ADR370ART-REEL7 datasheet(8/12 Pages) AD

部件名	ADR370ART-REEL7

功能描述	Precision Low Power 2.048 V SOT-23 Voltage Reference

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制造商	AD [Analog Devices]

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REV. A

–8–

ADR370

12-Bit Precision Programmable Current Source

By replacing the potentiometer in Figure 6 with a 12-bit precision

DAC like the AD5322, a higher precision programmable current

source can be achieved. Figure 7 illustrates the implementation

of this circuit. The load current can be determined with the

following equation.

I

VD

R

L

REF

SET

=

−

()

×

1

4096

(6)

The compliance voltage should be kept low so that the supply

voltage to U2, between VDD and GND, does not fall below 2.5 V.

VIN

U1

U2

+5V

V+

V–

1

11

U3

2

3

VREF (1 – D2/N)

+5V

OP1177

AD5322

–5V

ADR370

VOUT

GND

+5V

VL

RL

RSET

TOL

±0.05%

IL

VIN

VDD

VO

GND

Figure 7. 12-Bit Programmable Current Source

Precision Boosted Output Regulator

A precision voltage output with boosted current can be realized

with the circuit shown in Figure 8. In this circuit, VO is maintained

by the ADR370 at 2.048 V.

The ADR370 sources a maximum of 5 mA if the load current,

IL, is more than 5 mA, current is furnished by the transistor, Q1,

and the input voltage supply VDD.

VIN

R1

10k

RL

IL

ADR370

VOUT

GND

VDD

Q1

2N3906

4V TO 12V

Figure 8. Precision Boosted Output Regulator

Q1 will be turned on to regulate current as needed. R1 is required

to bias the base of Q1 and must be large enough to comply with

the supply current requirements of the ADR370. The supply

voltage can be as low as 4 V.

The maximum current output of this circuit is limited by the

power dissipation of the bipolar transistor, Q1.

PV

I

DISS

DD

L

=−

()×

2 048

.

(7)

Using the 2N3906 PNP transistor shown in Figure 8 and a 4 V

power supply, RL should be chosen so that a maximum of 100 mA

is drawn from the circuit, which limits the power dissipation of

Q1 to ~200 mW.

类似零件编号 - ADR370ART-REEL7

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MIC GROUP RECTIFIERS	ADR30L	27Kb / 1P	DISH AVALANCHE AUTOMOTIVE RECTIFIER
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Analog Devices	ADR318	492Kb / 8P	Precision Low Drift SOT-23 Voltage Reference with Shutdown REV. 0
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类似说明 - ADR370ART-REEL7

制造商	部件名	数据表	功能描述
Analog Devices	ADR381	246Kb / 16P	Precision Low Drift 2.048 V/2.500 V SOT-23 Voltage Reference REV. C
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National Semiconductor ...	LM4132	863Kb / 15P	SOT-23 Precision Low Dropout Voltage Reference
Texas Instruments	LM4132_016	784Kb / 36P	[Old version datasheet] SOT-23 Precision Low Dropout Voltage Reference
National Semiconductor ...	LM4132	1Mb / 20P	SOT-23 Precision Low Dropout Voltage Reference
Texas Instruments	LM4132	1Mb / 38P	[Old version datasheet] LM4132 SOT-23 Precision Low Dropout Voltage Reference
Analog Devices	ADR318	484Kb / 12P	Precision Low Drift SOT-23 Voltage Reference with Shutdown REV. A