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Analog Devices Inc. REF198ESZ
- Part No.:
- REF198ESZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Voltage Reference
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
REF198ESZ.pdf
- Description:
- IC VREF SERIES 0.05% 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:648
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Product details
Overview
REF198ESZ from Analog Devices is a precision micropower low-dropout voltage reference IC delivering 4.096 V output with ±2 mV initial accuracy, 5 ppm/°C max temperature coefficient, and 30 mA output current capability - used in high-resolution ADC/DAC biasing and portable instrumentation where stable excitation voltage is critical.
For engineers reviewing the REF198ESZ datasheet, REF198ESZ pinout, REF198ESZ application, or REF198ESZ equivalent, key selection criteria include dropout voltage (≤0.6 V at 10 mA), sleep-mode supply current (≤15 μA), load regulation (≤4 ppm/mA), and extended industrial temperature range (−40°C to +85°C) with typical performance to +125°C.
Technical Context
The REF198ESZ implements a patented curvature-corrected band gap core with laser-trimmed thin-film resistors to achieve ultra-low drift and high initial accuracy. Its low-dropout architecture enables operation with only 100 mV headroom above the 4.096 V output, supporting single-supply systems powered by batteries or low-voltage rails.
Sleep mode is controlled via a dedicated TTL/CMOS-compatible SLEEP pin, reducing quiescent current from ≤45 μA to ≤15 μA while disabling output - essential for intermittent-sampling sensor nodes and solar-powered data loggers requiring microamp-level standby power.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Output Voltage | 4.096 V - precisely matches 12-bit full-scale reference for 4096-count ADCs without scaling. |
| Initial Accuracy | ±2 mV maximum at 25°C - ensures <0.05% absolute error before calibration in precision measurement front-ends. |
| Tempco | 5 ppm/°C maximum (E grade) - contributes ≤0.4 mV drift over −40°C to +85°C ambient range. |
| Dropout Voltage | 0.60 V max at 10 mA (VS = 5.10 V) - allows operation from 4.7 V supply in battery-powered designs. |
| Supply Current | 45 μA max active, 15 μA max sleep - enables >1-year battery life in 10-second wake-up interval sensor nodes. |
| Load Regulation | 4 ppm/mA maximum - maintains <17 μV change per mA load shift, critical for ratiometric sensor bridges. |
| Line Regulation | 4 ppm/V maximum - rejects supply ripple better than 0.0004%/V, simplifying LDO filtering requirements. |
Pinout & Package
REF198ESZ is housed in an 8-lead SOIC_N (SO-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 Trim Test Point | No user connection; internal Zener zap node - floating or tied to GND causes output inaccuracy. |
| 2 (VS) | Positive Supply Input | Accepts 4.7 V to 15 V; dropout as low as 0.6 V enables direct Li-ion or 5 V rail use. |
| 3 (SLEEP) | Digital Sleep Control | TTL/CMOS-compatible input; low = output disabled, IQ ≤15 μA; high = normal operation. |
| 4 (GND) | Analog Ground Reference | Must be star-connected to system ground; bypass capacitor (1 μF) required between Pin 7 and Pin 4. |
| 5 (TP) | Factory Trim Test Point | No user connection; variable resistance post-trim - any external load degrades accuracy. |
| 6 (NC) | No Connect | Internally unconnected; leave floating per datasheet - no tie to GND or VS. |
| 7 (OUTPUT) | Precision Voltage Output | 4.096 V source/sink up to ±30 mA; requires 1 μF ceramic capacitor to GND for stability. |
| 8 (NC) | No Connect | Internally unconnected; leave floating - routing to other nets may induce noise coupling. |
Key Features
| Feature | Design Value |
|---|---|
| Curvature-Corrected Band Gap Core | Enables 5 ppm/°C tempco without external compensation components or complex PCB layout. |
| Active Sleep Mode | Reduces supply current to ≤15 μA while maintaining fast wake-up (<10 μs), ideal for duty-cycled IoT sensors. |
| Laser-Trimmed Thin-Film Resistors | Guarantees ±2 mV initial accuracy without post-assembly calibration in production test flow. |
| Low Dropout Architecture | Operates with only 100 mV overhead - supports direct connection to 4.2 V Li-ion cells or 4.5 V buck converters. |
| Short-Circuit Protected Output | Withstands indefinite output-to-GND faults without damage or parameter shift, improving field reliability. |
Applications
| Portable Instrumentation | High-Resolution Data Acquisition |
|---|---|
|
Use Scenario: Handheld multimeters and portable gas analyzers operating on two AA cells (2.4–3.2 V) with boost-regulated 5 V rail. IC Role / Device Role / Timing Role: Primary 4.096 V reference for 24-bit sigma-delta ADC, providing ratiometric excitation to sensor bridges and reference for DAC-controlled display backlight. Use Value: 5 ppm/°C tempco and 4 ppm/mA load regulation ensure <0.01% reading drift across battery discharge and ambient temperature swings. |
Use Scenario: Industrial PLC analog input modules digitizing 4–20 mA loop signals with 16-bit SAR ADCs. IC Role / Device Role / Timing Role: Stable 4.096 V reference for both ADC conversion and precision 4–20 mA transmitter DAC, enabling true 16-bit system resolution. Use Value: ±2 mV initial accuracy eliminates need for per-channel calibration; sleep mode reduces module standby power by 67%. |
| Solar-Powered Remote Sensors | Loop-Powered Field Instruments |
|
Use Scenario: Wireless soil moisture sensor node powered by 3.7 V LiFePO₄ cell charged via 6 V solar panel with MPPT. IC Role / Device Role / Timing Role: Low-quiescent 4.096 V reference for ADC measuring capacitive soil probes; enabled only during 100-ms sampling bursts. Use Value: 15 μA sleep current extends 2000 mAh battery life to >5 years at 1-minute sampling intervals. |
Use Scenario: Two-wire 4–20 mA pressure transmitter with HART digital overlay, powered entirely from loop current. IC Role / Device Role / Timing Role: Micropower 4.096 V reference for signal conditioning and HART modem biasing, drawing <45 μA from 4 mA minimum loop current. Use Value: 0.6 V dropout allows operation down to 4.7 V loop compliance, preserving margin for long cable runs and fieldbus splitters. |
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 | 4.096 V, 3 ppm/°C max tempco, 950 μA supply current, no sleep mode | Better drift spec but 21× higher quiescent current; requires external enable logic for low-power cycling | Choose ADR4540BRZ when ultimate stability outweighs battery life; avoid if sleep control or <50 μA IQ is mandatory. |
| MAX6126AASA41 | 4.096 V, 5 ppm/°C max tempco, 350 μA supply current, no sleep pin | Higher IQ limits usable duty cycle; pinout incompatible - no SLEEP or TP pins | Choose MAX6126AASA41 only for cost-sensitive non-battery applications where sleep mode is unnecessary. |
Compared with REF198ESZ, ADR4540BRZ offers superior temperature stability but lacks integrated sleep control and consumes significantly more current, while MAX6126AASA41 provides similar accuracy at lower cost but cannot support microamp-level standby operation or factory-trimmed test point isolation.
