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Analog Devices Inc. ADR444ARMZ
- Part No.:
- ADR444ARMZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Voltage Reference
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
ADR444ARMZ.pdf
- Description:
- IC VREF SERIES 0.13% 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:744
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Product details
Overview
ADR444ARMZ from Analog Devices is an ultralow-noise, low-dropout XFET® voltage reference delivering 4.096 V output with ±1.6 mV initial accuracy (B grade), 3 ppm/°C temperature coefficient, 1.8 µV p-p (0.1 Hz to 10 Hz) noise, and ±10 mA/−5 mA source/sink capability - used as a precision excitation or calibration reference in 24-bit SAR ADC front-ends.
For engineers reviewing the ADR444ARMZ datasheet, ADR444ARMZ pinout, ADR444ARMZ application, or ADR444ARMZ equivalent, key selection criteria include its 500 mV dropout headroom, trim-adjustable output, −40°C to +125°C operation, and SOIC_N/MSOP package compatibility with high-resolution data acquisition systems requiring stable DC biasing.
Technical Context
The ADR444ARMZ implements XFET® technology-using two matched JFETs with differential pinch-off voltage amplification-to generate a ~0.5 V intrinsic reference compensated by a PTAT current source, achieving lower noise and reduced thermal hysteresis versus bandgap references. Its curvature-corrected architecture minimizes voltage drift nonlinearity across temperature.
It operates as a two-terminal active reference with external trim adjustment (±0.5% range), supports bidirectional load current, and maintains regulation with input as low as VIN = VOUT + 500 mV (i.e., 4.596 V min for ADR444ARMZ), enabling use in battery-supplied precision analog signal chains.
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/16-bit DACs and 4.096 V full-scale ADCs without scaling. |
| Initial Accuracy | ±1.6 mV (0.04%) for B grade - reduces system calibration burden in portable medical instruments and field-deployed sensors. |
| Temp Coefficient | 3 ppm/°C max (−40°C to +125°C) - ensures ≤ ±0.5 mV drift over full industrial range, critical for optical control circuits. |
| Voltage Noise | 1.8 µV p-p (0.1 Hz–10 Hz); 78.6 nV/√Hz @ 1 kHz - preserves SNR in 1 MSPS+ precision data converters. |
| Dropout Voltage | 500 mV - allows operation from single Li-ion (3.0–4.2 V) with boost or from 5 V rails with minimal headroom loss. |
| Source/Sink Current | +10 mA / −5 mA - 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 instrumentation. |
Pinout & Package
ADR444ARMZ is packaged in an 8-lead MSOP (RM suffix), 3 mm × 3 mm, 0.65 mm pitch, with exposed pad for thermal enhancement. 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) | Do Not Connect | Must remain floating; no trace or solder connection - avoids parasitic coupling or latch-up risk. |
| 2 (VIN) | Input Supply | Accepts 4.6 V to 18 V; requires ≥0.1 µF ceramic bypass capacitor close to pin for stability and ripple rejection. |
| 3, 7 (NIC) | Not Internally Connected | No internal bond wire; electrically isolated - may be left unconnected or tied to GND for mechanical rigidity only. |
| 4 (GND) | Analog Ground Reference | Primary return path for reference current; must connect to clean analog ground plane with low-inductance path. |
| 5 (TRIM) | Output Voltage Adjustment | Connects to external 10 kΩ potentiometer between VOUT and GND to fine-tune output ±0.5% without degrading noise or drift. |
| 6 (VOUT) | Precision Output | Delivers regulated 4.096 V; requires ≥0.1 µF ceramic output capacitor; sensitive to PCB layout-induced noise pickup. |
Key Features
| Feature | Design Value |
|---|---|
| XFET® Reference Core | Uses implanted JFET pair with PTAT compensation - achieves 3× lower noise and 5× better temp hysteresis vs. comparable buried Zener references. |
| Trim-Adjustable Output | ±0.5% output tuning via external resistor network - enables system-level calibration without replacing the reference IC. |
| Bidirectional Load Drive | Sinks −5 mA while sourcing +10 mA - supports active filtering, bipolar DAC interfaces, and programmable current sources. |
| Low Dropout Operation | 500 mV headroom at full load - permits use with low-voltage rails (e.g., 5 V LDO outputs) in space-constrained industrial modules. |
| Extended Temperature Range | Specified from −40°C to +125°C - qualified for under-hood automotive sensors and downhole oilfield electronics. |
Applications
| High-Resolution Data Acquisition | Battery-Powered Medical Instruments |
|---|---|
Use Scenario: 24-bit sigma-delta ADC measuring microvolt-level bio-potentials in portable ECG monitors. IC Role / Device Role / Timing Role: Primary voltage reference for ADC's internal PGA and external sensor excitation circuitry. Use Value: 1.8 µV p-p noise and 3 ppm/°C drift ensure <0.001% gain error over temperature, preserving diagnostic accuracy without recalibration. | Use Scenario: Handheld blood glucose meter using electrochemical test strips with analog front-end conditioning. IC Role / Device Role / Timing Role: Stable excitation reference for transimpedance amplifier and ADC reference input. Use Value: 500 mV dropout enables operation from single 3.6 V Li-ion cell; ±1.6 mV initial accuracy eliminates factory trim steps during volume production. |
| Industrial Process Control Sensors | Optical Network Monitoring Circuits |
