Microchip Technology MCP3302T-BI/SL

Overview

MCP3302T-BI/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-programmable configuration for either two differential or four single-ended input channels. It delivers ±1 LSB integral nonlinearity (INL), 100 ksps sampling rate at 5V, and ultra-low 50 nA standby current - enabling high-precision data acquisition in battery-powered remote sensors and portable instrumentation.

For engineers reviewing the MCP3302T-BI/SL datasheet, MCP3302T-BI/SL pinout, MCP3302T-BI/SL application, or MCP3302T-BI/SL equivalent, key selection criteria include its 13-bit bipolar resolution with two's complement output, industrial-grade -40°C to +85°C operation, TSSOP-14 package compatibility, and differential input rejection of >79 dB common-mode interference.

Technical Context

The MCP3302T-BI/SL implements a SAR architecture with integrated sample-and-hold circuitry, requiring exactly 13 clock cycles for conversion and 1.5 clock cycles for acquisition. Its full differential input stage supports true bipolar operation across ±VREF, with configurable channel mapping via SPI command bits.

It uses binary two's complement coding for output, supports VREF from 0.4 V to VDD, and achieves 78 dB SINAD and 92 dB SFDR at 1 kHz input - confirming suitability for medium-speed precision measurement where noise floor and harmonic distortion must be tightly controlled.

Key Specifications

Pinout & Package

The MCP3302T-BI/SL is housed in a 14-lead TSSOP package (4.4 mm × 5.0 mm, 0.65 mm pitch), optimized for space-constrained PCB layouts while maintaining thermal resistance of 100°C/W (θ_JA). All pins are electrically and mechanically validated per Microchip DS21697F.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS7816U and MCP3304T-I/SL, the MCP3302T-BI/SL uniquely balances low-power operation, differential input capability, and compact 14-pin TSSOP packaging - making it optimal for space- and energy-constrained designs requiring robust noise immunity without sacrificing channel efficiency.

Availability

MCP3302T-BI/SL is available at Aetrix Electronics and suitable for remote sensor nodes, battery-powered data loggers, and industrial transducer interfaces requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.

Supply support for MCP3302T-BI/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 global semiconductor company specializing in microcontrollers, analog devices, and interface ICs, with a strong focus on embedded control and low-power precision signal conditioning.

The MCP3302/04 product line was designed specifically for high-accuracy, low-power data acquisition in resource-constrained environments - emphasizing differential noise rejection, SPI simplicity, and extended battery life without compromising 13-bit resolution.

FAQ

What is the maximum sampling rate of the MCP3302T-BI/SL and under what conditions is it guaranteed?

The MCP3302T-BI/SL achieves a maximum sampling rate of 100 ksps when operated at VDD = 5V and FCLK = 2.1 MHz (21 × FSAMPLE), with VREF = 5V and full differential input configuration. This rate is fully characterized and guaranteed over the industrial temperature range (-40°C to +85°C) per DS21697F. At lower supply voltages (e.g., 2.7 V), the maximum rate decreases to maintain timing margins and accuracy.

Does the MCP3302T-BI/SL support true differential input mode, and how is it configured?

Yes, the MCP3302T-BI/SL supports true full differential input mode (e.g., CH0 as IN+, CH1 as IN−), which is enabled by setting the appropriate configuration bits in the SPI command word. This mode delivers >79 dB common-mode rejection and enables bipolar measurement across ±VREF. The device does not require external op-amps or level-shifting networks to implement this functionality - all biasing and switching are internal.

What is the meaning of the 'B' grade in MCP3302T-BI/SL, and how does it affect INL performance?

The 'B' in MCP3302T-BI/SL denotes the B-grade temperature and accuracy specification, guaranteeing ±1 LSB maximum integral nonlinearity (INL) over the full -40°C to +85°C operating range. This is tighter than the C-grade (±2 LSB INL) and directly impacts system calibration stability - especially in applications like precision sensor interfacing where end-point linearity errors must remain below 0.012% of full scale.

Can the MCP3302T-BI/SL operate from a 3.3 V supply, and what performance trade-offs apply?

The MCP3302T-BI/SL is specified to operate from 2.7 V to 5.5 V, but its full AC/DC performance (including 100 ksps sampling, ±1 LSB INL, and 78 dB SINAD) is only guaranteed within the 4.5 V to 5.5 V supply range. At 3.3 V, conversion speed drops, dynamic performance degrades (e.g., SINAD falls to ~72 dB), and VREF must be scaled accordingly - making it unsuitable for precision applications unless recalibrated and derated.

How does the CS/SHDN pin function, and is it necessary to toggle it between conversions?

The CS/SHDN pin serves dual functions: pulled low to initiate conversion and data transfer, and pulled high to place the MCP3302T-BI/SL into 50 nA standby mode. It must be toggled - held high between conversions - because the device does not auto-shutdown after conversion completion. Leaving CS/SHDN low continuously disables standby, increasing average current to ~450 µA and negating the ultra-low-power advantage of the MCP3302T-BI/SL.