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Analog Devices Inc. REF192FS
- Part No.:
- REF192FS
- Manufacturer:
- Analog Devices Inc.
- Category:
- Voltage Reference
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
REF192FS.pdf
- Description:
- IC VREF SERIES 0.2% 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,031
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Product details
Overview
REF192FS from Analog Devices is a precision micropower low-dropout voltage reference IC delivering 2.50 V output with ±2 mV initial accuracy, 5 ppm/°C max temperature coefficient, and 45 μA max supply current - used as a stable excitation source for high-resolution ADCs in portable instrumentation and solar-powered sensor nodes.
For engineers reviewing the REF192FS datasheet, REF192FS pinout, REF192FS application, or REF192FS equivalent, key selection criteria include dropout voltage (1.00 V at 10 mA), sleep-mode current (15 μA), load regulation (4 ppm/mA), and SOIC-8 packaging compatibility with Kelvin-sensing layouts in precision analog signal chains.
Technical Context
The REF192FS employs a patented curvature-corrected band gap core with laser-trimmed thin-film resistors to achieve low drift across −40°C to +85°C. Its SLEEP pin enables TTL/CMOS-compatible shutdown, reducing quiescent current to ≤15 μA while disabling output.
It operates with input-to-output headroom as low as 100 mV above nominal output (2.50 V), supporting supply voltages down to 2.60 V at 10 mA load. Output short-circuit protection and 1 μF mandatory output bypass capacitor ensure robustness in embedded measurement systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Output Voltage | 2.50 V - precisely trimmed reference for 12–16-bit ADC/DAC biasing and calibration. |
| Initial Accuracy | ±2 mV maximum at 25°C - enables single-point calibration in factory-trimmed sensor transmitters. |
| Temp Coefficient | 5 ppm/°C max (−40°C to +85°C) - contributes ≤125 μV drift over industrial range, critical for unheated field instruments. |
| Dropout Voltage | 1.00 V at 10 mA load - allows operation from 3.5 V supplies, compatible with Li-ion or dual-cell alkaline sources. |
| Supply Current | 45 μA max (active), 15 μA max (sleep) - supports multi-year battery life in wireless sensor endpoints. |
| Load Regulation | 4 ppm/mA - ensures <±10 μV shift per mA load change, essential for ratiometric bridge sensor interfaces. |
| Noise (0.1–10 Hz) | 25 μV p-p - low enough to avoid degrading ENOB in 16-bit SAR ADCs sampling at ≤10 kSPS. |
Pinout & Package
REF192FS is housed in an 8-lead SOIC_N (SOIC-8) package (S suffix), with exposed pad not electrically connected. Pin 1 and Pin 5 are factory test points (TP) for Zener-zap trimming and must remain unconnected in circuit.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (TP) | Factory Test Point | Reserved for internal Zener trim; no user connection - floating node avoids parasitic leakage paths. |
| 2 (VS) | Positive Supply Input | Accepts 2.6 V to 15 V; dropout headroom as low as 100 mV above 2.50 V output enables ultra-low-voltage operation. |
| 3 (SLEEP) | Digital Enable/Disable Control | TTL/CMOS-compatible input; low state disables output and reduces supply current to ≤15 μA. |
| 4 (GND) | Analog Ground Reference | Return path for output and internal bias; requires star grounding near output capacitor to minimize noise coupling. |
| 5 (TP) | Factory Test Point | Reserved for internal Zener trim; must be left unconnected to prevent accuracy degradation or instability. |
| 6 (NC) | No Connect | Internally unused; must remain unconnected to avoid unintended parasitic paths or ESD stress. |
| 7 (NC) | No Connect | Internally unused; PCB layout must isolate from traces and planes to maintain specified long-term stability. |
| 8 (OUTPUT) | Precision Voltage Output | 2.50 V regulated output; requires 1 μF ceramic capacitor to GND for stability and noise suppression. |
Key Features
| Feature | Design Value |
|---|---|
| Curvature-Corrected Band Gap Core | Enables 5 ppm/°C tempco over −40°C to +85°C without external compensation components. |
| Laser-Trimmed Thin-Film Resistors | Guarantees ±2 mV initial accuracy without post-assembly calibration in production test flow. |
| Low-Dropout Operation (100 mV headroom) | Supports direct use from single Li-ion (3.0–4.2 V) or two alkaline cells (2.4–3.2 V) without LDO pre-regulation. |
| Sleep Mode with TTL/CMOS Interface | Reduces system standby power by >66% (45 → 15 μA), enabling duty-cycled sensor acquisition in energy-harvesting designs. |
| Short-Circuit Protected Output | Withstands indefinite output-to-ground faults without latch-up or parametric shift, improving field reliability. |
| 1 μF Output Bypass Requirement | Ensures phase margin >60° and suppresses 25 μV p-p low-frequency noise - eliminates need for additional filtering stages. |
Applications
| Portable Instrumentation | High-Resolution Data Acquisition |
|---|---|
|
Use Scenario: Handheld multimeter with 16-bit sigma-delta ADC and auto-ranging front-end. IC Role / Device Role / Timing Role: Primary voltage reference for ADC conversion and internal DAC-based offset correction. Use Value: ±2 mV initial accuracy and 5 ppm/°C tempco enable 0.01% basic accuracy without temperature compensation firmware. |
Use Scenario: Industrial process transmitter with 4–20 mA loop-powered RTD interface. IC Role / Device Role / Timing Role: Excitation reference for constant-current RTD bias and ratiometric ADC reference. Use Value: 4 ppm/mA load regulation ensures <±10 μV error under full-scale sensor current swing, preserving 0.1°C RTD resolution. |
| Solar-Powered Environmental Sensors | Loop-Powered Smart Transmitters |
|
Use Scenario: Wireless soil moisture node powered by 2.5 V solar cell + supercapacitor buffer. IC Role / Device Role / Timing Role: Low-power reference for ADC measuring capacitive humidity sensor and thermistor. Use Value: 15 μA sleep current extends supercapacitor hold-up time to >72 hours between solar charging cycles. |
