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Analog Devices Inc. AD790JRZ
- Part No.:
- AD790JRZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Comparators
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AD790JRZ.pdf
- Description:
- IC COMPARATOR 1 W/LATCH 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:916
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Product details
Overview
AD790JRZ from Analog Devices is a fast, precision voltage comparator with 45 ns max propagation delay, single 5 V or dual ±15 V supply operation, CMOS/TTL-compatible latched output, 250 µV max input offset voltage, and onboard latch functionality-used in zero-crossing detection, overvoltage monitoring, and precision rectifier circuits.
For engineers reviewing the AD790JRZ datasheet, AD790JRZ pinout, AD790JRZ application, or AD790JRZ equivalent, key selection considerations include latch timing (tS = 5–10 ns, tH = 25–35 ns), input hysteresis (0.3–0.65 mV), symmetric rail-to-rail output swing referenced to VLOGIC and GND, and SOIC_N (R-8) package compatibility with surface-mount production.
Technical Context
The AD790JRZ implements a complementary bipolar (CB) process architecture enabling simultaneous high speed (45 ns propagation delay) and precision (1 mV max input offset). Its output stage uses controlled switching between PNP pull-up and NPN pull-down transistors to eliminate current spikes and minimize supply-induced oscillations.
It features separate analog (+VS/–VS) and logic (VLOGIC) supply domains, allowing flexible configurations including single 5 V (VLOGIC = +VS = 5 V) or dual ±15 V with independent VLOGIC = 5 V. Input common-mode range extends to ground in single-supply mode and supports ±15 V differential input voltage in dual-supply mode.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Propagation Delay | 45 ns max (100 mV step, 5 mV overdrive); enables sub-22 MHz signal edge detection in timing-critical systems. |
| Input Offset Voltage | 1.0 mV max (typical 0.2 mV); ensures accurate threshold detection for low-level signals down to ~10 mV. |
| Hysteresis Voltage | 0.65 mV max (TMIN to TMAX); prevents chatter on slow-moving or noisy inputs without external components. |
| Supply Range | Single 4.5–7 V or dual ±15 V; supports industrial and legacy systems with mixed supply rails. |
| Output Compatibility | CMOS/TTL logic levels (VOH ≥ 4.3 V, VOL ≤ 0.5 V at 6.4 mA); drives standard logic gates directly without level-shifting. |
| Latch Function | Asynchronous latch via Pin 5 (VIH = 1.6 V, VIL = 0.8 V); holds output state during sampling windows in synchronous data acquisition. |
| Power Dissipation | 60 mW (single supply) / 242 mW (dual supply); low thermal load simplifies board layout in dense analog-digital interfaces. |
Pinout & Package
AD790JRZ is packaged in an 8-lead SOIC_N (R-8) RoHS-compliant surface-mount package per JEDEC MS-012-AA, measuring 5.00 mm × 4.00 mm × 1.50 mm with 1.27 mm lead pitch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - OUTPUT | Digital output | CMOS/TTL-compatible active-high or active-low logic output; swing referenced to VLOGIC and GND. |
| 2 - LATCH | Asynchronous latch control | Active-low enable: pulls output into hold state when driven ≤0.8 V; requires VIH ≥1.6 V to release. |
| 3 - GROUND | Analog and digital reference | Common return path for –VS (in dual supply) and VLOGIC; must be tied to system ground plane. |
| 4 - VLOGIC | Logic supply rail | Provides 5 V reference for output stage; must be ≥ (–VS + 0.5 V) and ≤7 V; decoupling with 0.1 µF ceramic required. |
| 5 - +VS | Analog positive supply | Accepts +5 V (single) or +15 V (dual); minimum +4.5 V; connects to bypass capacitor adjacent to pin. |
| 6 - +IN | Non-inverting input | High-impedance (202 MΩ) differential input; accepts common-mode voltages from 0 V to +VS–2 V (single) or –VS to +VS–2 V (dual). |
| 7 - –IN | Inverting input | Matches +IN in impedance and voltage range; differential input voltage limited to ±15 V max. |
