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Analog Devices Inc./Maxim Integrated MAX40660A/D+
- Part No.:
- MAX40660A/D+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Special Purpose Amplifiers
- Package:
- Die
- Datasheet:
-
MAX40660A/D+.pdf
- Description:
- TRANSIMPEDANCE AMPLIFIER (DIE PA
- Quantity:
- Payment:
- Shipping:
Inventory:1,643
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Product details
Overview
The MAX40660A/D+ from Analog Devices is a high-bandwidth automotive transimpedance amplifier (TIA) designed for optical distance measurement in LiDAR receivers. It delivers 2.1pA/√Hz input-referred noise density, 490MHz typical bandwidth (with 0.5pF input capacitance and 25kΩ gain), fast 2ns overload recovery, and AEC-Q100 qualification for -40°C to +125°C operation - enabling precise time-of-flight detection in automotive LiDAR systems.
For engineers reviewing the MAX40660A/D+ datasheet, MAX40660A/D+ pinout, MAX40660A/D+ application, or MAX40660A/D+ equivalent, this bare-die TIA offers critical performance for high-speed photodiode signal conditioning in safety-critical distance-sensing circuits where low noise, wide bandwidth, and transient robustness are mandatory.
Technical Context
The MAX40660A/D+ implements a two-stage architecture: a low-noise transimpedance input stage with internal clamp protection against up to 2A transient input current (10ns, 0.5% duty cycle), followed by a differential voltage output stage optimized for driving 100Ω AC-coupled loads. Its input accepts negative current pulses flowing out of the IN pin, compatible with reverse-biased photodiodes or APDs.
Pin-selectable transimpedance (25kΩ or 50kΩ via GAIN pin), offset current adjustment (via OFFSET pin), and logic-controlled low-power standby mode (via LP pin, reducing supply current >80%) provide system-level flexibility. The device operates from a single 3.3V supply and features internal biasing (VBIAS = 0.85–1.0V at IN/OFFSET) and VCL-supplied clamp circuitry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Transimpedance | 25kΩ (GAIN = GND) or 50kΩ (GAIN = VCC); enables scalable gain selection without external components |
| Bandwidth | 490MHz typical (CIN = 0.5pF, 25kΩ); supports sub-nanosecond pulse resolution for high-accuracy ToF measurement |
| Input Noise Density | 2.1pA/√Hz @ 10MHz (CIN = 0.8pF); minimizes signal degradation in low-light LiDAR conditions |
| Overload Recovery | 2ns (0 to –100mA step); ensures rapid return to linear operation after photodiode saturation events |
| Supply Voltage | +2.9V to +3.5V; compatible with standard automotive 3.3V rails and robust against supply variation |
| Operating Temperature | –40°C to +125°C (AEC-Q100 qualified); validated for under-hood and front-end automotive placement |
| Low-Power Mode Current | 8–13mA (LP = low); reduces average power between laser pulses, critical for thermal management |
Pinout & Package
The MAX40660A/D+ is supplied as bare die (no package), requiring chip-and-wire assembly. The die features 10 bond pads arranged in a symmetric layout with dedicated ground, power, signal, and control connections. Thermal and electrical performance requires backside grounding and exposed pad connection to system ground in packaged variants - not applicable to bare-die form.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCL | Clamp Supply | Must be connected to VCC to enable 2A transient input protection; powers internal clamp circuitry |
| LP | Low-Power Enable | Logic-high (≥2.0V) enables full operation; logic-low (≤0.8V) reduces ICC by >80% for pulse-gated systems |
| IN | Photodiode Input | Accepts negative current pulses flowing out of pin; connects directly to APD cathode in DC-coupled configurations |
| OFFSET | Offset Adjustment | Sink current to apply counteracting offset; polarity opposite IN, enabling fine output DC calibration |
| GAIN | Transimpedance Select | GND = 25kΩ, VCC = 50kΩ; sets primary gain without external resistors or layout changes |
| OUTN / OUTP | Differential Output | 50Ω single-ended outputs; require AC-coupling and 100Ω differential termination for optimal signal integrity |
| VCC | Supply Rail | +3.3V nominal; bypassing with 0.1µF ceramic capacitors near die edges essential for RF stability |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Qualified | Validated for automotive use across –40°C to +125°C ambient; supports ASIL-B system compliance with FMEDA available |
| Internal Input Clamp | Protects against 2A transient input current (10ns, 0.5% duty cycle); prevents latch-up and enables robust operation in high-irradiance environments |
| Fast Overload Recovery | 2ns recovery time from –100mA overload; preserves timing accuracy during photodiode saturation in pulsed LiDAR |
| Pin-Selectable Gain | 25kΩ or 50kΩ transimpedance selected via single logic-level input; eliminates need for external gain-setting resistors |
| Offset Current Adjustment | Current-sink OFFSET pin allows real-time correction of input offset without trimming or calibration hardware |
| Low-Power Standby | Reduces supply current to ≤13mA during inactive periods; lowers average power and thermal load in burst-mode LiDAR systems |
Applications
| Automotive LiDAR Front-End | Industrial Safety Scanners |
|---|---|
Use Scenario: High-speed time-of-flight distance measurement in autonomous vehicle perception systems using 905nm pulsed lasers and APDs. IC Role / Device Role / Timing Role: Transimpedance amplifier converting APD photocurrent pulses into clean, low-jitter differential voltage signals for high-speed ADC sampling. Use Value: 490MHz bandwidth and 2.1pA/√Hz noise enable centimeter-level ranging accuracy at 200m range with minimal false positives. |
Use Scenario: Light curtain and zone-monitoring systems in robotic workcells requiring reliable object detection within 5m. IC Role / Device Role / Timing Role: Signal conditioner for fast-response photodiode arrays detecting beam interruption with sub-microsecond latency. Use Value: 2ns overload recovery prevents blind time after bright reflections, ensuring continuous safety monitoring without missed events. |
| Autonomous Driving Perception | High-Resolution 3D Mapping |