Use Scenario: HART-enabled pressure transmitter drawing power exclusively from 4–20 mA loop. IC Role / Device Role / Timing Role: Precision reference for microcontroller ADC, DAC, and HART modem signal generation. Use Value: 1.00 V dropout at 10 mA allows operation down to 3.5 V loop voltage, maximizing usable dynamic range before loop dropout. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADR3425ARJZ-R7 | 2.5 V, ±1.5 mV initial accuracy, 3 ppm/°C tempco, 3.5 μA typical supply current, SOT-23-5 package. | Lower power but lower output drive (15 mA); no sleep mode; unsuitable for >20 mA sensor excitation loads. | Select ADR3425 when ultra-low quiescent current dominates over load drive and shutdown control. |
| MAX6126AASA25+ | 2.5 V, ±0.5 mV initial accuracy, 3 ppm/°C tempco, 1.2 mA supply current, SO-8 package, no sleep pin. | Higher accuracy and lower noise (12 μV p-p), but 26× higher supply current limits battery life in intermittent-use sensors. | Select MAX6126 when absolute initial accuracy and low noise outweigh power budget constraints. |
Compared with REF192FS, ADR3425 offers superior power efficiency but sacrifices output current and active shutdown control, while MAX6126 delivers higher accuracy and lower noise at the cost of significantly increased quiescent consumption - making REF192FS optimal for balanced performance in loop-powered and solar-harvested systems requiring 30 mA drive and programmable sleep.
Availability
REF192FS is available at Aetrix Electronics and suitable for portable instrumentation, high-resolution data acquisition, and loop-current-powered instruments requiring stable component supply with guaranteed long-term parametric consistency.
Supply support for REF192FS 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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving precision measurement, industrial automation, and communications markets since 1965.
The REF19x series was designed specifically for micropower, low-dropout precision reference needs in battery-operated and energy-constrained systems - emphasizing accuracy retention across temperature, minimal headroom, and integrated sleep control.
FAQ
What is the minimum supply voltage required for stable operation of the REF192FS?
The REF192FS requires a minimum supply voltage of 2.60 V for stable 2.50 V output at 10 mA load, based on its 1.00 V dropout specification. At lighter loads, headroom can shrink to 100 mV (2.60 V min), but design margins should account for line regulation and temperature drift - always verify with worst-case 2.65 V supply in production validation.
Does the REF192FS require an output capacitor, and if so, what value and type?
Yes, the REF192FS mandates a 1 μF ceramic capacitor between OUTPUT and GND for stability and noise reduction, as specified in the Applications Information section. X7R or C0G dielectrics are recommended; tantalum or electrolytic capacitors are not acceptable due to ESR and aging effects that degrade long-term accuracy and transient response.
How does the SLEEP pin function on the REF192FS, and what logic levels activate it?
The SLEEP pin on the REF192FS is an active-low TTL/CMOS-compatible control: a logic low (≤0.8 V) disables the output and reduces supply current to ≤15 μA, while a logic high (≥2.4 V) enables normal operation. Input current remains ≤|8| μA in both states, allowing direct interfacing with microcontroller GPIO without level-shifting or buffering.
Can the REF192FS drive a 30 mA load continuously, and what is the impact on dropout voltage?
Yes, the REF192FS is rated for continuous 30 mA output current. At this load, dropout voltage rises to 1.40 V (per Table 5), requiring a minimum supply of 3.90 V. Derating is advised for thermal safety: sustained 30 mA operation at ambient >70°C may exceed junction temperature limits unless PCB copper area provides adequate heatsinking.
What is the purpose of Pins 1 and 5 on the REF192FS, and how should they be handled in PCB layout?
Pins 1 and 5 on the REF192FS are factory test points (TP) used for Zener-zap trimming during production and must remain unconnected in all applications. PCB layout must isolate these pins from traces, pours, and vias - floating connections prevent leakage currents that could shift output voltage or degrade long-term stability beyond the 1.2 mV/1000h spec.
REF192FS Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Series:
- REF19
- Packaging:
- Tube
- Product Status:
- Obsolete
- Reference Type:
- Series
- Output Type:
- Fixed
- Voltage - Output (Min/Fixed):
- 2.5V
- Voltage - Output (Max):
- -
- Current - Output:
- 30 mA
- Tolerance:
- ±0.2%
- Temperature Coefficient:
- 10ppm/°C
- Noise - 0.1Hz to 10Hz:
- 25µVp-p
- Noise - 10Hz to 10kHz:
- -
- Voltage - Input:
- 3V ~ 15V
- Current - Supply:
- 45µA
- Current - Cathode:
- -
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
REF192FS FAQ
1.How can I place an order for REF192FS through Aetrix?
Please submit a Request for Quotation (RFQ) for REF192FS 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 REF192FS reliable?
The price and inventory of REF192FS are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for REF192FS is usually 5 days.
3.What payment methods are accepted for REF192FS?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for REF192FS transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for REF192FS?
REF192FS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your REF192FS 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 REF192FS?
For technical support, including REF192FS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your REF192FS requirements.
6.How does Aetrix verify that REF192FS is sourced from the original manufacturer or authorized distributors?
All REF192FS 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 REF192FS meets industry standards.
7.What is the process for return or replacement of REF192FS?
All REF192FS units undergo pre-shipment inspection (PSI). If there is an issue with REF192FS, 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 REF192FS part is unused and in its original packaging.
Return procedure for REF192FS:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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