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Analog Devices Inc./Maxim Integrated MAX4207ETE
- Part No.:
- MAX4207ETE
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 16-WQFN Exposed Pad
- Datasheet:
-
MAX4207ETE.pdf
- Description:
- IC LOGARITHMIC 1 CIRCUIT 16TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,937
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Product details
Overview
The MAX4207ETE 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 dual ±2.7V to ±5.5V supplies, supports 5-decade dynamic range (10nA–1mA), features an internal 1.238V reference, adjustable scale/offset, and is used in photodiode current monitoring for optical power measurement.
For engineers reviewing the MAX4207ETE datasheet, MAX4207ETE pinout, MAX4207ETE application, or MAX4207ETE equivalent, key selection criteria include logarithmic conformity error (±10mV), temperature-stable scale factor drift (80µV/decade/°C), dual-supply operation constraints, REFISET-adjustable reference current (10nA–10µA), and thin QFN-16EP package thermal performance.
Technical Context
The MAX4207ETE implements a matched bipolar transistor pair with on-chip temperature compensation to cancel thermal voltage (kT/q) drift, enabling stable -0.25V/decade slope across -40°C to +85°C. Its functional diagram integrates a summing amplifier, current mirror, and dedicated reference generation block (REFVOUT = 1.238V ±20mV).
Two independent logarithmic outputs are provided: LOGV1 (fixed -0.25V/decade, uncommitted op amp not required) and LOGV2 (adjustable scale via SCALE pin resistive divider). Input amplifiers feature summing nodes at ground, supporting photodiode anode connection at LOGIIN and external or internal reference injection at REFIIN.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | ±2.7V to ±5.5V dual supply - enables rail-to-rail input common-mode operation with VCMVIN = 0V to 0.5V |
| Dynamic Range | 10nA to 1mA (5 decades) - supports wide-range photodiode current sensing without range switching |
| Log Conformity Error | ±10mV over full range - ensures <0.5% log-ratio accuracy for absorbance and optical power ratio measurements |
| Scale Factor Temp Drift | 80µV/decade/°C - contributes ≤±0.8mV error over full temperature range, critical for uncalibrated portable instrumentation |
| Reference Voltage | 1.238V ±20mV (REFVOUT) - provides stable bias for precision current reference generation via external RSET |
| Input Offset Voltage | ±5mV max (VLOGIIN − VCMVIN) - sets minimum detectable current difference at low ILOG levels |
| Unity-Gain Bandwidth | 5MHz (LOGV2 buffer) - supports high-speed pulse response (e.g., 10µs settling for 100nA→1µA step) |
Pinout & Package
MAX4207ETE is housed in a 16-pin thin QFN package (4mm × 4mm × 0.8mm) with exposed paddle (internally connected to VEE) for thermal and grounding performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 9 | N.C. | No internal connection - must remain unconnected on PCB |
| 2 | REFVOUT | 1.238V precision reference output - bypass with 0–1µF capacitor to GND for noise reduction |
| 3 | GND | Analog ground reference - connects to system ground plane under exposed paddle |
| 4 | VEE | Negative supply input - bypass to GND with 0.1µF capacitor; exposed paddle tied to this net |
| 5 | LOGV1 | Primary logarithmic output (−0.25V/decade) - directly usable for fixed-scale applications |
| 6 | OSADJ | Offset adjust input - sets LOGV2 output offset via resistive divider from REFVOUT |
| 7 | SCALE | Scale factor control - adjusts LOGV2 gain using resistor divider between SCALE, GND, and LOGV2 |
| 8 | LOGV2 | Secondary logarithmic output - configurable scale/offset for custom transfer functions |
| 10 | VCC | Positive supply input - bypass to GND with 0.1µF capacitor |
| 11 | REFISET | Reference current adjust - sets REFIOUT (10nA–10µA) via external RSET to GND |
| 12 | CMVOUT | 0V common-mode reference - connects to CMVIN to bias LOGIIN/REFIIN inputs at 0V |
| 13 | REFIOUT | Current reference output - delivers precision current derived from REFISET and internal 0.5V source |
