SGM8522
Dual-channel precision op-amp with 50uV offset, 2.5MHz bandwidth, and low power consumption of 180uA per channel.
Product Overview
Description
The SGM8522 provides dual precision op-amp channels in a compact MSOP-8 package.
With 50uV maximum offset voltage and 2.5MHz bandwidth, it balances precision with AC performance.
The low quiescent current of 180uA per channel makes it ideal for portable battery-powered applications.
Product Series
SGM
Primary Application
Active filters
Key Features
- Dual-channel precision amplifier
- Low offset voltage: 50uV max
- Wide bandwidth: 2.5MHz
- Rail-to-rail input and output
- Low power: 180uA per channel
Specifications
| Supply Voltage | 2.5V - 5.5V |
|---|---|
| Offset Voltage | 50uV (max) |
| Bandwidth | 2.5MHz |
| Slew Rate | 1.5V/us |
| Noise Density | 20nV/sqrt(Hz) |
| Package | MSOP-8, SOP-8 |
Applications
Active filters
Electronic system design
Instrumentation amplifiers
Electronic system design
Audio preamplification
Electronic system design
Sensor conditioning
Sensor signal conditioning
Battery-powered systems
Battery and charging management
FAE Expert Insights
"The SGM8522 is my go-to recommendation for designs requiring dual precision channels. The 50uV offset is sufficient for most industrial sensor applications while the 2.5MHz bandwidth handles moderate-speed signals effectively. I have successfully used this part in active filter designs and instrumentation amplifier configurations. The MSOP-8 package offers good thermal performance while saving board space compared to two single op-amps. For differential amplifier designs, using both channels in the same package provides better channel-to-channel matching than discrete singles."
Excellent dual-channel solution for active filters and instrumentation
— David Wang, BeiLuo
Frequently Asked Questions
What is the channel-to-channel isolation of the SGM8522?
The SGM8522 provides excellent channel-to-channel isolation of over 120dB at DC, decreasing to approximately 80dB at 1kHz. This high isolation prevents crosstalk between channels in multi-channel designs. The isolation is maintained across the full operating temperature range. For critical applications requiring maximum isolation, separate supply decoupling for each channel is recommended, along with careful PCB layout to minimize capacitive coupling between channels.
The SGM8522 is suitable for multi-channel precision applications. Use separate decoupling capacitors for each channel for best isolation.
Can the SGM8522 be used for active filter designs?
Yes, the SGM8522 is well-suited for active filter applications. The 2.5MHz bandwidth allows implementation of filters with cutoff frequencies up to approximately 250kHz (following the 10x rule). The 50uV offset voltage ensures minimal DC error in the passband. Both Sallen-Key and multiple feedback topologies work well with this op-amp. For best filter performance, use precision resistors and capacitors (1% or better) and maintain short trace lengths to minimize parasitic capacitance.
Use the SGM8522 for active filters up to 250kHz cutoff. Contact our FAE team for filter design assistance.
What is the power consumption of the SGM8522 at 3.3V?
At 3.3V supply, the SGM8522 consumes approximately 180uA per channel (360uA total for both channels) with no load. This low power consumption makes it ideal for battery-powered applications. The power consumption remains relatively constant across the operating temperature range. For ultra-low power applications, consider using the shutdown feature if available, or select the SGM8522's low-power variants for even lower quiescent current.
Calculate total power budget including both channels. The SGM8522 is suitable for battery-powered designs requiring moderate precision.
How do I configure the SGM8522 as an instrumentation amplifier?
To create a 3-op-amp instrumentation amplifier using the SGM8522: 1) Use both channels of the SGM8522 for the input buffer stage (differential amplifier front end); 2) Add a third single op-amp (such as SGM8551) for the difference amplifier stage; 3) Set the gain using precision resistors in the input stage; 4) Match resistor ratios carefully for good CMRR. The dual package ensures better matching between the two input buffers compared to using two separate single op-amps.
Use SGM8522 for the input stage and SGM8551 for the output difference amplifier. Contact us for instrumentation amplifier design guidance.
What is the phase margin of the SGM8522?
The SGM8522 has a phase margin of approximately 65 degrees with unity-gain feedback, indicating good stability in follower configurations. The gain margin is typically 15dB. These stability margins ensure reliable operation across process and temperature variations. For capacitive loads greater than 100pF, a small isolation resistor (50-100 ohms) in series with the output is recommended to maintain stability. The op-amp is internally compensated and does not require external compensation components.
The SGM8522 is stable in most configurations. Add series output resistor for capacitive loads above 100pF.