USB-QUAD08
Eight-channel Quadrature Encoder Input Device

Specifications

Document Revision 1.1
May 2012© Copyright 2012

USB-QUAD08 Specifications
All specifications are subject to change without notice.
Typical for 25 °C unless otherwise specified.
Specifications in italic text are guaranteed by design.

CounterTable 1. Counter specifications
Parameter

Specification

Counter typeCounters
Counter input modes
Mode options
Index options
Resolution
Quadrature mode input frequency
Normal mode input frequency
De-bounce times

FPGA
8 (quadrature or normal)
Quadrature (x1, x2, x4)/Totalize, Pulse width, Period
Non-Recycle, Range Limit, Clear on Read, Modulo-N, Up/Down, Decrement
Latch, Clear|Reload, Decrement, Gate; mode dependent.
16, 32 or 48-bit counters
10/5/2.5 MHz, max, in x1/x2/x4
10 MHz, max
16 steps from 500 ns to 25 ms; positive or negative edge sensitive; glitch detectmode or de-bounce mode; software-selectable.
48 MHz (24 MHz – 30 ppm with a 2xDLL (delay locked loop))
Internal or external scan pacer up to 8 MHz
20.83 ns; 208.3 ns; 2.083 µs; or 20.83 µs

Time-base and accuracyCounter read pacer
Period/pulse width resolution

Input
Table 2. Input specifications
Parameter

Specification

Receiver type

SN75ALS175 quad differential receiver

Configuration

8 channels. Each channel consists of PhaseA input, PhaseB input and Index input;
each input is selectable as single-ended or differential.
Differential:
 PhaseA, PhaseB and Index (+) inputs at the user connector are routed to the(+) inputs of differential receiver.
 PhaseA, PhaseB and Index (–) inputs at the user connector are routed to the(–) inputs of the differential receiver.
Single-ended: PhaseA, PhaseB and Index (+) inputs at the user connector are routed to the(+) inputs of the differential receiver.
 PhaseA, PhaseB and Index (–) inputs at the user connector are left floating.
The (–) inputs of the differential receiver are routed to the +3 V reference.
±12 V
±12 V
±200 mV
50 mV, typ12 kΩ, min±14 V, max Meets or exceeds ANSI EIA/TIA-422-B, EIA/TIA-423-B, RS-485.
 Meets ITU recommendations V.10, V.11, X.26, X.27.
 Designed for multipoint busses on long lines and in noisy environments.

Common mode input voltage range
Differential input voltage range
Input sensitivity
Input hysteresis
Input impedance
Absolute maximum input voltage
Miscellaneous2

Specifications

USB-QUAD08

Digital I/O – Timer outputs – Terminal count outputs
Table 3. Output specifications
Parameter

Specification

Number of I/O
Configurable
Input:
Input characteristics
Input highInput low
Output:Output characteristics
Output logic supply
CEMF Supply (CLMP+)
Output highOutput low
Output sink current

8 independent
Timer outputs (DIO6, DIO7 only), Terminal count/Modulo, Input/Output (default)

Output generation
Asynchronous throughput
Timer outputs:
Number of channels

Effective frequency range

Weak 10 kΩ resistor pulled-up to 5V with protection diode (+V USB – diode drop).
+2.0 V to 42.4 Vpk 50 VDC
0 V to 0.8 V
Open-collector Darlington transistors with CEMF suppression diodes (ULN2803)
User voltage supply up to 50 VDC (42.4 Vpk) for strong drive.
Connect to logic supply positive terminal up to 50 VDC (42.4 Vpk)
2.0 VDC to 50 VDC (42.4 Vpk); dependent upon logic supply.
<0.8 V
500 mA per pin, 2.5 A max. per device (parallel connections for higher current needs)
requires external supply.
Counter events or timer outputs (bits 6 and 7); asynchronous generation
4000 updates/second, typ (tested on Windows XP and Windows Vista32)
Two 16-bit
 Timer Output 0 (DIO6)
 Timer Output 1 (DIO7)
0.01123 Hz to 5 MHz

Trigger and pacer
Table 4. Trigger and pacer specifications
Parameter

Specification

Digital type
Trigger types
Pacer
Trigger and pacer inputs

Edge/level sensitive; software-selectable.
Start acquisition processLatch counter values for read back Internal (software) External–0.5 V to 7.0 V
8 MHz, max

Trigger and pacer input
External pacer frequency

Indicator LEDs
Table 5. LED specifications
Parameter

Specification

Power LED
Status LED
Channel LEDs

Indicates that the device’s microcontroller has power and is running.
Indicates that the USB is configured; blinks to indicate USB traffic.
Indicates that the encoder/counter is receiving a valid signal on any of the inputs.

