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Analog Devices Inc. AD8326ARP
- Part No.:
- AD8326ARP
- Manufacturer:
- Analog Devices Inc.
- Package:
- 28-SOIC (0.295", 7.50mm Width) Exposed Pad
- Datasheet:
-
AD8326ARP.pdf
- Description:
- IC LINE DVR CATV PROG 28-PSOP
- Quantity:
- Payment:
- Shipping:
Inventory:7,858
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Product details
Overview
AD8326ARP from Analog Devices is a high-output-power, digitally programmable CATV line driver IC optimized for DOCSIS-compliant upstream transmission in cable modems and telephony systems. It delivers +67 dBmV output into 75 Ω, supports 53.5 dB gain range in 0.75 dB steps, achieves –59 dBc SFDR at 21 MHz, and operates from a single +12 V supply in thermally enhanced PSOP2 package.
For engineers reviewing the AD8326ARP datasheet, AD8326ARP pinout, AD8326ARP application, or AD8326ARP equivalent, this page provides verified specifications, thermal-aware package details, DOCSIS-compliant distortion performance, SPI-controlled gain programming, and validated alternatives for coaxial line driving designs requiring stable 12 V operation and 100 MHz bandwidth.
Technical Context
The AD8326ARP integrates a low-noise fixed-gain buffer, an 8-bit digitally controlled vernier attenuator (0–5.25 dB), an 8-bit DAC-based bulk attenuator (0–48 dB), and a low-distortion power amplifier - all configured to drive 75 Ω coaxial loads with matched differential output impedance. Its architecture maintains constant 75 Ω output Z across transmit enable/disable/sleep modes without external termination.
Gain control uses TTL/CMOS-compatible 3-wire SPI (DATEN, SDATA, CLK) with MSB-first 8-bit serial loading; the eighth bit is ignored. The device implements DOCSIS 4.2.10.2 spurious emission compliance during burst transients and features <4 mA sleep-mode quiescent current with 40 ns transmit disable response time.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain Range | 53.5 dB total (–26 dB to +27.5 dB), enabling precise upstream power leveling across varying cable plant losses |
| Gain Step Size | 0.7526 dB/LSB - ensures fine-grained, repeatable output amplitude control for QPSK/QAM modulation fidelity |
| Output Power | +67 dBmV into 75 Ω at max gain - meets DOCSIS upstream power requirements for 12 V systems |
| Harmonic Distortion | –59 dBc worst-case at 21 MHz, –57 dBc at 42 MHz - satisfies MCNS-DOCSIS spectral purity mandates |
| Bandwidth | 100 MHz (–3 dB) across full gain range - supports upstream channels up to 65 MHz with ≤1.2 dB roll-off |
| Supply Voltage | +11.4 V to +12.6 V - compatible with standard 12 V rail with ±5% tolerance and multi-pin VCC distribution |
| Quiescent Current | 157 mA typical in TXEN=1 mode; 4 mA in SLEEP mode - enables burst-mode power management in cable telephony |
Pinout & Package
The AD8326ARP is housed in a 28-lead thermally enhanced PSOP2 package with exposed slug for low thermal resistance (23°C/W on SEMI 4-layer board). Pin 28 and the exposed pad must be soldered directly to PCB ground plane for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| DATEN | Data Enable (active-low) | Controls latch/shift register transfer; rising edge updates gain, falling edge enables serial load - critical for glitch-free gain transitions |
| SDATA | Serial Data Input | MSB-first 8-bit gain word input; eighth bit ignored - requires setup/hold timing per Figure 2 (tDS = 5 ns, tDH = 5 ns) |
| CLK | Serial Clock Input | Drives internal shift register; min 32 ns period (31.25 MHz max rate) - synchronizes gain code loading with system clock domain |
| VIN+, VIN– | Differential Input Terminals | 1.6 kΩ differential / 800 Ω single-ended input Z; DC-biased to ~VCC/2 - requires AC coupling via 0.1 µF capacitors |
| VOUT+, VOUT– | Differential Output Terminals | Internally regulated 75 Ω differential output Z - eliminates need for external back-termination resistors in coaxial interface |
| TXEN | Transmit Enable Control | Logic high enables output stage; 40 ns tOFF ensures fast burst shutdown - essential for DOCSIS TDMA upstream slot timing |
