Features

conforms to ROHS, 16 lead, QSOP packaging; low power operation: 5V; the maximum of each channel is 1.2 mAh@0 Mbps to 2 Mbps; : 105 ° C; data rate (NRZ) of up to 10 Mbps; low default output status; 1000 V RMS isolation rated value; safety and regulatory approval (to be determined); UL recognition; 1000 V RMS, 1 minute per UL 1577.

Application

General, unidirectional, multi -channel isolation.

General description

ADUM7510 is a one -way 5 -channel isolation device based on the simulation equipment company iCouper technology. Compared with ADUM1510, the Adum7510 has a lower isolation level, which provides a choice of reducing costs for acceptable applications that can accept 1KV communication. Combined with high -speed CMOS and single -piece hollow transformer technology, these isolation components provide excellent performance of superior alternative devices such as optocoupled device.

By avoiding the use of LED and optoelectronics diode, the iCoupler device eliminates design difficulties related to optocoupler. With simple photoelectric coupling numbers eliminy the incomplete current transmission ratio, non -linear transmission function, temperature and life effects such as typical photoelectric coupling problems and stable performance characteristics. These iCoupler products have eliminated demand for external drivers and other discrete components. In addition, the iCoupler device runs at a tenth to one -sixth of the power consumption of the power consumption of the optical coupler at a comparison signal data rate.

ADUM7510 isolation device provides five independent isolation channels and supports data rates up to 10 Mbps. Each side works with a power supply voltage of 4.5 V to 5.5 V. Different from other optocouplers, the Adum7510 isolates has a patented refresh function to ensure that the DC accuracy of DC is not under the condition of input logic conversion and power -off/power off conditions.

Typical performance features

ADUM7510 Digital isolation does not require an external interface circuit of logical interface. It is strongly recommended to set up a power sources at the foot of the input and output power supply (see Figure 9). For V, the bypass container is most convenient to connect between pin 1 and pin 2 and between pins 15 and pin 16. The capacitor value should be between 0.01 μF and 0.1 μF. The length of the total leading lead between the two ends of the capacitor and the input power pins should not exceed 10 mm. It should also be considered between pinna 1 and needle 8 and needle 9 and pinnacle 16, unless the grounding side of each packaging side is connected near the packaging.

The circuit board layout guide is seen in the AN-1109 application description.

Displaying related parameters

Display delay is the parameter of the time length required by the description logic signal to spread through the component. The transmission delay to the logic low output can be different from the transmission delay to the logic high.

The pulse width distortion is the biggest difference between the two propagation delay values.

Channel -to -channel matching refers to the maximum difference between transmission between channels between channels in a single Adum7510 component.

The delay deviation of the communication refers to the maximum difference between the delay between the propagation delay between multiple ADUM7510 components operated under the same conditions.

DC correctness and magnetic field resistance

The positive and negative logic conversion of the input terminal of the isolator inputs the narrow pulse (about 1NS) sent to the decoder through a transformer. The decoder is dual -stable, so you can set or reset the pulse of the input logic conversion. When the input terminal does not have a logical conversion of more than ~ 1 μs, the periodic refresh pulse set of the correct input state of the sending input state is sent to ensure the correctness of the output end.

If the decoder does not receive more than 5 μs pulse, it is assumed that the input side is not electrical or non -functional. In this case, the barrier output is forced to the default low state by looking at the timer circuit of the door dog.

The limit of the device's magnetic field resistance is set by the induction voltage in the transformer to receive the incorrect setting or resetting the condition of the decoder. The following analysis defines these conditions. Adum7510 is checked under the working conditions of 4.5V because it represents the most affected working mode of this product.

The pulse amplitude of the transformer output place is greater than 1.5 V. The inductive threshold of the decoder is about 1.0 V, thereby establishing a mapping of 0.5 V, which can tolerate the induction voltage. By receiving the voltage of the coil induction:

: β is the magnetic flux density.

RN is the radius of the nn ring receiving coil.

N is the number of turns for receiving coils.

Considering the geometric structure of receiving coils in ADUM7510, and requiring the inductive voltage to be up to 50%of the decoder 0.5V edges, calculating the maximum allowed magnetic field, as shown in Figure 11.

For example, at a magnetic field frequency of 1 MHz, a maximum allowed magnetic field of 0.5 kgauss to generate a voltage of 0.25 V at the receiving coil. This is about 50%of the inductive threshold, which will not cause error output conversion. If such incidents occur with the worst polarity during the pulse period, the receiving pulse will be from gt; 1.0 V was reduced to 0.75 V, which is still much higher than the 0.5 V sensing threshold of the decoder.

The above -mentioned magnetic flux density value corresponds to a specific current amplitude value at a given distance from the ADUM7510 transformer. FIG. 12 represents the amplitude of these allowable current as the frequency function of the selected distance. Adum7510 is very sensitive to the outer area. Only a very large high -frequency current can become a potential problem. For the 1 MHz example, the 1.2 kA current must be placed in a position from the Adum7510 5 mm to affect the component operation.

Note that under the combination of strong magnetic fields and high -frequency, any loop formed by the PCB trajectory will generate sufficient large error voltage, thereby triggering the threshold of the subsequent circuit. Pay attention to avoid forming the PCB structure of the circuit.

Power consumption

The power supply current on the given channel of the ADUM7510 isolator is a function of the power supply voltage, channel data rate, and channel output load.

For each input channel, the power supply current consists of:

For each output channel, the power current is:

Among them: IDDI (D), IDDO (D) is the input and output dynamic power supply current per channel (MA/Mbps).

CL is an output load capacitor (PF).

VDDO is the output power supply voltage (V).

f is the input logic signal frequency (MHz, half of the input data rate, NRZ signaling).

FR is the refresh rate (MBPS) in the input stage.

IDDI (Q), IDDO (Q) is the specified input and output static power current (MA).

In order to calculate the total I and i power currents, calculate and summarize the power supply corresponding to each input and output channel corresponding to I and I. Figure 4 and Figure 5 provide a function of the power supply of each channel as a function of the data rate under the condition of the air load. FIG. 6 provides a passing channel for the data rate function under 15 PF output conditions. Figure 7 and 8 provide the total I and I power currents of the data rate function of the ADUM7510 product data rate function. DD1 Di DD1 Dd1 Dd1 Ddd1 Time

Power -off -cutting precautions

During the power -powered and power -off operation, ADUM7510's behavior meets the requirements of Table 8. However, when the power supply is lower than the minimum operating voltage but the internal circuit is not completely disconnected, the parts may transmit incorrect data.

At the V voltage close to the working threshold of 1.9V, an electrical/lower power error may occur. The encoder generates data pulse under low amplitude. The detector may miss the approachDetect the data pulse of the threshold.If the transmission state is a logical high level, the encoder generates a pair of pulses; the decoder can reject one of the low -amplitude pulses.A single pulse is explained as low logic and the output may be in the wrong logic state where the refresh cycle.

Following these suggestions can achieve non -failure operations.

connect or disconnect the power as soon as possible.

Use the default low working mode to keep the low input until the power supply is stable.

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