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Analog Devices Inc. AD8264ACPZ-RL
- Part No.:
- AD8264ACPZ-RL
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 40-WFQFN Exposed Pad, CSP
- Datasheet:
-
AD8264ACPZ-RL.pdf
- Description:
- IC VARIABLE GAIN 4 CIRC 40LFCSP
- Quantity:
- Payment:
- Shipping:
Inventory:2,462
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Product details
Overview
AD8264ACPZ-RL from Analog Devices is a quad-channel, DC-coupled, linear-in-dB variable gain amplifier (VGA) with integrated differential output buffers. It delivers 235 MHz small-signal bandwidth at the VGA stage, 0–24 dB gain range (input to VGA output), 2.3 nV/√Hz input voltage noise, ±2.5 V to ±5 V dual supply operation, and supports pulse processing in medical ultrasound and radar receivers.
For engineers reviewing the AD8264ACPZ-RL datasheet, AD8264ACPZ-RL pinout, AD8264ACPZ-RL application, or AD8264ACPZ-RL equivalent, this page provides verified circuit role, channel-to-channel matching (±0.1–±0.25 dB), gain scaling (20 dB/V), differential output common-mode control (VOCM), and preamp/VGA/output stage bandwidth partitioning for high-fidelity wideband signal conditioning.
Technical Context
The AD8264ACPZ-RL integrates four independent channels, each comprising a single-ended-input preamp/VGA section followed by a 6 dB fixed-gain differential output buffer. The VGA uses a linear-in-dB architecture with precise 20 dB/V gain scaling referenced to GNLO, enabling accurate gain control across −0.7 V to +0.7 V VGAIN.
Each channel features independent gain adjustment, shared GNLO reference, VOCM-controlled common-mode level, OFSx-adjustable differential offset, and DC-coupled signal path from input through VGA to differential outputs (VOHx/VOLx), supporting direct interface to high-speed ADCs without AC coupling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Small-signal BW (VGA) | 235 MHz - preserves fidelity of fast pulses up to ~1.5 ns rise time in PET or ultrasound front-ends. |
| Small-signal BW (Diff Out) | 80 MHz - sufficient for 12-bit+ ADC sampling up to 160 MSPS with <±1 ns group delay variation. |
| Gain range (VGA out) | 0 to 24 dB - enables 16× amplitude scaling for dynamic range optimization in multichannel data acquisition. |
| Gain scaling factor | 20 dB/V (±0.5 dB) - allows precise analog gain programming via DAC or potentiometer with <0.1 dB error over temperature. |
| Input voltage noise | 2.3 nV/√Hz - ensures low-noise amplification of weak photodiode/PMT signals without degrading SNR. |
| Power per channel | 140 mW at ±3.3 V - balances performance and thermal load in dense quad-channel PCB layouts. |
| Channel matching | ±0.1 to ±0.25 dB (−40°C to +105°C) - critical for coherent beamforming in phased-array ultrasound systems. |
Pinout & Package
AD8264ACPZ-RL is housed in a 40-lead LFCSP (7 mm × 7 mm, 0.85 mm height) with exposed pad (Pin 0) requiring solder connection to PCB ground plane for RF stability and thermal dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IPP1–IPP4 | Positive preamp input (x4) | High-Z (4.2 MΩ), 2 pF input capacitance; accepts single-ended sensor signals (e.g., PMT anode). |
| IPN1–IPN4 | Negative preamp input (x4) | Internally grounded reference node; enables true differential input when used with external resistive network. |
| VGA1–VGA4 | VGA output (x4) | Low-impedance (3.5 Ω) buffered output; drives 500 Ω loads with 380 V/µs slew rate for 2 Vp-p. |
| VOH1–VOH4 / VOL1–VOL4 | Diff output positive/negative (x4) | Matched 6 dB gain stage; sub-1 Ω output impedance enables direct 50 Ω termination into ADC inputs. |
| VOCM | Common-mode voltage control | Sets VOHx/VOLx midpoint (−1.4 V to +1.4 V); ties to ADC reference for dc-coupled level alignment. |
| OFS1–OFS4 | Differential offset control (x4) | Adjusts dc offset at diff output independently per channel; matches ADC input common-mode range. |
| GNH1–GNH4 / GNLO | Gain control voltage (x4) / reference | 20 dB/V scaling; GNLO is global reference; GNHx–GNLO = VGAIN determines gain with ±0.25 dB conformance. |
