DC2429A Datasheet DC2429A | P1-P3

dc2429af

DEMO MANUAL DC2429A

Description

LT3042

PLL/VCO Supply and

Reference Board

Demonstration Circuit 2429A is a PLL/VCO Supply and

Reference Board that features the LT

3042, an ultralow

noise and ultrahigh PSRR RF linear regulator. When

powered from any lab or wall wart supply, the DC2429A

produces four ultralow noise supplies and an ultralow

noise 100MHz reference that ensures PLL/VCO evaluation

meets data sheet performance.

Functionally, this circuit produces four separate ultralow

noise supplies from a single 6V to 20V supply input.

These supplies provide a fixed 3.3V/800mA supply, a fixed

5V/200mA supply, a variable voltage/200mA supply and a

fixed 3.3V/200mA supply that powers an onboard 100MHz

reference. The variable supply is ideal for powering external

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.

VCOs, by providing a jumper option that selects between

seven common VCO power supply voltages.

The onboard 100MHz reference is capable of providing a

signal which is clean enough to produce data sheet per

formance from a PLL/VCO. The default reference output

mates directly

with the LTC

6945, LTC6946, LTC6947 and

LTC6948 demo board reference inputs. For evaluation of

PLL/VCOs with other references, the DC2429A can be

modified to accommodate different onboard reference

frequencies, signal types and package footprints.

Design files for this circuit board are available at

http://www.linear.com/demo/DC2429A

Figure 1. DC2429A Connections

OUTPUT SUPPLY

3.3V, 800mA

BANANA JACK OR TURRET

SUPPLY OPTIONS

ON/OFF CONTROL VIA JP1, JP2, JP3, JP4

REFERENCE OPTIONS

SUPPORTS A VARIETY OF FOOTPRINTS (U7),

FREQUENCIES AND SE/DIFF OUTPUT TYPES

INPUT SUPPLY

6V TO 29V, MAX 1.4A

WALL WART, BANANA JACK OR TURRET

FOR BEST PERFORMANCE, USE SHIELDED CABLES

OUTPUT SUPPLY

VARIABLE V, 200mA

BANANA JACK OR TURRET

DEFAULT VOLTAGE: 5V

JUMPER SELECTABLE (JP5)

OUTPUT SUPPLY

5V, 200mA

BANANA JACK OR TURRET

REF+ OUTPUT

100MHz, CMOS

MALE SMA

dc2429af

DEMO MANUAL DC2429A

Quick start proceDure

SETUP

Follow the steps provided in Figure 2 below. When using

a switching supply in Step 1, it is best to use a shielded

BNC power supply cable with BNC to banana plug adap

tors in Steps 1, 2, 3 and 6 to avoid coupling between the

input supply and output supplies.

Figure 2. DC2429A Setup

LEDs D1 to D4 should illuminate when power is applied in

Step 1. If the LEDs do not illuminate, verify jumpers JP1 to

JP4 are set to the ON position. If D4 does not illuminate,

verify Step 1’s input voltage is at least 350mV greater

than the desired voltage on the Variable, 200mA supply.

1. CONNECT 6V TO 20V

SUPPLY. (SHOULD BE

350mV GREATER THAN

THE HIGHER OF 6V OR

THE VARIABLE, 200mA

SUPPLY SETTING IN STEP 5)

2. CONNECT 3.3V, 800mA

SUPPLY TO PLL/VCO

DEMO BOARD 3.3V SUPPLY

3. CONNECT 5V, 200mA

SUPPLY TO PLL/VCO

DEMO BOARD 5V SUPPLY

4. CONNECT REF+ (J7) TO

PLL/VCO DEMO BOARD

3.3V SUPPLY

6. (FOR EXTERNAL VCOs)

CONNECT VARIABLE,

200mA SUPPLY TO

PLL/VCO DEMO BOARD

VCO SUPPLY

5. (FOR EXTERNAL VCOs)

SELECT CORRECT VCO

VOLTAGE

dc2429af

DEMO MANUAL DC2429A

typical Dc2429a reQuirements anD characteristics

Table 1. DC2429A Assembly Options

PARAMETER INPUT OR OUTPUT PHYSICAL LOCATION DETAILS

6V to 20V Power Supply Input J1 Wall Wart Connector or

J2 and J3 BNC Banana Jacks

6V to 20V input power supply voltage must be 350mV greater than

the higher of 6V or the desired variable, 200mA output voltage.

Up to 1.4A current consumption.

LEDs D1-D4 illuminate when power supplied.

o avoid coupling between input and output supplies it is best to

use shielded power supply cables.

3.3V, 800mA Output J4 and J5 BNC Banana Jacks Load shares 4 LT3042 to achieve 800mA output current capability.

See schematic.

5V, 200mA Output J8 and J9 BNC Banana Jacks

Variable, 200mA Output J10 and J11 BNC Banana

Jacks

JP5 selects output voltage

6V to 20V input power supply voltage must be 350mV greater than

the higher of 6V or the desired variable, 200mA output voltage.

Variable, 200mA

Output Voltage Selection

Input JP5 Selects variable, 200mA supply output voltage

(Options: 2.5V, 3.3V, 5V, 8V, 10V, 12V, 15V).

REF+ Output J7 Male SMA connector

100MHz, 3.3V CMOS thru 100Ω series, AC coupled.

REF– Output J6 (not installed)

Default: not installed. Install if differential reference is desired.

3.3V Jumper Input JP1 Default: set to ON.

Connected to LT3042 EN/UV pin (U1, U4, U5 and U6).

3.3V_REF Jumper Input JP2 Default: set to ON.

Connected to LT3042 EN/UV pin (U2).

5V Jumper Input JP3 Default: set to ON.

Connected to LT3042 EN/UV pin (U3).

Variable Jumper Input JP4 Default: set to ON.

Connected to LT3042 EN/UV pin (U8).

P1-P3 P4-P6 P7-P8

DC2429A

Mfr. #:

Buy DC2429A

Manufacturer:

Analog Devices Inc.

Description:

Power Management IC Development Tools PLL/VCO Supply and Reference Board

Lifecycle:

New from this manufacturer.

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DC2429A