Availability
REF198ESZ is available at Aetrix Electronics and suitable for portable instrumentation, high-resolution data acquisition, and solar-powered remote sensors requiring stable component supply with guaranteed long-term availability and traceable lot history.
Supply support for REF198ESZ 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, headquartered in Norwood, MA, with design centers worldwide and ISO 9001-certified manufacturing.
The REF19x series was designed specifically for micropower, low-dropout precision reference applications in battery-operated and energy-constrained systems - emphasizing ultra-low IQ, sleep-mode control, and robustness across extended temperature ranges.
FAQ
What is the nominal output voltage of the REF198ESZ?
The REF198ESZ delivers a precise 4.096 V nominal output voltage, optimized to serve as a full-scale reference for 12-bit analog-to-digital converters and matched with common DAC resolutions. This value is laser-trimmed during manufacturing and specified with ±2 mV initial accuracy across the E-grade temperature range (−40°C to +85°C).
Does the REF198ESZ require an output bypass capacitor?
Yes, the REF198ESZ requires a minimum 1 μF ceramic capacitor connected between the OUTPUT (Pin 7) and GND (Pin 4) pins for stability and noise reduction. Omitting this capacitor may cause oscillation or degraded load regulation, especially under dynamic current conditions. The capacitor must be placed as close as possible to the device pins.
Can the REF198ESZ operate from a 4.2 V lithium-ion battery?
Yes, the REF198ESZ can operate directly from a 4.2 V Li-ion cell. With a maximum dropout voltage of 0.60 V at 10 mA load, it maintains regulation down to 4.696 V supply - well within the 4.2 V nominal and 4.35 V fully charged range of standard Li-ion cells. No intermediate LDO is needed.
What is the function of Pins 1 and 5 on the REF198ESZ?
Pins 1 and 5 on the REF198ESZ are factory test points (TP) used for Zener-zap trimming of the output voltage during production. They are not intended for user connection. Leaving them unconnected preserves the specified ±2 mV accuracy; any external connection introduces unpredictable resistance and degrades output stability.
How does sleep mode affect the REF198ESZ output and supply current?
When the SLEEP pin (Pin 3) is driven low (≤0.8 V), the REF198ESZ disables its output stage and reduces supply current to ≤15 μA. The output voltage drops to near 0 V and is high-impedance. Upon returning the SLEEP pin high (≥2.4 V), the output stabilizes to 4.096 V within <10 μs, resuming full specification compliance.
REF198ESZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Series:
- REF19
- Packaging:
- Tube
- Product Status:
- Active
- Reference Type:
- Series
- Output Type:
- Fixed
- Voltage - Output (Min/Fixed):
- 4.096V
- Voltage - Output (Max):
- -
- Current - Output:
- 30 mA
- Tolerance:
- ±0.05%
- Temperature Coefficient:
- 5ppm/°C
- Noise - 0.1Hz to 10Hz:
- 40µVp-p
- Noise - 10Hz to 10kHz:
- -
- Voltage - Input:
- 4.5V ~ 15V
- Current - Supply:
- 45µA
- Current - Cathode:
- -
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
REF198ESZ FAQ
1.How can I place an order for REF198ESZ through Aetrix?
Please submit a Request for Quotation (RFQ) for REF198ESZ 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 REF198ESZ reliable?
The price and inventory of REF198ESZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for REF198ESZ is usually 5 days.
3.What payment methods are accepted for REF198ESZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for REF198ESZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for REF198ESZ?
REF198ESZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your REF198ESZ 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 REF198ESZ?
For technical support, including REF198ESZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your REF198ESZ requirements.
6.How does Aetrix verify that REF198ESZ is sourced from the original manufacturer or authorized distributors?
All REF198ESZ 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 REF198ESZ meets industry standards.
7.What is the process for return or replacement of REF198ESZ?
All REF198ESZ units undergo pre-shipment inspection (PSI). If there is an issue with REF198ESZ, 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 REF198ESZ part is unused and in its original packaging.
Return procedure for REF198ESZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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