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Texas Instruments LMH7322SQE/NOPB
- Part No.:
- LMH7322SQE/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Comparators
- Package:
- 24-WFQFN Exposed Pad
- Datasheet:
-
LMH7322SQE/NOPB.pdf
- Description:
- IC COMPARATOR 2 GEN PUR 24WQFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,969
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Product details
Overview
LMH7322SQE/NOPB from Texas Instruments is a dual high-speed comparator with 700 ps propagation delay, 75 ps overdrive dispersion, and RSPECL-compatible outputs. It operates from 2.7 V to 12 V supply rails, supports input common-mode voltage down to VEE − 0.2 V, and delivers 160 ps rise/fall times. It is used in digital receivers and high-speed signal restoration where precise timing and noise-immune differential signaling are critical.
For engineers reviewing the LMH7322SQE/NOPB datasheet, LMH7322SQE/NOPB pinout, LMH7322SQE/NOPB application, or LMH7322SQE/NOPB equivalent, key selection criteria include propagation delay stability across supply voltages (2.7 V–12 V), latch-enable timing (tsLE = 95 ps, thLE = 29 ps), RSPECL output compatibility with adjustable termination, and dual-channel skew performance (ΔtPDLH ≤ 29 ps).
Technical Context
The LMH7322SQE/NOPB integrates two independent comparators with fully differential RSPECL outputs and separate latch-enable inputs per channel. Its input stage accepts common-mode voltages extending 200 mV below VEE and supports differential swings up to ±1 V, enabling ground-referenced sensing in single-supply configurations.
Each comparator features user-adjustable hysteresis via external RHYS resistor (25–75 mV range), and outputs are referenced to VCCO - allowing LVDS compatibility when VCCO = 2.5 V. The latch function operates synchronously with RSPECL-level LE/LE inputs and exhibits sub-1 ns latch-to-output delay (tPD_LE = 893 ps at 5 V).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Propagation Delay | 708 ps typical at 100 mV overdrive (5 V supply); enables sub-GHz sampling decision timing. |
| Overdrive Dispersion | 75 ps max (20 mV ↔ 100 mV); ensures consistent timing across input signal amplitudes. |
| Rise/Fall Time | 160 ps (20%–80%); supports >3.9 Gb/s toggle rate with minimal pulse distortion. |
| Input Common-Mode Range | VEE − 0.2 V to VCCI − 1.5 V; allows direct interface to ground-referenced sensors or DACs. |
| Output Type | RSPECL with VCCO-referenced swing (VOH = VCCO − 1.1 V, VOL = VCCO − 1.5 V); compatible with ECL, PECL, and LVDS (at VCCO = 2.5 V). |
| Supply Range | 2.7 V to 12 V (VCCI and VCCO independently configurable); supports mixed-voltage system interfacing. |
| Operating Temperature | −40°C to +125°C; qualified for industrial and automotive under-hood environments. |
Pinout & Package
LMH7322SQE/NOPB is housed in a 24-pin WQFN package (4 mm × 4 mm, 0.5 mm pitch) with exposed thermal pad. Pin assignments are validated per TI SNOSAU8I Rev. MARCH 2013.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| INA+, INB+ | Non-inverting input (Channel A/B) | Differential input pair accepting VCM down to VEE − 0.2 V; internal ESD protection with 250 Ω series resistors. |
| INA−, INB− | Inverting input (Channel A/B) | Complementary input for full differential operation; clamped to VEE–VCCI rail diodes. |
| QA, QB | True output (Channel A/B) | RSPECL emitter-follower output referenced to VCCO; requires external 50 Ω termination to VT = VCCO − 2 V or VEE. |
| QA, QB | Complementary output (Channel A/B) | 180° phase-inverted counterpart to QA/QB; enables common-mode noise rejection on transmission lines. |
| LEA, LEB | Latch enable (active-high, Channel A/B) | RSPECL-compatible control input; latches output state on rising edge with 95 ps setup time. |
| LEA, LEB | Inverted latch enable (Channel A/B) | Differential complement to LEA/LEB; required for noise-immune synchronous latching. |
| VCCI | Input-stage supply | Supplies comparator core; independent of VCCO; supports 2.7 V–12 V operation. |
| VCCO | Output-stage supply | Sets RSPECL output voltage levels (VOH/VOL); selectable for LVDS (2.5 V) or PECL (3.3 V/5 V) compatibility. |
| VEE | Negative supply / ground reference | Common return for inputs and latch circuitry; supports split-supply (e.g., VEE = −5.2 V) or single-supply (VEE = 0 V) operation. |
