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Integrated CircuitsData Sheet
ET9570LH3 CHANNEL DIFFERENTIAL AMPLIFIER-COMPARATOR ET9570LH(Lower hysteresis than original version) FEATURES
APPLICATIONS
DESCRIPTIONThese devices are specifically designed as receiver circuits for the photodiode signals available in optical encoders. Connect the anode of the photodiodes to the input pins, with the cathode(s) connected to Vcc for reverse-bias operation. The input amplifiers have a dynamic range of nearly 1000:1, and allow contrast ratios of encoded signal to common mode signal of as low as 2:1. Differential inputs enhance noise rejection and performance over temperature. Gating of the Z channel provides synchronization of the reference pulse to the data channel phasing. Hysteresis ratio of comparators is 1.1:1, instead of the 1.25:1 on the previous version. 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 |
|---|---|---|---|---|---|---|
| Supply Current | Icc1 Icc2 |
4.5 5.0 |
7.2 8.0 |
11.5 12.5 |
mA | Vcc = 4.5 V Vcc = 30.0V |
| Input Common Mode Voltage | VCM | - | 1.35 | - | V | - |
| Average Photocurrent Input | IIA | 0.066 | 0.3 | 40 | A | Each input |
| Peak Photocurrent Input | IIP | 0.13 | 0.5 | 60 | A | Each input |
| Dark Cell Level | IID | 0.02 | 0.1 | 20 | A | Each input |
| Photocurrent Contrast Ratio | IIR | 2:1 | 5:1 | - | - | Peak:Dark Cell |
| Comparator Threshold | - | - | 1.1:1 | - | - | Ratio of Differential Inputs |
| Output High Level Voltage | VOH | 2.5 28.0 |
3.0 28.5 |
- | V | IOH = -4mA,
VCC = 4.5VCC = 4.5V-30V IOL = 8mA IOH = -4mA,VCC = 30V |
| Output Low Level Voltage | VOL | - | 199 | 400 | 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 |
|---|---|---|---|---|---|---|
| Pre-Amplifier Bandwidth | BWPA | - | 900 | - | KHz | Photocurrent = 1µA Minimum |
| Propagation delay from Comparator Input to Output | TPD | - | 850 | - | ns | - |
| Output Rise Time | TR | - | 100 | - | ns | - |
| Output Fall Time | TF | - | 20 | - | ns | - |
NOTES:
1. This is not a test parameter, but for information only.
| 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.
