Logarithmic Amplifiers

A Iogarithmic amplifier is a type of amplifier- an electronic device that increases the amount of electrical signals. It converts an input current into an output voltage (a flow of electrical current). Typically, the source of this current is a photodiode.

Why are logarithmic amplifiers used?

Logarithmic amplifiers are not only used to create voltage, they're also used to regulate gain (the ratio of two quantities). In the case of a logarithmic amplifier, this is the measurement of the output of a circuit or component in relation to its input.

By using a logarithmic amplifier you can also compress the range of signals in an electronic system because they provide an effective means of dealing with wide dynamic range signals. For example, a system with wide dynamic range may have poor signal-to-noise.

Where are logarithmic amplifiers used?

Logarithmic amplifiers are commonly used in high-speed electronic circuits. Because of their ability to compress signals, they remain a key component in many video, fibre, medical (blood analysis equipment), scientific (material analysers) and wireless systems.


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Description Price Power Supply Type Typical Single Supply Voltage Typical Dual Supply Voltage Maximum Input Offset Voltage Maximum Input Resistance Rail to Rail Output Type Mounting Type Package Type Pin Count Dimensions Height Length Maximum Operating Temperature
RS Stock No. 812-2379
Mfr. Part No.LOG114AIRGVT
SGD15.12
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units
Dual, Single 5 V ±5V 4V - - Differential Surface Mount VQFN 16 4.15 x 4.15 x 0.95mm 0.95mm 4.15mm +70 °C
RS Stock No. 523-7853
Mfr. Part No.AD8313ARMZ
SGD29.27
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units
Single 3 V, 5 V - - 0.001MΩ Rail to Rail Output Rail to Rail Surface Mount MSOP 8 3 x 3 x 0.85mm 0.85mm 3mm +85 °C
RS Stock No. 162-7761
Mfr. Part No.LOG114AIRGVT
SGD17.007
Each (On a Reel of 250)
units
Dual, Single 5 V ±5V 4V - - Differential Surface Mount VQFN 16 4.15 x 4.15 x 0.95mm 0.95mm 4.15mm +70 °C
RS Stock No. 157-8555
Mfr. Part No.AD8309ARUZ
SGD22.32
Each (In a Tube of 96)
units
Single 3 V, 5 V - - 0.001MΩ Rail to Rail Output Differential Surface Mount TSSOP 16 5 x 4.4 x 1 mm, 5 x 4.4 x 1.05 mm 1.05mm 5mm +85 °C
RS Stock No. 100-3852
Mfr. Part No.LOG104AID
SGD21.08
Each (In a Tube of 75)
units
Dual - ±12 V, ±15 V, ±5 V, ±9 V 1.5mV - - - Surface Mount SOIC 8 4.9 x 3.91 x 1.58mm 1.58mm 4.9mm +85 °C
RS Stock No. 912-7472
Mfr. Part No.AD8313ARMZ
SGD25.03
Each (In a Tube of 50)
units
Single 3 V, 5 V - - 0.001MΩ Rail to Rail Output Rail to Rail Surface Mount MSOP 8 3 x 3 x 0.85mm 0.85mm 3mm +85 °C
RS Stock No. 461-8302
Mfr. Part No.LOG104AID
SGD24.19
Each
units
Dual - ±12 V, ±15 V, ±5 V, ±9 V 1.5mV - - - Surface Mount SOIC 8 4.9 x 3.91 x 1.58mm 1.58mm 4.9mm +85 °C