| 14 | REFIIN | Reference current input - accepts external or internal reference for log-ratio computation |
| 15 | LOGIIN | Logarithmic input - connects directly to photodiode anode or other current source |
| 16 | CMVIN | Common-mode voltage input - accepts 0–0.5V bias to optimize transistor collector operating point |
Key Features
| Feature | Design Value |
|---|---|
| Internally trimmed -0.25V/decade scale | Eliminates factory calibration for baseline log-ratio accuracy in optical power meters |
| Adjustable LOGV2 scale and offset | Enables custom transfer functions (e.g., +1V/decade) without external op amps |
| Internal 1.238V reference with low noise | Provides <3.3µVRMS 1Hz–10Hz noise for stable RSET-based current references |
| Monotonic operation down to 1nA | Guarantees predictable output polarity and sign for ultra-low-light detection |
| Ground-referenced summing nodes | Simplifies photodiode interfacing - anode connects directly to LOGIIN without level-shifting |
Applications
| Photodiode Current Monitoring | Portable Instrumentation |
|---|---|
Use Scenario: Measuring APD photocurrent in fiber-optic receivers where signal spans 10nA–1mA across dynamic optical link budgets. IC Role / Device Role / Timing Role: Log-ratio amplifier computing log(IAPD/IREF) to convert optical power to linear-in-dB voltage output. Use Value: Enables direct dBm readout with ±0.5dB accuracy over 5 decades without range switching or microcontroller interpolation. | Use Scenario: Battery-powered handheld spectrophotometers requiring low-power, high-accuracy optical absorbance measurement. IC Role / Device Role / Timing Role: Dual-channel logarithmic front-end comparing sample-path and reference-path photodiode currents. Use Value: Delivers <±0.01 OD (optical density) resolution using internal 1.238V reference and monotonic 1nA–1mA operation. |
| Medical Instrumentation | Analog Signal Processing |
Use Scenario: Pulse oximetry sensor front-end measuring weak red/IR photodiode currents under varying skin perfusion. IC Role / Device Role / Timing Role: Precision log-ratio engine rejecting common-mode intensity variations while preserving AC pulse modulation. Use Value: Achieves <1% SpO₂ error by maintaining ±10mV log conformity across -40°C to +85°C ambient shifts. | Use Scenario: Wide-dynamic-range analog compression in test equipment signal chains before ADC digitization. IC Role / Device Role / Timing Role: Hardware-based logarithmic compressor converting 100dB input current range to 1V output swing. Use Value: Reduces ADC dynamic range requirement from 16-bit to 12-bit while preserving SNR in high-precision data acquisition. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar logarithmic amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADL5513ACPZ-R7 | Single-ended 3.3V supply; 0.5V to 3.5V output; no internal reference; 65dB dynamic range (50nA–10mA) | Requires external reference and level-shifting for dual-supply photodiode biasing; optimized for RF power detection | Select when single-supply operation and RF envelope detection (not optical DC current) are primary requirements |
| LT1999HS8#PBF | Dual ±15V supply; discrete transistor log amp; no integrated reference; requires external compensation | Lacks monolithic temperature compensation - ±500µV/°C scale drift vs. MAX4207ETE's 80µV/decade/°C | Select only for legacy industrial systems requiring high-voltage compliance and accepting manual calibration overhead |
Compared with ADL5513ACPZ-R7 and LT1999HS8#PBF, the MAX4207ETE uniquely integrates dual-supply operation, internal 1.238V reference, ground-referenced summing nodes, and factory-trimmed -0.25V/decade slope - reducing BOM count and calibration effort in optical instrumentation.
Availability
MAX4207ETE is available at Aetrix Electronics and suitable for photodiode current monitoring, portable instrumentation, and medical instrumentation requiring stable component supply with guaranteed -40°C to +85°C operation and traceable lot-level qualification.
