My Inquiry
My Account
Texas Instruments LMH32404QWRHFRQ1
- Part No.:
- LMH32404QWRHFRQ1
- Manufacturer:
- Texas Instruments
- Category:
- Special Purpose Amplifiers
- Package:
- 28-VFQFN Exposed Pad
- Datasheet:
-
LMH32404QWRHFRQ1.pdf
- Description:
- AUTOMOTIVE FOUR-CHANNEL, DIFFERE
- Quantity:
- Payment:
- Shipping:
Inventory:3,930
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LMH32404QWRHFRQ1 from Texas Instruments is a quad-channel, single-ended-input to differential-output transimpedance amplifier (TIA) for automotive LIDAR and laser distance measurement systems. It delivers 20 kΩ transimpedance gain, 350 MHz small-signal bandwidth, 56 nARMS input-referred noise, and 10 ns channel switching time. Each channel integrates a 100-mA fast-recovery clamp and ambient light cancellation (ALC) circuit, enabling robust optical sensing in mechanically or solid-state scanning LIDAR.
For engineers reviewing the LMH32404QWRHFRQ1 datasheet, LMH32404QWRHFRQ1 pinout, LMH32404QWRHFRQ1 application, or LMH32404QWRHFRQ1 equivalent, key selection considerations include differential output drive capability (±500 mV offset), ALC loop enable control (IDC_EN), per-channel multiplexer select pins (M1–M4), and automotive-grade thermal performance (–40°C to +125°C).
Technical Context
The LMH32404QWRHFRQ1 implements four independent TIA channels with integrated differential output buffers, each featuring programmable standby via dedicated Mx control pins and shared EN global enable. Its closed-loop architecture supports photodiode configurations with either sinking or sourcing current, activating distinct clamp modes (fast recovery vs. soft clamp) based on bias polarity.
Each channel includes dual feedback paths: one for signal amplification (10 kΩ nominal transimpedance) and another for ambient light cancellation using an integrated current DAC and feedback loop. The VOCM and VOD pins provide precise control over differential output common-mode voltage (1.1 V typical) and differential offset (500 mV typical), respectively, with <±1% gain error across temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Transimpedance Gain | 20 kΩ typical - sets photocurrent-to-voltage conversion ratio for APD-based LIDAR front-ends |
| Small-Signal Bandwidth | 350 MHz - enables sub-nanosecond pulse detection critical for high-resolution time-of-flight measurements |
| Input-Referred Noise | 56 nARMS - determines minimum detectable photocurrent in low-light conditions |
| Channel Switching Time | 10 ns - allows rapid sequential sampling across four optical receivers without timing penalty |
| Quiescent Current | 28 mA/channel - defines active power budget per channel at 3.3 V supply |
| Ambient Light Cancellation Range | 2.5 mA - compensates DC photocurrent from background illumination without AC coupling |
| Integrated Clamp Current | 100 mA - protects TIA input stage during laser saturation or sunlight overload events |
Pinout & Package
The LMH32404QWRHFRQ1 is housed in a 28-pin VQFN package (5.00 mm × 4.00 mm body size) with exposed thermal pad connected to GND. Pin assignment supports four independent TIA channels, dual power domains (VDD1 for TIA core, VDD2 for output buffer), and flexible system-level control via logic inputs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN1–IN4 | Photodiode input nodes | Single-ended TIA inputs accepting sourced or sunk photocurrent from APDs |
| M1–M4 | Channel enable controls | Per-channel logic inputs to activate/deactivate output switches and enter standby mode |
| OUT1+ / OUT1− to OUT4+ / OUT4− | Differential output pairs | High-speed differential outputs delivering amplified, clamped, and ALC-compensated signals |
| EN | Global enable input | Logic-low enables all channels; logic-high places device into 2.5 mA low-power mode |
| IDC_EN | Ambient light cancellation control | Logic-low enables ALC loop; logic-high disables it for DC-sensitive applications |
| VOCM | Output common-mode voltage reference | Adjusts (VOUT+ + VOUT−)/2 to match ADC/TDC input range; default 1.1 V when floating |
| VOD | Differential output offset control | Sets (VOUT− − VOUT+) to 500 mV typical; enables fine-tuning of differential swing |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 100-mA fast-recovery clamp | Enables rapid recovery (<12 ns) after optical overload, preserving timing accuracy in pulsed LIDAR |
| Per-channel ambient light cancellation (ALC) | Eliminates need for external AC coupling capacitors, reducing board area and cost in multi-channel arrays |
