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Analog Devices Inc./Maxim Integrated MAX5421BEUB+T
- Part No.:
- MAX5421BEUB+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Digital Potentiometers
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MAX5421BEUB+T.pdf
- Description:
- IC DGTL POT 15KOHM 4TAP 10UMAX
- Quantity:
- Payment:
- Shipping:
Inventory:1,509
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Product details
Overview
MAX5421BEUB+T from Maxim Integrated is a digitally programmable precision voltage divider IC optimized for noninverting programmable-gain amplifier (PGA) configurations, delivering four fixed gain settings (1, 2, 4, 8), ±0.09% resistor ratio accuracy over –40°C to +85°C, and on-chip matching resistors for op-amp bias-current compensation in instrumentation-grade signal chains.
For engineers reviewing the MAX5421BEUB+T datasheet, MAX5421BEUB+T pinout, MAX5421BEUB+T application, or MAX5421BEUB+T equivalent, this device supports high-accuracy gain switching in low-power, dual-supply (±5V) or single-supply (+5V) PGA designs where impedance-matched W-node output and bias-current cancellation are critical.
Technical Context
The MAX5421BEUB+T implements a digitally controlled resistor ladder with CMOS/TTL-compatible 2-wire parallel interface (D0/D1), selecting one of four precision divider ratios via logic inputs. Its H–L end-to-end resistance is fixed at 15kΩ, while the W-node presents a constant 8kΩ impedance for gains 2/4/8 - ensuring stable settling time and minimal gain-dependent loading effects.
Unlike the MAX5420, the MAX5421BEUB+T integrates dedicated MATCH_H and MATCH_L terminals tied to an internal resistor matched to the W-node impedance (8kΩ for gains 2/4/8; switched connection for gain 1), enabling direct compensation of op-amp input bias current-induced offset in precision inverting or differential configurations.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Divider Ratio Accuracy | ±0.09% over –40°C to +85°C - guarantees gain error ≤0.09% across full industrial temperature range without calibration. |
| Supply Voltage Range | +5V single supply (VSS = GND) or ±5V dual supply (VSS = –5V) - supports both rail-to-rail and split-supply op-amp topologies. |
| Supply Current | 3µA typical (IDD + ISS) - enables ultra-low-power operation in battery-backed or energy-constrained systems. |
| H-to-L Resistance | 15kΩ - defines total divider resistance; sets absolute gain scale and noise floor in PGA feedback networks. |
| W-Node Impedance | 8kΩ (gains 2/4/8); ~500Ω (gain 1) - ensures consistent drive capability and settling behavior across all gain states. |
| Switching Time | 0.5µs (to 0.02% final value, 2pF load) - supports fast gain reconfiguration in real-time signal conditioning applications. |
| Digital Interface | CMOS/TTL-compatible 2-bit parallel (D0/D1) - eliminates need for level-shifting or serial protocol overhead. |
Pinout & Package
MAX5421BEUB+T is housed in a 10-pin µMAX package (3.05mm × 3.05mm × 0.6mm), thermally enhanced with exposed pad (not electrically connected), rated for 444mW continuous power dissipation at +70°C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VDD | Positive supply input (+5V or +4.75V to +5.25V); must be bypassed with 0.1µF ceramic capacitor to GND. |
| 2 | VSS | Negative supply input (–5V or GND); connects to system negative rail or ground in single-supply mode. |
| 3 | GND | Analog/digital reference ground; separate from VSS in dual-supply mode but tied to VSS in single-supply configuration. |
| 4, 5 | D0, D1 | 2-bit digital control inputs; logic levels define gain per truth table (00=1×, 01=2×, 10=4×, 11=8×). |
| 6 | MATCH_L | Low terminal of internal matching resistor; connects to op-amp inverting input or reference node for bias-current cancellation. |
| 7 | MATCH_H | High terminal of internal matching resistor; matches W-node impedance (8kΩ) for gains 2/4/8, or switches internally for gain 1. |
| 8 | L | Low terminal of main resistor divider; connects to op-amp output or feedback node in standard PGA topology. |
| 9 | W | Divider output node (feedback point); presents constant 8kΩ impedance for gains 2/4/8, enabling predictable loop stability. |
