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Analog Devices Inc. ADL5310ACP-REEL7
- Part No.:
- ADL5310ACP-REEL7
- Manufacturer:
- Analog Devices Inc.
- Category:
- Special Purpose Amplifiers
- Package:
- 24-VFQFN Exposed Pad, CSP
- Datasheet:
-
ADL5310ACP-REEL7.pdf
- Description:
- IC LOGARITHMIC CONV DUAL 24LFCSP
- Quantity:
- Payment:
- Shipping:
Inventory:12,768
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Product details
Overview
ADL5310ACP-REEL7 from Analog Devices is a dual-channel logarithmic amplifier IC optimized for photodiode current-to-voltage conversion in optical power monitoring. It delivers 120 dB dynamic range (3 nA to 3 mA), ±0.3 dB law conformance over full range, and temperature-stable 200 mV/decade slope. Used in laser control loops, optical attenuator feedback, and multichannel fiber supervisory systems.
For engineers reviewing the ADL5310ACP-REEL7 datasheet, ADL5310ACP-REEL7 pinout, ADL5310ACP-REEL7 application, or ADL5310ACP-REEL7 equivalent, this page provides verified technical context, exact pin functions, real-world use scenarios, and validated alternative options for optical current measurement designs requiring high dynamic range and channel matching.
Technical Context
The ADL5310ACP-REEL7 implements two independent translinear logarithmic converters sharing internal bias and temperature compensation circuitry. Each channel uses matched bipolar junction transistors with PTAT voltage subtraction and analog division to cancel kT/q and IS drift, achieving stable 200 mV/decade output scaling across –40°C to +85°C.
Input current is sunk at INP1/INP2 and reference current at IRF1/IRF2 into a fixed 0.5 V summing node (VSUM). LOG1/LOG2 outputs deliver raw logarithmic voltages; buffer amplifiers (OUT1/OUT2, BIN1/BIN2, SCL1/SCL2) provide rail-to-rail gain staging, filtering, and drive capability with 15 MHz bandwidth and 15 V/µs slew rate.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Dynamic Range | 120 dB (3 nA to 3 mA input): enables single-device measurement of optical power from sub-nW to mW levels without range switching. |
| Logarithmic Slope | 200 mV/decade (10 mV/dB) typ., 185–215 mV/decade over temperature: ensures consistent dB-per-volt scaling for calibrated optical gain/loss reporting. |
| Law Conformance Error | ±0.3 dB over 3 nA–3 mA at 25°C: guarantees <0.6 dB total error across full range, critical for precision absorbance and power ratio calculations. |
| Intercept Current | 300 pA typ. (with 3 µA reference & VRDZ→VREF): sets lower measurement bound; allows detection of ultra-low photocurrents in high-attenuation paths. |
| Supply Configuration | Single-supply (3–12 V) or dual-supply (VP–VN ≤12 V): supports grounded photodiode anodes in telecom line cards and bipolar operation for negative VLOG swing. |
| Quiescent Current | 9.5–11.5 mA: enables low-power optical monitoring in battery-backed or thermally constrained modules. |
| Package | 24-lead 4 mm × 4 mm LFCSP with exposed pad: provides compact footprint and thermal performance for dense optical subsystem layouts. |
Pinout & Package
ADL5310ACP-REEL7 is housed in a 24-lead Lead Frame Chip Scale Package (LFCSP), 4 mm × 4 mm, with exposed thermal pad requiring connection to analog ground.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| INP1, INP2 (Pins 2, 5) | Channel 1 & 2 numerator current inputs | Sink photodiode anode current; operate at ~0.5 V (VSUM potential); require guard routing to minimize leakage. |
| IRF1, IRF2 (Pins 3, 4) | Channel 1 & 2 denominator reference current inputs | Sink externally set reference current (e.g., 3 µA via 665 kΩ to VREF); define logarithmic intercept point. |
| LOG1, LOG2 (Pins 16, 15) | Raw logarithmic front-end outputs | Deliver temperature-compensated VLOG = 200 mV × log₁₀(IPD/IINTC); high impedance (~5 kΩ); avoid direct loading. |
| OUT1, OUT2 (Pins 19, 12) | Buffered output terminals | Rail-to-rail, low-impedance (≤0.5 Ω) outputs; support gain, filtering, or threshold detection with 15 MHz bandwidth. |
| VREF (Pins 7, 24) | 2.5 V reference voltage source | Stable 2.45–2.55 V output; supplies bias for RREF networks; used to set VRDZ and intercept offset. |
| VSUM (Pins 1, 6) | Summing node guard/reference | Internally tied 0.5 V node; shields INP/IRF inputs; may be grounded for dual-supply operation. |
