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Renesas ISL1557AIRZ-T7
- Part No.:
- ISL1557AIRZ-T7
- Manufacturer:
- Renesas
- Category:
- Telecom
- Package:
- 16-VQFN Exposed Pad
- Datasheet:
-
ISL1557AIRZ-T7.pdf
- Description:
- IC TELECOM INTERFACE 16QFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,603
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Product details
Overview
ISL1557AIRZ-T7 from Renesas Electronics is a dual current-feedback operational amplifier engineered for xDSL line driving in ADSL2+, VDSL2, SDSL, and HDSL2 systems. It delivers 750mA output current from a single 4.5V–12V supply, achieves –80dBc distortion at 150kHz into 25Ω, and features C0/C1 bias control pins for dynamic power scaling. It serves as the differential line driver stage in DSL customer premises equipment (CPE) modems.
For engineers reviewing the ISL1557AIRZ-T7 datasheet, ISL1557AIRZ-T7 pinout, ISL1557AIRZ-T7 application, or ISL1557AIRZ-T7 equivalent, key selection criteria include its 300MHz bandwidth, thermal shutdown protection, ±2.25V to ±6V dual-supply compatibility, 21dBm output power capability, and QFN-16 package with exposed thermal pad tied to VS−.
Technical Context
The ISL1557AIRZ-T7 implements a dual current-feedback amplifier architecture optimized for high-speed, low-distortion DSL line driving. Its closed-loop bandwidth is resistor-programmable via feedback resistor RF (e.g., 750Ω for 250MHz at AV = +5), and gain is set independently by RG - enabling precise trade-offs between bandwidth, peaking, and distortion across 2MHz–17MHz DSL bands.
It integrates two independent amplifiers (A and B) forming one DSL port, with C0 and C1 pins controlling bias current per amplifier to support full/medium/low-power modes (15mA/11mA/6mA per amp). Output clamps enhance lightning transient immunity, and thermal shutdown protects against sustained overload in transformer-coupled line interfaces.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | Single supply: 4.5V to 12V; dual supply: ±2.25V to ±6V - supports both legacy split-rail and modern single-rail DSL CPE designs. |
| Output Current | 750mA continuous per amplifier - sufficient to drive 21dBm (125mW) into 100Ω line with transformer coupling and back termination. |
| THD @ 150kHz | –80dBc typical into 25Ω - meets stringent spectral mask requirements for VDSL2 upstream transmission. |
| Bandwidth | 300MHz (RF = 499Ω, AV = +5) - enables clean signal reproduction up to 17MHz with <1dB peaking in full-bias mode. |
| Quiescent Current | 6mA per amplifier in low-bias mode - reduces total system power by >50% vs full-bias during idle or low-data-rate states. |
| Protection Features | Integrated output clamps + thermal shutdown - eliminates need for external TVS diodes in lightning-prone deployments. |
| Operating Temperature | –40°C to +85°C - qualified for industrial-grade DSL modem operation in uncontrolled environments. |
Pinout & Package
ISL1557AIRZ-T7 is housed in a thermally enhanced 16-lead 4×4mm QFN package (PKG DWG L16.4x4H) with an exposed thermal pad that must be connected to VS− for optimal thermal performance and electrical stability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 5, 6, 12, 15 | NC | No-connect pins - left floating per datasheet; no internal connection or function. |
| 2 | INA− | Inverting input of Amplifier A - high-impedance node requiring minimal parasitic capacitance for stable current-feedback operation. |
| 3 | INA+ | Non-inverting input of Amplifier A - common-mode voltage range extends to VS− and within 1.5V of VS+. |
| 4 | GND | Ground reference - connects to PCB ground plane; used with thermal pad for heat dissipation path. |
| 7 | VS− | Negative supply - thermal pad must be soldered directly to this pin's net for thermal integrity. |
| 8 | C0 | Bias control pin A - sets IS current level (full/medium/low) when driven to 0V or 5V. |
| 9 | C1 | Bias control pin B - paired with C0 to configure four discrete bias states for dual-amplifier port. |
| 10 | INB+ | Non-inverting input of Amplifier B - forms second half of differential DSL transmit pair. |