| Quad-channel multiplexer with 10 ns switching | Supports time-division multiplexing of up to four photodiodes onto shared ADC/TDC resources |
| AEC-Q100 Grade 1 qualification | Validated for automotive operation from –40°C to +125°C ambient, including thermal cycling and ESD robustness |
| Differential output with VOCM/VOD control | Ensures compatibility with high-speed ADCs and TDCs by allowing precise alignment of common-mode and differential levels |
Applications
| Mechanically Scanning LIDAR | Solid-State Scanning LIDAR |
|---|---|
Use Scenario: Rotating mirror or prism directs laser pulses across field-of-view while four discrete photodiodes capture return signals at different angular positions. IC Role / Device Role / Timing Role: LMH32404QWRHFRQ1 acts as the analog front-end TIA for each photodiode, performing transimpedance conversion, overload protection, and ambient light rejection before feeding differential outputs to a TDC. Use Value: 10 ns channel switching enables seamless interleaving between photodiodes without dead time, maximizing effective frame rate and angular resolution. |
Use Scenario: MEMS mirrors or optical phased arrays steer laser beams across scene; multiple fixed photodiodes monitor returns from segmented FoV zones. IC Role / Device Role / Timing Role: LMH32404QWRHFRQ1 provides parallel, synchronized TIA channels with matched gain (±0.1%) and noise performance for consistent depth map generation. Use Value: Integrated ALC eliminates drift from solar loading on individual photodiodes, maintaining calibration stability across varying daylight conditions. |
| Laser Distance Meter | Safety Area Scanner |
Use Scenario: Handheld or industrial tool emits short laser pulses and measures round-trip time to determine distance to target surfaces. IC Role / Device Role / Timing Role: LMH32404QWRHFRQ1 conditions weak return signals from diffuse targets, leveraging 350 MHz bandwidth and 56 nARMS noise floor for centimeter-level precision. Use Value: 100-mA clamp prevents saturation during specular reflections, ensuring reliable pulse detection even at close range or high reflectivity. |
Use Scenario: Industrial safety curtain uses multiple laser beams across a protected zone; interruption triggers machine stop. IC Role / Device Role / Timing Role: LMH32404QWRHFRQ1 serves as fault-tolerant receiver front-end, detecting beam breaks with nanosecond timing resolution and rejecting ambient light interference. Use Value: Standby mode (10 mA/channel) and low-power mode (2.5 mA total) reduce system idle power while maintaining readiness for instantaneous response. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transimpedance amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LMH32401QWRHFRQ1 | Single-channel version with identical gain, bandwidth, and ALC; same 28-pin VQFN package | Used where only one photodiode channel is required per PCB; lacks M1–M4 multiplexer controls | Select when system requires lower channel count and simpler routing; shares layout compatibility but no inter-channel switching |
| OPA858IDSGR | Single-channel JFET-input amplifier with 8 GHz gain-bandwidth product; no integrated clamp or ALC; SOIC-8 package | Targeted at ultra-high-bandwidth lab instrumentation; requires external protection and ambient compensation circuits | Choose for non-automotive, non-LIDAR applications needing wider bandwidth and lower input capacitance; not AEC-Q100 qualified |
Compared with LMH32401QWRHFRQ1 and OPA858IDSGR, the LMH32404QWRHFRQ1 uniquely combines quad-channel integration, automotive qualification, on-chip overload protection, and ambient light cancellation-enabling compact, robust, and production-ready LIDAR front-ends without external support components.
Availability
LMH32404QWRHFRQ1 is available at Aetrix Electronics and suitable for mechanically scanning LIDAR, solid-state scanning LIDAR, and laser distance meter applications requiring stable component supply, automotive-grade reliability, and long-term lifecycle support.
Supply support for LMH32404QWRHFRQ1 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 company specializing in analog and embedded processing technologies, with leadership in high-performance signal chain and power management solutions.
The LMH32404QWRHFRQ1 belongs to TI's automotive-qualified high-speed analog portfolio, designed specifically for LIDAR and time-of-flight sensing systems demanding precision, speed, and functional safety compliance.
FAQ
What is the operating temperature range for the LMH32404QWRHFRQ1?
