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Analog Devices Inc. ADA4941-1YRZ-RL
- Part No.:
- ADA4941-1YRZ-RL
- Manufacturer:
- Analog Devices Inc.
- Category:
- Special Purpose Amplifiers
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
ADA4941-1YRZ-RL.pdf
- Description:
- IC ADC DRIVER 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,466
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Product details
Overview
ADA4941-1YRZ-RL from Analog Devices is a single-supply, low-power, differential ADC driver optimized for 18-bit analog-to-digital converters. It functions as a precision single-ended-to-differential converter with gain = 2 (typical), 31 MHz −3 dB bandwidth (G = 2, VS = 5 V), 10.2 nV/√Hz output-referred voltage noise, and rail-to-rail output swing - enabling high-SNR signal conditioning in battery-powered data acquisition systems.
For engineers reviewing the ADA4941-1YRZ-RL datasheet, ADA4941-1YRZ-RL pinout, ADA4941-1YRZ-RL application, or ADA4941-1YRZ-RL equivalent, key selection criteria include its 2.2 mA quiescent current at 3 V, 0.8 mV max output-referred offset (G = 2), disable feature with 30 µs turn-off time, and compatibility with PulSAR® ADCs including AD7687, AD7690, and AD7691.
Technical Context
The ADA4941-1YRZ-RL implements a two-amplifier architecture: an uncommitted op amp (A1) driving a precision inverter (A2), with FB pin enabling user-adjustable closed-loop gain via external resistors. Its REF pin sets output common-mode voltage independently of differential output, supporting flexible interface to ADC reference domains.
Designed on Analog Devices' second-generation XFCB process, it achieves 18-bit performance with low distortion (−110 dBc HD3 at 100 kHz, VO,dm = 2 V p-p) and fast settling (300 ns to 0.005% for 2 V step), while maintaining stable operation across −40°C to +125°C with 24 MΩ input impedance and 1.4 pF input capacitance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| −3 dB Bandwidth | 31 MHz at G = 2, VS = 5 V - supports high-speed sampling of wideband sensor signals into 18-bit ADCs. |
| Output-Referred Voltage Noise | 10.2 nV/√Hz at 100 kHz - preserves SNR when driving high-resolution ADCs with full-scale inputs ≥2 V p-p. |
| Quiescent Current | 2.2 mA at 3 V supply - enables >100-hour operation on coin-cell batteries in portable instrumentation. |
| Differential Output Offset | 0.8 mV max (G = 2) - contributes ≤0.01 LSB error when driving 18-bit ADCs with 2.5 V reference. |
| Input Impedance | 24 MΩ - minimizes loading on high-impedance sensors (e.g., piezoelectric, pH electrodes) without external buffering. |
| Settling Time | 300 ns to 0.005% for 2 V step - meets timing budget for 1 MSPS+ SAR ADCs like AD7690. |
| Rail-to-Rail Output | ±2.95 V swing (G = 4, VS = 5 V) - maximizes dynamic range utilization of differential-input ADCs. |
Pinout & Package
The ADA4941-1YRZ-RL is packaged in an 8-lead 3 mm × 3 mm LFCSP with exposed paddle (EPAD), rated for −40°C to +125°C operation. The EPAD is thermally conductive but electrically isolated; it must be soldered to a PCB ground or power plane for thermal management.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (FB) | Feedback Input | Connects to OUT+ to set gain = 2; adding external RF/RG network enables gains >2 or negative gain configurations. |
| 2 (REF) | Reference Input | Sets output common-mode voltage (e.g., 2.5 V for AD7690); independent of differential output magnitude. |
| 3 (V+) | Positive Supply | Accepts 2.7 V to 12 V single supply or ±5 V dual supply; PSRR >86 dB ensures immunity to supply ripple. |
| 4 (OUT+) | Noninverting Output | Delivers amplified, phase-aligned signal; paired with OUT− forms fully differential output to ADC inputs. |
| 5 (OUT−) | Inverting Output | Provides precise 180° phase-inverted complement; matched propagation delay ensures <1 ps skew vs. OUT+. |
| 6 (V−) | Negative Supply | Required for dual-supply operation; tied to ground in single-supply mode (VS = V+, GND = V−). |