3Specifications

USB-QUAD08

PowerTable 6. Power specifications
Parameter

Condition

Specification

VUSB (+5V) (Note 1)

 Connected to self-powered hub
 Connected to externally-powered root port hub

4.5 V to 5.25 V
480 mA max; 225 mA typ

VUSER (+5V) current
Encoder supply

4.5 V to 5.25 V; 20 mA max
External supply of 1.5 A @ 5 VDC fused up to 42.4 Vpk (50 VDC) @ 2 A
Protection diodes (30BQ060, 0.5Vmax drop) protecting against reverse polarity.
0452002. - Littelfuse 2A NANO2® Slo-Blo® Subminiature Surface Mount Fuse

Encoder supply fuse

Note 1: "Self-powered hub" refers to a USB hub with an external power supply. Self-powered hubs allow aconnected USB device to draw up to 500 mA. "Root port hubs" reside in the PC USB host Controller.
The USB port(s) on your PC are root port hubs. All externally-powered root port hubs (desktop PC)
provide up to 500 mA of current for a USB device. Battery-powered root port hubs provide 100 mA or
500 mA, depending upon the manufacturer. A laptop PC that is not connected to an external power
adapter is an example of a battery-powered root port hub. If your laptop PC is constrained to the100 mA max, use a self-powered hub.

Environmental
Table 7. Environmental specifications
Parameter

Specification

Operating temperature range
Storage temperature range
Humidity

0 °C to 60 °C–40 °C to 85 °C
0% to 90% non-condensing

Mechanical
Table 8. Mechanical specifications
Parameter

Specification

Dimensions (L × W × H)

245 × 146 × 50 mm (9.6 × 5.7 × 2.0 in.)USB specifications
Table 9. USB specifications
Parameter

Specification

Device type

USB 2.0 high-speed mode (480 Mbps) if available (recommended), otherwise, USB 1.1
full-speed mode (12 Mbps)
USB 2.0 (recommended) or USB 1.1
A-B cable, UL type AWM 2725 or equivalent. (min 24 AWG VBUS/GND,
min 28 AWG D+/D–)
3 meters, max (9.84 feet)

Device compatibility
USB cable type
USB cable length4Specifications

USB-QUAD08

I/O connectors
Table 10. I/O Connector specifications
Parameter

Specification

Connector type Screw terminals: 10 banks; detachable 37-pin D type: J12(external) and J50 (internal)
16 AWG to 28 AWG

Wire gauge range for screwterminals
Compatible cable with the37-pin connectors
Compatible accessory
products with the 37-pinconnectorsC37F-4X9F-1M
C37FF-x
C37FFS-x
SCB-37
CIO-MINI37
CIO-MINI37/DST
CIO-MINI37-VERT
CIO-MINI37-VERTDSTCIO-TERMINAL

5Specifications

USB-QUAD08

Screw terminal connectors
Table 11. Differential mode pinout
Signal name
ENC+
0PHA+
0PHA–
0PHB+
0PHB–
0INDX+
0INDX–GND

Terminal description
Encoder power output (Note 2)
Counter 0 Phase A highCounter 0 Phase A low
Counter 0 Phase B highCounter 0 Phase B low
Counter 0 Index highCounter 0 Index lowGround

Signal name
GND
1INDX–
1INDX+
1PHB–
1PHB+
1PHA–
1PHA+
ENC+

Terminal description
GroundCounter 1 Phase A highCounter 1 Phase A low
Counter 1 Phase B highCounter 1 Phase B low
Counter 1 Index highCounter 1 Index low
Encoder power output (Note 2)