| VPOS (Pins 8, 9), VNEG (Pins 10, 11, 20) | Power supply connections | VPOS accepts 3–12 V; VNEG is optional ground or negative rail; all pins must be externally connected. |
| COMM (Pins 21, 22) | Analog ground reference | Internally shorted; primary analog return path; must be low-impedance to system AGND. |
| VRDZ (Pin 23) | Intercept shift reference | When tied to VREF, adds 0.8 V offset to LOGx, shifting intercept down by 4 decades (e.g., 3 µA → 300 pA). |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent logarithmic channels | Enables simultaneous, matched measurement of two optical paths (e.g., Tx/Rx power, split-beam monitoring) without inter-channel crosstalk degradation. |
| User-configurable intercept via RREF | Reference resistors (e.g., 665 kΩ for 3 µA) directly set IINTC; supports custom ranges from 3 nA to 3 mA per channel. |
| Externally scalable slope | Buffer amplifiers allow precise gain adjustment post-log conversion-enabling 5 mV/dB, 20 mV/dB, or custom slopes without degrading front-end accuracy. |
| Temperature-stable transfer function | Drift-canceled architecture achieves <0.03 mV/°C VSUM variation and <100 pA intercept drift over –40°C to +85°C. |
| Low-noise, high-bandwidth buffers | 15 MHz unity-gain bandwidth and 15 V/µs slew rate support fast pulse response (e.g., <1 µs rise time for 30 µA–3 mA steps) and noise-sensitive signal conditioning. |
Applications
| Optical Power Monitoring | Laser Diode Control Loop |
|---|---|
|
Use Scenario: Real-time monitoring of transmitted and received optical power in DWDM line cards. IC Role / Device Role / Timing Role: Dual-channel logarithmic converter measuring photodiode currents from monitor taps on Tx and Rx paths. Use Value: 120 dB range captures both low-power startup conditions and full-output levels; matched channels enable accurate gain calculation (Tx–Rx) without calibration drift. |
Use Scenario: Closed-loop bias control of EML or DFB lasers to maintain constant output power over temperature and aging. IC Role / Device Role / Timing Role: Log amp converts back-facet photodiode current to linear-in-dB voltage fed to DAC-based controller. Use Value: ±0.3 dB law conformance ensures <0.5 dB power setpoint error; 200 mV/decade slope simplifies DAC resolution mapping and loop filter design. |
| Optical Attenuator Feedback | Multichannel Fiber Supervision |
|
Use Scenario: Dynamic gain equalization in ROADMs using variable optical attenuators (VOAs) with integrated photodiode feedback. IC Role / Device Role / Timing Role: Measures VOA input and output photodiode currents to compute real-time attenuation in dB. Use Value: Dual-channel architecture eliminates need for two separate log amps; shared bias improves channel-to-channel matching (<3 mV/dec slope mismatch). |
Use Scenario: Centralized monitoring of 16+ fiber links in data center interconnects using passive optical splitters and arrayed photodiodes. IC Role / Device Role / Timing Role: One ADL5310ACP-REEL7 per 2-channel slice; multiple devices aggregate dB-level status to host MCU. Use Value: Space-efficient 4 mm × 4 mm LFCSP reduces PCB area vs. discrete solutions; low 11.5 mA quiescent current minimizes thermal load in fanless enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-channel logarithmic amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD8305ARQZ-R7 | Single-channel, 90 dB range (10 nA–10 mA), no user-adjustable intercept, fixed 200 mV/dec slope. | Requires two units for dual-path monitoring; lacks independent reference inputs and VRDZ offset control. | Choose when only one optical path needs logging and board space permits duplication; not suitable for matched dual-channel gain measurement. |
| LOG114EIDR | Single-channel, 100 dB range (100 pA–1 mA), integrated reference, 2.5 V output compliance, 1.2 mA quiescent current. | Lower power but limited dynamic range; no dual-channel integration; requires external op-amps for buffering. | Prefer for ultra-low-power, single-path sensing where 100 dB suffices and layout allows discrete buffer implementation. |
Compared with AD8305ARQZ-R7 and LOG114EIDR, the ADL5310ACP-REEL7 uniquely delivers matched dual-channel logarithmic conversion with user-defined intercept and slope scaling in a single compact package-reducing component count, improving channel tracking, and enabling true optical gain/loss computation without external computation.
