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Analog Devices Inc. ADR444ARMZ-REEL7
- Part No.:
- ADR444ARMZ-REEL7
- Manufacturer:
- Analog Devices Inc.
- Category:
- Voltage Reference
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
ADR444ARMZ-REEL7.pdf
- Description:
- IC VREF SERIES 0.13% 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,291
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Product details
Overview
ADR444ARMZ-REEL7 from Analog Devices is an ultralow-noise, precision XFET® voltage reference IC delivering 4.096 V output with ±1.6 mV initial accuracy (B grade), 3 ppm/°C temperature coefficient, and 1.8 µV p-p (0.1 Hz to 10 Hz) noise. It operates from 4.6 V to 18 V input, supports ±10 mA/−5 mA sourcing/sinking, and targets high-resolution ADC biasing in portable medical instruments.
For engineers reviewing the ADR444ARMZ-REEL7 datasheet, ADR444ARMZ-REEL7 pinout, ADR444ARMZ-REEL7 application, or ADR444ARMZ-REEL7 equivalent, key selection criteria include low-frequency noise performance, trim-adjustable output, LDO headroom of 500 mV, and operation across −40°C to +125°C industrial temperature range.
Technical Context
The ADR444ARMZ-REEL7 implements XFET® technology-using two JFETs with differential pinch-off voltage and PTAT current correction-to achieve near-zero curvature temperature drift and intrinsic 0.5 V reference core. Its architecture eliminates buried Zener limitations while enabling low-noise operation at minimal supply headroom.
It integrates a dedicated TRIM terminal for ±0.5% output adjustment without degrading noise or drift, supports bidirectional load current (source up to +10 mA, sink up to −5 mA), and maintains stable regulation under line/load transients per Figures 25–27 in Rev. G datasheet.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 4.096 V nominal; B-grade devices guaranteed 4.0944 V to 4.0976 V at 25°C - enables direct interface with 12-bit SAR ADCs requiring precise 4.096 V full-scale reference. |
| Initial Accuracy | ±1.6 mV (0.04%) - reduces calibration burden in factory-trimmed instrumentation systems. |
| Temp Coefficient | 3 ppm/°C (B grade, −40°C to +125°C) - ensures ≤ ±0.5 mV total drift over full temperature range, critical for field-deployed sensors. |
| Voltage Noise | 1.8 µV p-p (0.1 Hz to 10 Hz) - directly limits effective resolution in 24-bit delta-sigma ADC front-ends. |
| Supply Headroom | 500 mV minimum (VIN ≥ VOUT + 0.5 V) - allows operation from single Li+ cell (4.2 V) with margin for aging and dropout. |
| Output Current | +10 mA source / −5 mA sink - drives ADC reference inputs, op-amp bias networks, and small DAC loads without external buffers. |
| Quiescent Current | 3.75 mA max - balances low-noise performance with power budget constraints in battery-powered designs. |
Pinout & Package
ADR444ARMZ-REEL7 is housed in an 8-lead MSOP (RM suffix) package with exposed pad. Pin 1 is DNC (Do Not Connect); pins 3 and 7 are NIC (Not Internally Connected); pin 4 is GND; pin 2 is VIN; pin 6 is VOUT; pin 5 is TRIM.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 8 | DNC | Must remain unconnected - internal floating node; soldering or routing causes parametric shift or failure. |
| 2 | VIN | Main power input; requires 0.1 µF bypass capacitor close to pin to suppress PSRR degradation above 1 kHz. |
| 3, 7 | NIC | No internal connection; electrically isolated - may be used as thermal relief or left floating on PCB. |
| 4 | GND | Analog ground reference; must tie to clean low-impedance ground plane to minimize noise coupling into VOUT. |
| 5 | TRIM | Adjustment node for ±0.5% output scaling via external resistor divider; high-impedance input - sensitive to leakage and EMI. |
| 6 | VOUT | Stable 4.096 V reference output; requires 0.1 µF ceramic capacitor directly at pin to ensure phase margin and transient stability. |
Key Features
| Feature | Design Value |
|---|---|
| XFET® Reference Core | Replaces traditional buried Zener with JFET-based topology - achieves 3 ppm/°C drift and 1.8 µV p-p noise without requiring high supply voltage or complex compensation. |