| RHYS | Hysteresis control | External resistor sets hysteresis voltage (25–75 mV); prevents oscillation near threshold. |
| RHREF | Hysteresis reference | Bias node for RHYS network; tied internally to input common-mode reference. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-channel 700 ps propagation delay | Enables tightly synchronized decision timing across two independent high-speed signals without inter-channel skew penalties. |
| Adjustable hysteresis (25–75 mV) | Eliminates false triggering from noise or slow edges using a single external resistor per channel - no additional ICs required. |
| RSPECL outputs with VCCO-referenced swing | Provides interoperability with ECL, PECL, and LVDS logic families by simply setting VCCO = 2.5 V, 3.3 V, or 5 V - no level-shifting components needed. |
| Input common-mode range to VEE − 0.2 V | Permits direct connection to ground-referenced sources (e.g., ADC outputs, current-sense amplifiers) without AC coupling or bias networks. |
| Sub-100 ps latch timing parameters | tsLE = 95 ps and thLE = 29 ps allow precise synchronization of comparator decisions to high-frequency clock domains (e.g., >5 GHz sampling clocks). |
Applications
| Digital Receivers | High-Speed Signal Restoration |
|---|---|
Use Scenario: Recovering degraded NRZ data streams from long PCB traces or backplanes operating above 3 Gb/s. IC Role / Device Role / Timing Role: Dual comparator acts as a retiming slicer - one channel for data, one for embedded clock recovery or eye-monitoring. Use Value: 75 ps overdrive dispersion and 160 ps edge fidelity preserve jitter budget; RSPECL outputs drive 50 Ω transmission lines directly with <29 ps inter-channel skew. | Use Scenario: Restoring amplitude and timing integrity of attenuated high-frequency analog trigger signals in oscilloscopes or logic analyzers. IC Role / Device Role / Timing Role: Comparator provides fast, low-dispersion threshold detection with user-set hysteresis to suppress noise-induced retriggering. Use Value: Input range extending to VEE − 0.2 V enables direct DC-coupled acquisition; 708 ps delay ensures deterministic trigger latency across amplitude variations. |
| Zero-Crossing Detectors | High-Speed Sampling |
Use Scenario: Precision timing of AC waveform zero crossings in motor control or power converter feedback loops. IC Role / Device Role / Timing Role: Dual comparator monitors differential current/voltage sensor outputs and generates synchronized edge-aligned pulses. Use Value: Adjustable hysteresis eliminates chatter near zero; 2.7 V–12 V supply flexibility allows integration into both low-voltage gate drivers and high-voltage IGBT stacks. | Use Scenario: Sampling strobe generation for flash ADCs or time-interleaved converters requiring sub-ns aperture jitter. IC Role / Device Role / Timing Role: Latched comparator converts analog sample-and-hold output into deterministic digital decision with synchronous LE control. Use Value: tPD_LE = 893 ps and ΔtPDLH ≤ 29 ps ensure tight sampling window alignment across dual channels - critical for interleaved architectures. |
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 variant in same 24-pin WQFN; identical propagation delay (700 ps) and RSPECL outputs but higher total supply current (≈80 mA vs. 46 mA). | Used when four independent high-speed comparisons are required on one board; not pin-compatible due to different pin mapping and internal routing. | Select LMH7324MTX/NOPB only when quad functionality justifies added layout complexity and power; LMH7322SQE/NOPB remains optimal for dual-channel precision timing. |
| ADCMP572BCPZ-REEL7 | Single-channel, 2.5 GSPS comparator with CML outputs; lower propagation delay (240 ps) but no latch enable and narrower supply range (3.135 V–3.465 V). | Targeted at ultra-low-latency RF sampling; lacks hysteresis adjustment and dual-channel correlation capability. | Choose ADCMP572BCPZ-REEL7 only for single-ended, fixed-supply, sub-300 ps latency needs; LMH7322SQE/NOPB offers superior flexibility for industrial timing and latch-synchronized systems. |
Compared with LMH7324MTX/NOPB and ADCMP572BCPZ-REEL7, the LMH7322SQE/NOPB uniquely balances dual-channel correlation, user-adjustable hysteresis, wide supply adaptability (2.7 V–12 V), and integrated latch control - making it the preferred solution for deterministic, noise-resilient high-speed decision circuits requiring timing repeatability across voltage and temperature.
