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E693AHJ

500 MHz Monolithic Dual Pin Electronics Driver

Semtech Corporation 

Edge693

EDGE HIGH-PERFORMANCE PRODUCTS

Circuit Description

Introduction

Driver Levels

The driver circuit will force the DOUT output to one of

three states:

1. DVH (driver high voltage level)

2. DVL (driver low voltage level)

3. High Impedance (Hi Z).

Both driver digital control inputs (DHI/DHI*, DRVEN/

DRVEN*) are wide-voltage differential inputs capable of

receiving ECL, TTL, and CMOS signals. Single-ended

operation is achievable by generating the proper

threshold levels for the inverting inputs.

DVH and DVL are high-input impedance voltage controlled

inputs that establish the driver logical high and low levels

respectively.

Slew Rate Adjustment

The driver rising and falling slew rates are adjustable

from 3.0 V/ns to 1 V/ns. The SLEWADJ signals are

current controlled inputs that vary the rising and falling

edge slew rates. An input current of 2.0 mA translates

to a slew rate of 3.0 V/ns. An input current of 0.8 mA

forces a 1 V/ns edge (see Figure 1).

Drive Enable

The drive enable (DRVEN/DRVEN*) inputs control

2.5

whether the driver is forcing a voltage or is placed in a

high-impedance state. If DRVEN is more positive than

DRVEN*, the output will force either DVL or DVH,

depending on the driver data inputs. When DRVEN is

more negative than DRVEN*, the output is set to high-

1.0

impedance, independent of the driver data inputs.

Driver Data

The driver data inputs (DHI/DHI*) determine whether

the driver output is high or low. If DHI is more positive

than DHI*, the output will force DVH when the driver is

enabled. If DHI is more negative than DHI*, the output

will force DVL when the driver is enabled.

Table 1 summarizes the functionality of the driver enable

and driver data pins.

0.8

2.0

SLEWADJ (mA)

(BIAS = 1.5 mA)

Figure 1. Slew Rate Control

Notice that the driver A slew rate and driver B slew rate

are independent. However, the rising and falling edge

slew rates on each driver track each other and are not

independent (see Figure 2).

DRVEN, DRVEN*

DHI, DHI*

DOUT

DRVEN > DRVEN*

DHI > DHI*

DVH

a

DRVEN > DRVEN*

DHI < DHI*

DVL

b

DRVEN < DRVEN*

X

HiZ

a. SLEWADJ = 2.0 mA, Rising SR = Falling SR = 2.5V/ns.

b. SLEWADJ = 0.8 mA, Rising SR = Falling SR = 1.0V/ns.

Table 1. DRVEN and DHI Pin Functionality

Figure 2. Output Slew Rate Adjustability

 2000 Semtech Corp.

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