| SLEEP | Low-Power Mode Control | Reduces IQ to 4 mA while maintaining high-Z output - enables system-level power gating without signal leakage |
| BYP | Internal Bypass Node | Must be AC-coupled to ground via 0.1 µF capacitor - stabilizes internal bias network and suppresses supply noise |
Key Features
| Feature | Design Value |
|---|---|
| DOCSIS-Compliant Spurious Emissions | Meets paragraph 4.2.10.2 for burst-on/off transients - eliminates need for external filtering in certified modem designs |
| Thermally Enhanced PSOP2 Package | 23°C/W junction-to-board thermal resistance - enables +67 dBmV continuous output at +85°C ambient without derating |
| Matched Differential Output Impedance | 75 Ω ±20% maintained in TXEN=1, TXEN=0, and SLEEP modes - ensures consistent return loss across all operating states |
| Fast Gain Switching | 60 ns settling time from min to max gain - supports dynamic upstream channel bonding and adaptive power control |
| Input Signal Isolation | –85 dBc isolation at 65 MHz when TXEN=0 - prevents upstream signal leakage into receiver path during idle slots |
Applications
| Cable Modem Upstream PA | CATV Telephony Modem |
|---|---|
Use Scenario: Amplifying QPSK/QAM upstream signals from DSP/modulator to headend over 100+ m coaxial drop cable with variable attenuation. IC Role / Device Role / Timing Role: Digitally programmable line driver providing precise +67 dBmV output level control to compensate for cable length and splitter losses. Use Value: Enables DOCSIS-compliant upstream transmission with –59 dBc SFDR at 21 MHz and 100 MHz bandwidth - meeting MCNS spectral mask requirements. | Use Scenario: Driving upstream voice-band signals (5–40 MHz) in dual-service cable modems supporting VoIP and data simultaneously. IC Role / Device Role / Timing Role: High-linearity, low-noise amplifier with 16.6 dB noise figure and 0.75 dB step resolution for adaptive voice signal boosting. Use Value: Delivers –45 dBmV noise floor in 160 kHz bandwidth and 26.5 dBm 1 dB compression - preserving SNR for narrowband telephony channels. |
| DOCSIS Terminal Device | Digitally Controlled Gain Block |
Use Scenario: Serving as upstream power amplifier in embedded cable set-top boxes or eMTA devices requiring compact, thermally robust analog front-end. IC Role / Device Role / Timing Role: Thermally enhanced PSOP2-packaged driver delivering +67 dBmV into 75 Ω with integrated 75 Ω output Z matching. Use Value: Eliminates external termination resistors and reduces PCB area vs. discrete solutions - simplifies layout and improves impedance stability. | Use Scenario: Replacing analog potentiometer-based gain stages in test equipment, broadband receivers, or signal generators requiring digital amplitude control. IC Role / Device Role / Timing Role: SPI-programmable variable gain block with 53.5 dB range, 0.75 dB steps, and 60 ns gain switching. Use Value: Provides repeatable, drift-free gain adjustment without mechanical wear or temperature-induced calibration drift - ideal for automated test systems. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar digitally controlled CATV line driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD8326ARE | Dual ±5 V or single 10 V supply; TSSOP-28 with exposed pad; +65 dBmV max output; 39°C/W thermal resistance | Lower power dissipation and smaller footprint for cost-sensitive, lower-output applications | Select AD8326ARE when system uses ±5 V rails and output power ≤ +65 dBmV is sufficient |
| MAX3543ETJ+ | Single +5 V supply; 32-pin TQFN; +63 dBmV output; integrated 75 Ω output Z; SPI interface; 50 MHz bandwidth | Narrower bandwidth and lower output power; optimized for low-voltage, space-constrained designs | Select MAX3543ETJ+ for 5 V systems where 65 MHz DOCSIS support is not required |
Compared with AD8326ARE and MAX3543ETJ+, the AD8326ARP delivers higher output (+67 dBmV), superior high-frequency linearity (–57 dBc at 42 MHz), and lower thermal resistance (23°C/W), making it the optimal choice for 12 V DOCSIS 3.0/3.1 upstream amplifiers demanding full 100 MHz bandwidth and thermal resilience.