ENC+
2PHA+
2PHA–
2PHB+
2PHB–
2INDX+2INDX–
GND

Encoder power output (Note 2)
Counter 2 Phase A highCounter 2 Phase A low
Counter 2 Phase B highCounter 2 Phase B low
Counter 2 Index highCounter 2 Index low
GroundGND
3INDX–3INDX+
3PHB–
3PHB+
3PHA–
3PHA+
ENC+Ground
Counter 3 Phase A highCounter 3 Phase A low
Counter 3 Phase B highCounter 3 Phase B low
Counter 3 Index highCounter 3 Index low
Encoder power output (Note 2)

ENC+
4PHA+
4PHA–
4PHB+
4PHB–
4INDX+
4INDX–
GND

Encoder power output (Note 2)
Counter 4 Phase A highCounter 4 Phase A low
Counter 4 Phase B highCounter 4 Phase B low
Counter 4 Index highCounter 4 Index low
GroundGND
5INDX–
5INDX+
5PHB–
5PHB+
5PHA–
5PHA+
ENC+

GroundCounter 5 Phase A highCounter 5 Phase A low
Counter 5 Phase B highCounter 5 Phase B low
Counter 5 Index highCounter 5 Index low
Encoder power output (Note 2)

ENC+
6PHA+
6PHA–

Encoder power output (Note 2)
Counter 6 Phase A highCounter 6 Phase A low

GND
7INDX–
7INDX+

GroundCounter 7 Phase A highCounter 7 Phase A low

6PHB+

Counter 6 Phase B high

7PHB–

Counter 7 Phase B high

6PHB–

Counter 6 Phase B low

7PHB+

Counter 7 Phase B low

6INDX+Counter 6 Index high

7PHA–

Counter 7 Index high

6INDX–Counter 6 Index low

7PHA+

Counter 7 Index low

GND

GroundENC+

Encoder power output (Note 2)+5V

Power output+5VPower output

XTRIG

External trigger input

CLMP+CEMF protection for DIO (Note 5)

XPCR

External pacer input

ENC+ IN

Encoder power input(Note 2)

GNDGround

GND

GroundDIO0

DIO channel 0

DIO1

DIO channel 1

DIO2

DIO channel 2

DIO3

DIO channel 3

DIO4

DIO channel 4

DIO5

DIO channel 5

DIO6*

DIO channel 6 (Note 3)

DIO7*

DIO channel 7 (Note 4)

Note 2: External supply when operating in encoder mode. ENC+ IN is passed to all ENC+ lines with optional

protection diodes to prevent reverse connection.
Note 3: DIO6 can also function as Timer Output 0.
Note 4: DIO7 can also function as Timer Output 1.
Note 5: CEMF protection to the DIO supply; it is not a source.

6Specifications

USB-QUAD08

Table 12. Single-ended mode pinout
Signal name
ENC+
0PHA+
0PHA–
0PHB+
0PHB–
0INDX+
0INDX–
GND

Terminal description
Encoder power output (Note 6)
Counter 0 Phase A
Floating (Note 7)
Counter 0 Phase B
Floating (Note 7)
Counter 0 Index
Floating (Note 7)
GroundSignal name
GND
1INDX–
1INDX+
1PHB–
1PHB+
1PHA–
1PHA+
ENC+Terminal description
GroundFloating (Note 7)
Counter 1 Phase A
Floating (Note 7)
Counter 1 Phase B
Floating (Note 7)
Counter 1 Index
Encoder power output (Note 6)

ENC+
2PHA+
2PHA–
2PHB+
2PHB–
2INDX+2INDX–GND

Encoder power output (Note 6)
Counter 2 Phase A
Floating (Note 7)
Counter 2 Phase B
Floating (Note 7)
Counter 2 Index
Floating (Note 7)
GroundGND
3INDX–3INDX+
3PHB–
3PHB+
3PHA–
3PHA+
ENC+

GroundFloating (Note 7)
Counter 3 Phase A
Floating (Note 7)
Counter 3 Phase B
Floating (Note 7)
Counter 3 Index
Encoder power output (Note 6)

ENC+
4PHA+
4PHA–
4PHB+
4PHB–
4INDX+
4INDX–
GND

Encoder power output (Note 6)
Counter 4 Phase A
Floating (Note 7)
Counter 4 Phase B
Floating (Note 7)
Counter 4 Index
Floating (Note 7)
GroundGND
5INDX–
5INDX+
5PHB–
5PHB+
5PHA–
5PHA+
ENC+

