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Analog Devices Inc. AD8138AR-REEL7
- Part No.:
- AD8138AR-REEL7
- Manufacturer:
- Analog Devices Inc.
- Category:
- Special Purpose Amplifiers
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AD8138AR-REEL7.pdf
- Description:
- IC ADC DRIVER 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,568
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Product details
Overview
AD8138AR-REEL7 from Analog Devices is a high-speed, low-distortion differential ADC driver IC designed for single-ended-to-differential signal conversion in precision data acquisition systems. It delivers −94 dBc SFDR at 5 MHz, 320 MHz −3 dB bandwidth (±5 V supply), 1150 V/µs slew rate, and adjustable output common-mode voltage via VOCM pin - enabling direct interface with single-supply, high-resolution ADCs.
For engineers reviewing the AD8138AR-REEL7 datasheet, AD8138AR-REEL7 pinout, AD8138AR-REEL7 application, or AD8138AR-REEL7 equivalent, key selection criteria include differential output balance error (−66 dB), fast 4 ns overdrive recovery, 5 nV/√Hz input voltage noise, 16 ns 0.01% settling time, and SOIC-8 packaging compatibility with industrial temperature range (−40°C to +85°C).
Technical Context
The AD8138AR-REEL7 employs a dual-feedback architecture: one loop controls differential output voltage using external resistors (RG/RF), while a separate internal common-mode feedback loop forces output common-mode voltage to precisely track the VOCM input voltage (1:1 ratio). This eliminates reliance on external resistor matching for balance.
It operates as a voltage-feedback amplifier with high open-loop gain, supporting both single-ended input (to differential output) and differential input (to differential output) configurations. Its XFCB bipolar process enables wide bandwidth, low harmonic distortion, and robust performance across ±1.4 V to ±5.5 V or 2.7 V to 11 V supply ranges.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| −3 dB Bandwidth | 320 MHz at ±5 V supply - supports high-frequency IF/baseband signal chains up to 70 MHz with usable dynamic range. |
| SFDR @ 5 MHz | −94 dBc - preserves integrity of 14–16-bit ADC conversions without spectral contamination. |
| Slew Rate | 1150 V/µs - ensures faithful reproduction of fast transient signals without slewing-induced distortion. |
| Settling Time | 16 ns to 0.01% - meets timing budgets for high-speed sampling in >50 MSPS data converters. |
| Output Balance Error | −66 dB - minimizes even-order harmonics and common-mode feedthrough into ADC inputs. |
| VOCM Tracking Gain | 0.9955–1.0045 V/V - enables precise dc level-shifting of differential outputs to match ADC input range. |
| Input Voltage Noise | 5 nV/√Hz - contributes minimal noise in front-end gain stages before ADC quantization. |
| Supply Range | ±1.4 V to ±5.5 V or 2.7 V to 11 V - supports both dual-rail and single-rail operation in mixed-signal systems. |
Pinout & Package
AD8138AR-REEL7 is housed in an 8-lead SOIC package (JEDEC MS-012AA, body size 4.9 mm × 3.9 mm × 1.75 mm), optimized for thermal performance (θJA = 121°C/W on 4-layer board) and PCB layout simplicity in high-speed analog designs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: −IN | Negative input summing node | Inverts positive input signal at +OUT; forms differential input pair with +IN for balanced signal processing. |
| 2: VOCM | Common-mode output control input | Sets dc bias of both +OUT and −OUT identically (1:1 ratio); enables level-shifting for single-supply ADC interfacing. |
| 3: V+ | Positive supply rail | Accepts +2.7 V to +5.5 V (single) or +5 V (dual); decoupling required within 1 cm for stability. |
| 4: +OUT | Positive differential output | Provides inverted replica of −IN signal; paired with −OUT to deliver fully differential output swing up to 7.75 V p-p. |
| 5: −OUT | Negative differential output | Provides inverted replica of +IN signal; complements +OUT to achieve matched amplitude and 180° phase relationship. |
| 6: V− | Negative supply rail | Accepts −5.5 V to 0 V (single) or −5 V (dual); must be referenced to same ground as V+ for proper common-mode rejection. |
| 7: NC | No connect | Internally unconnected; must remain floating - no routing or grounding permitted. |
