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MAX4206
Precision Transimpedance Logarithmic Amplifier with Over 5 Decades of Dynamic Range
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The MAX4206 logarithmic amplifier computes the log ratio of an input current relative to a reference current (externally or internally generated) and provides a corresponding voltage output with a default 0.25V/decade scale factor. The device operates from a single +2.7V to +11V supply or from dual ±2.7V to ±5.5V supplies and is capable of measuring five decades of input current across a 10nA to 1mA range.
The MAX4206's uncommitted op amp can be used for a variety of functions, including filtering noise, adding offset, and adding additional gain. A 0.5V reference is also included to generate an optional precision current reference using an external resistor, which adjusts the log intercept of the MAX4206. The output-offset voltage and the adjustable scale factor are also set using external resistors.
The MAX4206 is available in a space-saving 16-pin thin QFN package (4mm x 4mm x 0.8mm), and is specified for operation over the -40°C to +85°C extended temperature range.
The MAX4206's uncommitted op amp can be used for a variety of functions, including filtering noise, adding offset, and adding additional gain. A 0.5V reference is also included to generate an optional precision current reference using an external resistor, which adjusts the log intercept of the MAX4206. The output-offset voltage and the adjustable scale factor are also set using external resistors.
The MAX4206 is available in a space-saving 16-pin thin QFN package (4mm x 4mm x 0.8mm), and is specified for operation over the -40°C to +85°C extended temperature range.
Key Features
- Single Supply Capability Reduces System Power Supply Requirements
- +2.7V to +11V Single-Supply Operation
- Also Supports ±2.7V to ±5.5V Dual-Supply Operation if Required
- Wide Dynamic Range Supports Most Photodiode Current Measurement Applications
- 5 Decades of Dynamic Range (10nA to 1mA)
- Monotonic Over a 1nA to 1mA Range
- Adjustable Output Scale Factor
- 0.25V/Decade Internally Trimmed Output Scale Factor
- Adjustable Output Offset Voltage
- Internal 10nA to 10µA Reference Current Source
- 0.5V Input Common-Mode Voltage
- Small Package and Few External Components Saves Space and Simplifies Design-In
- 16-Pin TQFN Package (4mm x 4mm x0.8mm)
Applications/Uses
- Analog Signal Processing
- Medical Instrumentation
- Photodiode Current Monitoring
- Portable Instrumentation
Parametric specs for Logarithmic Amplifiers (Log Amps)
| VSUPPLY (Single) (V) (min) | 2.7 |
| VSUPPLY (Single) (V) (max) | 11 |
| VSUPPLY (Dual) (±V) (min) | 2.7 |
| VSUPPLY (Dual) (±V) (max) | 5.5 |
| ICC (mA) (typ) | 3.9 |
| Log. Slope (mV/ decade) | 250 |
| Dynamic Range (dB) | 100 |
| Package/Pins | TQFN/16 |
| Oper. Temp. (°C) | -40 to +85 |
| Budgetary Price (See Notes) | $1.09 @1k |
Parametric specs for Transimpedance Amplifiers (TIA)
| Target Oper. Range (Gbps) | <1 |
| Data Rate (Mbps) (min) | 0.005 |
| VSUPPLY (V) | 5 |
| ICC (mA) (typ) | 3.9 |
| Input Noise (nA) (max) | 17000 |
| Bandwidth (MHz) (min) | 5 |
| IIN (µA) (max) | 10 |
| Package/Pins | TQFN/16 |
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Technical Docs
| Data Sheet | Precision Transimpedance Logarithmic Amplifier with Over 5 Decades of Dynamic Range | May 19, 2015 | |
| App Note | Integrated DC Logarithmic Amplifiers |
Click any title below to view the detail page where available.
Description
The MAX4206 evaluation kit (EV kit) is a fully assembled and tested surface-mount circuit board that demonstrates the MAX4206 logarithmic amplifier. The MAX4206 computes the log ratio of an input current relative to a reference current and provides a corresponding voltage output with a default 0.25V/decade scale factor. The EV kit operates from a single +2.7V to +11V supply or from dual ±2.7V to ±5.5V supplies, with the ability to select one of four reference currents.
The MAX4206 EV kit can be used to evaluate the MAX4207 by changing the IC and the input RC networks R1, R2, C7, and C8.
