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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