EDAC2 Encoder Digital to Analog Converter
EDAC2 Features
- Converts any incremental encoder into an analog position sensor
- 12 bit analog resolution
- 0 to 4.095V or 0 to 10V unipolar output voltage operation
- ± 4.095 or ± 10V bipolar output voltage operation
- Reset can be configured to zero or mid-range voltage
- Simple DIP switch defined programming
- DIN rail mounting is available
- TTL logic level output bit to indicate direction of rotation or linear movement
See more info below
Configure the EDAC2
The EDAC2 is no longer available for purchase.
EDAC2 Product Description
The EDAC2 converts the A and B quadrature output of an incremental encoder into a voltage that is proportional to the encoder position. The output from the encoder causes an internal 12-bit counter to count up or down. The output of the counter is fed into a 12-bit DAC that converts the 12-bit position count value to an analog voltage.
Eight DIP switches are provided to select various options. The user can choose unipolar output mode with 0 to 4.095V or 0 to 10V output, bipolar output mode with ±4.095V or ±10V output, 1X or 4X counting, reset on index, reverse rotation, midrange reset and range limit counting. Full scale output in 10V mode is actually 9.962V.
The EDAC2 has an internal counter that may be reset in one of three ways: by pressing the reset button, power cycling the unit or enabling the reset on encoder index. The reset may be configured to either mid-range or zero volts.
The EDAC2 also provides a TTL logic level output bit, which changes state to indicate the polarity of the analog voltage output.
Power for the EDAC2 is provided by an external power supply which also provides +5VDC to an external encoder through the encoder input connector. A three position screw terminal block provides the analog output connections and logic level direction bit output.
Product Specifications
View here or download the specifications
Electrical
Unless otherwise specified, all accuracy measurements assume operation within temperature range 0C to 70C.
| Parameter | Min. | Typ. | Max. | Units | Notes |
|---|---|---|---|---|---|
| Voltage Out to Encoder | 4.8 | 5.0 | 5.2 | Volts | Under 100mA load |
| Input Supply Voltage | 12 | - |
16 | Volts | |
| Supply Current | - - |
110 255 |
- - |
mA mA |
12V input, no encoder load 12V input, 250mA encoder load |
| Full Scale Output Error - Analog Output | -0.5 -1.5 |
0.25 ±0.25 |
0.5 1.5 |
% full scale % full scale |
0 - 4.095V output range 0 - 10V output range |
| Integral Non-linearity Error - Analog Output | -3.0 -8.0 |
±1.0 ±3.0 |
3.0 8.0 |
mV mV |
0 - 4.095V output range 0 - 10V output range |
| Offset Error - Analog Output | -6.0 -6.0 |
±1.0 ±1.0 |
6.0 6.0 |
mV mV |
0 - 4.095V output range 0 - 10V output range |
| Quadrature Encoder Inputs* Logic Low Logic High |
0 2.0 |
0.4 5.0 |
0.8 5.75 |
Volts Volts |
|
| Polarity Bit Output Logic Low Logic High |
- 2.4 |
- - |
0.4 - |
Volts Volts |
8mA (sinking current) -4mA (sourching current) |
| Analog Output Load Impedance | 2000 | - | - | Ohms |
* Diode clamped to ground and +5V, 5kΩ pullup to +5V.
Absolute Maximum Ratings
| Parameter | Min. | Typ. | Max. | Units |
|---|---|---|---|---|
| Operating Temperature | 0 | - | 70 | C |
| Encoder Current* | 0 | - | 250 | mA |
| Quadrature Input Frequency | 0 | - | 400 | kHz |
| Analog Output Update Frequency | 0 | - | 400 | kHz |
* +5VDC power for external encoder.
DIP Switches
The EDAC2 is programmed by eight DIP switches in either an up or down position.
| Switch | Name | Up ↑ | Down ↓ | Explanation |
|---|---|---|---|---|
| 0 | Not Used | - | - | - |
| 1 | Reset | Mid-range | Zero | Reset voltage level |
| 2 | Range Limit | Range Limit | Rollover | Sets counting mode |
| 3 | Count Multiplier | 1X | 4X | Enables quadrature counting |
| 4 | Analog Voltage | 4.095V | 10V | Sets full scale output voltage |
| 5 | Reverse | A / B | B / A | Swaps increasing count direction |
| 6 | Index | Reset | No Reset | Ignores the index or resets on index |
| 7 | Output Mode | Unipolar | Bipolar | 0 to +VDC or ±VDC output |
Pin-outs
Encoder Input:
| Pin | Description |
|---|---|
| 1 | Ground |
| 2 | Index |
| 3 | A channel |
| 4 | +5VDC power |
| 5 | B channel |
Analog Output:
| Pin | Description |
|---|---|
| 1 | Ground |
| 2 | +VDC output |
| 3 | Polarity |
Power Input:
| Pin | Description |
|---|---|
| Center | 13 to 16VDC |
| Outer Barrel | Ground |
Product Change Notifications
| Title | Date | Description | Download |
|---|---|---|---|
| PCN 1011 | 9/21/2011 | The AD2B, AD4B, AD7, EADAPT, EDAC2, EDIVIDE, EPOT, EQUAD, ESUM, ESWITCH, ETACH2, SEI-USB, USB-232 currently utilizes a printed thermal transfer label. This label will no longer be used and will be replaced by laser marking directly onto the housing of the product. The purpose for this change is to create a more durable solution, and eliminate the possibility of the label being inadvertently removed from the housing. | Download |
| EOL EDAC2 - PCN 1034 | 6/17/2013 | This PCN is a formal notification that US Digital is discontinuing the EDAC2. | Download |
Additional Information
Product Notes
- Cables and connectors are not included and must be ordered separately.
- US Digital® warrants its products against defects in materials and workmanship for two years. See complete warranty for details.
Downloads Available
DATASHEETS
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Product Configurator
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