LS7083 LSI Computer Systems, Inc., LS7083 Datasheet

LS7083

Manufacturer Part Number

LS7083

Description

Quadrature clock converter

Manufacturer

LSI Computer Systems, Inc.

Datasheet

1.LS7083.pdf (4 pages)

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7083/84-012703-1

DESCRIPTION:

The LS7083 and LS7084 are CMOS quadrature clock con-

verters. Quadrature clocks derived from optical or magnetic

encoders, when applied to the A and B inputs of the LS7083/

LS7084, are converted to strings of Up Clocks and Down

Clocks (LS7083) or to a Clock and an Up/Down direction

control (LS7084). These outputs can be interfaced directly

with standard Up/Down counters for direction and position

sensing of the encoder.

INPUT/OUTPUT DESCRIPTION:

RBIAS (Pin 1)

Input for external component connection. A resistor con-

nected between this input and V

pulse width (Tow). For proper operation, the output clock

pulse width must be less than or equal to the A, B pulse

separation (T

Supply Voltage positive terminal.

Supply Voltage negative terminal.

A (Pin 4)

Quadrature Clock Input A. This input has a filter circuit to

validate input logic level and eliminate encoder dither.

B (Pin 5)

Quadrature Clock Input B. This input has a filter circuit

identical to input A.

x4/x1 (Pin 6)

This input selects between x1 and x4 modes of operation.

A high-level selects x4 mode and a low-level selects the x1

mode. In x4 mode, an output pulse is generated for every

transition at either A or B input. In x1 mode, an output

pulse is generated in one combined A/B input cycle.

(See Figure 2.)

FEATURES:

• x1 and x4 mode selection

• Up to 16MHz output clock frequency

• Programmable output clock pulse width

• On-chip filtering of inputs for optical or

• TTL and CMOS compatible I/Os

• +4.5V to +10V operation (V

• LS7083, LS7084 (DIP);

magnetic encoder applications.

LS7083-S, LS7084-S (SOIC) - See Figure 1

U L

A3800

LSI/CSI

(Pin 3

(Pin 2)

LSI Computer Systems, Inc. 1235 Walt Whitman Road, Melville, NY 11747

)

PS)

QUADRATURE CLOCK CONVERTER

- V

adjusts the output clock

)

LS7083 - DNCK (Pin 7)

In LS7083, this is the DOWN Clock Output. This output con-

sists of low-going pulses generated when A input lags the B

input.

LS7084 - UP/DN (Pin 7)

In LS7084, this is the count direction indication output.

When A input leads the B input, the UP/DN output goes high

indicating that the count direction is UP. When A input lags

the B input, UP/DN output goes low, indicating that the count

direction is DOWN.

LS7083 - UPCK (Pin 8)

In LS7083, this is the UP Clock output. This output consists

of low-going pulses generated when A input leads the B in-

put.

LS7084 - CLK (Pin 8)

In LS7084, this is the combined UP Clock and DOWN Clock

output. The count direction at any instant is indicated by the

UP/DN output (Pin 7).

NOTE: For the LS7084, the timing of CLK and UP/DN re-

quires that the counter interfacing with LS7084 counts on the

rising edge of the CLK pulses.

RBIAS

LS7083/7084

DD(+V)

S S ( - V )

PIN ASSIGNMENT - TOP VIEW

(631) 271-0400 FAX (631) 271-0405

FIGURE 1

January 2003

DNCK

UPCK

x4/x1

CLK

U P / D N

Related parts for LS7083

LS7083 Summary of contents

Page 1

... DESCRIPTION: The LS7083 and LS7084 are CMOS quadrature clock con- verters. Quadrature clocks derived from optical or magnetic encoders, when applied to the A and B inputs of the LS7083/ LS7084, are converted to strings of Up Clocks and Down Clocks (LS7083 Clock and an Up/Down direction control (LS7084). These outputs can be interfaced directly with standard Up/Down counters for direction and position sensing of the encoder ...

Page 2

ABSOLUTE MAXIMUM RATINGS PARAMETER DC Supply Voltage Voltage at any input Operating temperature Storage temperature DC ELECTRICAL CHARACTERISTICS: (All voltages referenced PARAMETER Supply voltage Supply current x4/x1 Logic Low A, B Logic Low x4/x1Logic High ...

Page 3

... UPCK ( DNCK ( UPCK ( DNCK ( CLK ( CLK ( UP/ FIGURE 2. LS7083/LS7084 INPUT/OUTPUT TIMING DIAGRAM CURRENT RBIAS 1 MIRROR 4 FILTER A FILTER x4/ 7083/84-012703 DUAL ONE-SHOT CLOCK AND DIRECTION DECODE DUAL ONE-SHOT FIGURE 3. LS7083/LS7084 BLOCK DIAGRAM CLOCK 8 x1 CLOCK MUX 7 UP/DN The information included herein is believed to be accurate and reliable. However, LSI Computer Systems, Inc ...

Page 4

... Figure 4. Tow vs RBIAS CLOCK ENCODER B CLOCK R B FIGURE 6A. TYPICAL APPLICATION FOR LS7083 IN x4 MODE A CLOCK B CLOCK ENCODER FIGURE 6B. TYPICAL APPLICATION FOR LS7084 WITH x4/x1 MODE SELECTION 7083/84-012703 =10.0V DD 300 400 500 + x4/ UPCK DNCK ...

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