Features
- +2.7V to +11V Single-Supply Operation or ±2.7V to ±5.5V Dual-Supply Operation
- Selectable 10nA/100nA/1µA/10µA On-Board Reference Current
- Adjustable Output Scale Factor
- Surface-Mount Construction
- Fully Assembled and Tested
/en/design/design-tools/ee-sim.html?
 | SIMULATION MODELS MAX4206 Orcad Library | Download |
| SIMULATION MODELS MAX4206 Macromodel | Download |
Support & Training
Search our knowledge base for answers to your technical questions.
Filtered SearchOur dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal.
Parameters
Parametric specs for Logarithmic Amplifiers (Log Amps)
| VSUPPLY (Single) (V) (min) | 2.7 |
| VSUPPLY (Single) (V) (max) | 11 |
| VSUPPLY (Dual) (±V) (min) | 2.7 |
| VSUPPLY (Dual) (±V) (max) | 5.5 |
| ICC (mA) (typ) | 3.9 |
| Log. Slope (mV/ decade) | 250 |
| Dynamic Range (dB) | 100 |
| Package/Pins | TQFN/16 |
| Oper. Temp. (°C) | -40 to +85 |
| Budgetary Price (See Notes) | $1.09 @1k |
Parametric specs for Transimpedance Amplifiers (TIA)
| Target Oper. Range (Gbps) | <1 |
| Data Rate (Mbps) (min) | 0.005 |
| VSUPPLY (V) | 5 |
| ICC (mA) (typ) | 3.9 |
| Input Noise (nA) (max) | 17000 |
| Bandwidth (MHz) (min) | 5 |
| IIN (µA) (max) | 10 |
| Package/Pins | TQFN/16 |
Key Features
- Single Supply Capability Reduces System Power Supply Requirements
- +2.7V to +11V Single-Supply Operation
- Also Supports ±2.7V to ±5.5V Dual-Supply Operation if Required
- Wide Dynamic Range Supports Most Photodiode Current Measurement Applications
- 5 Decades of Dynamic Range (10nA to 1mA)
- Monotonic Over a 1nA to 1mA Range
- Adjustable Output Scale Factor
- 0.25V/Decade Internally Trimmed Output Scale Factor
- Adjustable Output Offset Voltage
- Internal 10nA to 10µA Reference Current Source
- 0.5V Input Common-Mode Voltage
- Small Package and Few External Components Saves Space and Simplifies Design-In
- 16-Pin TQFN Package (4mm x 4mm x0.8mm)
Applications/Uses
- Analog Signal Processing
- Medical Instrumentation
- Photodiode Current Monitoring
- Portable Instrumentation
Description
The MAX4206 logarithmic amplifier computes the log ratio of an input current relative to a reference current (externally or internally generated) and provides a corresponding voltage output with a default 0.25V/decade scale factor. The device operates from a single +2.7V to +11V supply or from dual ±2.7V to ±5.5V supplies and is capable of measuring five decades of input current across a 10nA to 1mA range.
The MAX4206's uncommitted op amp can be used for a variety of functions, including filtering noise, adding offset, and adding additional gain. A 0.5V reference is also included to generate an optional precision current reference using an external resistor, which adjusts the log intercept of the MAX4206. The output-offset voltage and the adjustable scale factor are also set using external resistors.
The MAX4206 is available in a space-saving 16-pin thin QFN package (4mm x 4mm x 0.8mm), and is specified for operation over the -40°C to +85°C extended temperature range.
The MAX4206's uncommitted op amp can be used for a variety of functions, including filtering noise, adding offset, and adding additional gain. A 0.5V reference is also included to generate an optional precision current reference using an external resistor, which adjusts the log intercept of the MAX4206. The output-offset voltage and the adjustable scale factor are also set using external resistors.
The MAX4206 is available in a space-saving 16-pin thin QFN package (4mm x 4mm x 0.8mm), and is specified for operation over the -40°C to +85°C extended temperature range.
Technical Docs
| Data Sheet | Precision Transimpedance Logarithmic Amplifier with Over 5 Decades of Dynamic Range | May 19, 2015 | |
| App Note | Integrated DC Logarithmic Amplifiers |
Support & Training
Search our knowledge base for answers to your technical questions.
Filtered SearchOur dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal.
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