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NDIR gas sensor analog front end with SPI interface Hangzhou Ruimeng Tech MS91050 programmable gain amplifier

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NDIR gas sensor analog front end with SPI interface Hangzhou Ruimeng Tech MS91050 programmable gain amplifier

Voltage - Supply : 2.7V~5.5V

Operating Temperature : -40℃~+105℃

Interface : SPI

Description : SPI MSOP-10 Gas Sensor RoHS

Mfr. Part # : MS91050

Model Number : MS91050

Package : MSOP-10

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Product Description

The MS91050 is a single-channel analog front-end for Non-Dispersive Infrared (NDIR) gas sensors. It outputs a voltage proportional to the thermopile voltage, offering programmability to support various thermopile sensors. Key features include a programmable gain amplifier, "dark phase" offset cancellation, and an adjustable common-mode generator (1.15V or 2.59V) to enhance output dynamic range. Additional signal filtering (high-pass, low-pass, or band-pass) can be implemented via dedicated pins (A0 and A1) to mitigate out-of-band noise. Programming is accessible via an SPI interface. The device operates within a voltage range of 2.7V to 5.5V.

Advantages: Programmable gain amplifier, "dark phase" offset cancellation, external filtering support, common-mode generator with 8-bit DAC.

Applications: NDIR sensors, demand-controlled ventilation, building monitoring, automotive CO2 cabin control, automotive alcohol detection, industrial safety and security, greenhouse gas & Freon detection platforms.

Product Attributes

Brand: Relmon ()
Origin: China ()
Model: MS91050
Package: MSOP10

Technical Specifications

Parameter	Symbol	Test Conditions	Min	Typ	Max	Unit
Power Supply
Power Supply Voltage	VDD		2.7	3.3	5.5	V
Supply Current	IDD	All analog modules ON		3.1	3.9	mA
Shutdown Supply Current		All analog modules OFF		45	75	μA
Digital Supply Current				8		μA
Programmable Gain Amplifier (PGA1)
Bias Current	IBIAS	RL=10kΩ, CL =15pF		5	200	pA
Max Input Signal (High Gain)	VINMAX_HGM	Reference to CMOUT voltage, before limiting		±2		mV
Max Input Signal (Low Gain)	VINMAX_LGM			±12		mV
Input Offset Voltage	VOS		-165			μV
High Gain Mode	G_HGM			246		V/V
Low Gain Mode	G_LGM			41		V/V
Gain Error	GE	All gains			2.5	%
Output Voltage Range	VOUT		0.5		VDD-0.5	V
Small Signal Bandwidth	SSBW	Vin = 1mVpp, Gain = 246 V/V		18		kHz
Input Capacitance	Cin			100		pF
Programmable Gain Amplifier (PGA2)
Max Input Signal	VINMAX	GAIN=4V/V, RS =1kΩ, CL =1µF		1.65		V
Min Input Signal	VINMAN		0.82			V
Gain	G	4 programmable gains		4	32	dB
Gain Error	GE	All gains			2.5	%
Output Voltage Range	VOUT		0.2		VDD-0.2	V
Small Signal Bandwidth	SSBW	Gain = 32 V/V		360		kHz
Input Capacitance	Cin			5		pF
Combined PGA1 & PGA2
Gain	GAIN	PGA1 GAIN=41, PGA2 GAIN=4		163		V/V
Gain	GAIN	PGA1 GAIN=41, PGA2 GAIN=32		1303		V/V
Gain	GAIN	PGA1 GAIN=246, PGA2 GAIN=4		980		V/V
Gain	GAIN	PGA1 GAIN=246, PGA2 GAIN=32		7840		V/V
Gain Error	GE	All gains			5	%
Gain Temperature Coefficient	TCCGE	Gain = 163V/V to 1303V/V		6		ppm/ °C
Gain Temperature Coefficient	TCCGE	Gain = 980V/V to 7840V/V		20		ppm/ °C
PSRR	PSRR	DC, 3.0V to 3.6V supply, gain = 980V/V	90	110		dB
Output Offset Voltage Temp Drift	TCVOS	GAIN=163V/V		70		μV/°C
Output Offset Voltage Temp Drift	TCVOS	GAIN=7840V/V		1550		μV/°C
Common Mode Generator
Common Mode Voltage	VCM	VDD=3.3V		1.15		V
Common Mode Voltage	VCM	VDD=5V		2.59		V
Common Mode Voltage Accuracy				2		%
SPI Interface
Logic High Voltage	VIH		0.7×VDD			V
Logic Low Voltage	VIL			0.8		V
Logic Output High Voltage	VOH		2.6			V
Logic Output Low Voltage	VOL			0.4		V
Wake-up Time	tWU			1		ms
Continuous Clock Frequency	fSCLK			10		MHz

1912261709_Hangzhou-Ruimeng-Tech-MS91050_C475019.pdf

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