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Analog Devices Inc./Maxim Integrated MAX4462HETT+T
- Part No.:
- MAX4462HETT+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 6-WDFN Exposed Pad
- Datasheet:
-
MAX4462HETT+T.pdf
- Description:
- IC INST AMP 1 CIRCUIT 6TDFN
- Quantity:
- Payment:
- Shipping:
Inventory:12,500
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Product details
Overview
The MAX4462HETT+T from Maxim Integrated is a precision rail-to-rail output instrumentation amplifier with fixed gain of 100 V/V, REF input for bipolar operation in single-supply systems, ±0.1% gain accuracy, 100 µV typical input offset voltage, and 2.5 MHz gain-bandwidth product. It enables high-accuracy differential signal amplification in low-voltage, battery-powered medical sensors and industrial strain-gauge interfaces.
For engineers reviewing the MAX4462HETT+T datasheet, MAX4462HETT+T pinout, MAX4462HETT+T application, or MAX4462HETT+T equivalent, key selection considerations include its REF-pin–enabled bipolar output capability, ground-sensing input common-mode range (–0.1 V to VDD – 1.7 V), 1 pA typical input bias current, and TDFN-EP 6-pin package compatibility with space-constrained PCB layouts.
Technical Context
The MAX4462HETT+T implements Maxim's proprietary indirect current-feedback architecture, converting differential input voltage to current and comparing it against a precision feedback current derived from the output. This design achieves both ultra-low input bias current (1 pA typ) and enhanced common-mode rejection (120 dB typ at DC).
Unlike traditional three-op-amp IAs, it supports true ground-sensing inputs while maintaining rail-to-rail output swing. Its REF pin accepts an external reference (0.1 V to VDD – 1.7 V) to set zero-differential-output voltage-enabling full-scale bipolar signal handling (±20 mV input for G = 100) from a single 2.85 V to 5.25 V supply.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain | Fixed 100 V/V - eliminates external resistor network, reduces layout sensitivity and thermal drift in precision gain stages. |
| Input Offset Voltage | ±100 µV (typ) - enables accurate amplification of sub-millivolt differential signals without nulling circuitry. |
| Gain-Bandwidth Product | 2.5 MHz - supports stable 25 kHz –3dB bandwidth at G = 100, suitable for dynamic sensor signals up to audio frequencies. |
| Input Bias Current | 1 pA (typ) - preserves signal integrity in high-impedance transducer interfaces (e.g., piezoresistive bridges, pH electrodes). |
| Supply Current | 700 µA (typ at 5 V) - enables multi-year operation in coin-cell–powered portable diagnostics equipment. |
| Common-Mode Rejection | 120 dB (typ at DC) - rejects noise from shared ground paths in industrial 4–20 mA loop receivers and motor-drive current sensing. |
| Input Noise Density | 18 nV/√Hz (at 10 kHz) - maintains >80 dB SNR for 100 µV–range biomedical signals digitized by 16-bit ADCs. |
Pinout & Package
MAX4462HETT+T is housed in a 6-pin TDFN-EP (3 mm × 3 mm, 0.75 mm height) with exposed paddle connected to VSS for thermal and EMI performance. Pin 1 is OUT; Pin 2 is VSS; Pin 3 is IN+; Pin 4 is IN−; Pin 5 is VDD; Pin 6 is REF.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OUT) | Amplified output node | Rail-to-rail capable; drives 100 kΩ load to within 4 mV of rails; requires no external pull-up/down in most sensor interface configurations. |
| 2 (VSS) | Negative supply terminal | Ground reference for single-supply operation; exposed paddle must be soldered to PCB ground plane for thermal stability and PSRR optimization. |
| 3 (IN+) | Positive differential input | High-impedance MOS gate (2 GΩ); accepts signals down to –0.1 V relative to VSS-supports low-side current sensing with shunt below ground. |
| 4 (IN−) | Negative differential input | Matched to IN+; enables true differential measurement with CMRR > 80 dB up to 100 kHz. |
| 5 (VDD) | Positive supply terminal | Operates from 2.85 V to 5.25 V; internal regulation ensures stable bias under supply ripple up to 100 mVPP. |
