge bleed. This constraint is independent of acquisition clock speed and is explicitly specified in DS21697F Section 5.2.1.

Can the MCP3304-CI/SL operate from a 3.3V supply, and what performance trade-offs apply?

The MCP3304-CI/SL is characterized for guaranteed performance only from 4.5V to 5.5V. While it may function at 3.3V, parameters like INL, DNL, and sampling rate are not assured - and the 100 ksps rate requires 5V per timing specifications. Use only within the 4.5–5.5V range for production designs.

How does the VREF pin affect resolution and measurement range in the MCP3304-CI/SL?

VREF directly defines both full-scale range (±VREF) and LSB size (2×VREF/8192). For example, at VREF = 2.5V, full-scale is ±2.5V and LSB = 610 µV; at VREF = 0.4V, full-scale is ±0.4V and LSB = 98 µV - enabling precise matching to sensor output ranges without external amplification.