Availability
ADL5310ACP-REEL7 is available at Aetrix Electronics and suitable for optical power monitoring, laser diode control, optical attenuator feedback, and multichannel fiber supervision requiring stable component supply and guaranteed long-term availability.
Supply support for ADL5310ACP-REEL7 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, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Norwood, MA.
The ADL5310ACP-REEL7 belongs to Analog Devices' precision logarithmic amplifier product line, designed specifically for wide-dynamic-range optical current measurement in telecom, datacom, and industrial fiber-optic systems.
FAQ
What is the minimum detectable input current for ADL5310ACP-REEL7?
The ADL5310ACP-REEL7 achieves a 300 pA effective intercept current when configured with 3 µA reference current and VRDZ tied to VREF. This enables reliable detection of photodiode currents as low as 300 pA-critical for high-attenuation fiber links and low-light sensing applications. The device maintains ±0.6 dB law conformance down to this level across its full operating temperature range.
Can ADL5310ACP-REEL7 operate with a single 3.3 V supply?
Yes, ADL5310ACP-REEL7 supports single-supply operation from 3 V to 12 V. With VP = 3.3 V and VN = 0 V, the internal 0.5 V VSUM node remains valid, and LOG1/LOG2 outputs swing from ~0.10 V to 1.7 V. Buffer amplifiers (OUT1/OUT2) retain rail-to-rail capability, delivering full 0–3.3 V output range when configured for unity gain.
How do I configure ADL5310ACP-REEL7 for optical gain measurement?
To measure optical gain, connect the input photodiode to INP1 and the output photodiode to INP2; set identical reference currents (e.g., 665 kΩ to VREF) on IRF1 and IRF2; tie VRDZ to VREF. The difference between LOG1 and LOG2 voltages equals 200 mV × log₁₀(IPD1/IPD2), directly yielding gain in dB. Use OUT1/OUT2 with differential amplifier configuration for noise-immune readout.
Does ADL5310ACP-REEL7 require external calibration for accurate dB measurements?
No, ADL5310ACP-REEL7 achieves ±0.3 dB law conformance over 3 nA–3 mA without trimming. Its translinear architecture cancels temperature-dependent errors in VBE and IS, and the 200 mV/decade slope is factory-trimmed. System-level calibration is optional and typically limited to a single gain/offset correction at one current point to account for PCB trace resistance and ADC nonlinearity.
What is the role of the VSUM pins (1 and 6) in ADL5310ACP-REEL7?
Pins 1 and 6 (VSUM) are internally shorted guard nodes held at 0.5 V in single-supply mode. They shield INP1, INP2, IRF1, and IRF2 from leakage and parasitic capacitance. When using dual supplies (VN ≤ −0.5 V), grounding VSUM shifts all input nodes to 0 V-enabling voltage-mode operation with series input resistors and eliminating the need for floating photodiode biasing.
ADL5310ACP-REEL7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 24-VFQFN Exposed Pad, CSP
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Type:
- Logarithmic Converter
- Applications:
- Fiber Optics
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- 24-LFCSP-VQ (4x4)
ADL5310ACP-REEL7 FAQ
1.How can I place an order for ADL5310ACP-REEL7 through Aetrix?
Please submit a Request for Quotation (RFQ) for ADL5310ACP-REEL7 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 ADL5310ACP-REEL7 reliable?
The price and inventory of ADL5310ACP-REEL7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADL5310ACP-REEL7 is usually 5 days.
3.What payment methods are accepted for ADL5310ACP-REEL7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADL5310ACP-REEL7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADL5310ACP-REEL7?
ADL5310ACP-REEL7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADL5310ACP-REEL7 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 ADL5310ACP-REEL7?
For technical support, including ADL5310ACP-REEL7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADL5310ACP-REEL7 requirements.
6.How does Aetrix verify that ADL5310ACP-REEL7 is sourced from the original manufacturer or authorized distributors?
All ADL5310ACP-REEL7 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 ADL5310ACP-REEL7 meets industry standards.
7.What is the process for return or replacement of ADL5310ACP-REEL7?
All ADL5310ACP-REEL7 units undergo pre-shipment inspection (PSI). If there is an issue with ADL5310ACP-REEL7, 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 ADL5310ACP-REEL7 part is unused and in its original packaging.
Return procedure for ADL5310ACP-REEL7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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