| 6 (REF) | Output reference level input | Sets zero-differential-output voltage; connects to external low-impedance source (e.g., resistor divider, precision VREF IC); determines bipolar output swing center point. |
Key Features
| Feature | Design Value |
|---|---|
| Bipolar operation via REF pin | Enables ±20 mV input range at G = 100 with single 3.3 V supply-eliminates need for dual supplies in portable ECG front-ends. |
| 1 pA typical input bias current | Prevents loading errors in >10 MΩ source impedances (e.g., thermopile outputs, capacitive humidity sensors). |
| ±0.1% factory-trimmed gain accuracy | Reduces post-calibration effort in production test; supports <0.5% total system gain error without trimming. |
| Rail-to-rail output swing | Delivers >99% of available dynamic range to ADCs-maximizes ENOB in 12–16 bit data acquisition systems. |
| 2.5 MHz GBWP at G = 100 | Supports fast-settling (<250 µs to 0.1%) step responses required in closed-loop pressure control and active filter applications. |
Applications
| Strain-Gauge Amplifier | Precision Low-Side Current Sense |
|---|---|
Use Scenario: Amplifying mV-level Wheatstone bridge output from load cell in industrial weighing system operating from 3.3 V rail. IC Role / Device Role / Timing Role: Instrumentation amplifier providing fixed 100× gain, REF tied to 1.65 V for symmetric ±165 mV output swing. Use Value: 100 µV offset and 120 dB CMRR reject bridge excitation noise and ground bounce, enabling <0.05% linearity over temperature. | Use Scenario: Measuring bidirectional motor phase current in battery-powered BLDC drive using shunt resistor below ground. IC Role / Device Role / Timing Role: Ground-sensing IA with REF = 0 V, configured for bipolar output to resolve ±50 mV shunt voltage at G = 100. Use Value: Input common-mode range extends to –0.1 V allows direct connection to shunt; 1 pA bias current prevents offset shift due to trace leakage. |
| Low-Noise Microphone Preamplifier | Battery-Powered Medical Equipment |
Use Scenario: Condenser microphone bias and signal conditioning in portable hearing aid with 3 V coin cell. IC Role / Device Role / Timing Role: Single-supply IA with REF = 1.5 V, amplifying ±10 mV AC-coupled mic signal to full-scale 1.5 VPP output. Use Value: 18 nV/√Hz input noise preserves SNR > 65 dB across 20 Hz–20 kHz; 700 µA quiescent current extends battery life beyond 100 hours. | Use Scenario: Front-end amplification of ECG differential leads in handheld diagnostic device powered by Li-ion cell (3.0–4.2 V). IC Role / Device Role / Timing Role: Bipolar IA with REF = VDD/2, accepting ±5 mV biopotential signals and delivering rail-to-rail output to 16-bit SAR ADC. Use Value: 100 µV offset and ±0.1% gain error ensure <1 µV baseline drift and <0.2% amplitude error-meeting AHA clinical accuracy requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar instrumentation amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| INA128UA/2K5 | Three-op-amp topology; 125 µV max offset; 1200 µA supply current; no REF pin; requires external gain resistors. | Unipolar output only; less suited for true bipolar signal chains without level-shifting circuitry. | Choose when legacy design reuse or higher CMRR (>130 dB) at low frequency is prioritized over power and board space. |
| AD8421ARMZ | Current-feedback IA; 35 µV max offset; 1000 µA supply current; REF pin present; 10 MHz GBWP; SOIC-8 package. | Higher bandwidth and lower offset, but larger footprint and higher cost; requires careful layout for RF immunity. | Choose for high-speed industrial DAQ requiring >100 kHz bandwidth and sub-50 µV offset, where TDFN size is not critical. |
Compared with INA128UA/2K5 and AD8421ARMZ, the MAX4462HETT+T delivers optimal trade-off of ultra-low power (700 µA), miniature TDFN packaging, factory-trimmed 100× gain, and integrated REF-based bipolar operation-making it uniquely suited for space- and energy-constrained portable medical and industrial sensor nodes.
Availability
MAX4462HETT+T is available at Aetrix Electronics and suitable for industrial process control, precision low-side current sense, and battery-powered medical equipment requiring stable component supply across extended temperature ranges (–40°C to +85°C) and long production lifecycles.
