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Texas Instruments LMH7322SQ/NOPB
- Part No.:
- LMH7322SQ/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Comparators
- Package:
- 24-WFQFN Exposed Pad
- Datasheet:
-
LMH7322SQ/NOPB.pdf
- Description:
- IC COMPARATOR 2 GEN PUR 24WQFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,897
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Product details
Overview
LMH7322SQ/NOPB from Texas Instruments is a dual high-speed comparator with 700 ps propagation delay, 75 ps overdrive dispersion, and RSPECL-compatible outputs referenced to VCCO. It operates from 2.7V to 12V supply range, supports input common-mode voltage down to VEE−0.2V, and delivers 160 ps rise/fall times. It is used in digital receivers and high-speed signal triggering where sub-nanosecond timing precision and noise-immune differential output are required.
For engineers reviewing the LMH7322SQ/NOPB datasheet, LMH7322SQ/NOPB pinout, LMH7322SQ/NOPB application, or LMH7322SQ/NOPB equivalent, key selection criteria include propagation delay stability across supply voltage (2.7–12V), latch-enable timing (tsLE = 95 ps, thLE = 29 ps at 5V), RSPECL/LVDS output compatibility via VCCO configuration, and adjustable hysteresis using external RHYS resistor.
Technical Context
The LMH7322SQ/NOPB integrates two independent comparators, each with fully differential RSPECL outputs and complementary latch-enable inputs (LE/LE). Its input stage accepts common-mode voltages extending 200 mV below VEE, enabling ground-referenced sensing in single-supply configurations. The output stage uses emitter-follower topology referenced to VCCO, supporting termination to VT = VCCO−2V or direct connection to VEE via external resistors.
Propagation delay is tightly controlled across temperature (−40°C to +125°C) and supply voltage, with dispersion limited to 75 ps over 20 mV–1 V overdrive. Input hysteresis is externally adjustable via RHYS (0 Ω to 32 kΩ), yielding 25–75 mV hysteresis voltage. Latch functionality provides transparent or latched output behavior synchronized to LE transitions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Propagation Delay | 708 ps typical at 100 mV overdrive (5V supply); enables ≤260 ps minimum pulse width detection. |
| Overdrive Dispersion | 75 ps max (20 mV ↔ 100 mV); ensures consistent timing across varying input step amplitudes. |
| Output Rise/Fall Time | 160 ps (20%–80%, 5V); supports >3.9 Gb/s toggle rate for high-speed serial interface sampling. |
| Input Common-Mode Range | VEE−0.2 V to VCCI−1.5 V; allows direct sensing of signals referenced to ground under single 2.7V–12V supply. |
| Hysteresis Voltage | 25–75 mV (RHYS = 0–32 kΩ); prevents oscillation on slow or noisy input edges without internal fixed threshold. |
| Supply Voltage Range | 2.7V to 12V (VCCI–VEE); permits interoperability between LVDS (VCCO = 2.5V), PECL (VCCO = 5V), and ECL (VEE = −5.2V) domains. |
| Operating Temperature | −40°C to +125°C; qualified for industrial and automotive control subsystems with extended thermal margins. |
Pinout & Package
The LMH7322SQ/NOPB is housed in a 24-pin WQFN package (4 mm × 4 mm, 0.5 mm pitch) with exposed thermal pad. Pin numbering follows standard counter-clockwise layout starting from top-left corner (Pin 1 marked).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 5, 6 | INA+, INA−, RHYSA, RHREFA, INB+, INB− | Differential analog inputs and hysteresis reference for Channel A/B; RHREF sets hysteresis center point. |
| 7, 8, 9, 10, 11, 12 | RHYSB, VEEA, VCCIA, LEA, LEA, VCCOA | Channel B hysteresis control, negative rail, input-stage supply, latch enable pair, and output-stage supply. |
| 13, 14, 15, 16, 17, 18 | QA, QA, VCCOA, VCCOB, QB, QB | Complementary RSPECL outputs for both channels; dual VCCO pins allow independent output supply routing. |
| 19, 20, 21, 22, 23, 24 | VEEB, VCCIB, LEB, LEB, VCCIA, VCCIB | Second set of supply and latch-enable terminals; supports split-supply operation with isolated channel biasing. |
Key Features
| Feature | Design Value |
|---|---|
| RSPECL/LVDS-compatible outputs | VOH = VCCO−1.1 V, VOL = VCCO−1.5 V; 400 mV swing enables direct interfacing to LVDS receivers when VCCO = 2.5 V. |
| Adjustable hysteresis | 25–75 mV range via external RHYS resistor (0–32 kΩ); eliminates need for external Schmitt-trigger circuitry. |
