D710 データシートの表示（PDF） - Semtech Corporation

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D710

500 MHz Pin Electronics Driver,Window Comparator, and Load

Semtech Corporation 

Edge710

EDGE HIGH-PERFORMANCE PRODUCTS

Circuit Description (continued)

Driver Slew Rate Adjustment

Load

The driver rising and falling transition times are

independently adjustable. The RADJ and FADJ pins are

analog current inputs which establish the driver rise and

fall times.

Ideally, an external current source would be used for RADJ

and FADJ. However, for most applications (where the rise

and fall times are fixed), precision external resistors to a

positive voltage are acceptable. The currents into RADJ

and FADJ follow the equation:

RADJ, FADJ = (VCC - 0.7) / (Rext + 1.5).

RADJ (FADJ)

The load is capable of sourcing and sinking at least 35

mA dynamically, or being placed into a high impedance

state. The load may also be configured with separate

commutating voltage to act as a programmable voltage

clamp. In addition, the load may act as a 50Ω

transmission line termination.

Load Enable

The load enable input determines whether the load is active

or in high impedance. If LD_EN is more positive than

LD_EN*, the load is active and is capable of sourcing and

sinking currents. If LD_EN is more negative than LD_EN*,

the load is placed into a high impedance state.

1.5KΩ

LD_EN / LD_EN* are "Flex In" - wide voltage differential

inputs capable of receiving ECL, TTL, CMOS, or custom

levels. Single-ended operation is supported by connecting

the inverting input to the appropriate DC threshold level.

Rise/Fall

Adjust Current

Do NOT leave LD_EN / LD_EN* floating.

Commutating Voltage

Input Power Down

IPD_D is a TTL compatible input which affects both the

driver speed as well as high impedance leakage. With

IPD_D = 0, the driver functions normally. With IPD_D =

1, the driver is in IPD mode, where it still functions,

although with slower rise and fall times, but with an

extremely low HiZ leakage current.

VCM_IN is a high input impedance analog voltage input

which sets the commutating voltage of the load. If LOAD

is more positive than VCM_IN, the bridge will sink current

from the DUT into the load. If LOAD is more negative than

VCM_IN, the load will source current from the load into

the DUT.

Do not leave IPD_D floating !! If IPD_D is not used,

connect it to ground.

VCM_IN

DUT

VCM_IN

DUT

LOAD > VCM_IN

 2000 Semtech Corp.

LOAD < VCM_IN

5

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