| 8: +IN | Positive input summing node | Non-inverting input for differential mode; defines gain and common-mode rejection when used with −IN. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent feedback loops | Separately regulates differential gain (via external RG/RF) and output common-mode voltage (via VOCM), eliminating need for precision-matched resistors. |
| Fast overdrive recovery | 4 ns recovery from saturation preserves sampling accuracy during ADC input overload conditions. |
| Low harmonic distortion | −94 dBc second harmonic at 5 MHz enables clean driving of 14–16-bit ADCs without post-conversion correction. |
| Adjustable gain configuration | Externally set via standard resistor networks (e.g., RG = RF = 499 Ω for G = +1); supports gains from +1 to +10. |
| Wide supply flexibility | Operates from ±1.4 V to ±5.5 V or single 2.7 V to 11 V rails - simplifies power architecture in mixed-signal systems. |
| Industrial temperature range | Specified from −40°C to +85°C - suitable for base station, test equipment, and industrial DAQ applications. |
Applications
| High-Speed Data Acquisition | Communications IF Signal Chain |
|---|---|
Use Scenario: Driving 14-bit, 100 MSPS pipeline ADC in automated test equipment requiring full-scale analog input fidelity. IC Role / Device Role / Timing Role: Single-ended-to-differential converter and gain block that replaces RF transformer, preserving dc and low-frequency response while rejecting common-mode noise. Use Value: −94 dBc SFDR at 5 MHz and 16 ns settling ensure >86 dB SNR and <0.5 LSB integral nonlinearity error in final digitized waveform. | Use Scenario: Amplifying and conditioning 45 MHz IF signal from mixer output prior to demodulation in LTE femtocell receiver. IC Role / Device Role / Timing Role: Differential gain block with 320 MHz bandwidth and 37 dBm IP3, providing linear amplification without introducing adjacent-channel interference. Use Value: 225 MHz bandwidth with 1 pF capacitive load and −77 dBc IMD at 20 MHz maintain EVM compliance under high crest-factor LTE signals. |
| Single-Supply ADC Interface | Baseband Signal Conditioning |
Use Scenario: Level-shifting and buffering sensor output (0–2.5 V) to match input range of 3.3 V supply SAR ADC in medical imaging front-end. IC Role / Device Role / Timing Role: Differential driver with VOCM-controlled common-mode offset, eliminating need for external biasing networks or ac-coupling. Use Value: VOCM pin accepts 1.25 V reference to center differential output at 1.25 V, enabling full 0–2.5 V input mapping with 2.9 V p-p swing and <1 mV offset error. | Use Scenario: Driving differential inputs of high-resolution audio ADC in professional audio interface with ultra-low THD+N requirement. IC Role / Device Role / Timing Role: Low-noise (5 nV/√Hz), low-distortion differential buffer isolating sensitive analog stage from ADC input capacitance. Use Value: −114 dBc third harmonic at 5 MHz and 0.1 dB gain flatness to 40 MHz preserve harmonic integrity across full audio band. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar differential ADC driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| THS4561IDGKR | Lower power (40 mW vs. 90 mW), lower bandwidth (1.8 GHz vs. 320 MHz small-signal), higher input bias current (1.2 µA vs. 3.5 µA typ). | Better suited for battery-powered portable instrumentation; less optimal for high-fidelity, low-noise baseband gain blocks. | Select THS4561IDGKR when power budget is critical and >1 GHz small-signal bandwidth is needed; verify VOCM range compatibility (0.3 V to VDD − 0.3 V). |
| LMH5401RTVT | Higher bandwidth (4.5 GHz), higher distortion (−72 dBc HD2 @ 100 MHz), fixed 1.5 V VOCM reference (non-adjustable), requires external level-shifting for variable common-mode control. | Targeted at RF sampling ADCs (>1 GSPS); not recommended for precision dc-coupled or low-frequency applications. | Select LMH5401RTVT only for GHz-range RF sampling; avoid where dc accuracy, low THD, or flexible VOCM control are required. |
Compared with THS4561IDGKR and LMH5401RTVT, the AD8138AR-REEL7 provides superior harmonic distortion performance below 100 MHz, fully adjustable VOCM, and proven stability with standard 499 Ω gain-setting networks - making it the preferred choice for high-accuracy, medium-bandwidth data acquisition systems.