| 7 (DIS) | Disable Control | Active-high logic input; reduces supply current to 12–20 µA and isolates outputs when asserted. |
| 8 (IN) | Single-Ended Input | High-impedance node (24 MΩ) accepts sensor or DAC outputs; common-mode range extends to 0.2 V above V−. |
Key Features
| Feature | Design Value |
|---|---|
| Single-ended-to-differential conversion | Eliminates need for transformer or discrete amplifier pair, reducing BOM count and layout area in space-constrained DAQ modules. |
| User-adjustable gain | Supports G = +2 (default), +4, +10, or −2 via external resistors - adapts to varying ADC input ranges without redesigning front-end. |
| Rail-to-rail output | Delivers >98% of supply rail-to-rail swing (e.g., ±4.93 V on ±5 V), maximizing effective resolution of 18-bit ADCs. |
| Low power disable mode | Reduces ICC to ≤20 µA and provides >100 dB input-to-output isolation - essential for duty-cycled sensor nodes. |
| High input impedance | 24 MΩ || 1.4 pF input presents negligible loading to high-Z sources (e.g., thermocouples, strain gauges), preserving signal integrity. |
Applications
| Battery-Powered Data Acquisition | Medical Instrumentation |
|---|---|
Use Scenario: Portable ECG monitor acquiring microvolt-level cardiac signals with 18-bit resolution and >24-hour battery life. IC Role / Device Role / Timing Role: Single-ended electrode signal conditioning stage driving AD7691 ADC; provides gain = 2, CM rejection, and low-noise differential output. Use Value: 10.2 nV/√Hz noise and 2.2 mA quiescent current enable sub-µV signal fidelity while extending battery runtime beyond 30 hours on two AA cells. | Use Scenario: Handheld blood glucose meter requiring precise analog front-end for electrochemical sensor readout. IC Role / Device Role / Timing Role: Low-drift, rail-to-rail driver interfacing amperometric sensor to AD7687 SAR ADC in single 3.3 V supply system. Use Value: 0.8 mV max output offset and 0.3 µV/°C input offset drift ensure <0.1% measurement error across 0–50°C operating range. |
| Process Control Transmitter | Industrial Sensor Interface |
Use Scenario: 4–20 mA loop-powered temperature transmitter with HART modulation capability. IC Role / Device Role / Timing Role: Differential driver for RTD bridge output feeding AD7690 ADC; REF pin tied to internal 2.5 V reference for common-mode alignment. Use Value: 24 MΩ input impedance prevents bridge imbalance errors; disable feature allows HART signal injection without ADC interference. | Use Scenario: Vibration monitoring node using MEMS accelerometer with analog output, deployed in harsh industrial environments. IC Role / Device Role / Timing Role: Robust front-end amplifier driving AD7691 in extended temperature range (−40°C to +125°C) with EMC-hardened layout. Use Value: Specified operation to +125°C and 83°C/W θJA (LFCSP) ensure reliability in enclosed enclosures; 300 ns settling supports 1 MSPS sampling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ADC driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADA4940-1YRZ-R7 | Lower power (1.2 mA @ 3 V), narrower bandwidth (22 MHz), no disable pin | Optimized for ultra-low-power, lower-speed (<500 kSPS) systems where disable functionality is unnecessary | Select when battery life is paramount and 31 MHz bandwidth is excessive; verify REF pin behavior matches system common-mode requirements. |
| THS4561IRGET | Higher bandwidth (1.8 GHz), higher noise (1.6 nV/√Hz), 12.5 mA ICC @ 5 V | Targeted at high-speed (>10 MSPS), lower-resolution (12–14 bit) applications requiring minimal group delay | Choose only when driving high-speed pipeline or sigma-delta ADCs; avoid for 18-bit SAR due to excess noise and power consumption. |
Compared with ADA4940-1YRZ-R7, the ADA4941-1YRZ-RL delivers 9 MHz more bandwidth and integrated disable control at +83% quiescent current; versus THS4561IRGET, it trades 1.77 GHz bandwidth for 83% lower power and 6.4× lower noise - making it optimal for precision, battery-sensitive 18-bit data acquisition.