| Wide input common-mode range | Extends 200 mV below VEE; supports single-supply ground-sensing applications without level-shifting components. |
| Latch-enable with precise timing | tsLE = 95 ps, thLE = 29 ps (5V); enables synchronous sampling of high-speed data streams with minimal setup/hold overhead. |
| Low dispersion architecture | 75 ps overdrive dispersion + 48 ps slew-rate dispersion; preserves signal integrity in multi-amplitude edge detection. |
| Thermally enhanced WQFN | θJA = 38°C/W; supports continuous operation at full speed up to +125°C ambient with standard PCB copper pour. |
Applications
| Digital Receiver Front-End | High-Speed Sampling System |
|---|---|
|
Use Scenario: Recovering NRZ data from optical or RF baseband channels with jitter-sensitive clock recovery. IC Role / Device Role / Timing Role: Dual-channel comparator acting as decision circuit with sub-ns propagation delay and latch synchronization to recovered clock. Use Value: 708 ps typical tPD and 75 ps dispersion maintain bit-error-rate integrity at >3.9 Gb/s data rates under varying overdrive conditions. |
Use Scenario: Capturing transient events in test equipment or radar pulse detection with precise time-of-arrival resolution. IC Role / Device Role / Timing Role: High-speed zero-crossing detector feeding into FPGA-based timestamp logic with latch-enable edge alignment. Use Value: 29 ps hold time and 95 ps setup time on LE inputs ensure deterministic capture of <260 ps pulses without metastability risk. |
| Window Comparator for Power Monitoring | LVDS Signal Restoration |
|
Use Scenario: Monitoring DC bus voltage in motor drives to trigger fault shutdown when exceeding safe upper/lower thresholds. IC Role / Device Role / Timing Role: Dual comparator configured as window detector with independently adjustable hysteresis per threshold via RHYS resistors. Use Value: Adjustable 25–75 mV hysteresis prevents chatter during slow-rising/falling bus transients while maintaining fast response to hard faults. |
Use Scenario: Reconditioning degraded LVDS signals after long PCB traces or backplane interconnects with loss-induced jitter. IC Role / Device Role / Timing Role: RSPECL-output comparator restoring signal amplitude and edge fidelity while suppressing common-mode noise on differential pairs. Use Value: Complementary outputs provide >60 dB CMRR, and 160 ps rise/fall times restore eye opening in >1 Gb/s links with >500 fs RMS jitter. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-speed comparator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LMH7324MTX/NOPB | Quad-channel version in 32-pin WQFN; identical per-channel specs but higher total supply current (IVCCI = 24 mA/ch). | Required when four independent high-speed comparisons are needed in same footprint-constrained space. | Select LMH7324MTX/NOPB only if quad-channel density justifies added power and routing complexity. |
| ADCMP572BCPZ-REEL7 | 750 ps tPD, 35 ps dispersion, ECL outputs; requires −5.2V/−4.5V dual supply; no latch-enable function. | Suitable for ultra-low-jitter clock/data retiming where latch synchronization is unnecessary. | Choose ADCMP572BCPZ-REEL7 only for fixed ECL systems needing lowest possible dispersion, not for RSPECL/LVDS flexibility. |
Compared with LMH7322SQ/NOPB, LMH7324MTX/NOPB offers channel count scalability at cost of higher quiescent current and larger package, while ADCMP572BCPZ-REEL7 trades latch capability and supply flexibility for marginally lower dispersion in legacy ECL environments.
Availability
LMH7322SQ/NOPB is available at Aetrix Electronics and suitable for digital receiver front-ends, high-speed sampling systems, and LVDS signal restoration requiring stable component supply across industrial temperature ranges and long production lifecycles.
Supply support for LMH7322SQ/NOPB 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
Texas Instruments is a global semiconductor leader specializing in analog and embedded processing technologies, with decades of expertise in high-speed signal conditioning and precision timing solutions.
The LMH7322SQ/NOPB belongs to TI's LMH high-speed comparator product line, designed specifically for gigabit-per-second data acquisition, optical interconnect, and test-and-measurement instrumentation demanding sub-nanosecond timing accuracy and robust noise immunity.
FAQ
What is the minimum operating supply voltage for LMH7322SQ/NOPB?