GroundFloating (Note 7)
Counter 5 Phase A
Floating (Note 7)
Counter 5 Phase B
Floating (Note 7)
Counter 5 Index
Encoder power output (Note 6)

ENC+
6PHA+
6PHA–

Encoder power output (Note 6)
Counter 6 Phase A
Floating (Note 7)GND
7INDX–
7INDX+

GroundFloating (Note 7)
Counter 7 Phase A

6PHB+

Counter 6 Phase B

7PHB–

Floating (Note 7)

6PHB–

Floating (Note 7)

7PHB+

Counter 7 Phase B

6INDX+Counter 6 Index

7PHA–

Floating (Note 7)

6INDX–

Floating (Note 7)

7PHA+

Counter 7 Index low

GND

GroundENC+

Encoder power output (Note 6)+5VPower output+5V

Power output

XTRIG

External trigger input

CLMP+

CEMF protection for DIO (Note 10)

XPCR

External pacer input

ENC+ IN

Encoder power input (Note 6)

GND

GroundGND

GroundDIO0

DIO channel 0

DIO1

DIO channel 1

DIO2

DIO channel 2

DIO3

DIO channel 3

DIO4

DIO channel 4

DIO5

DIO channel 5

DIO6*

DIO channel 6 (Note 8)

DIO7*

DIO channel 7 (Note 9)

Note 6: External supply when operating in encoder mode. ENC+ IN is passed to all ENC+ lines with optional

protection diodes to prevent reverse connection.
Note 7: In single-ended mode, the PhaseA, PhaseB and Index (–) inputs at the user connector are left floating.

The (–) inputs of the differential receiver are routed to +3 V reference.
Note 8: DIO6 can also function as Timer Output 0.
Note 9: DIO7 can also function as Timer Output 1.
Note 10:
CEMF protection to the DIO supply; it is not a source.

7Specifications

USB-QUAD0837-pin connectors
J12Table 13. Differential mode pinout
Pin12345678910111213141516171819Signal name
0PHA –
ENC+
0PHB–
ENC+
0INDX–
NC
2PHA–
ENC+
2PHB–
ENC+
3PHA–
ENC+
3PHB–
ENC+
1PHA–
ENC+
1PHB–
ENC+
1INDX–Pin description
Counter 0 Phase A low
Encoder power outputCounter 0 Phase B low
Encoder power output
Counter 0 Index low
No connection
Counter 2 Phase A low
Encoder power output
Counter 2 Phase B low
Encoder power output
Counter 3 Phase A low
Encoder power output
Counter 3 Phase B low
Encoder power output
Counter 1 Phase A low
Encoder power output
Counter 1 Phase B low
Encoder power output
Counter 1 Index low

Pin2021
22
23
24
25
26
27
28
2930
31
32
33
34
35
36
37

Signal name
0PHA+
0PHB+
GND
0INDX+2INDX–
2PHA+
2PHB+
GND
2INDX+3INDX–3PHA+
3PHB+GND
3INDX+
1PHA+
1PHB+
GND
1INDX+Pin description
Counter 0 Phase A highCounter 0 Phase B highGroundCounter 0 Index highCounter 2 Index low
Counter 2 Phase A highCounter 2 Phase B highGroundCounter 2 Index highCounter 3 Index low
Counter 3 Phase A highCounter 3 Phase B highGroundCounter 3 Index highCounter 1 Phase A highCounter 1 Phase B highGroundCounter 1 Index highTable 14. Single-ended mode pinout
Pin12345678910111213141516171819Signal name
0PHA –
ENC+0PHB–
ENC+0INDX–
NC2PHA–
ENC+
2PHB–
ENC+
3PHA–
ENC+
3PHB–ENC+
1PHA–
ENC+
1PHB–
ENC+
1INDX–

Note 11:

Pin description
Floating (Note 11)
Encoder power output
Floating (Note 11)
Encoder power output
Floating (Note 11)
No connection
Floating (Note 11)
Encoder power output
Floating (Note 11)
Encoder power output
Floating (Note 11)
Encoder power output
Floating (Note 11)
Encoder power output
Floating (Note 11)
Encoder power output
Floating (Note 11)
Encoder power output
Floating (Note 11)