The LMH32404QWRHFRQ1 is AEC-Q100 Grade 1 qualified and operates from –40°C to +125°C ambient temperature. This rating covers full electrical performance specifications across the range, including transimpedance gain stability, noise, and channel switching time, making it suitable for under-hood automotive LIDAR deployments.
How does the ambient light cancellation (ALC) function work in the LMH32404QWRHFRQ1?
The LMH32404QWRHFRQ1 implements ALC via a dedicated current DAC and feedback loop controlled by the IDC_EN pin. When IDC_EN is logic-low, the loop injects opposing current to cancel DC photocurrent up to 2.5 mA, eliminating the need for AC coupling. The settling time is 20 µs for 0 → 10 µA steps, and ALC adds measurable noise-so it must be disabled for DC-critical measurements.
Can the LMH32404QWRHFRQ1 drive standard LVDS or CML receivers directly?
Yes-the LMH32404QWRHFRQ1 delivers differential outputs with 500 mV typical offset and 100 Ω differential output impedance (enabled), compatible with most high-speed ADCs and TDCs. VOCM and VOD pins allow precise alignment to receiver input ranges; for LVDS, set VOCM ≈ 1.2 V and VOD ≈ 0.35 V to meet common-mode and differential swing requirements.
What happens during an optical overload event on the LMH32404QWRHFRQ1 input?
Each channel features a 100-mA fast-recovery clamp that activates when input current exceeds safe limits. Recovery time is 12 ns to 1% settling, preserving timing integrity. Clamp behavior differs based on photodiode bias: sinking configurations trigger fast recovery; sourcing configurations use a softer clamp with longer recovery dependent on overload magnitude.
Is the LMH32404QWRHFRQ1 pin-compatible with other devices in the LMH324xx-Q1 family?
No-LMH32404QWRHFRQ1 is not pin-compatible with LMH32401QWRHFRQ1 or LMH32402QWRHFRQ1. While all share the 28-pin VQFN (RHF) package, pin functions differ significantly: LMH32404QWRHFRQ1 dedicates pins M1–M4 for per-channel enable, whereas LMH32401QWRHFRQ1 repurposes those as analog outputs or supplies. Layout reuse is not possible without redesign.
LMH32404QWRHFRQ1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 28-VFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Transimpedance Amplifier
- Applications:
- FTTx and Media Converters
- Mounting Type:
- Surface Mount, Wettable Flank
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Supplier Device Package:
- 28-VQFN (5x4)
LMH32404QWRHFRQ1 FAQ
1.How can I place an order for LMH32404QWRHFRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LMH32404QWRHFRQ1 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 LMH32404QWRHFRQ1 reliable?
The price and inventory of LMH32404QWRHFRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMH32404QWRHFRQ1 is usually 5 days.
3.What payment methods are accepted for LMH32404QWRHFRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMH32404QWRHFRQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMH32404QWRHFRQ1?
LMH32404QWRHFRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMH32404QWRHFRQ1 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 LMH32404QWRHFRQ1?
For technical support, including LMH32404QWRHFRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMH32404QWRHFRQ1 requirements.
6.How does Aetrix verify that LMH32404QWRHFRQ1 is sourced from the original manufacturer or authorized distributors?
All LMH32404QWRHFRQ1 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 LMH32404QWRHFRQ1 meets industry standards.
7.What is the process for return or replacement of LMH32404QWRHFRQ1?
All LMH32404QWRHFRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with LMH32404QWRHFRQ1, 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 LMH32404QWRHFRQ1 part is unused and in its original packaging.
Return procedure for LMH32404QWRHFRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LMH32404QWRHFRQ1 Tags
-
TSM103WIDT
STMicroelectronics
-
LM392M/NOPB
Texas Instruments
-
MCP6S93T-E/UN
Microchip Technology
-
INA137UA/2K5
Texas Instruments
-
INA134UA/2K5
Texas Instruments
-
TS34118CS28 RDG
Taiwan Semiconductor Corporation
-
SI8920BC-IPR
Skyworks Solutions Inc.
-
ADUM3190ARQZ-RL7
Analog Devices Inc.
-
ADUM3190ARQZ
Analog Devices Inc.
-
AMC1311BDWVR
Texas Instruments
-
AMC1350DWVR
Texas Instruments
-
ADUM3190SRQZ-RL7
Analog Devices Inc.
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