| VPOS / VNEG | Positive/negative supply (tied internally) | ±2.5 V to ±5 V bipolar operation; enables negative pulse amplification from current-sinking sensors. |
| COMM (Pins 0, 12, 39) | Ground | Exposed pad (Pin 0) must be soldered to solid ground plane for EMI suppression and thermal management. |
Key Features
| Feature | Design Value |
|---|---|
| DC-coupled signal path | Enables baseband pulse processing without high-pass distortion-critical for time-of-flight accuracy in PET and radar. |
| Quad-channel independence | Each channel has dedicated GNHx, OFSx, VOCM, and VGA/diff output; supports per-channel gain trim in active calibration systems. |
| Linear-in-dB gain law | 20 dB/V scaling with ±0.2 dB conformance over −0.5 V to +0.5 V VGAIN ensures predictable logarithmic compression for wide-dynamic-range signals. |
| Low-noise preamp stage | 2.3 nV/√Hz voltage noise + 2 pA/√Hz current noise optimizes SNR for high-impedance sources like photomultipliers. |
| Differential output buffer | 6 dB fixed gain, <1 Ω output impedance, and VOCM/OFSx controls allow seamless interfacing to modern pipeline or sigma-delta ADCs. |
Applications
| Medical Ultrasound Beamforming | Positron Emission Tomography (PET) |
|---|---|
Use Scenario: Amplifying and gain-matching echo signals from 128+ transducer elements before digitization. IC Role / Device Role / Timing Role: Quad VGA per module provides per-channel programmable gain with <±0.25 dB matching to maintain beam coherence and spatial resolution. Use Value: Enables real-time dynamic range compression while preserving pulse shape integrity up to 235 MHz for harmonic imaging modes. |
Use Scenario: Conditioning scintillation detector pulses (1–10 ns width) from LYSO or BGO crystals. IC Role / Device Role / Timing Role: DC-coupled VGA amplifies fast negative pulses from photomultiplier tubes without baseline shift or droop. Use Value: 235 MHz bandwidth and 25 ns overload recovery support precise time-of-flight measurement with <100 ps jitter contribution. |
| Radar Receiver Front-End | Industrial Multichannel Data Acquisition |
Use Scenario: Variable gain amplification of IF or baseband radar returns prior to ADC sampling. IC Role / Device Role / Timing Role: Differential output drives ADC with matched VOHx/VOLx timing, minimizing skew-induced phase errors in coherent detection. Use Value: 80 MHz differential output bandwidth and ±1 ns group delay variation ensure <0.1° phase error across L-band radar IF spectrum. |
Use Scenario: Signal conditioning in automated test equipment with simultaneous 16-channel analog input. IC Role / Device Role / Timing Role: Four AD8264ACPZ-RL devices provide 16 independent, calibrated gain paths with shared GNLO for synchronized gain sweeps. Use Value: 24 dB gain range and 20 dB/V scaling simplify analog front-end calibration using single multi-channel DAC. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar variable gain amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD8367ARUZ | Single-channel, 500 MHz BW, 45 dB gain range, 5.5 dB noise figure; no integrated differential output buffer. | Requires external differential driver for ADC interface; better suited for RF/IF gain control than baseband pulse processing. | Select when higher bandwidth and wider gain range outweigh need for integrated diff output and quad integration. |
| LMH6401IRGTR | Single-channel, 1.7 GHz BW, 30 dB gain range, 10.5 dBm OIP3; current-feedback architecture, no VOCM/OFSx controls. | Lacks per-channel offset/common-mode tuning; optimized for RF/communications, not precision pulse amplification. | Choose for GHz-frequency applications where AD8264ACPZ-RL's 235 MHz VGA BW is insufficient. |
Compared with AD8264ACPZ-RL, AD8367ARUZ offers broader bandwidth but requires external components for differential ADC drive, while LMH6401IRGTR delivers RF-grade linearity at the cost of missing DC-coupled precision features essential for time-critical pulse systems.
Availability
AD8264ACPZ-RL is available at Aetrix Electronics and suitable for medical imaging systems, radar receivers, and industrial multichannel data acquisition requiring stable component supply, long-term lifecycle support, and guaranteed traceability.
