MCP3421
Every spec below is cited to the manufacturer datasheet. Pick your exact ordering code, compare the closest alternatives, then ask the assistant what it means for your design.
What the MCP3421 family does
The MCP3421 is an 18-bit delta-sigma analog-to-digital converter featuring differential inputs, an on-board 2.048V reference, and a programmable gain amplifier. It operates from a single 2.7V to 5.5V supply with low current consumption of 145µA typical in continuous mode. The device supports data rates from 3.75 to 240 samples per second and offers 18-bit resolution at the lowest rate. It includes self-calibration for offset and gain per conversion. Typically used in portable instrumentation, weigh scales, temperature sensing with RTDs or thermocouples, and bridge sensing for pressure or strain applications, this component fits in a small SOT-23-6 package and communicates via a two-wire I2C serial interface.
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Every number above is cited straight from the datasheet — ask what they mean for your design, and the assistant answers from the same source documents.
MCP3421 datasheet parameters
| Parameter | Min | Typ | Max | Conditions | Source |
|---|---|---|---|---|---|
| quiescent current | — | 155 µA | 190 µA | VDD = 5.0V; Power Requirements | Microchip datasheet, p. 3 — ELECTRICAL CHARACTERISTICS (CONTINUED) |
| supply voltage range | 2.7 V | — | 5.5 V | Microchip datasheet, p. 1 | |
| input offset voltage drift | — | 50 nV/°C | — | VDD = 5.0V; Electrical Specifications:Unless otherwise specified, all parameters apply for TA = -40°C to +85°C, VDD = +5.0V, VSS = 0V, VIN+ = VIN- = VREF/2. All ppm units use 2*VREFas full-scale range. | Microchip datasheet, p. 3 — ELECTRICAL CHARACTERISTICS (CONTINUED) |
| input offset voltage | — | 15 µV | 40 µV | Tested at PGA = 1VDD = 5.0V and DR = 3.75 SPS; Electrical Specifications:Unless otherwise specified, all parameters apply for TA = -40°C to +85°C, VDD = +5.0V, VSS = 0V, VIN+ = VIN- = VREF/2. All ppm units use 2*VREFas full-scale range. | Microchip datasheet, p. 3 — ELECTRICAL CHARACTERISTICS (CONTINUED) |
| cmrr | — | 105 dB | — | at DC and PGA = 1,; common; Electrical Specifications:Unless otherwise specified, all parameters apply for TA = -40°C to +85°C, VDD = +5.0V, VSS = 0V, VIN+ = VIN- = VREF/2. All ppm units use 2*VREFas full-scale range. | Microchip datasheet, p. 3 — ELECTRICAL CHARACTERISTICS (CONTINUED) |
| operating temperature | -40 °C | — | 125 °C | Thermal Characteristics | Microchip datasheet, p. 3 — ELECTRICAL CHARACTERISTICS (CONTINUED) |
| clock frequency | 0 Hz | — | 400 kHz | Fast Mode | Microchip datasheet, p. 18 — TABLE 5-4: I²C SERIAL TIMING SPECIFICATIONS |
| psrr | — | 100 dB | — | TA = +25°C, VDD = 2.7V to 5.5V, PGA = 1; Electrical Specifications:Unless otherwise specified, all parameters apply for TA = -40°C to +85°C, VDD = +5.0V, VSS = 0V, VIN+ = VIN- = VREF/2. All ppm units use 2*VREFas full-scale range. | Microchip datasheet, p. 3 — ELECTRICAL CHARACTERISTICS (CONTINUED) |
| adc resolution | — | 18 bit | — | Microchip datasheet, p. 1 | |
| rise time | — | — | 4.08 µs | From VILto VIH, Cb = 100 pFCb = 400 pF; (note 1); High Speed Mode | Microchip datasheet, p. 19 — TABLE 5-4: I²C SERIAL TIMING SPECIFICATIONS (CONTINUED) |
| fall time | — | — | 4.08 µs | From VIHto VIL, Cb = 100 pFCb = 400 pF; (note 1); High Speed Mode | Microchip datasheet, p. 19 — TABLE 5-4: I²C SERIAL TIMING SPECIFICATIONS (CONTINUED) |
| output voltage low | — | — | 400 mV | IOL = 3 mA, VDD = +5.0V; I2C Digital Inputs and Digital Outputs | Microchip datasheet, p. 3 — ELECTRICAL CHARACTERISTICS (CONTINUED) |
| sample rate | 176 Hz | 240 Hz | 328 Hz | S1, S0 = '00', (12 bits mode); (note 3); System Performance | Microchip datasheet, p. 2 — ELECTRICAL CHARACTERISTICS |
| settling time | — | 267 ms | — | 18-bit conversion mode, 3.75 SPS data rate (includes auto-calibration of offset and gain) | Microchip datasheet, p. 1 |
| channel count | — | 1 | — | Microchip datasheet, p. 1 |
Closest matches to MCP3421
ADS1110A0IDBVR
4.0× lower settling time, 3.3× lower rise time, 1.1× lower adc resolution
ADS1255
2.0× higher input offset voltage drift, 2.0× lower output voltage low, 1.6× lower supply voltage range
CS5530-IS
16.0× higher sample rate, 5.0× lower input offset voltage drift, 3.4× higher fall time
HX711
9.0× higher quiescent current, 1.5× higher settling time, 1.3× higher adc resolution
ADS1100
1.9× lower sample rate, 1.1× lower adc resolution, 1.1× lower cmrr
LTC2400
2.0× lower settling time, 1.6× higher operating temperature, 1.3× higher adc resolution
ADS1114
3.6× higher sample rate, 3.3× lower rise time, 2.7× lower output voltage low
ADS1246
8.3× higher sample rate, 1.9× higher operating temperature, 1.4× higher psrr
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