Supply support for MAX4462HETT+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) designs high-performance analog and mixed-signal ICs for demanding industrial, medical, and communications applications.
The MAX4462HETT+T belongs to Maxim's precision instrumentation amplifier product line, engineered specifically for low-power, single-supply sensor signal conditioning with bipolar capability-targeting portable diagnostics, smart transducers, and compact industrial I/O modules.
FAQ
What is the function of the REF pin on the MAX4462HETT+T?
The REF pin on the MAX4462HETT+T sets the output voltage for zero differential input, enabling true bipolar operation from a single supply. When a reference voltage (e.g., VDD/2 = 1.65 V) is applied to REF, the output centers at that voltage-allowing ±20 mV input signals to produce symmetrical output swings. This eliminates the need for level-shifting circuitry in portable ECG or strain-gauge applications.
Does the MAX4462HETT+T support dual-supply operation?
Yes, the MAX4462HETT+T supports dual-supply operation with VDD up to +2.6 V and VSS down to –2.6 V. In this configuration, REF should be connected to ground to establish a 0 V output center point. The input common-mode range extends from VSS – 0.1 V to VDD – 1.7 V, and the REF input range remains 0.1 V above VSS to 1.7 V below VDD-ensuring full functionality in split-rail systems.
What is the maximum capacitive load the MAX4462HETT+T can drive without instability?
The MAX4462HETT+T is stable driving up to 100 pF capacitive load, as verified in the datasheet's Electrical Characteristics table. Exceeding this value may cause sustained oscillations or degraded settling time. For loads >100 pF (e.g., long PCB traces or ADC input capacitance), a series isolation resistor (10–100 Ω) between OUT and the load is recommended to maintain phase margin and preserve 0.1% settling within 250 µs.
How does the MAX4462HETT+T achieve 1 pA input bias current?
The MAX4462HETT+T achieves 1 pA typical input bias current through its CMOS-input transconductance stage, where IN+ and IN− connect directly to MOSFET gates with negligible leakage. This architecture avoids the base-current errors of bipolar-input IAs and enables accurate amplification of signals from ultra-high-impedance sources such as piezoelectric sensors and electrochemical cells-without requiring guard rings or active bias cancellation.
Is the MAX4462HETT+T pin-compatible with other devices in the MAX446x family?
No-the MAX4462HETT+T is not pin-compatible with MAX4460 or MAX4461 variants. While all share the same 6-pin TDFN-EP footprint, pin functions differ: MAX4462 uses Pin 2 as VSS and Pin 6 as REF, whereas MAX4461 uses Pin 2 as GND and Pin 6 as SHDN, and MAX4460 uses Pin 2 as GND and Pin 6 as FB. Swapping packages without redesigning the PCB will result in incorrect biasing or nonfunctional operation.
MAX4462HETT+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 6-WDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- Instrumentation
- Number of Circuits:
- 1
- Output Type:
- Rail-to-Rail
- Slew Rate:
- 0.25V/µs
- Gain Bandwidth Product:
- 2.5 MHz
- -3db Bandwidth:
- 25 kHz
- Current - Input Bias:
- 1 pA
- Voltage - Input Offset:
- 100 µV
- Current - Supply:
- 800µA
- Current - Output / Channel:
- 150 mA
- Voltage - Supply Span (Min):
- 2.85 V
- Voltage - Supply Span (Max):
- 5.25 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 6-TDFN (3x3)
MAX4462HETT+T FAQ
1.How can I place an order for MAX4462HETT+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX4462HETT+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 MAX4462HETT+T reliable?
The price and inventory of MAX4462HETT+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX4462HETT+T is usually 5 days.
3.What payment methods are accepted for MAX4462HETT+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX4462HETT+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX4462HETT+T?
MAX4462HETT+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX4462HETT+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 MAX4462HETT+T?
For technical support, including MAX4462HETT+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX4462HETT+T requirements.
6.How does Aetrix verify that MAX4462HETT+T is sourced from the original manufacturer or authorized distributors?
All MAX4462HETT+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 MAX4462HETT+T meets industry standards.
7.What is the process for return or replacement of MAX4462HETT+T?
All MAX4462HETT+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX4462HETT+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 MAX4462HETT+T part is unused and in its original packaging.
Return procedure for MAX4462HETT+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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