US Digital

EA Incremental Encoder Adapter

Overview

Single-ended driver or differential driver/receiver available
Three digital channels (A/B/I encoder signals) per adapter
Variety of connector options
Low cost

Differential Cable Driver/Receiver: The EA-D-L-10 is a differential RS-422 cable driver which converts the single-ended A/B/I output from USD's single-ended incremental encoders (or any three TTL level digital signals) to 3 pairs of differential signals. This allows the encoder to drive long cables (6 to...

Product Specifications

Parameter	Min.	Typ.	Max.	Units	Notes
Supply Voltage	4.5	-	5.5	Volts	-
Supply Current	-	4.5	9.0	mA	-
Output High Voltage	2.5	-	-	Volts	I(OH) = 20 mA
Output Low Voltage	-	-	0.8	Volts	I(OL) = 20 mA
Propagation Time	-	-	15	ns	-

Parameter	Min.	Typ.	Max.	Units	Notes
Supply Voltage	9.5	-	32	Volts	-
Supply Current	-	-	10	mA	-
Propagation Time	-	236	330	ns	-
Output IC	-	-	-	-	ET7272

Parameter	Min.	Typ.	Max.	Units	Notes
Supply Voltage	4.5	-	5.5	Volts	-
Supply Current	-	16	25	mA	-
Input High Voltage	2.0	-	-	Volts	I(OH) = 20 mA
Input Low Voltage	-	-	0.8	Volts	I(OL) = 20 mA
Propagation Time	-	-	35	ns	-

Parameter	Min.	Max.	Units
Storage Temperature	-40	100	C
Operating Temperature	-40	100	C

EA-D10, EA-D10HV, EA-R10

Pin	Name	Description
1	GND	Ground
2	GND	Ground
3	I-	Index-
4	I+	Index+
5	A-	A- channel
6	A+	A+ channel
7	PWR	+5VDC power, +9.5 to +32VDC (HV)
8	PWR	+5VDC power, +9.5 to +32VDC (HV)
9	B-	B- channel
10	B+	B+ channel

Pin	Description	Color
1	+5VDC power	Orange
2	A channel	Blue
3	Ground	Brown or White / Orange
4	B channel	Yellow or White / Blue

EA-D5, EA-D5HV, EA-R8, 5-pin Connector Options

Pin	Description	Color
1	Ground	Brown
2	Index	Violet
3	A channel	Blue
4	+5VDC power +9.5 to +32VDC power (HV)	Orange
5	B channel	Yellow

Connector	Description
H5	5-pin right-angle male header soldered in place.
FH5	5-pin finger-latching header soldered in place.
W5	Five 12" discrete wires, no connector on the end.
C5	Five 6" discrete wires with a standard mating connector on the end.
LC5	Five 6" discrete wires with a locking mating connector on the end.
FC5	Five 6" discrete wires with a finger-latching mating connector.
MIC4	Four 6" discrete wires with a micro mating connector.

W5	H5	FH5	C5

LC5	FC5	MIC4

Product Description

Differential Cable Driver/Receiver:

The EA-D-L-10 is a differential RS-422 cable driver which converts the single-ended A/B/I output from USD's single-ended incremental encoders (or any three TTL level digital signals) to 3 pairs of differential signals. This allows the encoder to drive long cables (6 to 1000 ft.) and reduces false switching in noisy environments. Various connector options are available on the 5-pin input side of this adapter. The output differential signals are available on a male 10-pin finger-latching connector. The differential signal from the EA-D-L-10 can be connected directly to USD's PCI-3E-D, PCI-4E-D, USB4-D and AD4B-D interface products.

The corresponding receiver, EA-R-L-10 converts the received differential signals back to 3 single-ended TTL level digital signals. The differential input side of the receiver is a 10 pin male finger latching connector. Various connector options are available on the single ended 5-pin output side.

The EA-D-H-10 is the same as the EA-D-L-10, but offers a wide operating voltage range of 9.5 to 32VDC. This adapter allows 5V encoders to be used in high voltage applications.

Single-ended Cable Driver:

This driver converts 3 single-ended, low drive digital signals to 3 single-ended, high current drive digital signals. This variant is useful since the TTL outputs of some incremental encoders can sink (pull down) just under 4mA and source (pull up) only about 200 uA.

The EA-D-L-5 is a single-ended cable driver that connects to the 5-pin output of USD's single-ended output incremental encoders. Three single-ended high drive outputs and power and ground inputs are provided through a positive finger-latching connector.

The EA-D-H-5 is the same as the EA-D-L-5, but offers a wide operating voltage range of 9.5 to 32VDC. The EA-D-H-5 allows 5V encoders to be used in high voltage applications.

The EA-D-L-10 and EA-D-L-5 cable drivers use an industry standard 26C31 driver chip. The EA-D-H-10 and EA-D-H-5 use the ET7272 driver chip. An on-board 0.1 microfarad bypass capacitor across the power pins on each of these adapters compensates for inductance and noise, which can be expected at the end of a long cable. The cable receivers use an industry standard 26C32 receiver chip.

US Digital can supply nearly any cable to your specifications. See the Cables & Connectors page for more information.