Availability
AD8138AR-REEL7 is available at Aetrix Electronics and suitable for high-speed data acquisition, communications IF signal chains, single-supply ADC interfaces, and baseband signal conditioning requiring stable component supply and long-term production continuity.
Supply support for AD8138AR-REEL7 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 AD8138 belongs to Analog Devices' precision high-speed amplifier product line, engineered specifically for demanding differential signal conditioning in data converter interfaces, communications infrastructure, and test & measurement equipment.
FAQ
What is the maximum differential output voltage swing for AD8138AR-REEL7 at ±5 V supply?
The AD8138AR-REEL7 delivers a maximum differential output voltage swing of 7.75 V p-p under ±5 V supply conditions, corresponding to 3.875 V p-p per single-ended output relative to common-mode level. This allows full utilization of high-voltage ADC input ranges while maintaining linearity and low distortion across the specified bandwidth.
Can AD8138AR-REEL7 operate from a single 3.3 V supply?
Yes, AD8138AR-REEL7 supports single-supply operation from 2.7 V to 11 V. At 3.3 V, it maintains 280 MHz −3 dB bandwidth (G = +1), 950 V/µs slew rate, and 2.9 V p-p single-ended output swing. VOCM must be biased within 1.0 V to 3.8 V, and input common-mode range adjusts accordingly (−0.3 V to +3.2 V).
How does the VOCM pin function in AD8138AR-REEL7, and what voltage range is supported?
The VOCM pin on AD8138AR-REEL7 directly sets the common-mode voltage of both +OUT and −OUT with near-unity gain (0.9955–1.0045 V/V). It accepts dc voltages from −VS to +VS, supporting −5.5 V to +5.5 V in dual-supply mode or 1.0 V to 3.8 V in 3.3 V single-supply operation - enabling seamless level-shifting for diverse ADC input requirements.
What is the typical input offset voltage specification for AD8138AR-REEL7, and how does it vary with temperature?
The AD8138AR-REEL7 has a typical input offset voltage of ±1 mV at 25°C, with a worst-case variation of ±4 µV/°C over −40°C to +85°C. This results in ≤ ±0.5 mV total drift across the full temperature range, ensuring stable dc accuracy in precision sensor signal chains and calibrated measurement systems.
Does AD8138AR-REEL7 require external compensation components for stability with capacitive loads?
AD8138AR-REEL7 is internally compensated for unity-gain stability but benefits from series resistance (e.g., 24.9 Ω) in series with capacitive loads >5 pF to maintain phase margin. The datasheet provides validated test circuits (Figure 40) showing stable operation up to 20 pF with 24.9 Ω isolation resistors - no additional external capacitors or feedback adjustments are needed for standard 50 Ω system interfaces.
AD8138AR-REEL7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- ADC Driver
- Applications:
- Data Acquisition
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- 8-SOIC
AD8138AR-REEL7 FAQ
1.How can I place an order for AD8138AR-REEL7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AD8138AR-REEL7 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 AD8138AR-REEL7 reliable?
The price and inventory of AD8138AR-REEL7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD8138AR-REEL7 is usually 5 days.
3.What payment methods are accepted for AD8138AR-REEL7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD8138AR-REEL7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD8138AR-REEL7?
AD8138AR-REEL7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD8138AR-REEL7 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 AD8138AR-REEL7?
For technical support, including AD8138AR-REEL7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD8138AR-REEL7 requirements.
6.How does Aetrix verify that AD8138AR-REEL7 is sourced from the original manufacturer or authorized distributors?
All AD8138AR-REEL7 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 AD8138AR-REEL7 meets industry standards.
7.What is the process for return or replacement of AD8138AR-REEL7?
All AD8138AR-REEL7 units undergo pre-shipment inspection (PSI). If there is an issue with AD8138AR-REEL7, 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 AD8138AR-REEL7 part is unused and in its original packaging.
Return procedure for AD8138AR-REEL7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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