Availability
LMH7322SQE/NOPB is available at Aetrix Electronics and suitable for digital receivers, high-speed signal restoration, and zero-crossing detection requiring stable component supply across industrial temperature ranges and multi-voltage system designs.
Supply support for LMH7322SQE/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 delivering analog, embedded processing, and connectivity solutions for industrial, automotive, and communications markets.
The LMH7322SQE/NOPB belongs to TI's high-speed comparator product line, engineered for applications demanding sub-nanosecond timing accuracy, differential noise immunity, and flexible logic-family interfacing - especially in test equipment, optical modules, and real-time control systems.
FAQ
What is the minimum supply voltage required for reliable operation of the LMH7322SQE/NOPB?
The LMH7322SQE/NOPB operates reliably from 2.7 V to 12 V on both VCCI and VCCO supplies. At 2.7 V, propagation delay increases to 718 ps (typical, 100 mV overdrive), and RMS jitter rises to 551 fs - all within guaranteed specifications. This allows integration into low-voltage portable or battery-powered instrumentation without performance compromise.
Can the LMH7322SQE/NOPB be used with LVDS receivers?
Yes - the LMH7322SQE/NOPB outputs are RSPECL-compatible and become LVDS-compatible when VCCO is set to 2.5 V. At this supply, VOH = 1.4 V and VOL = 1.0 V (differential swing ≈ 400 mV), meeting LVDS standard thresholds. Termination must use 50 Ω to VT = VCCO − 2 V = 0.5 V, not ground, to maintain common-mode compliance.
How does hysteresis work on the LMH7322SQE/NOPB, and what resistor value sets 50 mV?
Hysteresis on the LMH7322SQE/NOPB is externally adjustable via RHYS between the RHYS and RHREF pins. A 1 kΩ resistor yields ~50 mV hysteresis (typical, per datasheet Figure 16). The hysteresis voltage is defined as VHYS+ − VHYS−, and scales linearly with RHYS - doubling resistance doubles hysteresis. No internal switching or configuration is required.
What is the maximum input differential voltage the LMH7322SQE/NOPB can tolerate without damage?
The absolute maximum differential voltage at INA+/INA− or INB+/INB− is ±13 V (per Absolute Maximum Ratings). However, sustained differential input > ±1 V causes conduction through internal clamp diodes, increasing input current beyond the specified ±250 nA offset. For reliable operation, keep VRID ≤ ±1 V - verified in Electrical Characteristics tables across 2.7 V, 5 V, and 12 V supplies.
Does the LMH7322SQE/NOPB support single-supply operation with VEE = 0 V?
Yes - the LMH7322SQE/NOPB supports true single-supply operation with VEE = 0 V. Its input common-mode range extends to VEE − 0.2 V = −0.2 V, allowing inputs to swing slightly below ground. When VEE = 0 V, VCCI and VCCO must be ≥2.7 V, and output termination must connect to VT = VCCO − 2 V (e.g., 0.5 V for VCCO = 2.5 V) rather than VEE.
LMH7322SQE/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)
LMH7322SQE/NOPB FAQ
1.How can I place an order for LMH7322SQE/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LMH7322SQE/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 LMH7322SQE/NOPB reliable?
The price and inventory of LMH7322SQE/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMH7322SQE/NOPB is usually 5 days.
3.What payment methods are accepted for LMH7322SQE/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMH7322SQE/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMH7322SQE/NOPB?
LMH7322SQE/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMH7322SQE/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 LMH7322SQE/NOPB?
For technical support, including LMH7322SQE/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMH7322SQE/NOPB requirements.
6.How does Aetrix verify that LMH7322SQE/NOPB is sourced from the original manufacturer or authorized distributors?
All LMH7322SQE/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 LMH7322SQE/NOPB meets industry standards.
7.What is the process for return or replacement of LMH7322SQE/NOPB?
All LMH7322SQE/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LMH7322SQE/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 LMH7322SQE/NOPB part is unused and in its original packaging.
Return procedure for LMH7322SQE/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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