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Name: AD790JR
Brand: Analog Devices Inc.
SKU: AD790JR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

Any Feature, including a modified Existing Feature, that is not an Existing Feature.

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Analog Devices Inc. AD790JR

Part No.:: AD790JR

Manufacturer:: Analog Devices Inc.

Package:: 8-SOIC (0.154, 3.90mm Width)

Datasheet:

Description:: IC PREC COMPARATOR HS 8-SOIC

In Stock:: 3635

Quantity:: Add To Cart

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AD790JR Specifications

Package/Case:
8-SOIC (0.154, 3.90mm Width)
Packaging:
Tube,Tube
Series:
-
ProductStatus:
Obsolete
Type:
with Latch
NumberofElements:
1
OutputType:
CMOS, TTL
Voltage-SupplySingle/Dual(±):
4.5V ~ 7V, ±2.25V ~ 16.5V
Voltage-InputOffset(Max):
1.5mV @ 5V
Current-InputBias(Max):
5µA @ 5V
Current-Output(Typ):
-
Current-Quiescent(Max):
10mA
CMRRPSRR(Typ):
95dB CMRR, 90dB PSRR
PropagationDelay(Max):
50ns
Hysteresis:
500µV
OperatingTemperature:
0°C ~ 70°C
MountingType:
Surface Mount

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AD790JR information

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AD790JR Typical application Circuitry

AD790JR

Well-known for its short reaction time and low input offset voltage, the AD790JR is a fast, precision voltage comparator. Its dual or single power supply operation makes it adaptable to a wide range of applications. Applications requiring high speed and precision will benefit from the AD790JR's TTL/CMOS compatible outputs and broad operating temperature range.

Application Scenario: Overvoltage Protection Circuit in Power Supply Units

In power supply units, the AD790JR can be used as an overvoltage protection circuit to detect and respond to voltage levels exceeding the safe operating range, thereby protecting the load and the power supply.

Circuit Design for Overvoltage Protection

1. Power Supply Configuration:

- Connect the V+ pin (pin 8) of the AD790JR to a positive power supply (e.g., +15 V).

- Connect the V- pin (pin 4) to a negative power supply (e.g., -15 V) or ground for single supply operation.

- To stabilize the power supply and cut down on noise, place decoupling capacitors (0.1 µF ceramic) close to the power supply pins.

2. Voltage Reference Setup:

- Connect a precision voltage reference (e.g., 5 V) to the inverting input (IN-) pin (pin 2) to set the threshold voltage for overvoltage detection.

3. Input Voltage Monitoring:

- Connect the output voltage of the power supply to be monitored to the non-inverting input (IN+) pin (pin 3) through a voltage divider network to scale the voltage within the input range of the AD790JR.

4. Output Configuration:

- Connect a pull-up resistor (e.g., 10 kΩ) from the output (OUT) pin (pin 6) to the positive power supply to ensure proper logic levels for the TTL/CMOS-compatible output.

- Connect the output (OUT) pin to the control circuit or shutdown mechanism of the power supply to initiate protection actions when an overvoltage condition is detected.

5. Hysteresis Implementation:

- Add a feedback resistor between the output (OUT) pin and the non-inverting input (IN+) pin to introduce hysteresis, preventing oscillations due to noise at the threshold voltage.

Key Design Considerations:

- Voltage Scaling: Ensure proper scaling of the monitored voltage to fall within the input range of the AD790JR while maintaining detection accuracy.

- Hysteresis: Implement hysteresis to improve noise immunity and prevent false triggering near the threshold voltage.

- Power Supply Decoupling: Use decoupling capacitors near the power supply pins to ensure stable operation and reduce noise coupling.

- Protection Response: Design the protection response mechanism to quickly and effectively isolate or shut down the power supply in case of overvoltage.

In this application, the AD790JR comparator serves as an effective overvoltage protection circuit in power supply units, providing fast and accurate detection of voltage levels exceeding the safe operating range. By addressing key design considerations such as voltage scaling, hysteresis, power supply decoupling, and protection response, designers can create a reliable and high-performance overvoltage protection circuit to safeguard power supplies and connected loads.

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6. What is the process for return or replacement of AD790JR?

All goods will implement Pre-Shipment Inspection (PSI), selected at random from all batches of your order to do a systematic inspection before arranging the shipment. If there is something wrong with the AD790JR we delivered, we will accept the replacement or return of the AD790JR only when all of the below conditions are fulfilled:

(1)Such as a deficiency in quantity, delivery of wrong items, and apparent external defects (breakage and rust, etc.), and we acknowledge such problems.

(2)We are informed of the defect described above within 90 days after the delivery of AD790JR.

(3)The PartNo is unused and only in the original unpacked packaging.

Two processes to return the products:

(1)Inform us within 90 days

(2)Obtain Requesting Return Authorizations