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Analog Devices Inc. AD8139ACPZ-R2
- Part No.:
- AD8139ACPZ-R2
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-WFDFN Exposed Pad, CSP
- Datasheet:
-
AD8139ACPZ-R2.pdf
- Description:
- IC OPAMP DIFF 1 CIRCUIT 8LFCSP
- Quantity:
- Payment:
- Shipping:
Inventory:985
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Product details
Overview
AD8139ACPZ-R2 from Analog Devices is a rail-to-rail, low-noise, fully differential ADC driver IC optimized for high-resolution data acquisition systems. It delivers 410 MHz small-signal bandwidth (G = 1), 2.25 nV/√Hz input voltage noise, 98 dBc SFDR at 1 MHz, and 800 V/µs slew rate - enabling clean signal conditioning for 18-bit ADCs in precision instrumentation and communications receivers.
For engineers reviewing the AD8139ACPZ-R2 datasheet, AD8139ACPZ-R2 pinout, AD8139ACPZ-R2 application, or AD8139ACPZ-R2 equivalent, key selection criteria include its adjustable output common-mode voltage (VOCM), ±40°C to +125°C operation, differential-to-differential or single-ended-to-differential configuration flexibility, and validated performance with matched resistor feedback networks.
Technical Context
The AD8139ACPZ-R2 employs an internal H-bridge input stage and rail-to-rail output stages on Analog Devices' second-generation XFCB process, enabling ultralow distortion and high slew rate. Its dual-loop architecture integrates a differential negative feedback path (via external RF/RG) and an internal common-mode feedback loop that forces VO,cm = VOCM while suppressing even-order harmonics and ensuring output balance.
This architecture enables precise control of output common-mode level independent of input common-mode voltage, supports DC-coupled operation, and maintains 69 dB output balance at 1 MHz and 80 dB dc CMRR - critical for rejecting noise in mixed-signal front-ends driving high-speed SAR and sigma-delta ADCs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Small-Signal BW (G = 1) | 410 MHz - supports wideband IF sampling up to ~200 MHz Nyquist zone without gain peaking. |
| Input Voltage Noise | 2.25 nV/√Hz - limits total integrated noise to ~5.8 nV/√Hz at G = 1, preserving SNR for 18-bit ADCs. |
| SFDR @ 1 MHz | 98 dBc - ensures minimal harmonic contamination when digitizing high-fidelity baseband or IF signals. |
| Slew Rate | 800 V/µs - enables full-scale settling in 45 ns to 0.01%, supporting >1 MSPS step response fidelity. |
| Output Balance Error | −69 dB at 1 MHz - guarantees amplitude and phase matching between +OUT and −OUT outputs. |
| Supply Range | ±5 V to ±6 V (or +5 V single supply) - allows flexible biasing in industrial, medical, and test equipment rails. |
| Operating Temp | −40°C to +125°C - qualified for under-hood automotive sensors, downhole tools, and ruggedized DAQ modules. |
Pinout & Package
The AD8139ACPZ-R2 is housed in an 8-lead LFCSP (3 mm × 3 mm) with exposed paddle (EP), optimized for thermal dissipation and high-frequency layout integrity. The package supports JEDEC-standard 4-layer board mounting with θJA = 70°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (−IN) | Inverting Input | Differential summing node; accepts inverted polarity input in single-ended configurations or negative leg of differential input. |
| 2 (VOCM) | Output Common-Mode Control | Directly sets average output voltage (VO,cm); enables level-shifting and interface matching to ADC reference midpoints. |
| 3 (V+) | Positive Supply Rail | Accepts +4.5 V to +6 V (single-supply) or +5 V (dual-supply); decoupling required within 1 cm for stability. |
| 4 (+OUT) | Positive Differential Output | Delivers balanced output voltage referenced to VOCM; drives one side of ADC differential input or filter network. |
| 5 (−OUT) | Negative Differential Output | Complementary output to +OUT; maintains 180° phase inversion and amplitude match for true differential signaling. |
| 6 (V−) | Negative Supply Rail | Accepts −4.5 V to −6 V in dual-supply mode; tied to ground in single-supply +5 V operation with VOCM = 2.5 V. |
| 7 (NIC) | No Internal Connection | Unbonded die pad; must remain floating or grounded per PCB layout guidelines - no electrical function. |
