DC2432A Datasheet DC2432A | P1-P3

dc2432af

DEMO MANUAL DC2432A

DESCRIPTION

LT6658

Precision Dual Output, High Current,

Low Noise, Voltage Reference

Demonstration circuit 2432A features the LT

6658, a

precision 2.5V dual output reference that combines the

performance of a low drift low noise reference and a linear

regulator. Both outputs are ideal for driving the precision

reference inputs of high resolution ADCs and DACs, even

with heavy loading while simultaneously acting as output

supplies for powering microcontrollers and other sup-

porting devices. Both outputs have the same precision

specifications and track each other over temperature.

Both outputs are nominally 2.5V; however, each can be

L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear

Technology Corporation. All other trademarks are the property of their respective owners.

PERFORMANCE SUMMARY

LT6658 BLOCK DIAGRAM

configured with external resistors to give an output volt-

age up to 6V.

Using Kelvin connections, the LT6658 typically has

0.1ppm/mA load regulation with up to 150mA load

current. A noise reduction pin is available to band-limit

and lower the total integrated noise.

Design files for this circuit board are available at

http://www.linear.com/demo/DC2432A

Specifications are at T

= 25°C

SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS

Input Supply Range 5V 36 V

OUT

Output Voltage Accuracy –0.05 +0.05 %

Temperature Drift 10 ppm

Supply Current 2 mA

Load Regulation OUT1 0mA to 150mA 1 ppm/mA

Load Regulation OUT2 0mA to 50mA 1.5 ppm/mA

800Ω

400Ω

THERMAL

SHUTDOWN

DNC

GND

IN2

IN1

OUT2_F

OUT1_F

OUT2_S

OUT1_S

BYPASS

6658 BD

BANDGAP

dc2432af

DEMO MANUAL DC2432A

QUICK START PROCEDURE

With the demonstration circuit, it is easy to set up and

evaluate the performance of the LT6658. Refer to Figure1

for proper measurement equipment setup and follow the

procedure below.

1. With the power off, connect the power supply positive

to V

and the common to GND. With default settings,

the supply can range from V

OUT

+ 2.5V to 36V.

2. Connect a DVM to the V

OUT

turret OUT1 with the com-

mon connection attached to ground.

3. Turn on power supply and confirm reference operation

on OUT1, and also OUT2.

JUMPER SUMMARY

JP1: V

Input Selection. This jumper has 3 positions:

1. SEP: Separates the V

from the V

IN1

and V

IN2

output

buffer supplies

2. COM/V2 : Shorts the V

IN2

output buffer supply pin to V

3. COM/V1: Shorts the V

IN1

output buffer supply pin to V

JP2: V

IN1

IN2

Output Buffer Supply Connection:

1. SEP: Separates the V

IN1

and V

IN2

output buffer supply

2. COM: Shorts the V

IN1

and V

IN2

output buffer supplies

Figure 1: Test Setup

dc2432af

DEMO MANUAL DC2432A

Information furnished by Linear Technology Corporation is believed to be accurate and reliable.

However, no responsibility is assumed for its use. Linear Technology Corporation makes no representa-

tion that the interconnection of its circuits as described herein will not infringe on existing patent rights.

JP3: OD Output Disable:

1. ENA: Enables the outputs

2. DIS/EXT: Disables the outputs or allows the OD pin to

be driven externally.

JP4: Noise Reduction Select:

1. LF: 10μF

2. NF: Optional cap

3. HF: 0.1μF

JP5: OUT1 Select:

1. Fixed: OUT1 sense line is shorted to OUT1 Force and

the output is fixed.

2. ADJ: OUT1 sense line is separated from OUT1 Force

allowing for resistors R1 and R2 to be installed and

programming the OUT1 voltage to a different value.

JP6: OUT2 Select:

1. Fixed: OUT2 sense line is shorted to OUT2 Force and

the output is fixed.

2. ADJ: OUT2 sense line is separated from OUT2 Force

allowing for resistors R4 and R5 to be installed and

programming the OUT2 voltage to a different value.

QUICK START PROCEDURE

OPTIONAL SETTINGS

1. Programming the Output Voltage

By separating the V

OUT_S

line from the V

OUT_F

and

using 2resistors to create a divider in the feedback of

the output amplifier, the reference output can be pro-

grammed from 2.5V to 6V. The output voltage range

is limited on the high side due to internal ESD clamps

that protect the pins when the voltage goes above 6V.

The output voltage can be set using the equation:

OUT

= V

REF

• (R1 + R2)/R2 with V

REF

= 2.5V

The resistors will affect the temperature drift and

accuracy of the LT6658 output, so care should be

given when choosing resistors. It is crucial that the

resistor ratio stay consistent over temperature to

guarantee the best reference performance.

2. Setting the Noise Reduction

The noise reduction pin can be used to filter the reference

output. The demo board comes with two pre-installed

capacitors that can be selected with the NR jumper. The

effects of the different capacitors are shown in Figure2.

Figure 2

= 0µF

= 1µF

= 10µF

FREQUENCY (kHz)

0.01

0.1

100

1000

100

150

200

250

NOISE (nV/√

)

dc2432a F02

P1-P3 P4-P4

DC2432A

Mfr. #:

Buy DC2432A

Manufacturer:

Analog Devices Inc.

Description:

Power Management IC Development Tools LT6658 Demoboard -Low Noise, High Curren

Lifecycle:

New from this manufacturer.

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