Availability
AD8326ARP is available at Aetrix Electronics and suitable for DOCSIS-compliant cable modems, CATV telephony systems, and embedded terminal devices requiring stable component supply, long-term lifecycle support, and guaranteed thermal performance in 12 V analog front-ends.
Supply support for AD8326ARP 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 communications, industrial, and automotive markets with precision signal chain solutions.
The AD8326 product line was designed specifically for DOCSIS upstream line driving - delivering programmable gain, low distortion, and thermal robustness in coaxial infrastructure equipment where spectral purity and output power stability are mission-critical.
FAQ
What is the maximum output power of the AD8326ARP and under what conditions?
The AD8326ARP delivers +67 dBmV into a 75 Ω load at maximum gain when operated from a +12 V supply at TA = 25°C. This is verified per the datasheet's "AD8326ARP" specification table under OUTPUT CHARACTERISTICS, with worst-case harmonic distortion of –59 dBc at 21 MHz. Performance remains compliant across the full –40°C to +85°C operating range with appropriate thermal layout.
Does the AD8326ARP require external output termination resistors?
No. The AD8326ARP maintains a differential output impedance of 75 Ω ±20% in all operating modes (TXEN=1, TXEN=0, and SLEEP), eliminating the need for external back-termination resistors. This is confirmed in the "Differential Output Impedance" row of the AD8326ARP specifications table and reinforced in the General Description section stating it "maintains 75 Ω output impedance."
What is the gain control interface type and timing requirement for the AD8326ARP?
The AD8326ARP uses a 3-wire SPI-compatible interface (DATEN, SDATA, CLK) with MSB-first 8-bit serial loading. Minimum clock period is 32 ns (31.25 MHz max), setup time (tDS) is 5 ns, and hold time (tDH) is 5 ns - all specified in the TIMING REQUIREMENTS table. DATEN rising edge latches the gain word into the attenuator core.
How does the AD8326ARP support DOCSIS compliance?
The AD8326ARP complies with DOCSIS paragraph 4.2.10.2 for "Spurious Emissions During Burst On/Off Transients" and supports upstream transmission per MCNS-DOCSIS standards. Its fast 40 ns transmit disable response time, –85 dBc signal isolation in TXEN=0 mode, and –59 dBc SFDR at 21 MHz collectively ensure spectral mask conformance in burst-mode cable systems.
What thermal design practices are required for reliable AD8326ARP operation at full output?
Reliable AD8326ARP operation at +67 dBmV requires soldering Pin 28 and the exposed thermal slug directly to a low-impedance PCB ground plane, using thermal vias ("stitching") beneath the pad, and dedicating ≥2.9 in² of copper area. These practices achieve the rated 23°C/W thermal resistance and prevent junction temperature exceedance per the Absolute Maximum Ratings and Thermal Layout Considerations sections.
AD8326ARP Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 28-SOIC (0.295", 7.50mm Width) Exposed Pad
- Packaging:
- Tube
- Product Status:
- Obsolete
- Logic Type:
- -
- Number of Elements:
- -
- Number of Bits per Element:
- -
- Input Type:
- -
- Output Type:
- -
- Current - Output High, Low:
- -
- Voltage - Supply:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-PSOP
AD8326ARP FAQ
1.How can I place an order for AD8326ARP through Aetrix?
Please submit a Request for Quotation (RFQ) for AD8326ARP 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 AD8326ARP reliable?
The price and inventory of AD8326ARP are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD8326ARP is usually 5 days.
3.What payment methods are accepted for AD8326ARP?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD8326ARP transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD8326ARP?
AD8326ARP orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD8326ARP 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 AD8326ARP?
For technical support, including AD8326ARP datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD8326ARP requirements.
6.How does Aetrix verify that AD8326ARP is sourced from the original manufacturer or authorized distributors?
All AD8326ARP 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 AD8326ARP meets industry standards.
7.What is the process for return or replacement of AD8326ARP?
All AD8326ARP units undergo pre-shipment inspection (PSI). If there is an issue with AD8326ARP, 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 AD8326ARP part is unused and in its original packaging.
Return procedure for AD8326ARP:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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