| 8 - –VS | Analog negative supply | Ground (0 V) in single supply; –15 V in dual supply; must not exceed 0 V in single-supply configuration. |
Key Features
| Feature | Design Value |
|---|---|
| Low-glitch output stage | Eliminates current spikes between output transistors, reducing supply noise coupling and preventing false triggering in sensitive analog front-ends. |
| Ground-referenced inputs (single supply) | Enables direct interface to 0 V–referenced sensors or signals without level-shifting circuitry-unavailable in most comparators. |
| Built-in hysteresis | 0.3–0.65 mV internal hysteresis reduces susceptibility to noise-induced oscillation on slowly varying inputs like temperature ramps or motor feedback. |
| Wide differential input range | ±15 V max differential input allows direct connection to high-amplitude signals (e.g., ±10 V DAC outputs or op amp rails) without external clamping diodes. |
| Separate VLOGIC supply | Decouples logic-level output drive from analog supply rails, enabling clean interfacing to 3.3 V or 5 V microcontrollers even when analog supplies are ±15 V. |
Applications
| Zero-Crossing Detection | Overvoltage Protection |
|---|---|
Use Scenario: Monitoring AC line voltage to trigger TRIAC firing or synchronize digital sampling with waveform zero crossings. IC Role / Device Role / Timing Role: Precision comparator detecting transitions across 0 V with minimal delay and no chattering due to built-in hysteresis. Use Value: 45 ns propagation delay enables accurate phase alignment in 50/60 Hz systems; ground-referenced inputs simplify transformerless sensing. | Use Scenario: Safeguarding power supplies or battery packs by tripping shutdown circuitry when voltage exceeds safe thresholds. IC Role / Device Role / Timing Role: High-speed threshold detector comparing sensed rail voltage against a stable reference (e.g., bandgap). Use Value: ±15 V differential input range permits direct connection to high-voltage rails; latch function holds fault state until reset. |
| Precision Full-Wave Rectification | Delta-Sigma Modulator Feedback |
Use Scenario: Converting low-amplitude AC sensor signals (e.g., thermocouple, strain gauge) into DC for ADC input without distortion. IC Role / Device Role / Timing Role: Fast, low-offset comparator controlling FET switches in active rectifier topology. Use Value: 1 mV max offset preserves accuracy for mV-level inputs; 45 ns delay supports clean rectification up to ~1 MHz. | Use Scenario: Providing quantization decision in 1-bit delta-sigma modulators for high-resolution audio or measurement ADCs. IC Role / Device Role / Timing Role: Core 1-bit quantizer comparing integrator output against zero reference. Use Value: Low propagation delay variation (<5 ns over temperature) ensures stable loop timing; latch capability enables synchronous sampling of integrator state. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage comparator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM311DR | No internal latch; open-collector output requiring pull-up; 200 ns propagation delay; wider offset (7 mV max). | Suitable for basic threshold detection but lacks synchronous capture and speed for high-frequency modulation. | Choose LM311DR only when latch function and sub-50 ns response are unnecessary and cost is primary constraint. |
| TLV3501CDR | 3.5 ns propagation delay; rail-to-rail input; no internal hysteresis; 3.3 V/5 V single-supply only; no –VS pin. | Better for ultra-high-speed, low-voltage systems but cannot support dual ±15 V or latch-based sampling schemes. | Choose TLV3501CDR when >10× speed is critical and supply flexibility or latch functionality is not required. |
Compared with LM311DR and TLV3501CDR, the AD790JRZ uniquely balances speed (45 ns), precision (1 mV offset), latch capability, and dual/single supply versatility-making it optimal for industrial signal conditioning where timing control and robustness coexist.
Availability
AD790JRZ is available at Aetrix Electronics and suitable for zero-crossing detectors, overvoltage monitors, and precision rectifiers requiring stable component supply across industrial design cycles.
