DS3920T-001+【PDF 6/7 页】IC CURRENT MIRROR 5:1 SOT23-6

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DS3920

Fast Current Mirror

Maxim Integrated

Detailed Description

The DS3920 provides a fast, precision current mirror for

photodiode-monitoring applications. The current mirror

is accurate across a large dynamic range. The mirror

response time is fast enough to comply with GPON Rx

burst-mode monitoring requirements. The device has a

built-in current limiting feature to protect photodiodes

from large signal inputs, and an included thermal shut-

down. A diode is provided to limit the voltage at the MIR

output.

Current Mirror

The mirror output is typically connected to an analog-

to-digital converter (ADC) using a resistor to convert the

mirrored current into a voltage. The resistor to ground

should be selected so that the ADCs full-scale voltage is

reached when the maximum mirrored current is reached.

For example, given that the maximum monitored current

through the APD is 2mA, 1.25V ADC full scale, and a 5:1

mirror ratio, the correct resistor is approximately 3.2kI.

The mirror response time is dominated by the amount of

capacitance placed on the output.

Current Clamp

The device features a current clamping circuit to protect

the photodiode by limiting the amount of current from

MIROUT to no more than I

MIROUT

. See the Ordering

Information for available current clamp options.

Diode Protection

A diode is internally connected from the MIR to DIODE

pins. This enables an external voltage applied to DIODE

to limit the voltage on MIR. The voltage applied to DIODE

should be equal to the desired V

MIR

limit minus the diode

forward voltage drop, or V

MIR

- V

Thermal Shutdown

As a safety feature, the device has a thermal shutdown

circuit that turns off the MIROUT and MIR currents when

the internal die temperature exceeds T

SHDN

. The thermal

shutdown mechanism has a built-in hysteresis of T

HYST

Thus, the MIROUT and MIR currents resume once the

device has cooled to T

SHDN

- T

HYST

Ordering Information

+Denotes a lead(Pb)-free/RoHS-compliant package.

T = Tape and reel.

Package Information

For the latest package outline information and land patterns (footprints), go to www.maximintegrated.com/packages. Note that a

+, #, or - in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the

drawing pertains to the package regardless of RoHS status.

PART

TEMP RANGE

TYP CURRENT LIMIT (mA)

PIN-PACKAGE

DS3920T-001+

-40NC to +85NC

6 SOT23

DS3920T-001+T

-40NC to +85NC

6 SOT23

DS3920T-002+

-40NC to +85NC

4.4

6 SOT23

DS3920T-002+T

-40NC to +85NC

4.4

6 SOT23

PACKAGE TYPE

PACKAGE CODE

OUTLINE NO.

LAND PATTERN NO.

6 SOT23

U6SN+1

21-0058

90-0175

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