| 10 | H | High terminal of main resistor divider; connects to op-amp noninverting input or reference voltage source. |
Key Features
| Feature | Design Value |
|---|---|
| Four precision noninverting gains (1/2/4/8) | Digitally selected via D0/D1; eliminates mechanical switch wear and analog multiplexer errors in gain-switching circuits. |
| On-chip matching resistor (MATCH_H/MATCH_L) | Matches W-node impedance (8kΩ) for gains 2/4/8 - cancels op-amp input bias current error without external components. |
| Constant W-node impedance across gain states | 8kΩ for gains 2/4/8 ensures consistent op-amp loading, loop gain, and phase margin regardless of selected gain. |
| Ultra-low 3µA supply current | Enables use in always-on sensor front-ends and portable instrumentation without compromising battery life. |
| ±0.09% ratio accuracy over –40°C to +85°C | Meets industrial-grade precision requirements without system-level trimming or temperature compensation circuitry. |
Applications
| Programmable Instrumentation Amplifier | Medical Sensor Signal Conditioning |
|---|---|
|
Use Scenario: Gain adjustment in multi-range ECG or EEG front-ends to accommodate varying electrode-skin impedances and signal amplitudes. IC Role / Device Role / Timing Role: Precision voltage divider setting noninverting PGA gain; MATCH_H/MATCH_L terminals cancel bias current in low-input-bias op-amps (e.g., MAX4237). Use Value: Enables calibrated, software-selectable gain ranges (1×–8×) with <0.1% gain error across patient temperature variations and long-term drift. |
Use Scenario: Dynamic range optimization in portable pulse oximeters adapting to perfusion changes or motion artifacts. IC Role / Device Role / Timing Role: Digitally reconfigurable feedback network in transimpedance amplifier stage; W-node's constant 8kΩ impedance maintains stable bandwidth during gain transitions. Use Value: Achieves sub-microsecond gain switching (0.5µs) without transient overshoot, preserving pulse waveform fidelity during real-time adaptation. |
| Industrial Process Monitoring | Automated Test Equipment (ATE) |
|
Use Scenario: Multi-channel analog input modules scaling 4–20mA or ±10V sensor outputs to ADC full-scale range. IC Role / Device Role / Timing Role: Precision gain element in programmable input conditioning stage; ±0.09% ratio accuracy ensures traceable measurement uncertainty under thermal stress. Use Value: Eliminates per-channel calibration by guaranteeing gain tolerance within spec across –40°C to +85°C ambient, reducing test time and NRE. |
Use Scenario: Reconfigurable stimulus/response paths in modular ATE platforms requiring rapid gain switching between DUT types. IC Role / Device Role / Timing Role: Fast-settling voltage divider in programmable gain stages; 2-wire parallel interface allows synchronous gain updates across multiple channels. Use Value: Supports <1µs deterministic gain change with no software overhead - critical for high-throughput parametric testing sequences. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar digitally programmable voltage divider applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX5421AEUB+T | ±0.025% ratio accuracy (vs. ±0.09% for MAX5421BEUB+T); otherwise identical pinout, interface, and electrical specs. | Required where metrology-grade gain accuracy is mandated (e.g., calibration standards, Class I energy meters). | Select MAX5421AEUB+T when tighter ratio tolerance justifies higher cost and availability constraints. |
| MAX5421CEUB+T | ±0.5% ratio accuracy; same 10-pin µMAX package and functional interface; lower test cost and broader availability. | Suitable for cost-sensitive industrial controls where ±0.5% gain error is acceptable (e.g., motor feedback scaling, HVAC sensors). | Choose MAX5421CEUB+T for non-critical gain applications needing robust supply continuity and lower BOM cost. |
Compared with MAX5421AEUB+T and MAX5421CEUB+T, the MAX5421BEUB+T delivers optimal balance of industrial-grade accuracy (±0.09%), proven reliability in extended temperature operation, and broad distributor availability - making it the default selection for high-volume precision instrumentation designs.