Use Scenario: Multi-beam flash LiDAR modules in ADAS Level 3+ vehicles performing simultaneous long- and short-range sensing. IC Role / Device Role / Timing Role: Core analog front-end element providing matched gain, bandwidth, and noise performance across parallel receiver channels. Use Value: Pin-selectable 25kΩ/50kΩ gain allows identical die to serve both near-field (high-sensitivity) and far-field (high-bandwidth) channels. |
Use Scenario: Mobile mapping systems on drones or survey vehicles capturing dense point clouds at highway speeds. IC Role / Device Role / Timing Role: Low-noise, high-linearity TIA enabling accurate amplitude and timing extraction from weak return pulses over variable terrain. Use Value: 0.25–5pF input capacitance optimization supports ultra-low-capacitance SiPM or custom APD arrays for maximum SNR in low-signal conditions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transimpedance amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX40660ATB/VY+ | Same die, 10-pin TDFN package with side-wettable flanks; includes exposed thermal pad and standardized footprint | Preferred for PCB-based prototyping and volume production where reflow assembly and thermal management are required | Select when board-level integration, automated optical inspection, or thermal dissipation >1W is needed |
| MAX40661A/D+ | Bare-die variant optimized for 5–12pF input capacitance; 160MHz bandwidth (CIN = 10pF); higher input noise (3.0pA/√Hz) | Targeted at higher-capacitance photodiodes (e.g., large-area SiPMs) where bandwidth trade-off is acceptable for sensitivity | Select when interfacing with >5pF detectors and lower bandwidth suffices for application timing budget |
Compared with MAX40660ATB/VY+, the MAX40660A/D+ sacrifices package-level thermal and assembly convenience for lowest possible parasitic capacitance and highest bandwidth. Compared with MAX40661A/D+, it provides 3× higher bandwidth and 30% lower noise but requires tighter input capacitance control (≤5pF).
Availability
The MAX40660A/D+ is available at Aetrix Electronics and suitable for automotive LiDAR front-ends, industrial safety scanners, and autonomous driving perception systems requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for MAX40660A/D+ 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 automotive, industrial, communications, and healthcare markets with precision signal chain solutions.
The MAX40660A/D+ belongs to Analog Devices' automotive-qualified high-speed amplifier portfolio, engineered specifically for optical distance measurement in safety-critical LiDAR systems demanding AEC-Q100 reliability and sub-nanosecond timing fidelity.
FAQ
What is the operating temperature range for the MAX40660A/D+?
The MAX40660A/D+ is AEC-Q100 qualified for operation from –40°C to +125°C ambient temperature. As a bare-die part, its junction temperature must be maintained within –40°C to +150°C per datasheet specifications. Thermal design must ensure adequate heat sinking through the backside ground connection and surrounding substrate to avoid exceeding these limits during continuous operation.
How does the OFFSET pin function in the MAX40660A/D+?
The OFFSET pin on the MAX40660A/D+ is a current-sink input that applies an opposing offset current to the transimpedance stage. Sinking current from this pin adjusts the effective input offset, allowing calibration of output DC level without external components. When unused, the pin must remain unconnected - no pull-up or pull-down is required, and bias voltage matches the IN pin (0.85–1.0V).
Can the MAX40660A/D+ drive a 50Ω coaxial cable directly?
No, the MAX40660A/D+ cannot drive a 50Ω coaxial cable directly. Its OUTP and OUTN pins are designed as 50Ω single-ended outputs requiring AC coupling and termination into a 100Ω differential load placed close to the outputs. Direct DC-coupled 50Ω loading violates the output stage specification and degrades common-mode voltage stability, bandwidth, and distortion performance.
What is the purpose of the VCL pin on the MAX40660A/D+?
The VCL pin on the MAX40660A/D+ supplies power to the internal input current clamp circuit. It must be connected to VCC to enable protection against transient input currents up to 2A (10ns, 0.5% duty cycle). Leaving VCL unconnected disables the clamp, exposing the input stage to potential damage during photodiode saturation or ESD events.
Is the MAX40660A/D+ pin-compatible with the MAX40660ATB+ package variant?
No - the MAX40660A/D+ is bare die with bond pad layout, while the MAX40660ATB+ is a 10-pin TDFN packaged device. They share identical electrical functionality and pin functions, but differ in physical interface: the bare die requires wire bonding and custom substrate routing, whereas the TDFN uses surface-mount solder joints. No PCB footprint or interconnect compatibility exists between the two forms.
MAX40660A/D+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- Die
- Packaging:
- Tray
- Product Status:
- Active
- Type:
- Transimpedance Amplifier
- Applications:
- LIDAR Receivers, Optical
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- Die
MAX40660A/D+ FAQ
1.How can I place an order for MAX40660A/D+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX40660A/D+ 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 MAX40660A/D+ reliable?
The price and inventory of MAX40660A/D+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX40660A/D+ is usually 5 days.
3.What payment methods are accepted for MAX40660A/D+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX40660A/D+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX40660A/D+?
MAX40660A/D+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX40660A/D+ 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 MAX40660A/D+?
For technical support, including MAX40660A/D+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX40660A/D+ requirements.
6.How does Aetrix verify that MAX40660A/D+ is sourced from the original manufacturer or authorized distributors?
All MAX40660A/D+ 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 MAX40660A/D+ meets industry standards.
7.What is the process for return or replacement of MAX40660A/D+?
All MAX40660A/D+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX40660A/D+, 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 MAX40660A/D+ part is unused and in its original packaging.
Return procedure for MAX40660A/D+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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