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SGM834B

量产

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

应用

High Accuracy Optical Power Measurement

Wide Range Baseband Log Data Compression

Versatile Detector for Automatic Power Control Loops

订购信息
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
量产
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

* 价格仅供参考。请联系我们的经销商获取正式报价。

** 交货时间仅供参考,可能会根据不同情况而发生变化。

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圣邦微电子 (SGMICRO) 是一家综合性的高性能和高可靠性模拟及混合信号处理和系统电源管理集成电路供应商,为工业自动化、新能源、汽车、通信、计算机、消费电子和医疗设备等应用提供各类模拟信号调理和电源创新解决方案。
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