Supply support for AD790JRZ includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Analog Devices is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, communications, automotive, and healthcare markets since 1965.
The AD790JRZ belongs to Analog Devices' precision comparator product line, engineered for applications demanding speed, accuracy, and robust interface capability in analog-to-digital signal chains and real-time protection circuits.
FAQ
What is the maximum operating temperature range for the AD790JRZ?
The AD790JRZ is rated for the commercial temperature range of 0°C to +70°C. It is part of the AD790J grade, distinct from industrial (–40°C to +85°C) or military (–55°C to +125°C) variants. This rating is confirmed in the Ordering Guide and applies to all electrical specifications unless otherwise noted in the datasheet.
Does the AD790JRZ require external hysteresis components?
No, the AD790JRZ includes internal hysteresis of 0.3–0.65 mV (TMIN to TMAX), eliminating the need for external positive feedback resistors. This built-in feature stabilizes switching behavior on slow or noisy inputs-verified in the "HYSTERESIS" section and Specifications table under "Hysteresis" parameter.
Can the AD790JRZ operate from a single 3.3 V supply?
No-the AD790JRZ requires a minimum supply of 4.5 V in single-supply mode (VLOGIC = +VS), per the Absolute Maximum Ratings and Single Supply Specifications tables. Operation below 4.5 V is not guaranteed and may result in degraded performance or failure to meet VOH/VOL specs.
What is the purpose of the VLOGIC pin on the AD790JRZ?
The VLOGIC pin on the AD790JRZ supplies the logic-level output stage independently from the analog supply rails. It sets the high/low output voltage references (VOH/VOL) and must be 5 V (±0.5 V) for full TTL/CMOS compatibility. This separation enables clean interfacing to digital controllers even when analog supplies are ±15 V.
Is the AD790JRZ pin-compatible with other AD790 variants like AD790JN or AD790JR?
Yes-the AD790JRZ shares identical pinout and electrical functionality with AD790JN (PDIP) and AD790JR (SOIC_N), differing only in packaging (R-8 SOIC_N, RoHS-compliant) and reel format. All share the same connection diagram, timing parameters, and absolute maximum ratings per the datasheet's Connection Diagrams and Ordering Guide.
AD790JRZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Series:
- -
- Packaging:
- Tube
- Product Status:
- Active
- Type:
- with Latch
- Number of Elements:
- 1
- Output Type:
- CMOS, TTL
- Voltage - Supply, Single/Dual (±):
- 4.5V ~ 7V, ±2.25V ~ 16.5V
- :
- 1.5mV @ 5V
- Voltage - Input Offset (Max):
- 5µA @ 5V
- Current - Input Bias (Max):
- -
- Current - Output (Typ):
- 10mA
- Current - Quiescent (Max):
- 95dB CMRR, 90dB PSRR
- CMRR, PSRR (Typ):
- 50ns
- Propagation Delay (Max):
- 500µV
- Hysteresis:
- 0°C ~ 70°C
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- Surface Mount
- :
- 8-SOIC
AD790JRZ FAQ
1.How can I place an order for AD790JRZ through Aetrix?
Please submit a Request for Quotation (RFQ) for AD790JRZ on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for AD790JRZ reliable?
The price and inventory of AD790JRZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD790JRZ is usually 5 days.
3.What payment methods are accepted for AD790JRZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD790JRZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD790JRZ?
AD790JRZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD790JRZ order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for AD790JRZ?
For technical support, including AD790JRZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD790JRZ requirements.
6.How does Aetrix verify that AD790JRZ is sourced from the original manufacturer or authorized distributors?
All AD790JRZ products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that AD790JRZ meets industry standards.
7.What is the process for return or replacement of AD790JRZ?
All AD790JRZ units undergo pre-shipment inspection (PSI). If there is an issue with AD790JRZ, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The AD790JRZ part is unused and in its original packaging.
Return procedure for AD790JRZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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