The LMH7322SQ/NOPB operates from a minimum supply voltage of 2.7V (VCCI–VEE). At this voltage, it maintains 713 ps typical propagation delay and 265 ps minimum pulse width capability, verified per the 2.7V AC Electrical Characteristics table in the official datasheet. This low-voltage operation enables integration into battery-powered or energy-efficient high-speed systems without sacrificing timing performance. The LMH7322SQ/NOPB retains full RSPECL output compatibility and latch-enable functionality across the entire 2.7V–12V range.
How does the LMH7322SQ/NOPB support LVDS interfacing?
The LMH7322SQ/NOPB supports LVDS interfacing by setting VCCO to 2.5V, which configures its RSPECL outputs to deliver VOH = 1.4 V and VOL = 1.0 V - matching LVDS receiver thresholds. Its 355 mV typical output differential voltage (VOD) exceeds the 250 mV LVDS minimum, and complementary Q/Q outputs inherently reject common-mode noise. No external level-shifting circuitry is required, making the LMH7322SQ/NOPB a drop-in solution for LVDS signal restoration in FPGA I/O banks or serializer-deserializer interfaces.
Can LMH7322SQ/NOPB operate with a single positive supply?
Yes, the LMH7322SQ/NOPB supports true single-supply operation with VEE tied to ground. Its input common-mode range extends to VEE−0.2V, allowing ground-referenced signal detection, and its RSPECL outputs remain functional when VCCO is biased above ground (e.g., 2.5V or 3.3V). The device draws IVCCI = 6.3 mA and IVCCO = 15.8 mA per channel at 5V single supply, and all timing specifications - including 718 ps propagation delay and 95 ps latch setup time - are guaranteed under this configuration per the 5V Electrical Characteristics tables.
What is the purpose of the RHREF pin on LMH7322SQ/NOPB?
The RHREF pin on LMH7322SQ/NOPB sets the center reference voltage for the adjustable hysteresis function. When an external resistor connects RHREF to a stable voltage (e.g., mid-supply), it establishes the switching threshold midpoint around which hysteresis is symmetrically applied via RHYS. This enables precise window-based detection without external op-amps or comparators. For example, with RHREF = 1.25V and RHYS = 10 kΩ, the LMH7322SQ/NOPB achieves ~50 mV hysteresis centered at 1.25V - critical for noise-immune power rail monitoring or sensor thresholding.
Does LMH7322SQ/NOPB require external termination resistors?
Yes, the LMH7322SQ/NOPB requires external termination to achieve specified RSPECL output performance. For 50 Ω transmission lines, a 50 Ω resistor must connect each output (Q or Q) to VT = VCCO−2V. Alternatively, outputs can terminate to VEE via calculated emitter resistors (e.g., 400 Ω to −5V when VCCO = 2.5V), trading power efficiency for reduced component count. These termination methods are explicitly defined in Figure 18 and Application Information section of the LMH7322SQ/NOPB datasheet, and omission causes signal reflection and degraded timing margins.
LMH7322SQ/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- 24-WFQFN Exposed Pad
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- General Purpose
- Number of Elements:
- 2
- Output Type:
- Differential, LVDS, RSPECL
- Voltage - Supply, Single/Dual (±):
- 2.7V ~ 12V, ±1.35V ~ 6V
- :
- 8mV @ 5V
- Voltage - Input Offset (Max):
- 5µA @ 5V
- Current - Input Bias (Max):
- 25mA
- Current - Output (Typ):
- 10mA
- Current - Quiescent (Max):
- 80dB CMRR, 80dB PSRR
- CMRR, PSRR (Typ):
- 0.783ns
- Propagation Delay (Max):
- 75mV
- Hysteresis:
- -40°C ~ 125°C
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- Surface Mount
- :
- 24-WQFN (4x4)
LMH7322SQ/NOPB FAQ
1.How can I place an order for LMH7322SQ/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LMH7322SQ/NOPB 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 LMH7322SQ/NOPB reliable?
The price and inventory of LMH7322SQ/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMH7322SQ/NOPB is usually 5 days.
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We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMH7322SQ/NOPB transactions.
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LMH7322SQ/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMH7322SQ/NOPB 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 LMH7322SQ/NOPB?
For technical support, including LMH7322SQ/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMH7322SQ/NOPB requirements.
6.How does Aetrix verify that LMH7322SQ/NOPB is sourced from the original manufacturer or authorized distributors?
All LMH7322SQ/NOPB 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 LMH7322SQ/NOPB meets industry standards.
7.What is the process for return or replacement of LMH7322SQ/NOPB?
All LMH7322SQ/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LMH7322SQ/NOPB, 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 LMH7322SQ/NOPB part is unused and in its original packaging.
Return procedure for LMH7322SQ/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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