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℃.
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
High Accuracy Optical Power Measurement
Wide Range Baseband Log Data Compression
Versatile Detector for Automatic Power Control Loops
Part Number | Status | Package | Pins | Pd-Free | RoHS | REACH | Green | MSL Rating | Operating Temperature Range | Material Content | Reliability Report | Unit Resale Price* (Volume Range: in USD) | Lead Time** (Volume Range: Days) | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
SGM834BYTS14G/TR | Active | TSSOP-14 | 14 | Yes | Yes | Yes | Yes | MSL3 | -40℃ to +85℃ | View | View | 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 |
* The unit resale price is for reference purposes only. Please contact our distributors for a formal quotation.
** The lead time provided is for reference purposes only and is subject to change based on different circumstances.