Use Scenario: 4–20 mA loop-powered pressure transmitter with HART digital overlay. IC Role / Device Role / Timing Role: Precision reference for DAC generating loop current and for ADC reading sensor bridge output. Use Value: −40°C to +125°C rating and 50 ppm long-term stability ensure 10+ year field reliability in refinery environments. | Use Scenario: Optical power monitor in DWDM transceiver module measuring photodiode current with 0.1 dB resolution. IC Role / Device Role / Timing Role: Low-noise bias reference for transimpedance amplifier and ADC reference. Use Value: 78.6 nV/√Hz broadband noise prevents degradation of dynamic range when digitizing fast photodiode pulses. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADR4540ARMZ | 4.096 V, 0.8 ppm/°C max, 1.2 µV p-p noise, but 1.5 V min dropout and 12 mA quiescent current. | Higher accuracy and lower noise, but higher power and less suitable for battery operation. | Select ADR4540ARMZ only when sub-ppm drift and ultra-low noise outweigh power and dropout constraints. |
| REF5040AIDR | 4.096 V, 3 ppm/°C, 1.6 µV p-p noise, 350 mV dropout, but no sink capability and no trim pin. | Lacks bidirectional drive and adjustability - requires external buffer for sinking loads or trimming. | Choose REF5040AIDR when sink current and trim are unnecessary and lowest possible dropout is prioritized. |
Compared with ADR444ARMZ, ADR4540ARMZ offers superior drift and noise at the cost of higher power and dropout, while REF5040AIDR provides equal drift and slightly lower noise with tighter dropout but sacrifices sink capability and trim flexibility - making ADR444ARMZ optimal for balanced performance in mixed-signal industrial designs.
Availability
ADR444ARMZ 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 product lifecycles.
Supply support for ADR444ARMZ 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-stability voltage referencing in precision measurement systems - emphasizing XFET® technology to overcome limitations of traditional bandgap and buried Zener architectures.
FAQ
What is the minimum input voltage required for stable operation of the ADR444ARMZ?
The ADR444ARMZ requires a minimum input voltage of 4.6 V, defined as VOUT + 500 mV (4.096 V + 0.5 V). This 500 mV dropout headroom is guaranteed across temperature and load conditions up to +125°C and ±10 mA. Operating below 4.6 V risks loss of regulation and increased noise or drift. The ADR444ARMZ datasheet specifies this as an absolute minimum under all conditions.
Can the ADR444ARMZ sink current, and how much is supported?
Yes, the ADR444ARMZ can sink up to −5 mA of output current, as confirmed in Table 5 of the Rev. G datasheet. This bidirectional capability allows it to drive capacitive loads, interface with op-amps in inverting configurations, or serve as a precision current sink in programmable bias networks - unlike many references limited to sourcing only.
What does the TRIM pin on the ADR444ARMZ do, and how is it used?
The TRIM pin (Pin 5) on the ADR444ARMZ enables ±0.5% output voltage adjustment using an external 10 kΩ potentiometer connected between VOUT and GND. This allows system-level calibration without altering the reference's noise, drift, or long-term stability - a feature documented in the Applications Information section of the ADR444ARMZ datasheet.
Is the ADR444ARMZ suitable for operation at +125°C ambient temperature?
Yes, the ADR444ARMZ is fully specified and tested over −40°C to +125°C ambient temperature, including all key parameters: output voltage, temperature coefficient, noise, and load regulation. Its thermal resistance (θJA = 132.5°C/W for MSOP) and junction temperature limit (+150°C) support reliable operation at maximum ambient when power dissipation remains within limits.
How does the noise performance of the ADR444ARMZ compare to the ADR441ARMZ?
The ADR444ARMZ has 1.8 µV p-p (0.1 Hz–10 Hz) voltage noise, while the ADR441ARMZ is rated at 1.2 µV p-p under identical conditions. This difference arises from inherent scaling effects in the XFET core at higher output voltages; both meet their respective specifications and remain among the lowest-noise references in their class for precision data converter applications.
ADR444ARMZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Series:
- XFET®
- Packaging:
- Tube
- 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 FAQ
1.How can I place an order for ADR444ARMZ through Aetrix?
Please submit a Request for Quotation (RFQ) for ADR444ARMZ 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 reliable?
The price and inventory of ADR444ARMZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADR444ARMZ is usually 5 days.
3.What payment methods are accepted for ADR444ARMZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADR444ARMZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADR444ARMZ?
ADR444ARMZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADR444ARMZ 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?
For technical support, including ADR444ARMZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADR444ARMZ requirements.
6.How does Aetrix verify that ADR444ARMZ is sourced from the original manufacturer or authorized distributors?
All ADR444ARMZ 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 meets industry standards.
7.What is the process for return or replacement of ADR444ARMZ?
All ADR444ARMZ units undergo pre-shipment inspection (PSI). If there is an issue with ADR444ARMZ, 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 part is unused and in its original packaging.
Return procedure for ADR444ARMZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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