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Analog Devices Inc./Maxim Integrated MAX4206ETE+
- Part No.:
- MAX4206ETE+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 16-WQFN Exposed Pad
- Datasheet:
-
MAX4206ETE+.pdf
- Description:
- IC LOGARITHMIC 1 CIRCUIT 16TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:594
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Product details
Overview
MAX4206ETE+ from Maxim Integrated is a precision transimpedance logarithmic amplifier that computes the log ratio of input current (LOGIIN) to reference current (REFIIN) and delivers a voltage output with a default 0.25V/decade scale factor. It operates from single +2.7V to +11V or dual ±2.7V to ±5.5V supplies, supports 10nA–1mA input current range across >5 decades, and is used in photodiode current monitoring for optical absorbance measurement.
For engineers reviewing the MAX4206ETE+ datasheet, MAX4206ETE+ pinout, MAX4206ETE+ application, or MAX4206ETE+ equivalent, this page provides verified circuit role (log-ratio current-to-voltage converter), confirmed dynamic range (5 decades), validated supply flexibility (single/dual), precise scale factor (0.25V/decade), and real-world use in portable medical instrumentation requiring stable low-current logarithmic response.
Technical Context
The MAX4206ETE+ implements a matched bipolar transistor pair architecture with on-chip temperature compensation to stabilize the thermal voltage (kT/q) dependency, enabling <±10mV log conformity error over –40°C to +85°C. Its dual-output structure separates fixed-scale LOGV1 (0.25V/decade) from adjustable-scale LOGV2, where external resistors set gain and offset independently.
It integrates a 0.5V common-mode voltage reference (CMVOUT), a 1.238V precision voltage reference (REFVOUT), and an adjustable current reference (REFIOUT, 10nA–10µA via REFISET), all supporting biasing and calibration without external components. The uncommitted op-amp buffer (LOGV2) enables post-log filtering, offset addition, and programmable scaling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logarithmic Scale Factor | 0.25 V/decade (internally trimmed, ±5.5% over temp); sets output voltage change per decade of ILOG/IREF ratio |
| Input Current Range | 10 nA to 1 mA (5-decade dynamic range); enables detection from weak photodiode signals to high-intensity optical inputs |
| Log Conformity Error | ±10 mV (over –40°C to +85°C); defines maximum deviation from ideal log transfer curve at full operating range |
| Supply Voltage Range | +2.7V to +11V (single) or ±2.7V to ±5.5V (dual); supports battery-powered portables and rail-to-rail industrial systems |
| Common-Mode Input Range | 0.5 V to 1.0 V (CMVIN); allows flexible biasing for single/dual supply operation and photodiode anode/cathode configurations |
| Reference Voltage Output | 1.238 V (REFVOUT, ±20 mV over temp); provides stable excitation for external RSET to generate precision reference currents |
| Output Noise Density | 0.8 µV/√Hz at 5 kHz (LOGV2); ensures low-noise signal conditioning for high-resolution optical measurements |
Pinout & Package
The MAX4206ETE+ is housed in a 16-pin TQFN-EP package (4mm × 4mm × 0.8mm) with exposed pad for thermal performance and EMI reduction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 9 | N.C. | No internal connection; must be left floating or tied to GND for mechanical stability |
| 2 | REFVOUT | 1.238V precision voltage reference output; bypass with 0–1µF capacitor to reduce noise and improve PSRR |
| 3 | GND | Analog ground reference; connects to system ground plane and serves as return for REFVOUT, CMVOUT, and REFISET |
| 4 | VEE | Negative supply rail; tied to GND in single-supply mode; requires 0.1µF local decoupling |
| 5 | LOGV1 | Primary logarithmic output (0.25V/decade); directly usable for calibrated optical power measurement |
| 6 | OSADJ | Offset adjust input; accepts current to shift LOGV1 baseline voltage in single-supply configurations |
| 7 | SCALE | Scale factor control node for LOGV2; forms resistive divider to set gain ≥0.25V/decade |
| 8 | LOGV2 | Secondary logarithmic output with user-adjustable scale; used for gain extension or differential processing |
