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SGM834B

アクティブ

140dB Range (1nA to 10mA) Logarithmic Current-to-Voltage Converter

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The SGM834B is a single-supply logarithmic current-to-voltage converter for measuring the low frequency current signals over a large range from 1nA to 10mA. With capabilities such as photodiode adaptive biasing, active-shielding (guard driving), output buffer amplifier conditioning and voltage reference on a single chip, this device is optimized for measuring the power of optical signals by using a photodiode operating in the photo current mode. The measured current is converted and compressed to a logarithmic voltage by using transistor I-V characteristics and a compensation circuit.

The SGM834B operates with a single 3V to 5.5V supply and is equipped with a disable input to shut down the device. The input current (IPD) is converted to an internal 40μA/dec logarithmic scaled current that is injected into an internal 5kΩ resistance to provide an output voltage with 10mV/dB (or 200mV/dec) logarithmic slope on the VLOG output pin. This slope can be reduced by an external shunt resistor. The intercept point (the output voltage corresponding to the selected intercept current) and the scale (to change the slope) can be adjusted by the on-chip buffer amplifier.

This device is available in a Green TSSOP-14 package and is specified over a temperature range of -40 to +85.

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特性
  • Patents Pending Proprietary Circuits

  • Seven Full Decades Range

  • 3V to 5.5V Single-Supply Operation

  • Low Power and Temperature Stable

  • Precise Trimmed Scaling

  • 10mV/dB Logarithmic Slope at VLOG Pin

  • 100pA Basic Logarithmic Intercept

  • Simple Slope and Intercept Adjustments

  • 15V/μs Slew Rate

  • 3.3mA (TYP) Quiescent Current (Enabled)

  • 9μA (TYP) Shutdown Current (Disabled)

  • Available in a Green TSSOP-14 Package

アプリケーション

High Accuracy Optical Power Measurement

Wide Range Baseband Log Data Compression

Versatile Detector for Automatic Power Control Loops

注文書
Part Number
StatusPackagePinsPd-Free
RoHS
REACH
Green
MSL RatingOperating Temperature RangeMaterial ContentReliability Report
Unit Resale Price*
(Volume Range: in USD)
Lead Time**
(Volume Range: Days)
SGM834BYTS14G/TR
アクティブ
TSSOP-14
14
Yes
YesYesYesMSL3
-40℃ to +85℃
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1-24 units : $28/unit
25-99 units : $24/unit
100-249 units : $20/unit
250-499 units : $16/unit
500-999 units : $14/unit
1000-9999 units : $10.4/unit
3K-9K : 14 days
10K-99K : 35 days
100K-999K : 70 days
1000K and above : 98 days

* 再販価格は参考価格です。正式な見積もりについては、代理店にお問い合わせください。

** 提供されるリードタイムは参考情報であり、異なる状況に応じて変更される可能性があります。

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