| 8 (+IN) | Noninverting Input | Differential summing node; accepts noninverted input in single-ended configurations or positive leg of differential input. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail output swing | Drives to within 150 mV of supply rails at 80 mA load - maximizes dynamic range into ADC inputs without clipping. |
| Adjustable VOCM | VOCM pin accepts 1.0 V to 3.8 V (at +5 V supply) to set output common-mode level independently of input - simplifies level translation. |
| Internal common-mode feedback | Enforces VO,cm = VOCM with 74–88 dB CMRR and <1 mV offset drift - eliminates need for external trimming or matched resistors. |
| Low harmonic distortion | 98 dBc SFDR at 1 MHz and 72 dBc at 20 MHz - preserves signal purity in wideband receiver chains and spectrum analyzers. |
| High-speed settling | 45 ns to 0.01% with 2 V step - meets timing budget for high-throughput 18-bit SAR ADCs like AD7674 and AD7685. |
Applications
| ADC Driver for 18-bit SAR Converters | Single-Ended-to-Differential Signal Conversion |
|---|---|
Use Scenario: Driving AD7674 (18-bit, 800 kSPS) in precision data loggers for power quality monitoring. IC Role / Device Role / Timing Role: Differential ADC driver providing matched gain, phase, and common-mode control to maximize ENOB and minimize aperture jitter. Use Value: 98 dBc SFDR at 1 MHz ensures >17.5-bit effective resolution; 45 ns settling enables full throughput without cycle loss. |
Use Scenario: Converting single-ended LVCMOS clock or sensor output to differential format for EMI-resistant routing on dense PCBs. IC Role / Device Role / Timing Role: Active balun with programmable VOCM, eliminating transformer-based conversion and enabling DC coupling. Use Value: Adjustable VOCM (1.0–3.8 V) matches ADC input common-mode requirements; 69 dB output balance reduces common-mode radiation. |
| Differential Anti-Aliasing Filter Interface | High-Fidelity IF Signal Conditioning |
Use Scenario: Buffering passive LC or SAW filter outputs before feeding to high-speed ADCs in software-defined radios. IC Role / Device Role / Timing Role: Low-noise, high-Z interface amplifier maintaining filter Q-factor and passband flatness up to 45 MHz (0.1 dB). Use Value: 2.25 nV/√Hz input noise prevents degradation of filter-limited SNR; 410 MHz BW preserves group delay linearity. |
Use Scenario: Digitizing 70 MHz IF signals in radar receivers requiring >90 dB SFDR across 10–20 MHz bandwidths. IC Role / Device Role / Timing Role: Wideband differential driver delivering linear, low-distortion signal to ADC front-end with minimal added noise floor. Use Value: 85 dBc SFDR at 5 MHz and 75 dBc at 20 MHz (VS = +5 V) supports high dynamic range detection of weak targets amid strong clutter. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar differential ADC driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| THS4561IRGET | Lower noise (1.6 nV/√Hz), lower BW (1.8 GHz small-signal but degrades above 500 MHz under load), fixed VOCM = VCC/2 unless externally buffered. | Better for ultra-low-noise sub-100 MHz applications; less flexible VOCM control limits interface adaptability with diverse ADCs. | Choose THS4561IRGET when absolute minimum input noise dominates over VOCM flexibility and wideband flatness. |
| ADA4941-1ARMZ | Lower power (10.5 mA IQ), lower BW (55 MHz), rail-to-rail input, but only 75 dBc SFDR at 1 MHz and no internal VOCM feedback loop. | Suitable for battery-powered, lower-speed precision DAQ; lacks AD8139ACPZ-R2's high-speed balance and distortion suppression. | Choose ADA4941-1ARMZ for portable 16-bit systems where power efficiency and input range exceed speed/noise requirements. |
Compared with THS4561IRGET and ADA4941-1ARMZ, the AD8139ACPZ-R2 uniquely combines 410 MHz bandwidth, 2.25 nV/√Hz noise, internal VOCM feedback, and 98 dBc SFDR - making it the only option among the three qualified for demanding 18-bit, multi-MSPS ADC interfaces requiring both speed and spectral purity.
Availability
AD8139ACPZ-R2 is available at Aetrix Electronics and suitable for precision data acquisition, high-speed communications infrastructure, and industrial test equipment requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for AD8139ACPZ-R2 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 Wilmington, MA, with design and manufacturing expertise spanning over 50 years.
