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Integrated CircuitsData Sheet
ET95713 CHANNEL DIFFERENTIAL AMPLIFIER-COMPARATOR(Similar to the 9570 but intended for phototransistor inputs.) FEATURES
APPLICATIONS
DESCRIPTIONThese devices are specifically designed as receiver circuits for the phototransistor signals available in some optical encoders. Connect the emitters of the phototransistors to the input pins, with the collectors connected to Vcc. The inputs have 330 ohm resistors to terminate the phototransistors in an emitter follower mode. Differential inputs enhance noise rejection and performance over temperature. Care should be taken to use phototransistors on differential input pairs which have similar values of DC leakage current, as large differences in this charactersitic will affect waveform symmetry. ABSOLUTE MAXIMUM RATINGS
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| Parameter | Symbol | Min. | Max. | Units | Ref. |
|---|---|---|---|---|---|
| Operating Temperature Range | TA | -40 | 125 | °C | Note 1 |
| Supply Voltage Range | VCC | 4.5 | 30 | V | - |
ELECTRICAL CHARACTERISTICS
Unless otherwise specified, typical values given at VCC=12V, TA = 25°C, with LED and RSET open.
| Parameters | Symbol | Min. | Typ. | Max. | Units | Test Conditions |
|---|---|---|---|---|---|---|
| High Level Supply Current | ICCH1 ICCH2 |
4.0 4.5 |
6.7 7.5 |
11.0 12.0 |
mA | Vcc = 4.5 V Vcc = 30.0V |
| Peak Photocurrent Input | IIP | 0.3 | 0.5 | 15 | mA | Note 2 |
| Dark Cell Level | IID | 0.0 | 0.05 | 7.5 | mA | - |
| Photocurrent Contrast Ratio | IR | 2:1 | - | - | - | Peak:Dark Cell |
| Hysteresis at Comparator Inputs | IH | 6 | 11 | 20 | mV | - |
| Output High Level Voltage | VOH | 2.5 28.0 |
3.0 28.5 |
- | V | IOH = -4mA,VCC = 4.5V IOH = -4mA,VCC = 30V |
| Output Low Level Voltage | VOL | - | 199 | 199 | mV | VCC = 4.5V-30V IOL = 8mA |
| Output Short-Circuit Current Driving High (All Outputs) | IOS | 15 | 25 | 50 | mA | VCC = 5V, VOUT = 0V |
| Output Short-Circuit Current Driving Low (All Outputs) | IOS | 30 | 70 | 120 | mA | VCC = 5V, VOUT = 5V |
| RSET Voltage | VRSET | 1.3 | 1.7 | 2.1 | V | R = 180 ohms |
AC SWITCHING CHARACTERISTICS
Values given at VCC = 5V, TA = 25°C, CL = 15pF on all outputs.
| Parameters | Symbol | Min. | Typ. | Max. | Units | Test Conditions |
|---|---|---|---|---|---|---|
| Propagation delay from Comparator Input to Output | TPD | - | 850 | - | ns | - |
| Output Rise Time | TR | - | 100 | - | ns | - |
| Output Fall Time | TF | - | 20 | - | ns | - |
NOTES:
- This is not a test parameter, but for information only.
- Higher signal levels can be handled by adding resistors from the inputs to ground.
| PACKAGE | SUFFIX |
|---|---|
| Chip Only | -C |
| 16 Lead SOIC | -SOP |
ETIC RESERVES THE RIGHT TO MAKE CHANGES AT ANY TIME TO IMPROVE THE DESIGN AND TO SUPPLY THE BEST PRODUCT.
