Linear Technology DC150A Manuale utente

Linear Technology Corporation

DESCRIPTION

There is a demonstration board available for the

LTC1067/LTC1067-50. Demonstration board 150A

has the LTC1067 part installed and the board 150B

has the LTC1067-50 installed. The schematic for

the board is shown in Figure 15 and the assembly

drawing is shown in Figure 16. To obtain a demon-

stration board, call your local representative or Lin-

ear Technology’s marketing department. The

demonstration board has all integrated circuits,

connectors and decoupling capacitors installed.

The board is ready to be configured with the ap-

propriate resistors and jumper connections. There

are two sets of power supply connections. One is

for the LTC1067/LTC1067-50 and the other is for

the buffering op amp on the board. Having separate

connections gives the board the most flexibility. The

two sets of supplies can be connected together if a

common supply is desired. When configuring the

board for split supply operation, a jumper wire must

be installed in the JPAGND position. This connects

theAGND pin of the device to the ground plane of

the board. The JPVNEG jumper must be left open.

The power supply is then connected to V+, V –and

GND turrets (all of the GND turrets on the board

are the same). For single supply operation, insert a

wire in the JPVNEG jumper and leave the JPAGND

jumper open. This connects the V –pin to the

board’s ground plane. The JPAGND jumper must

be left open so that the on-chip resistor network

can set theAGND potential at the midpoint of the

supply. Connect the power supply to V+ and any

GND turret.

The V –turret can be left open or shorted to the

adjacent GND turret. If the buffering op amp is run

on the same single voltage supply, the VOA+ turret

and the V+ turrets must be connected together and

the VOA –turret must be shorted to the adjacent

GND turret.

The J1 BNC connector is the clock input. There is a

200W series resistor connected between the con-

nector and the CLK pin of the part. This resistor,

coupled with the CLK pin’s input capacitance, slows

down the rise and fall times of the clock signal and

decreases high frequency coupling. The clock in-

put is not terminated to 50W or 75W. An external

terminator should be used. Jumpers JP51 and

JP61 are connected in parallel with R51 and R61

respectively. Jumper JP51 connects the LPApin of

the part with the SApin. This can be used for oper-

ating modes 1 or 2.Alternatively, a 0W resistor in

the R51 position fulfills the same requirement. The

JP61

jumper connects the SA pin of the part to

the AGND pin.

This would be used for operating

Mode 3. Here, a 0W resistor in the R61 position

also works. Jumpers JP52 and JP62 perform the

same functions on the B side of the part. The buff-

ering amplifier can be configured for inverting or

noninverting operation. For inverting applications,

connect jumper JP2 positions 1 and 2.Additionally,

connect jumper JP4 for split supply applications or

JP8 for a single supply. For a noninverting applica-

tion, connect jumper JP2 positions 2 and 3.

Several other jumpers should be connected as fol-

lows:

JP1: Install a jumper wire from position 1 to position

2, leave the other positions open.

JP5: Install a jumper wire if split supply, leave open

if single supply.

JP6: Leave open.

JP7: Install a jumper wire.

JP9: Install a jumper wire if single supply, leave

open if split supply.

DC150A

LTC1067, LTC1067-50

DEMONSTRATION CIRCUIT USERS GUIDE

Linear Technology Corporation

DC150A Schematic (Also available in the datasheet)

DC150ALayout (Also available in the datasheet)

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