| Trim-Adjustable Output | TRIM pin enables ±0.5% fine-tuning of VOUT using external resistors - preserves initial accuracy and tempco while accommodating system-level gain calibration. |
| Bidirectional Output Drive | Source up to +10 mA and sink up to −5 mA - eliminates need for external buffer op-amps when driving switched-capacitor ADC inputs or active filters. |
| Low Dropout Operation | 500 mV headroom enables use with 4.6 V minimum input - supports direct regulation from buck-boost converters or aged lithium batteries. |
| Extended Temperature Range | Specified from −40°C to +125°C - qualified for under-hood automotive sensors and industrial process controllers without derating. |
Applications
| High-Resolution Data Acquisition | Precision Portable Medical Instruments |
|---|---|
Use Scenario: 24-bit delta-sigma ADC in laboratory-grade digital multimeter measuring sub-µV signals. IC Role / Device Role / Timing Role: Primary voltage reference establishing full-scale range and offset null point for analog front-end. Use Value: 1.8 µV p-p low-frequency noise directly enables >110 dB SNR without external filtering; 3 ppm/°C drift avoids recalibration during ambient temperature shifts. | Use Scenario: Battery-powered ECG monitor requiring stable baseline for microvolt-level cardiac waveform capture. IC Role / Device Role / Timing Role: Precision bias source for instrumentation amplifier and ADC reference rail in ultra-low-power analog signal chain. Use Value: 500 mV dropout allows operation down to 4.2 V battery voltage; ±5 mA sink capability supports active discharge of input protection networks during lead-off detection. |
| Optical Control Circuits | Industrial Process Control Systems |
Use Scenario: Laser diode current controller in fiber-optic transceiver where optical power stability depends on reference voltage accuracy. IC Role / Device Role / Timing Role: Setpoint reference for closed-loop current regulator driving laser diode via external MOSFET. Use Value: 0.04% initial accuracy and 50 ppm long-term stability ensure <±0.1% optical power drift over 1000 hours - meets GR-468 reliability requirements. | Use Scenario: 4–20 mA transmitter module in hazardous-area pressure sensor with HART communication overlay. IC Role / Device Role / Timing Role: Stable excitation reference for bridge sensor and precision DAC generating loop current setpoint. Use Value: −40°C to +125°C operation guarantees specification compliance in oil/gas wellhead environments; TRIM pin enables field calibration without hardware change. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADR4540BRZ-R7 | 4.096 V output, 0.8 ppm/°C max tempco, 1.75 µV p-p noise, but only +10 mA source (no sink capability) and 1.2 V min headroom. | Suitable for high-stability, low-drift systems where bidirectional drive is unnecessary and higher input voltage is available. | Select ADR4540BRZ-R7 when ultimate drift performance is prioritized over sink current and low-headroom operation. |
| REF5040AIDR | 4.096 V output, 3 ppm/°C max tempco, 2.3 µV p-p noise, +10 mA/−10 mA drive, but requires 1.2 V headroom and consumes 1.1 mA quiescent current. | Better sink capability suits active filter biasing; higher noise limits use in highest-resolution ADCs. | Select REF5040AIDR when symmetric ±10 mA drive is required and 1.2 V headroom is acceptable in the power architecture. |
Compared with ADR444ARMZ-REEL7, ADR4540BRZ-R7 offers lower drift but lacks sink current and demands higher headroom, while REF5040AIDR provides stronger sink drive at the cost of higher noise and reduced battery runtime efficiency.
Availability
ADR444ARMZ-REEL7 is available at Aetrix Electronics and suitable for precision data acquisition systems, portable medical instruments, and industrial process control systems requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for ADR444ARMZ-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 ADR44x family was designed specifically for ultralow-noise, high-accuracy voltage reference applications in precision data converters, optical networks, and portable instrumentation - leveraging XFET® technology to overcome limitations of traditional bandgap and buried Zener references.
