Microchip Technology MCP3202-CI/P

Overview

MCP3202-CI/P from Microchip Technology is a 12-bit successive approximation analog-to-digital converter (ADC) with on-chip sample-and-hold, SPI interface (Modes 0,0 and 1,1), ±2 LSB INL, 100 ksps max sampling rate at 5V, and 8-pin PDIP package. It supports dual single-ended or pseudo-differential analog inputs and operates across 2.7V–5.5V for sensor interface and battery-powered data acquisition.

For engineers reviewing the MCP3202-CI/P datasheet, MCP3202-CI/P pinout, MCP3202-CI/P application, or MCP3202-CI/P equivalent, key selection factors include its guaranteed ±2 LSB integral nonlinearity over –40°C to +85°C, low 500 nA standby current, SPI timing compatibility with legacy MCU hardware, and direct VDD-referenced conversion without external reference.

Technical Context

The MCP3202-CI/P implements a SAR architecture with 1.5-clock-cycle analog input sampling starting on the second rising CLK edge after the start bit. Conversion completes in 12 clock cycles, delivering a 12-bit straight-binary output on DOUT synchronized to CLK falling edges.

Its analog front-end supports programmable configuration via SPI command bits: SGL/DIFF selects single-ended vs. pseudo-differential mode; ODD/SIGN selects channel or polarity; MSBF controls MSB-first/LSB-first output format. Input voltage range in pseudo-differential mode is constrained by IN− (±100 mV around VSS) and IN+ (IN− to VDD + IN−).

Key Specifications

Pinout & Package

Package: 8-pin PDIP (0.300" width), through-hole mounting, RoHS-compliant lead finish.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 12-bit SAR ADC applications.

Compared with MCP3202-CI/MS, the MCP3202-CI/P offers identical performance in a through-hole PDIP package for prototyping and legacy board repair; versus ADS7822U, it trades raw speed for simplified power architecture and lower system-level component count.

Availability

MCP3202-CI/P is available at Aetrix Electronics and suitable for industrial sensor interface, portable data acquisition, and process control applications requiring stable component supply, long-term obsolescence management, and traceable sourcing.

Supply support for MCP3202-CI/P 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 Inc. is a leading provider of microcontrollers, analog devices, and Flash-IP solutions, headquartered in Chandler, Arizona.

The MCP3202 belongs to Microchip's precision analog product line, designed specifically for cost-sensitive, low-power embedded systems needing reliable 12-bit digitization without external references or complex support circuitry.

FAQ

What is the maximum sampling rate of the MCP3202-CI/P at 3.3V supply?

The MCP3202-CI/P achieves a maximum sampling rate of 100 ksps at 5V and 50 ksps at 2.7V. At 3.3V, the datasheet specifies operation within the 2.7V–5.5V range but does not provide an interpolated rate; design margin dictates using the 50 ksps rating for robustness. The MCP3202-CI/P clock frequency limit scales linearly-1.8 MHz at 5V, 0.9 MHz at 2.7V-so at 3.3V, fCLK ≈ 1.2 MHz is appropriate, supporting ~65–70 ksps in practice. Always verify timing margins per Figure 2-4 and Section 6.2.

Does the MCP3202-CI/P require an external voltage reference?

No, the MCP3202-CI/P uses VDD as its internal reference voltage (VREF = VDD), eliminating the need for an external reference IC. This simplifies design, reduces BOM cost, and avoids reference-related errors like drift or noise coupling. Equation 4-1 confirms the digital output code is calculated as (4096 × VIN) / VDD. Because VDD serves as both supply and reference, supply regulation quality directly impacts ADC accuracy-designers should use a clean, low-noise 2.7V–5.5V source with adequate decoupling near the VDD/VREF pin of the MCP3202-CI/P.

How is pseudo-differential mode configured on the MCP3202-CI/P?

Pseudo-differential mode on the MCP3202-CI/P is selected by setting the SGL/DIFF bit to '0' in the 4-bit SPI configuration word sent before each conversion. When active, CH0 becomes IN+ and CH1 becomes IN−. The IN− input is restricted to ±100 mV around VSS, while IN+ ranges from IN− to VDD + IN−. This configuration cancels common-mode noise present on both inputs, improving effective resolution in noisy environments. The ODD/SIGN bit determines polarity: '0' yields IN+ − IN−, '1' yields IN− − IN+. The MCP3202-CI/P does not perform true differential subtraction internally-it relies on external signal conditioning to meet the IN− constraint.

What are the thermal resistance characteristics of the MCP3202-CI/P package?

The MCP3202-CI/P is packaged in an 8-pin PDIP (0.300" width), which has a specified junction-to-ambient thermal resistance (θJA) of 89.5°C/W. This value assumes standard JEDEC 2S2P test conditions (single-layer board, 1 in² copper). In practical PCB layouts with modest copper pour, actual θJA may range from 75–105°C/W. With a maximum junction temperature of +150°C and ambient up to +85°C, the MCP3202-CI/P can dissipate up to ~700 µW continuously (ΔT = 65°C ÷ 89.5°C/W) without exceeding limits. Its typical active current of 375 µA at 5V results in ~1.9 mW power dissipation-well within safe margin.

Can the MCP3202-CI/P interface directly with a Raspberry Pi GPIO SPI port?

Yes, the MCP3202-CI/P interfaces directly with Raspberry Pi's hardware SPI peripheral using Mode 0,0 (CPOL = 0, CPHA = 0), which matches the device's native timing. The Pi's 3.3V GPIO levels are compatible with MCP3202-CI/P's VIH (≥2.1V) and VIL (≤1.35V) thresholds at VDD = 3.3V. Software must send the 4-bit configuration word (start bit + SGL/DIFF + ODD/SIGN + MSBF) followed by clocking 12+ cycles to read DOUT. Libraries such as spidev or gpiozero abstract this sequence. Note: the MCP3202-CI/P's CS/SHDN pin must be controlled separately via GPIO, as Pi's hardware CS is not fully compliant with the device's requirement to assert CS low *before* the first clock edge.