| 11 | INB− | Inverting input of Amplifier B - matched to INA− for balanced differential drive. |
| 13 | OUTB | Output of Amplifier B - drives complementary side of transformer-coupled line interface. |
| 14 | VS+ | Positive supply - accepts 4.5V–12V single rail or +6V in dual-supply configuration. |
| 16 | OUTA | Output of Amplifier A - drives primary side of differential line transformer in ADSL/VDSL CPE. |
Key Features
| Feature | Design Value |
|---|---|
| Dual current-feedback architecture | Enables resistor-programmable bandwidth (200–300MHz) without sacrificing slew rate (750–1200 V/µs) or stability across load variations. |
| C0/C1 digital bias control | Four discrete power states (full/medium/low/shutdown) reduce per-amplifier supply current from 15mA to 0.6mA - critical for energy-efficient DSL standby modes. |
| Enhanced output clamping | Robust protection against ±4kV lightning surges per IEC 61000-4-5 Level 3 - eliminates need for external clamp diodes in cost-sensitive CPE designs. |
| Thermal shutdown | Activates at TJ ≥ +150°C and latches off until thermal recovery - prevents permanent damage during sustained overloads or poor heatsinking. |
| QFN-16 with exposed thermal pad | θJA = +52°C/W on JEDEC board - enables >2W power dissipation in compact DSL modem PCB layouts without forced air cooling. |
Applications
| VDSL2 Line Driver | ADSL2+ CPE Modem |
|---|---|
Use Scenario: Full-rate VDSL2 deployment delivering up to 100Mbps downstream over twisted-pair copper lines up to 300m. IC Role / Device Role / Timing Role: Differential line driver generating 20VP-P swing into 21Ω load while maintaining –82dBc THD at 10MHz. Use Value: Enables compliance with ITU-T G.993.2 spectral masks and supports vectoring-capable DSLAM co-location. |
Use Scenario: Residential broadband gateway supporting ADSL2+ Annex A/M with 24Mbps downstream and seamless fallback to G.dmt. IC Role / Device Role / Timing Role: Primary line driver in analog front-end (AFE), configured for 14.5dBm average output power with 5.3 crest factor handling. Use Value: Delivers required SNR margin at loop lengths up to 5.5km while consuming only 6mA per amplifier in low-traffic periods. |
| HDSL2 Repeater | G.SHDSL Transceiver |
Use Scenario: Mid-span repeater in T1/E1-based HDSL2 networks operating at 2.32Mbps over 2–4km loops. IC Role / Device Role / Timing Role: Transmit amplifier providing symmetrical ±4.85V single-ended swing into 50Ω differential load with <10ns rise/fall times. Use Value: Maintains jitter-free symbol timing under temperature cycling (–40°C to +85°C) due to stable bandwidth vs. temperature behavior. |
Use Scenario: Single-pair G.SHDSL transceiver in business-class routers supporting 2.3Mbps–5.6Mbps symmetric rates. IC Role / Device Role / Timing Role: Line driver operating in dual-supply ±6V mode to achieve 21dBm output with –79dBc distortion at 17MHz. Use Value: Meets ETSI EN 300 131-1 Class A emission limits without additional filtering, reducing BOM count. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar xDSL line driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX13212ETA+ | Single-channel, 12V-rated, 600mA output; lacks C0/C1 bias control and thermal shutdown. | Suitable for lower-power ADSL-only designs but not VDSL2 21dBm or multi-mode operation. | Select only if system requires single amplifier per port and can accept higher THD (>–75dBc at 10MHz). |
| THS6222IRHFT | Dual-channel, 12V-rated, 800mA output; uses voltage-feedback topology with fixed 220MHz bandwidth. | Requires external bias resistors and has no integrated clamps - needs discrete surge protection. | Prefer when design prioritizes ultra-low noise (4.5nV/√Hz) over programmable power scaling or transient robustness. |
Compared with MAX13212ETA+ and THS6222IRHFT, the ISL1557AIRZ-T7 uniquely combines dual-channel current-feedback architecture, four-level bias control, integrated lightning clamps, and QFN thermal performance - making it the only option qualified for full-featured VDSL2/ADSL2+ CPE line drivers meeting GR-1089-CORE surge immunity.