FAQ
What is the guaranteed output voltage tolerance for ADR444ARMZ-REEL7 over temperature?
The ADR444ARMZ-REEL7 (B grade) guarantees output voltage between 4.0944 V and 4.0976 V at 25°C, with total variation ≤ ±0.5 mV across −40°C to +125°C due to its 3 ppm/°C temperature coefficient. This corresponds to ±0.5 mV absolute drift, confirmed in Table 5 and Figure 8 of Rev. G datasheet.
Can ADR444ARMZ-REEL7 sink current, and how much?
Yes, ADR444ARMZ-REEL7 can sink up to −5 mA continuously, as specified in Table 5 under "OUTPUT CURRENT CAPACITY". This capability supports active discharge of capacitive loads, biasing of current-sinking DACs, and lead-off detection circuits in medical instrumentation without external components.
What is the minimum input voltage required for ADR444ARMZ-REEL7 to regulate properly?
The minimum input voltage for ADR444ARMZ-REEL7 is 4.6 V, defined by its 500 mV dropout requirement above the 4.096 V nominal output. This is explicitly stated in Table 5 under "SUPPLY VOLTAGE OPERATING RANGE" and validated in Figure 20 showing headroom vs. load current.
How does the TRIM pin on ADR444ARMZ-REEL7 function, and what is its adjustment range?
The TRIM pin on ADR444ARMZ-REEL7 allows ±0.5% output voltage scaling using an external resistor divider, as detailed in the "Output Adjustment" section (Page 16). The adjustment preserves initial accuracy and temperature coefficient, and the pin presents high impedance - requiring guarded routing to avoid leakage-induced errors.
Is ADR444ARMZ-REEL7 suitable for battery-powered applications with Li-ion cells?
Yes, ADR444ARMZ-REEL7 is optimized for battery-powered use: its 4.6 V minimum input supports operation down to ~3.8 V after battery aging, 3.75 mA quiescent current minimizes drain, and −40°C to +125°C rating covers cold-weather deployment. These traits are validated in Figures 10–13 and Table 5 of the Rev. G datasheet.
ADR444ARMZ-REEL7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Series:
- XFET®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Reference Type:
- Series
- Output Type:
- Fixed
- Voltage - Output (Min/Fixed):
- 4.096V
- Voltage - Output (Max):
- -
- Current - Output:
- 10 mA
- Tolerance:
- ±0.13%
- Temperature Coefficient:
- 10ppm/°C
- Noise - 0.1Hz to 10Hz:
- 1.8µVp-p
- Noise - 10Hz to 10kHz:
- -
- Voltage - Input:
- 4.6V ~ 18V
- Current - Supply:
- 3.75mA
- Current - Cathode:
- -
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-MSOP
ADR444ARMZ-REEL7 FAQ
1.How can I place an order for ADR444ARMZ-REEL7 through Aetrix?
Please submit a Request for Quotation (RFQ) for ADR444ARMZ-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 ADR444ARMZ-REEL7 reliable?
The price and inventory of ADR444ARMZ-REEL7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADR444ARMZ-REEL7 is usually 5 days.
3.What payment methods are accepted for ADR444ARMZ-REEL7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADR444ARMZ-REEL7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADR444ARMZ-REEL7?
ADR444ARMZ-REEL7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADR444ARMZ-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 ADR444ARMZ-REEL7?
For technical support, including ADR444ARMZ-REEL7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADR444ARMZ-REEL7 requirements.
6.How does Aetrix verify that ADR444ARMZ-REEL7 is sourced from the original manufacturer or authorized distributors?
All ADR444ARMZ-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 ADR444ARMZ-REEL7 meets industry standards.
7.What is the process for return or replacement of ADR444ARMZ-REEL7?
All ADR444ARMZ-REEL7 units undergo pre-shipment inspection (PSI). If there is an issue with ADR444ARMZ-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 ADR444ARMZ-REEL7 part is unused and in its original packaging.
Return procedure for ADR444ARMZ-REEL7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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