Pin202122232425262728293031323334353637Signal name
0PHA+
0PHB+
GND
0INDX+2INDX–
2PHA+
2PHB+
GND
2INDX+3INDX–3PHA+
3PHB+GND
3INDX+
1PHA+
1PHB+
GND
1INDX+Pin description
Counter 0 Phase A
Counter 0 Phase B
GroundCounter 0 Index
Floating (Note 11)
Counter 2 Phase A
Counter 2 Phase B
GroundCounter 2 Index
Floating (Note 11)
Counter 3 Phase A
Counter 3 Phase B
GroundCounter 3 Index highCounter 1 Phase A
Counter 1 Phase B
GroundCounter 1 Index

In single-ended mode, the PhaseA, PhaseB and Index (–) inputs at the user connector are left
floating. The (–) inputs of the differential receiver are routed to +3 V reference.

8Specifications

USB-QUAD08

J50
Table 15. Differential mode pinout
Pin12345678910111213141516171819Signal name
4PHA –
ENC+
4PHB–
ENC+
4INDX–
NC
6PHA–
ENC+
6PHB–
ENC+7PHA–
ENC+
7PHB–
ENC+
5PHA–
ENC+
5PHB–
ENC+
5INDX–Pin description
Counter 4 Phase A low
Encoder power output
Counter 4 Phase B low
Encoder power output
Counter 4 Index low
No connection
Counter 6 Phase A low
Encoder power output
Counter 6 Phase B low
Encoder power output
Counter 7 Phase A low
Encoder power output
Counter 7 Phase B low
Encoder power output
Counter 5 Phase A low
Encoder power output
Counter 5 Phase B low
Encoder power output
Counter 5 Index low

Pin
20
21
2223
24
25
2627282930
3132
3334353637Signal name
4PHA+
4PHB+
GND
4INDX+6INDX–
6PHA+
6PHB+
GND
6INDX+
7INDX–
7PHA+
7PHB+
GND
7INDX+
5PHA+
5PHB+
GND
5INDX+Pin description
Counter 4 Phase A highCounter 4 Phase B highGroundCounter 4 Index highCounter 6 Index low
Counter 6 Phase A highCounter 6 Phase B highGround
Counter 6 Index highCounter 7 Index low
Counter 7 Phase A highCounter 7 Phase B highGroundCounter 7 Index highCounter 5 Phase A highCounter 5 Phase B highGroundCounter 5 Index highTable 16. Single-ended mode pinout
Pin
1234567891011121314
1516171819Signal name
4PHA –
ENC+
4PHB–
ENC+
4INDX–
NC
6PHA–
ENC+
6PHB–
ENC+
7PHA–
ENC+
7PHB–
ENC+
5PHA–
ENC+
5PHB–
ENC+5INDX–

Note 12:Pin description
Floating (Note 12)
Encoder power output
Floating (Note 12)
Encoder power output
Floating (Note 12)
No connection
Floating (Note 12)
Encoder power output
Floating (Note 12)
Encoder power output
Floating (Note 12)
Encoder power output
Floating (Note 12)
Encoder power output
Floating (Note 12)
Encoder power output
Floating (Note 12)
Encoder power output
Floating (Note 12)

Pin2021222324252627282930
3132
3334353637

Signal name
4PHA+
4PHB+
GND
4INDX+6INDX–
6PHA+
6PHB+
GND
6INDX+
7INDX–
7PHA+
7PHB+
GND
7INDX+
5PHA+
5PHB+
GND
5INDX+Pin description
Counter 4 Phase A
Counter 4 Phase B
GroundCounter 4 Index
Floating (Note 12)
Counter 6 Phase A
Counter 6 Phase B
GroundCounter 6 Index
Floating (Note 12)
Counter 7 Phase A
Counter 7 Phase B
GroundCounter 7 Index
Counter 5 Phase A
Counter 5 Phase B
GroundCounter 5 Index

In single-ended mode, the PhaseA, PhaseB and Index (–) inputs at the user connector are left
floating. The (–) inputs of the differential receiver are routed to +3 V reference.

9Measurement Computing Corporation
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Suite 1008
Norton, Massachusetts 02766(508) 946-5100
Fax: (508) 946-9500
E-mail: info@mccdaq.com
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