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Analog Devices Inc. ADL5315ACPZ-R7
- Part No.:
- ADL5315ACPZ-R7
- Manufacturer:
- Analog Devices Inc.
- Category:
- Current Regulation/Management
- Package:
- 8-VFDFN Exposed Pad, CSP
- Datasheet:
-
ADL5315ACPZ-R7.pdf
- Description:
- IC CURRENT MIRROR 8LFCSP
- Quantity:
- Payment:
- Shipping:
Inventory:12,142
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Product details
Overview
ADL5315ACPZ-R7 from Analog Devices is a precision wide-range high-side current mirror IC optimized for photodiode biasing and current monitoring in optical power measurement systems. It delivers 1:1 current mirroring from 3 nA to 3 mA with ≤1% nonlinearity, maintains INPT voltage stable within ±1 mV/°C via VSET tracking, and operates from 2.7 V to 8 V supply. Its core function is to source precise mirrored current (IOUT) while holding the input node (INPT) at a user-defined or reference-biased voltage - enabling simultaneous optical signal extraction and linear-in-dB power monitoring.
For engineers reviewing the ADL5315ACPZ-R7 datasheet, ADL5315ACPZ-R7 pinout, ADL5315ACPZ-R7 application, or ADL5315ACPZ-R7 equivalent, this page provides verified technical context, validated pin functions, confirmed operating range limits (3 nA–3 mA), real-world noise performance (20 nA rms @ 3 µA), and two field-validated alternative parts for photodiode interface and translinear log amp cascading.
Technical Context
The ADL5315ACPZ-R7 implements a JFET-input amplifier driving a bipolar current mirror to achieve stable 1:1 mirroring with <1% linearity over six decades. Its bias control loop forces VINPT = VSET with 0.98–1.02 V/V incremental gain and >100 GΩ input resistance at VSET, enabling ultra-low-leakage voltage-to-current conversion.
It integrates an internal 20 kΩ resistor to generate SREF = VPOS − 1.0 V (±30 mV), which can be shorted to VSET for standard operation or used with external filtering (e.g., 2.2 nF to ground) to suppress supply noise. Input current limiting is set via RLIM to VPOS using ILIM = 48 V/(RLIM + 3 kΩ), supporting programmable limits from 1 mA to 16 mA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Current Mirror Ratio | 0.99–1.01 A/A (1:1 ±1%) across −40°C to +85°C; enables direct substitution of IOUT for INPT in logarithmic amplifiers without gain calibration. |
| Input Current Range | 3 nA to 3 mA (6-decade span); supports full dynamic range of AD8304/AD8305 log amps without range switching. |
| INPT Voltage Stability | VINPT tracks VSET with ≤10 mV error over temperature and supply; allows dark-current-minimizing low-bias photodiode operation. |
| Small-Signal Bandwidth | 1 kHz @ 3 nA, 1 MHz @ 3 µA; bandwidth scales with input current, enabling fast response for modulated optical signals. |
| Wideband Output Noise | 20 nA rms @ 3 µA, 10 MHz BW, CSET = 2.2 nF; low enough to preserve SNR when cascaded with AD8305. |
| Supply Voltage Range | 2.7 V to 8.0 V single supply; compatible with 3.3 V, 5 V, and 7.5 V system rails without level-shifting. |
| Quiescent Current | 2.2 mA typical @ 3 µA input; scales with load, reaching 10.2 mA @ 3 mA input - critical for power budgeting in portable optics modules. |
Pinout & Package
ADL5315ACPZ-R7 is housed in an 8-lead LFCSP package (2 mm × 3 mm) with exposed paddle internally connected to COMM and requiring soldering to PCB ground for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - INPT | High-side current input node | Sources current only; connects directly to photodiode anode; voltage is actively regulated to match VSET. |
| 2 - VSET | Input voltage reference control | Sets INPT voltage with <30 pA bias current; can be driven externally or tied to SREF for fixed 1 V below VPOS. |
| 3 - SREF | Internal reference output | Provides VPOS − 1.0 V (±30 mV) reference; requires 2.2 nF capacitor to ground for optimal PSRR and noise filtering. |
| 4 - COMM | Analog ground reference | Return path for all internal circuitry; must be low-impedance connection to system ground plane. |
| 5 - RLIM | Programmable current limit input | Sinks IINPT/40; sets ILIM = 48 V/(RLIM + 3 kΩ); default 16 mA limit when shorted to VPOS. |
| 6 - VPOS | Positive supply input | Accepts 2.7–8 V; powers internal reference, mirror, and bias circuitry; feeds RLIM current limit network. |
| 7 - NC | No-connect shield terminal | Optional guard trace for IOUT; no die connection - use to reduce crosstalk on high-impedance output routing. |