The AD8139ACPZ-R2 belongs to Analog Devices' high-speed differential amplifier product line, engineered specifically for precision, wideband signal conditioning in data converter interfaces - emphasizing low noise, high SFDR, and robust common-mode control.
FAQ
What is the maximum operating temperature for the AD8139ACPZ-R2?
The AD8139ACPZ-R2 is rated for continuous operation from −40°C to +125°C ambient temperature. This rating is validated across all electrical specifications in the datasheet, including SFDR, bandwidth, and output balance. Thermal derating is not required within this range when mounted on a 4-layer PCB with proper exposed paddle grounding per Analog Devices' layout guidelines.
Can the AD8139ACPZ-R2 operate from a single +5 V supply?
Yes, the AD8139ACPZ-R2 supports single-supply operation at +5 V with VOCM biased to 2.5 V. In this configuration, V− is connected to ground, and the output swing extends from 0.10 V to 4.90 V (typical) per output. Input common-mode range becomes 1.0 V to 4.0 V, and key specs such as 99 dBc SFDR at 1 MHz and 540 V/µs slew rate are maintained per Table 2 of the datasheet.
How does the VOCM pin affect output balance in the AD8139ACPZ-R2?
The VOCM pin directly controls the output common-mode voltage (VO,cm) via an internal feedback loop that samples the midpoint of +OUT and −OUT. This loop actively suppresses common-mode errors and enforces output balance - measured as −69 dB at 1 MHz - independent of external resistor matching. VOCM voltage changes do not degrade balance; instead, they shift both outputs symmetrically while preserving amplitude and phase matching.
What is the recommended feedback network for G = 2 with the AD8139ACPZ-R2?
For G = 2, Analog Devices recommends RG = 200 Ω and RF = 400 Ω (1% tolerance, low-inductance metal film). This yields 160 MHz small-signal bandwidth and 9.3 nV/√Hz total output noise. Layout must place resistors close to pins 1/8 (inputs) and 4/5 (outputs), use short traces, and avoid vias in feedback paths to preserve stability and bandwidth - as verified in Figure 10 and Table 6 of the AD8139 datasheet.
Does the AD8139ACPZ-R2 require external compensation capacitors?
No, the AD8139ACPZ-R2 is internally compensated and stable with purely resistive feedback networks. However, when driving capacitive loads (>2 pF), a small series resistor (10–47 Ω) per output is recommended to dampen high-frequency ringing - as shown in Figure 58 and Figure 63. This resistor does not require compensation capacitor addition and preserves 45 ns settling time to 0.01%.
AD8139ACPZ-R2 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-WFDFN Exposed Pad, CSP
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- Differential
- Number of Circuits:
- 1
- Output Type:
- Differential, Rail-to-Rail
- Slew Rate:
- 800V/µs
- Gain Bandwidth Product:
- -
- -3db Bandwidth:
- 410 MHz
- Current - Input Bias:
- 2.25 µA
- Voltage - Input Offset:
- 150 µV
- Current - Supply:
- 24.5mA
- Current - Output / Channel:
- 100 mA
- Voltage - Supply Span (Min):
- 4.5 V
- Voltage - Supply Span (Max):
- 12 V
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-LFCSP (3x3)
AD8139ACPZ-R2 FAQ
1.How can I place an order for AD8139ACPZ-R2 through Aetrix?
Please submit a Request for Quotation (RFQ) for AD8139ACPZ-R2 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 AD8139ACPZ-R2 reliable?
The price and inventory of AD8139ACPZ-R2 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD8139ACPZ-R2 is usually 5 days.
3.What payment methods are accepted for AD8139ACPZ-R2?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD8139ACPZ-R2 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD8139ACPZ-R2?
AD8139ACPZ-R2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD8139ACPZ-R2 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 AD8139ACPZ-R2?
For technical support, including AD8139ACPZ-R2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD8139ACPZ-R2 requirements.
6.How does Aetrix verify that AD8139ACPZ-R2 is sourced from the original manufacturer or authorized distributors?
All AD8139ACPZ-R2 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 AD8139ACPZ-R2 meets industry standards.
7.What is the process for return or replacement of AD8139ACPZ-R2?
All AD8139ACPZ-R2 units undergo pre-shipment inspection (PSI). If there is an issue with AD8139ACPZ-R2, 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 AD8139ACPZ-R2 part is unused and in its original packaging.
Return procedure for AD8139ACPZ-R2:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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