Supply support for AD8264ACPZ-RL 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 AD8264ACPZ-RL belongs to Analog Devices' precision wideband amplifier product line, designed specifically for DC-coupled, multichannel pulse amplification in medical, scientific, and defense instrumentation.
FAQ
What is the maximum operating temperature range for AD8264ACPZ-RL?
The AD8264ACPZ-RL is rated for continuous operation from −40°C to +105°C. At supplies greater than ±3.3 V, the upper limit is restricted to +85°C per the Absolute Maximum Ratings table. Thermal resistance (θJA) is 31.0°C/W on a 4-layer JEDEC board, requiring adequate copper pour under the exposed pad for reliable high-temperature performance.
Does AD8264ACPZ-RL support single-supply operation?
No, AD8264ACPZ-RL requires dual ±2.5 V to ±5 V supplies and does not support true single-supply operation. Its architecture relies on bipolar rails to handle negative input pulses from photomultiplier tubes and to maintain symmetric headroom for DC-coupled differential outputs. Attempting single-supply use violates absolute maximum ratings and disables proper functionality.
How is gain controlled on AD8264ACPZ-RL, and what is the gain intercept?
Gain is controlled by applying a voltage difference (VGAIN = GNHx − GNLO) across each channel's GNHx and GNLO pins. The gain scaling is 20 dB/V, with a VGA-stage intercept of 11.9 dB (±0.4 dB). For example, VGAIN = 0.5 V yields ~22 dB gain at the VGA output. The differential output adds a fixed +6 dB, resulting in 28 dB total from input to VOHx/VOLx.
Can AD8264ACPZ-RL drive a 50 Ω ADC input directly?
Yes-AD8264ACPZ-RL's differential output stage has <1 Ω output impedance and supports direct 50 Ω termination. To drive a 50 Ω ADC input, connect VOHx and VOLx to the ADC's differential inputs via 50 Ω series resistors (or 25 Ω if AC-coupled), and set VOCM to match the ADC's common-mode reference voltage. No external transformer or balun is required.
What is the purpose of the OFSx pins on AD8264ACPZ-RL?
The OFS1–OFS4 pins set the differential output offset voltage independently per channel. They serve as the noninverting input to the differential amplifier stage, allowing fine-tuning of the VOHx/VOLx dc level to align with the ADC's input common-mode range. This eliminates dc offset errors in fully DC-coupled signal chains and supports active calibration in multichannel systems.
AD8264ACPZ-RL Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 40-WFQFN Exposed Pad, CSP
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- Variable Gain
- Number of Circuits:
- 4
- Output Type:
- Differential
- Slew Rate:
- 380V/µs
- Gain Bandwidth Product:
- -
- -3db Bandwidth:
- 235 MHz
- Current - Input Bias:
- 5 µA
- Voltage - Input Offset:
- -
- Current - Supply:
- 99mA
- Current - Output / Channel:
- -
- Voltage - Supply Span (Min):
- 4.5 V
- Voltage - Supply Span (Max):
- 10 V
- Operating Temperature:
- -40°C ~ 105°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 40-LFCSP-WQ (6x6)
AD8264ACPZ-RL FAQ
1.How can I place an order for AD8264ACPZ-RL through Aetrix?
Please submit a Request for Quotation (RFQ) for AD8264ACPZ-RL 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 AD8264ACPZ-RL reliable?
The price and inventory of AD8264ACPZ-RL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD8264ACPZ-RL is usually 5 days.
3.What payment methods are accepted for AD8264ACPZ-RL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD8264ACPZ-RL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD8264ACPZ-RL?
AD8264ACPZ-RL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD8264ACPZ-RL 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 AD8264ACPZ-RL?
For technical support, including AD8264ACPZ-RL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD8264ACPZ-RL requirements.
6.How does Aetrix verify that AD8264ACPZ-RL is sourced from the original manufacturer or authorized distributors?
All AD8264ACPZ-RL 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 AD8264ACPZ-RL meets industry standards.
7.What is the process for return or replacement of AD8264ACPZ-RL?
All AD8264ACPZ-RL units undergo pre-shipment inspection (PSI). If there is an issue with AD8264ACPZ-RL, 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 AD8264ACPZ-RL part is unused and in its original packaging.
Return procedure for AD8264ACPZ-RL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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