Availability
ADA4941-1YRZ-RL is available at Aetrix Electronics and suitable for battery-powered data acquisition systems, medical instrumentation, process control transmitters, and industrial sensor interfaces requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for ADA4941-1YRZ-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 ADA4941-1YRZ-RL belongs to Analog Devices' precision ADC driver product line, engineered specifically to maximize dynamic range and SNR when interfacing high-resolution SAR ADCs in low-power, single-supply systems.
FAQ
What is the maximum supply voltage rating for the ADA4941-1YRZ-RL?
The ADA4941-1YRZ-RL has an absolute maximum supply voltage rating of 12 V across V+ to V−. Operation beyond this limit risks permanent damage. For reliable long-term use, Analog Devices specifies the recommended operating range as 2.7 V to 12 V, with tested performance validated at 3 V, 5 V, and ±5 V supplies per the Rev. D datasheet.
Does the ADA4941-1YRZ-RL support true differential input configurations?
No, the ADA4941-1YRZ-RL is a single-ended-to-differential converter: it accepts one single-ended input (IN) referenced to the REF pin and produces complementary differential outputs (OUT+, OUT−). It does not accept a differential input signal. For differential-input drivers, consider the ADA4945-1 or ADA4950-1 families instead.
How does the REF pin function in the ADA4941-1YRZ-RL circuit?
The REF pin sets the output common-mode voltage (VO,cm) of both OUT+ and OUT− outputs. It does not affect the differential output voltage (VO,dm), which depends solely on IN, REF, and gain-setting resistors. For example, with REF = 2.5 V and VO,dm = 2 V p-p, outputs settle at +3.5 V and +1.5 V - maintaining 2.5 V common-mode while delivering 2 V differential swing.
Can the ADA4941-1YRZ-RL drive the AD7687 ADC directly?
Yes, the ADA4941-1YRZ-RL is explicitly recommended by Analog Devices to drive the AD7687. Its 300 ns settling time to 0.005%, rail-to-rail output swing, and low distortion (−110 dBc HD3 at 100 kHz) meet the AD7687's 16-bit performance requirements. Application note AN-1177 confirms direct interface with gain = 2 and REF = VREF/2 for optimal common-mode alignment.
What is the thermal resistance (θJA) of the ADA4941-1YRZ-RL package?
The ADA4941-1YRZ-RL in its 8-lead LFCSP package has a specified θJA of 83°C/W when mounted on a JEDEC-standard 4-layer board with the exposed paddle soldered to a thermally conductive copper plane. This value assumes zero airflow; actual θJA improves with PCB copper area and forced air cooling.
ADA4941-1YRZ-RL 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:
- Active
- Type:
- ADC Driver
- Applications:
- Data Acquisition
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- 8-SOIC
ADA4941-1YRZ-RL FAQ
1.How can I place an order for ADA4941-1YRZ-RL through Aetrix?
Please submit a Request for Quotation (RFQ) for ADA4941-1YRZ-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 ADA4941-1YRZ-RL reliable?
The price and inventory of ADA4941-1YRZ-RL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADA4941-1YRZ-RL is usually 5 days.
3.What payment methods are accepted for ADA4941-1YRZ-RL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADA4941-1YRZ-RL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADA4941-1YRZ-RL?
ADA4941-1YRZ-RL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADA4941-1YRZ-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 ADA4941-1YRZ-RL?
For technical support, including ADA4941-1YRZ-RL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADA4941-1YRZ-RL requirements.
6.How does Aetrix verify that ADA4941-1YRZ-RL is sourced from the original manufacturer or authorized distributors?
All ADA4941-1YRZ-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 ADA4941-1YRZ-RL meets industry standards.
7.What is the process for return or replacement of ADA4941-1YRZ-RL?
All ADA4941-1YRZ-RL units undergo pre-shipment inspection (PSI). If there is an issue with ADA4941-1YRZ-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 ADA4941-1YRZ-RL part is unused and in its original packaging.
Return procedure for ADA4941-1YRZ-RL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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