| 10 | VCC | Positive supply rail; supports 2.7–11V; requires 0.1µF local decoupling to GND |
| 11 | REFISET | Current reference adjustment input; connects to GND via RSET (5kΩ–5MΩ) to program IREF = 0.5V/RSET |
| 12 | CMVOUT | 0.5V common-mode reference output; used to bias CMVIN for optimal transistor operating point |
| 13 | REFIOUT | Programmable current reference output (10nA–10µA); mirrors IREF for external feedback or calibration |
| 14 | REFIIN | Reference current input node; accepts external or internal IREF to define log intercept point |
| 15 | LOGIIN | Main logarithmic current input; connects directly to photodiode anode or transimpedance amplifier output |
| 16 | CMVIN | Common-mode input node; biased by CMVOUT or external 0.5–1.0V source to set collector voltage of logging transistors |
Key Features
| Feature | Design Value |
|---|---|
| Monotonic response over 1nA–1mA | Ensures unambiguous current-to-voltage mapping across extended range without signal inversion or dead zones |
| Adjustable log intercept via REFISET | Enables precise calibration of zero-reference point (e.g., 100nA absorbance baseline) using single external resistor |
| Integrated 0.5V CMVOUT reference | Eliminates need for external bias network when configuring photodiode in photovoltaic mode |
| Internal temperature-compensated kT/q tracking | Maintains scale factor stability (±80 µV/decade/°C drift) without external thermal sensors or lookup tables |
| Low input bias current (0.01–1 nA) | Minimizes loading error on high-impedance photodiode sources and preserves dynamic range at sub-100nA levels |
Applications
| Photodiode Current Monitoring | Portable Instrumentation |
|---|---|
Use Scenario: Real-time optical absorbance measurement in handheld spectrophotometers using reverse-biased silicon photodiodes. IC Role / Device Role / Timing Role: Log-ratio current-to-voltage converter that linearizes photodiode output across 5 decades of light intensity while rejecting supply and temperature drift. Use Value: Enables single-supply, battery-operated designs with <±10mV log conformity error-critical for ppm-level concentration detection. | Use Scenario: Low-power laser power meter in field-deployable test equipment with auto-ranging capability. IC Role / Device Role / Timing Role: Primary analog front-end that converts variable photodiode current into scalable voltage output for ADC digitization. Use Value: Eliminates manual range switching; 10nA–1mA input range covers µW to mW optical power without gain reconfiguration. |
| Medical Instrumentation | Analog Signal Processing |
Use Scenario: Pulse oximetry sensor front-end measuring weak red/IR photodiode currents under motion artifact conditions. IC Role / Device Role / Timing Role: High-precision logarithmic amplifier providing ratiometric output referenced to internal 1.238V and 0.5V references. Use Value: Delivers stable log-conformance (<±5mV at 25°C) despite body-temperature variation and supply ripple. | Use Scenario: Dynamic range compression stage in audio peak detectors or RF power envelope followers. IC Role / Device Role / Timing Role: Transimpedance log amplifier converting detector diode current into compressed voltage for envelope extraction. Use Value: Provides 1MHz small-signal bandwidth (with 32pF/330Ω compensation) and 12V/µs slew rate for fast transient capture. |
Availability
MAX4206ETE+ is available at Aetrix Electronics and suitable for photodiode current monitoring, portable instrumentation, and medical instrumentation requiring stable component supply, long-term production continuity, and guaranteed extended-temperature (-40°C to +85°C) performance.
Supply support for MAX4206ETE+ 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 precision analog, mixed-signal, and power-management ICs for demanding industrial, medical, and communications applications.
The MAX4206ETE+ belongs to Maxim's precision logarithmic amplifier product line, engineered specifically for wide-dynamic-range optical sensing where ratiometric current measurement, temperature-stable scaling, and minimal external components are essential.
FAQ
What is the primary function of the MAX4206ETE+?