Supply support for MAX4207ETE 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 and mixed-signal ICs for demanding industrial, medical, and communications applications.
The MAX4207ETE belongs to Maxim's precision logarithmic amplifier product line, engineered specifically for optical power measurement, absorbance spectroscopy, and wide-dynamic-range current sensing where temperature-stable log-ratio accuracy is critical.
FAQ
What is the maximum capacitive load the MAX4207ETE can drive on LOGV1 or LOGV2?
The MAX4207ETE drives capacitive loads up to 50pF on LOGV1 or LOGV2 outputs. Exceeding this value risks instability, ringing, or oscillation due to phase margin degradation. For larger loads, insert a small isolation resistor (e.g., 10–50Ω) in series with the output - though this limits AC bandwidth per RC time constant. The typical operating circuit uses 32pF compensation on LOGIIN/REFIIN, not the outputs.
Can the MAX4207ETE operate from a single supply?
No, the MAX4207ETE requires dual ±2.7V to ±5.5V supplies and cannot operate from a single supply. Its internal architecture relies on symmetric rails to bias the matched transistor pair and maintain logarithmic conformance across the full 10nA–1mA range. Attempting single-supply operation violates absolute maximum ratings and causes undefined behavior or damage.
How is the logarithmic intercept adjusted on the MAX4207ETE?
The logarithmic intercept is adjusted by setting the reference current (IREF) via the REFISET pin. A resistor (RSET) from REFISET to GND generates IREF = 0.5V / RSET, with RSET selected between 5kΩ and 5MΩ to yield IREF from 10nA to 100µA. This shifts the VLOGV1 vs. log(ILOG/IREF) curve horizontally - e.g., RSET = 50kΩ sets IREF = 10µA, moving the 0V output point to ILOG = 10µA.
What is the purpose of the CMVIN and CMVOUT pins on the MAX4207ETE?
CMVOUT provides a 0V common-mode reference output. Connecting CMVOUT to CMVIN biases the collectors of the internal logging and reference transistors at 0V - optimizing linearity and minimizing leakage errors. Alternatively, applying 0–0.5V to CMVIN allows fine-tuning of collector bias for specific photodiode characteristics or low-current operation, improving accuracy below 10nA.
Does the MAX4207ETE require external frequency compensation components?
Yes, the MAX4207ETE requires external RCOMP and CCOMP components at LOGIIN and REFIIN to ensure stability across its full 10nA–1mA input range. Typical values are RCOMP = 330Ω and CCOMP = 32pF. These form a pole-zero network that compensates for bandwidth variation with input current magnitude - omitting them causes peaking, overshoot, or oscillation in pulse response.
MAX4207ETE Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 16-WQFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Obsolete
- Amplifier Type:
- Logarithmic
- Number of Circuits:
- 1
- Output Type:
- -
- Slew Rate:
- 12V/µs
- Gain Bandwidth Product:
- 5 MHz
- -3db Bandwidth:
- 1 MHz
- Current - Input Bias:
- 10 pA
- Voltage - Input Offset:
- 600 µV
- Current - Supply:
- 5mA
- Current - Output / Channel:
- 58 mA
- 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)
MAX4207ETE FAQ
1.How can I place an order for MAX4207ETE through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX4207ETE 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 MAX4207ETE reliable?
The price and inventory of MAX4207ETE are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX4207ETE is usually 5 days.
3.What payment methods are accepted for MAX4207ETE?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX4207ETE transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX4207ETE?
MAX4207ETE orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX4207ETE 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 MAX4207ETE?
For technical support, including MAX4207ETE datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX4207ETE requirements.
6.How does Aetrix verify that MAX4207ETE is sourced from the original manufacturer or authorized distributors?
All MAX4207ETE 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 MAX4207ETE meets industry standards.
7.What is the process for return or replacement of MAX4207ETE?
All MAX4207ETE units undergo pre-shipment inspection (PSI). If there is an issue with MAX4207ETE, 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 MAX4207ETE part is unused and in its original packaging.
Return procedure for MAX4207ETE:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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