Microchip Technology MCP3202-BI/P

Overview

MCP3202-BI/P from Microchip Technology is a 12-bit successive approximation analog-to-digital converter (ADC) with on-chip sample-and-hold, SPI serial interface (Modes 0,0 and 1,1), ±1 LSB INL (B-grade), single/dual-channel programmable analog inputs, and industrial temperature range (–40°C to +85°C). It serves as a precision sensor front-end in battery-powered data acquisition systems requiring low power and high linearity.

For engineers reviewing the MCP3202-BI/P datasheet, MCP3202-BI/P pinout, MCP3202-BI/P application, or MCP3202-BI/P equivalent, key selection considerations include its 100 ksps max sampling rate at 5V, 500 nA standby current, pseudo-differential input capability, and compatibility with microcontroller SPI peripherals operating in Mode 0,0 or Mode 1,1.

Technical Context

The MCP3202-BI/P implements a SAR architecture with internal 20 pF sample capacitor and 1.5-clock-cycle acquisition time. Its conversion sequence begins on the second rising CLK edge after the start bit, completing in 12 clock cycles with output shifting on falling edges.

It supports two analog input configurations via SPI command bits: dual single-ended (CH0/CH1) or pseudo-differential (IN+/IN−), where IN− is limited to ±100 mV relative to VSS and IN+ ranges from IN− to VDD+IN−. Reference voltage is tied directly to VDD (2.7V–5.5V), making LSB size supply-dependent.

Key Specifications

Pinout & Package

Package: 8-pin PDIP (Plastic Dual In-line Package), 0.300-inch body width, through-hole mounting.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MCP3202-CI/P and ADS7822U, the MCP3202-BI/P uniquely balances ±1 LSB linearity, ultra-low standby current, and single-supply simplicity-making it optimal for battery-operated industrial sensors where precision and power coexist.

Availability

MCP3202-BI/P is available at Aetrix Electronics and suitable for temperature monitoring, industrial process control, and battery-powered data loggers requiring stable component supply and long-term manufacturability.

Supply support for MCP3202-BI/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 is a U.S.-based semiconductor company specializing in microcontrollers, analog, and interface ICs with a focus on embedded control and connectivity solutions.

The MCP3202 product line delivers low-power, SPI-interfaced 12-bit SAR ADCs designed for sensor signal conditioning in resource-constrained industrial and portable systems.

FAQ

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

The MCP3202-BI/P achieves a maximum sampling rate of 100 ksps at 5V and 50 ksps at 2.7V. At 3.3V, its rated throughput falls between these values-typically ~70–80 ksps-based on linear interpolation of clock frequency limits (1.8 MHz at 5V, 0.9 MHz at 2.7V). The exact rate depends on clock stability and load; consult Figure 2-4 in DS21034F for empirical INL vs. rate curves at intermediate voltages. MCP3202-BI/P maintains ±1 LSB INL across this range when operated within spec.

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

No, the MCP3202-BI/P uses VDD as its internal reference voltage (VREF = VDD), eliminating the need for an external reference. This simplifies design and reduces BOM cost. However, because LSB size scales with VDD (LSB = VDD/4096), supply regulation directly impacts absolute accuracy. For applications demanding stable full-scale voltage, a well-regulated 3.3V or 5.0V rail is recommended. MCP3202-BI/P does not support separate VREF pin connection.

Can the MCP3202-BI/P operate in true differential mode?

No, the MCP3202-BI/P supports only pseudo-differential mode-not true differential. In pseudo-differential mode, CH0 acts as IN+ and CH1 as IN−, but IN− is restricted to ±100 mV around VSS (ground), not a full-rail differential input. This configuration rejects common-mode noise present on both inputs but cannot handle bipolar signals or large common-mode offsets. True differential operation (e.g., ±VREF inputs) is not supported by MCP3202-BI/P.

What SPI modes does the MCP3202-BI/P support, and how are they selected?

The MCP3202-BI/P supports SPI Modes 0,0 (CPOL=0, CPHA=0) and 1,1 (CPOL=1, CPHA=1) only. Mode selection is determined by the host MCU's clock polarity and phase configuration-not by any register setting on the MCP3202-BI/P. The device samples DIN on rising CLK edges and drives DOUT on falling edges, matching both modes. No hardware or software configuration is needed on MCP3202-BI/P to enable either mode.

How does the MCP3202-BI/P handle input source impedance, and what is the maximum recommended value?

The MCP3202-BI/P has an internal 20 pF sample capacitor and switch resistance (~1 kΩ). High source impedance (RS) slows charging, causing gain/linearity errors. To maintain <0.1 LSB INL deviation, RS must be ≤1 kΩ at 5V (per Figure 4-2). At lower VDD or higher temperatures, the limit tightens. For reliable 12-bit accuracy, keep RS <500 Ω; use an op-amp buffer (e.g., MCP601) for high-Z sensors. MCP3202-BI/P does not include programmable input buffers.