Datasheet > SGM834B

SGM834B

更新时间： 2024-11-19 11:13:15

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圣邦微 - SGMICRO		/
页数	文件大小	规格书
22页	792K
描述
140dB Range (1nA to 10mA) Logarithmic Current-to-Voltage Converter

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SGM834B 数据手册

SGM834B

140dB Range (1nA to 10mA)

Logarithmic Current-to-Voltage Converter

GENERAL DESCRIPTION

FEATURES

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.

● 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

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 (I_PD) 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.

APPLICATIONS

High Accuracy Optical Power Measurement

Wide Range Baseband Log Data Compression

Versatile Detector for Automatic Power Control Loops

This device is available in a Green TSSOP-14 package

and is specified over a temperature range of -40℃ to

+85℃.

TYPICAL APPLICATION

V_OUT

500mV/dec

V_P

VPS

VOUT

R_A

15kΩ

R_B

VPS

10kΩ

I_PD

VSUM

BFNG

VLOG

BFIN

C_FLT

INPT

200mV/dec

SGM834B

VSUM

VPDB

10nF

VREF

GND

AGND

PWDN

0.1μF

Figure 1. Typical Application Circuit

SG Micro Corp

MARCH2022–REV. A

www.sg-micro.com

12 3 4 5 6 7...22

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