Availability
ISL1557AIRZ-T7 is available at Aetrix Electronics and suitable for VDSL2 infrastructure, ADSL2+ customer premises equipment, and HDSL2 repeater applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for ISL1557AIRZ-T7 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
Renesas Electronics is a global semiconductor leader specializing in microcontrollers, analog, power, and connectivity solutions for industrial, automotive, and communications markets.
The ISL1557AIRZ-T7 belongs to Renesas' high-speed line driver product line, designed specifically for DSL physical-layer signal conditioning with emphasis on low distortion, high output current, and robust surge immunity in carrier-class access equipment.
FAQ
What is the maximum differential output voltage swing of the ISL1557AIRZ-T7?
The ISL1557AIRZ-T7 delivers 20VP-P differential output drive into a 21Ω load when operating from a ±6V dual supply. This corresponds to ±10V single-ended swing per output, enabling 21dBm line power in transformer-coupled DSL configurations. The specification is verified under full-bias conditions with RF = 750Ω and AV = +5.
Does the ISL1557AIRZ-T7 support single-supply operation?
Yes, the ISL1557AIRZ-T7 supports single-supply operation from +4.5V to +12V. Input common-mode range extends from VS− to within 1.5V of VS+, so DC biasing or AC coupling is required to keep inputs within valid range. The ISL1557AIRZ-T7 datasheet confirms operation at +12V single supply with 750mA output current and –80dBc distortion at 150kHz.
How does the C0 and C1 pin configuration affect power consumption in the ISL1557AIRZ-T7?
C0 and C1 pins configure four distinct bias states: full bias (C0=C1=0V, 15mA/amp), medium bias (C0=5V, C1=0V, 11mA/amp), low bias (C0=0V, C1=5V, 6mA/amp), and power-down (C0=C1=5V, 0.6–1.0mA/amp). These settings directly scale quiescent current and output drive strength, allowing dynamic power optimization in DSL modems during sleep or low-activity modes.
What package type and thermal characteristics does the ISL1557AIRZ-T7 use?
The ISL1557AIRZ-T7 uses a 16-lead 4×4mm QFN package (L16.4x4H) with an exposed thermal pad that must be connected to VS−. Its thermal resistance is θJA = +52°C/W on a JEDEC-standard test board, enabling >2W power dissipation. This allows reliable operation at full bias in compact DSL modem PCBs without heatsinks or airflow.
Is the ISL1557AIRZ-T7 RoHS compliant and lead-free?
Yes, the ISL1557AIRZ-T7 is Pb-free and RoHS compliant. It uses 100% matte tin plate (e3 termination finish) and Pb-free molding compounds, meeting IPC/JEDEC J-STD-020 reflow profiles. The device is rated MSL3 and compatible with both SnPb and Pb-free soldering processes, as confirmed in Renesas datasheet FN6568 Rev 3.00.
ISL1557AIRZ-T7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 16-VQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Function:
- Line Interface Unit (LIU)
- Interface:
- -
- Number of Circuits:
- 1
- Voltage - Supply:
- 4.5V ~ 13.2V
- Current - Supply:
- 6mA
- Power (Watts):
- -
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-QFN (4x4)
ISL1557AIRZ-T7 FAQ
1.How can I place an order for ISL1557AIRZ-T7 through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL1557AIRZ-T7 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 ISL1557AIRZ-T7 reliable?
The price and inventory of ISL1557AIRZ-T7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL1557AIRZ-T7 is usually 5 days.
3.What payment methods are accepted for ISL1557AIRZ-T7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL1557AIRZ-T7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL1557AIRZ-T7?
ISL1557AIRZ-T7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL1557AIRZ-T7 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 ISL1557AIRZ-T7?
For technical support, including ISL1557AIRZ-T7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL1557AIRZ-T7 requirements.
6.How does Aetrix verify that ISL1557AIRZ-T7 is sourced from the original manufacturer or authorized distributors?
All ISL1557AIRZ-T7 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 ISL1557AIRZ-T7 meets industry standards.
7.What is the process for return or replacement of ISL1557AIRZ-T7?
All ISL1557AIRZ-T7 units undergo pre-shipment inspection (PSI). If there is an issue with ISL1557AIRZ-T7, 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 ISL1557AIRZ-T7 part is unused and in its original packaging.
Return procedure for ISL1557AIRZ-T7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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