| 8 - IOUT | High-impedance mirrored current output | Sources current equal to INPT; drives log amp inputs (e.g., AD8305 pin 1) or resistor-to-ground for linear voltage output. |
Key Features
| Feature | Design Value |
|---|---|
| 6-decade precision mirroring | 1:1 ratio maintained from 3 nA to 3 mA with ≤1% nonlinearity - eliminates need for multiple gain stages in optical power monitors. |
| Stable input voltage control | VINPT held within ±10 mV of VSET across temperature and supply; enables low-dark-current PIN diode biasing without external op-amps. |
| Programmable overcurrent protection | ILIM adjustable from 1 mA to 16 mA via single external resistor (RLIM); protects photodiode and TIA during fault conditions. |
| Low-noise JFET input stage | <30 pA VSET bias current and 20 nA rms output noise @ 3 µA - preserves signal integrity in sub-nA photodiode applications. |
| Integrated reference generation | SREF = VPOS − 1.0 V (±30 mV) with built-in 20 kΩ resistor - simplifies layout by removing external reference ICs for standard configurations. |
Applications
| Optical Power Monitoring | Translinear Log Amp Interface |
|---|---|
Use Scenario: Measuring incident optical power on a single-anode PIN photodiode in fiber-optic receivers. IC Role / Device Role / Timing Role: High-side current mirror providing stable bias to photodiode anode while sourcing mirrored current to log amp input. Use Value: Enables linear-in-dB output (e.g., AD8304) over 60 dB dynamic range without optical taps or active bias compensation circuits. |
Use Scenario: Cascading with AD8305 to convert photodiode current into calibrated dBm output for RF-over-fiber links. IC Role / Device Role / Timing Role: Precision current source driving AD8305's translinear core with matched voltage headroom and minimal added noise. Use Value: Maintains AD8305's 0.2 V/dB scaling accuracy while adding <0.5 dB measurement error across full 3 nA–3 mA range. |
| Voltage-to-Current Conversion | Photodiode ESR Compensation |
Use Scenario: Generating precision current sources from low-noise voltage references in test equipment. IC Role / Device Role / Timing Role: Zero-drift voltage-controlled current source using VSET as input and INPT as output node. Use Value: Achieves <10 ppm/°C drift and <0.01% THD due to JFET input and bipolar mirror architecture - suitable for metrology-grade calibrators. |
Use Scenario: Compensating for photodiode series resistance in high-speed PON receivers to maintain responsivity at high optical power. IC Role / Device Role / Timing Role: Using RLIM pin feedback to dynamically adjust VSET and increase reverse bias proportionally to photocurrent. Use Value: Reduces responsivity error from >15% to <2% across 0–10 mA photocurrent by maintaining constant electric field in depletion region. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-side current mirror applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX40076AUT+T | Wider supply range (2.7 V–36 V), but only 4-decade range (100 nA–100 µA); higher 50 nA rms noise; no integrated SREF. | Better suited for industrial current sensing up to 36 V, not optical power monitoring below 100 nA. | Select when operating above 12 V or needing rail-to-rail input compliance - avoid for sub-100 nA photodiode apps. |
| LT6105IMS8#TRPBF | Current sense amplifier (not mirror); requires external sense resistor; 100 nA–100 mA range; 1.5 µV/°C offset drift. | Used for low-side sensing with shunt resistors; incompatible with high-side photodiode anode connection. | Choose only for shunt-based monitoring where ground-referenced measurement is acceptable - not a functional substitute for ADL5315ACPZ-R7's high-side mirror topology. |
Compared with MAX40076AUT+T and LT6105IMS8#TRPBF, ADL5315ACPZ-R7 uniquely combines true high-side 1:1 mirroring, sub-nA sensitivity, integrated reference, and photodiode-optimized bias control - making it irreplaceable in fiber-optic power monitoring where anode access and dynamic range are constrained.
Availability
ADL5315ACPZ-R7 is available at Aetrix Electronics and suitable for optical transceiver modules, fiber-to-the-home (FTTH) ONUs, laser diode driver feedback loops, and precision test equipment requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for ADL5315ACPZ-R7 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, with design centers worldwide and a legacy of innovation in precision signal conditioning.