The MAX4206ETE+ is a precision transimpedance logarithmic amplifier that computes the logarithmic ratio of input current (LOGIIN) to reference current (REFIIN) and outputs a corresponding voltage with a default 0.25V/decade scale factor. It is designed for high-accuracy optical current measurement across five decades (10nA–1mA), with integrated references and temperature compensation to maintain stability in portable and medical instrumentation. The MAX4206ETE+ enables direct ratiometric conversion without external op-amps or complex calibration.
How does the MAX4206ETE+ achieve temperature-stable logarithmic scaling?
The MAX4206ETE+ uses matched bipolar transistor pairs with on-chip temperature compensation to cancel thermal voltage (kT/q) drift, achieving a log scale factor temperature drift of only ±80 µV/decade/°C over –40°C to +85°C. This design eliminates the need for external thermal sensors or software correction tables. The MAX4206ETE+ maintains its 0.25V/decade nominal slope with <±10mV total log conformity error across the full temperature range, verified in production testing and documented in the DC Electrical Characteristics table.
Can the MAX4206ETE+ operate from a single 3.3V supply?
Yes, the MAX4206ETE+ supports single-supply operation from +2.7V to +11V, including 3.3V. In this configuration, VEE is connected to GND, CMVIN is biased using CMVOUT (0.5V), and ILOG must exceed IREF to ensure positive output polarity at LOGV1. The device draws 7mA typical supply current at 3.3V and maintains full 10nA–1mA input range and ±10mV log conformity. Layout best practices include local 0.1µF decoupling on VCC and grounding the exposed pad for thermal and noise performance.
What is the role of the REFISET pin on the MAX4206ETE+?
The REFISET pin on the MAX4206ETE+ sets the internal reference current (IREF) by connecting an external resistor (RSET) from REFISET to GND. With a fixed 0.5V input at REFISET, IREF = 0.5V / RSET, allowing programmable log intercept tuning from 10nA to 10µA. This enables calibration of the logarithmic zero point-for example, setting IREF = 100nA aligns the 0V output of LOGV1 with 100nA input. The MAX4206ETE+ guarantees REFIOUT accuracy within ±2% over temperature when RSET is selected between 5kΩ and 5MΩ.
Does the MAX4206ETE+ include an internal voltage reference?
Yes, the MAX4206ETE+ integrates two precision internal references: a 1.238V voltage reference (REFVOUT, ±20mV over –40°C to +85°C) and a 0.5V common-mode reference (CMVOUT, ±20mV). REFVOUT powers the REFISET current reference generation and can drive external circuitry with up to 1mA load. CMVOUT provides bias for CMVIN to optimize transistor operating points in both single- and dual-supply modes. Both references are factory-trimmed and characterized-no external components are required for basic operation of the MAX4206ETE+.
MAX4206ETE+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 16-WQFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Amplifier Type:
- Logarithmic
- Number of Circuits:
- 1
- Output Type:
- -
- Slew Rate:
- 12V/µs
- Gain Bandwidth Product:
- 5 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- -
- Voltage - Input Offset:
- 1 mV
- Current - Supply:
- 5mA
- Current - Output / Channel:
- -
- Voltage - Supply Span (Min):
- 2.7 V
- Voltage - Supply Span (Max):
- 11 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-TQFN (4x4)
MAX4206ETE+ FAQ
1.How can I place an order for MAX4206ETE+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX4206ETE+ 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 MAX4206ETE+ reliable?
The price and inventory of MAX4206ETE+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX4206ETE+ is usually 5 days.
3.What payment methods are accepted for MAX4206ETE+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX4206ETE+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX4206ETE+?
MAX4206ETE+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX4206ETE+ 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 MAX4206ETE+?
For technical support, including MAX4206ETE+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX4206ETE+ requirements.
6.How does Aetrix verify that MAX4206ETE+ is sourced from the original manufacturer or authorized distributors?
All MAX4206ETE+ 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 MAX4206ETE+ meets industry standards.
7.What is the process for return or replacement of MAX4206ETE+?
All MAX4206ETE+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX4206ETE+, 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 MAX4206ETE+ part is unused and in its original packaging.
Return procedure for MAX4206ETE+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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