Availability
MAX5421BEUB+T is available at Aetrix Electronics and suitable for programmable instrumentation amplifiers, medical sensor front-ends, and industrial process monitoring systems requiring stable component supply, guaranteed long-term manufacturability, and full traceability.
Supply support for MAX5421BEUB+T 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
Maxim Integrated (now part of Analog Devices) is a semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, medical, and communications applications.
The MAX5421BEUB+T belongs to Maxim's precision programmable resistor divider product line, designed specifically to replace mechanical potentiometers and discrete resistor networks in digitally controlled gain stages of high-fidelity signal chains.
FAQ
What is the supply voltage range supported by the MAX5421BEUB+T?
The MAX5421BEUB+T operates from a single +5V supply (VSS = GND) or dual ±5V supplies (VSS = –5V). Per specifications, VDD must be between +4.75V and +5.25V, and VSS must be between 0V and –5.25V. This flexibility allows integration into both rail-to-rail and traditional split-supply op-amp circuits without external level-shifting.
How does the MAX5421BEUB+T achieve bias-current compensation?
The MAX5421BEUB+T achieves bias-current compensation through integrated MATCH_H and MATCH_L terminals, which connect to an internal resistor precisely matched to the W-node impedance (8kΩ for gains 2/4/8). When used with an op-amp's inverting input, this matching resistor cancels voltage offset caused by input bias current - a feature absent in the MAX5420 series and critical for DC-accurate PGA designs.
What are the valid digital input logic levels for D0 and D1 on the MAX5421BEUB+T?
The MAX5421BEUB+T accepts CMOS/TTL-compatible logic levels on D0 and D1: VIH ≥ 2.4V and VIL ≤ 0.8V when referenced to VDD/GND. Input leakage is ±1µA maximum, and input capacitance is 5pF - allowing direct interfacing with microcontrollers, FPGAs, and logic families without buffering or level translation.
Can the MAX5421BEUB+T be used in single-supply applications?
Yes, the MAX5421BEUB+T supports single-supply operation with VSS connected to GND and VDD at +5V. In this mode, the device maintains full functionality including all four gain settings, ±0.09% ratio accuracy, and MATCH_H/MATCH_L bias compensation - provided the op-amp used in the PGA stage is rail-to-rail input/output capable and properly biased.
What is the switching time specification for the MAX5421BEUB+T, and what conditions apply?
The MAX5421BEUB+T has a specified switching time of 0.5µs - defined as the time for the W-node output to settle within 0.02% of its final value after a gain change, measured with a 2pF capacitive load and ±5V supplies. This performance assumes minimal PCB trace capacitance and use of low-input-capacitance op-amps to preserve speed in real-world layouts.
MAX5421BEUB+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Taper:
- Linear
- Configuration:
- Potentiometer
- Number of Circuits:
- 1
- Number of Taps:
- 4
- Resistance (Ohms):
- 15k
- Interface:
- Parallel
- Memory Type:
- Volatile
- Voltage - Supply:
- 5V, ±5V
- Features:
- -
- Tolerance:
- -
- Temperature Coefficient (Typ):
- -
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- 10-uMAX/uSOP
- Operating Temperature:
- -40°C ~ 85°C
- Resistance - Wiper (Ohms) (Typ):
- 500
MAX5421BEUB+T FAQ
1.How can I place an order for MAX5421BEUB+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX5421BEUB+T on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for MAX5421BEUB+T reliable?
The price and inventory of MAX5421BEUB+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX5421BEUB+T is usually 5 days.
3.What payment methods are accepted for MAX5421BEUB+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX5421BEUB+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX5421BEUB+T?
MAX5421BEUB+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX5421BEUB+T order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for MAX5421BEUB+T?
For technical support, including MAX5421BEUB+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX5421BEUB+T requirements.
6.How does Aetrix verify that MAX5421BEUB+T is sourced from the original manufacturer or authorized distributors?
All MAX5421BEUB+T products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that MAX5421BEUB+T meets industry standards.
7.What is the process for return or replacement of MAX5421BEUB+T?
All MAX5421BEUB+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX5421BEUB+T, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The MAX5421BEUB+T part is unused and in its original packaging.
Return procedure for MAX5421BEUB+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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