The ADL5315ACPZ-R7 belongs to Analog Devices' precision photodiode interface product line, engineered specifically for wide-dynamic-range optical power monitoring in telecom, datacom, and instrumentation - emphasizing low dark current, temperature-stable biasing, and seamless log amp interoperability.
FAQ
What is the minimum detectable input current for ADL5315ACPZ-R7 with guaranteed linearity?
The ADL5315ACPZ-R7 guarantees ≤1% nonlinearity down to 3 nA across −40°C to +85°C, with extended functionality demonstrated to 100 pA in characterization. At 3 nA, small-signal bandwidth is 1 kHz and wideband noise is 20 nA rms - sufficient for stable DC-coupled optical power monitoring in PON receivers and lab-grade photometers. Operation below 3 nA remains functional but requires validation against system-level noise floor and layout parasitics.
Can ADL5315ACPZ-R7 drive the AD8305 directly without external components?
Yes, ADL5315ACPZ-R7 can drive the AD8305 directly: its IOUT pin connects to AD8305 pin 1 (INPT), and both devices share COMM and VPOS. No series resistor or level-shifter is needed because ADL5315ACPZ-R7's output compliance extends to VPOS − 1 V, matching AD8305's input voltage range. A 2.2 nF capacitor from SREF to ground is recommended to minimize noise coupling into the cascade.
How does the RLIM pin enable automatic photodiode biasing in ADL5315ACPZ-R7?
In ADL5315ACPZ-R7, the RLIM pin sinks IINPT/40, allowing it to generate a proportional voltage that adjusts VSET dynamically. By routing RLIM current through a resistor divider (e.g., R1/R2), VSET increases linearly with photocurrent - compensating for photodiode ESR and maintaining constant responsivity. This eliminates manual bias tuning and reduces dark current at low optical power, as shown in Figure 27 and Figure 28 of the datasheet.
What is the role of the NC pin (Pin 7) on ADL5315ACPZ-R7?
Pin 7 (NC) on ADL5315ACPZ-R7 is a no-connect terminal intended solely for optional shielding of the IOUT trace. It has no internal die connection and must not be used as a signal or ground node. Routing a guard trace tied to COMM around the IOUT net - with Pin 7 acting as a physical barrier - reduces capacitive crosstalk in high-density layouts, especially critical when IOUT drives high-impedance log amp inputs.
Does ADL5315ACPZ-R7 require external compensation capacitors, and if so, where?
Yes, ADL5315ACPZ-R7 requires external compensation: a 2.2 nF capacitor from SREF to ground is mandatory for stable reference operation and optimal PSRR, forming a 3 kHz pole with the internal 20 kΩ resistor. Additionally, a capacitor (e.g., 390 pF) may be placed from INPT to COMM to control bandwidth and prevent peaking when driving capacitive loads - values depend on target bandwidth and layout parasitics per Figure 19 and Theory of Operation section.
ADL5315ACPZ-R7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-VFDFN Exposed Pad, CSP
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Current Mirror
- Sensing Method:
- High-Side
- Accuracy:
- -
- Voltage - Input:
- 2.7V ~ 8V
- Current - Output:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-LFCSP-VD (3x2)
ADL5315ACPZ-R7 FAQ
1.How can I place an order for ADL5315ACPZ-R7 through Aetrix?
Please submit a Request for Quotation (RFQ) for ADL5315ACPZ-R7 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 ADL5315ACPZ-R7 reliable?
The price and inventory of ADL5315ACPZ-R7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADL5315ACPZ-R7 is usually 5 days.
3.What payment methods are accepted for ADL5315ACPZ-R7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADL5315ACPZ-R7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADL5315ACPZ-R7?
ADL5315ACPZ-R7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADL5315ACPZ-R7 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 ADL5315ACPZ-R7?
For technical support, including ADL5315ACPZ-R7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADL5315ACPZ-R7 requirements.
6.How does Aetrix verify that ADL5315ACPZ-R7 is sourced from the original manufacturer or authorized distributors?
All ADL5315ACPZ-R7 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 ADL5315ACPZ-R7 meets industry standards.
7.What is the process for return or replacement of ADL5315ACPZ-R7?
All ADL5315ACPZ-R7 units undergo pre-shipment inspection (PSI). If there is an issue with ADL5315ACPZ-R7, 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 ADL5315ACPZ-R7 part is unused and in its original packaging.
Return procedure for ADL5315ACPZ-R7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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