RS Stock No. 523-7724
Mfr. Part No.AD8309ARUZ
SGD27.19
Each
units
Single 3 V, 5 V - - 0.001MΩ Rail to Rail Output Differential Surface Mount TSSOP 16 5 x 4.4 x 1 mm, 5 x 4.4 x 1.05 mm 1.05mm 5mm +85 °C
RS Stock No. 759-1304
Mfr. Part No.AD8307ARZ-RL7
SGD19.80
Each
units
Single 2.7 → 5.5 V - 500µV 1.1kΩ Rail to Rail Output Rail to Rail Surface Mount SOIC 8 5 x 4 x 1.5mm 1.5mm 5mm +85 °C
RS Stock No. 100-3853
Mfr. Part No.LOG112AID
SGD21.299
Each (In a Tube of 50)
units
Dual - ±12 V, ±15 V, ±5 V, ±9 V 1mV - - - Surface Mount SOIC 14 8.65 x 3.91 x 1.58mm 1.58mm 8.65mm +85 °C
RS Stock No. 121-9042
Mfr. Part No.LOG101AID
SGD21.158
Each (In a Tube of 75)
units
Dual - ±12 V, ±15 V, ±5 V, ±9 V 1.5mV - - - Surface Mount SOIC 8 4.9 x 3.91 x 1.58mm 1.58mm 4.9mm +75 °C
New
RS Stock No. 190-4319
Mfr. Part No.MAX4206ETE+
SGD8.806
Each (In a Tube of 75)
units
Dual, Single 2.7 11 V ±2.7 to ±5.5V 5mV - - - Surface Mount TQFN 16 4.1 x 4.1 x 0.75mm 0.75mm 4.1mm +85 °C
RS Stock No. 523-8137
Mfr. Part No.AD8310ARMZ
SGD14.80
Each
units
Single 3 V, 5 V - 1.5mV 0.001MΩ Rail to Rail Input - Surface Mount MSOP 8 3 x 3 x 0.85mm 0.85mm 3mm +85 °C
RS Stock No. 709-6049
Mfr. Part No.AD606JNZ
SGD91.06
Each
units
Single 5 V - - 0.003MΩ - Differential Through Hole PDIP 16 20.07 x 6.35 x 3.3mm 3.3mm 20.07mm +70 °C
RS Stock No. 912-7476
Mfr. Part No.AD8310ARMZ
SGD11.77
Each (In a Tube of 50)
units
Single 3 V, 5 V - 1.5mV 0.001MΩ Rail to Rail Input - Surface Mount MSOP 8 3 x 3 x 0.85mm 0.85mm 3mm +85 °C
RS Stock No. 912-6684
Mfr. Part No.AD8307ANZ
SGD16.28
Each (In a Tube of 50)
units
Single 3 V, 5 V - 0.5mV 0.001MΩ Rail to Rail Output Rail to Rail Through Hole PDIP 8 9.27 x 7.24 x 3.43mm 3.43mm 9.27mm +85 °C
RS Stock No. 111-1182
Mfr. Part No.AD8307ARZ
SGD16.28
Each (In a Tube of 98)
units
Single 3 V, 5 V - 0.5mV 0.001MΩ Rail to Rail Output Rail to Rail Surface Mount SOIC 8 5 x 4 x 1.5mm 1.5mm 5mm +85 °C
RS Stock No. 497-1316
Mfr. Part No.AD8304ARUZ
SGD34.31
Each
units
Single 5 V - 20mV 35MΩ Rail to Rail Output Rail to Rail Surface Mount TSSOP 14 5 x 4.4 x 1mm 1mm 5mm +85 °C
RS Stock No. 709-5389
Mfr. Part No.AD8307ANZ
SGD19.80
Each
units
Single 3 V, 5 V - 0.5mV 0.001MΩ Rail to Rail Output Rail to Rail Through Hole PDIP 8 9.27 x 7.24 x 3.43mm 3.43mm 9.27mm +85 °C
RS Stock No. 912-8882
Mfr. Part No.AD8304ARUZ
SGD29.34
Each (In a Tube of 96)
units
Single 5 V - 20mV 35MΩ Rail to Rail Output Rail to Rail Surface Mount TSSOP 14 5 x 4.4 x 1mm 1mm 5mm +85 °C
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Description:
A precise and versatile integrated circuit that offers easy to use log ratio function. Able to compute the logarithm or log ratio of input current, this device is typically used in optical power meters and optical density measurement.
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