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Analog Devices Inc. LTC1274ISW#PBF
- Part No.:
- LTC1274ISW#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 24-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
LTC1274ISW#PBF.pdf
- Description:
- IC ADC 12BIT SAR 24SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,763
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Product details
Overview
LTC1274ISW#PBF from Analog Devices (formerly Linear Technology) is a 12-bit successive-approximation ADC with single-ended analog input, 100ksps sampling rate, 10mW typical power dissipation at 5V, and 1µA shutdown current in Sleep mode. It integrates a 2.42V precision reference, internal clock, and sample-and-hold - enabling direct connection to microprocessors in industrial data acquisition systems requiring low-power, high-accuracy digitization of 0V–4.096V unipolar or ±2.048V bipolar signals.
For engineers reviewing the LTC1274ISW#PBF datasheet, LTC1274ISW#PBF pinout, LTC1274ISW#PBF application, or LTC1274ISW#PBF equivalent, key selection criteria include its 12-bit no-missing-codes performance, 72dB S/(N+D) at 100kHz input, 82dB THD, 24-pin SO wide package, and REFRDY-synchronized wake-up from 1µA Sleep mode - critical for battery-powered portable instrumentation and multiplexed sensor systems.
Technical Context
The LTC1274ISW#PBF implements a capacitive DAC-based successive approximation architecture with internal zeroing switches and comparator offset nulling during acquisition. Its 8µs conversion time and 0.35–2µs acquisition window support deterministic timing control via CONVST, BUSY, and RD signals under CS-gated operation.
It operates from single 5V or dual ±5V supplies, supports both unipolar (0V–4.096V) and bipolar (±2.048V) input ranges with 1mV/LSB resolution, and features internally trimmed reference output (2.42V ±20mV) with ±10ppm/°C tempco - all validated across –40°C to +85°C industrial temperature range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit with no missing codes - guarantees monotonic transfer function and full-scale linearity for precision measurement applications. |
| Sampling Rate | 100ksps maximum - enables real-time capture of signals up to 350kHz full-linear bandwidth (S/(N+D) ≥ 68dB). |
| Power Dissipation | 10mW at 100ksps (5V supply) - reduces thermal load and simplifies power budgeting in dense PCB layouts. |
| Sleep Current | 1µA - allows extended battery life in portable systems by powering down between conversions without losing reference stability. |
| Integral Linearity | ±1 LSB - ensures ≤0.024% full-scale error for calibration-sensitive applications like sensor front-ends and process control. |
| Reference Output | 2.42V ±20mV with ±10ppm/°C tempco - provides stable scaling for 0V–4.096V unipolar input (1mV/LSB), eliminating need for external reference. |
| Signal-to-Noise+Distortion | 72.5dB typ at 100kHz input - delivers >11.7 effective bits (ENOB) for high-fidelity signal reconstruction in audio and telecom processing. |
Pinout & Package
24-lead plastic SO wide (SW) package, 0.300" body width, RoHS-compliant, rated for industrial temperature range (–40°C to +85°C). Thermal resistance θJA = 130°C/W; TJMAX = 110°C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AIN (Pin 1) | Analog Input | Single-ended input node accepting 0V–4.096V (unipolar) or ±2.048V (bipolar); requires <2µs settling after sample phase for full accuracy. |
| VREF (Pin 2) | Reference Output | 2.42V bandgap reference output; must be bypassed with 10µF tantalum + 0.1µF ceramic to AGND for <1 LSB noise; supports overdrive for span adjustment. |
| AGND (Pin 3) | Analog Ground | Separate ground return for analog circuitry; must be tied to DGND at single point to minimize digital noise coupling into conversion path. |
| D11–D4 (Pins 4–11) | Data Outputs (MSB) | Three-state parallel outputs; D11 = MSB; driven only when CS and RD are active low; high-impedance when CS high. |
| DGND (Pin 12) | Digital Ground | Digital logic ground reference; isolation from AGND prevents ground bounce from corrupting analog sampling. |
| D3–D0 (Pins 13–16) | Data Outputs (LSB) | Three-state parallel outputs; D0 = LSB; synchronized to RD falling edge; valid within 50ns (CL=20pF) after RD assertion. |
| REFRDY (Pin 17) | Reference Ready Flag | Open-drain output indicating VREF has settled post-Sleep; goes high after 3.3–4.2ms (dependent on CREF), enabling safe conversion restart. |
| SLEEP (Pin 18) | Power-Down Control | Active-low input; pulls device into 1µA Sleep mode when low; forces REFRDY low until wake-up completes. |
| CONVST (Pin 19) | Conversion Start | Edge-triggered input; falling edge initiates SAR cycle; requires CS low to be recognized; minimum pulse width 40ns. |
| RD (Pin 20) | Data Read Enable | Active-low strobe enabling output drivers; data valid t9 = 50–170ns after RD↓ depending on load capacitance. |
| CS (Pin 21) | Chip Select | Active-low enable for CONVST and RD recognition; must be low before CONVST or RD transitions to avoid undefined behavior. |
| BUSY (Pin 22) | Conversion Status | Active-low open-drain flag; goes low at CONVST↓ and rises ~6–8µs later to indicate data ready; used for handshaking with µP. |
| VSS (Pin 23) | Negative Supply | Tied to AGND for unipolar operation; connected to –5V for bipolar mode; defines input common-mode range and reference headroom. |
| VDD (Pin 24) | Positive Supply | +5V supply (4.75–5.25V); powers analog core, reference, and digital interface; bypassed with 10µF + 0.1µF to AGND. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 2.42V reference | Factory-trimmed bandgap with ±10ppm/°C drift enables stable 1mV/LSB scaling without external components or calibration. |
| 1µA Sleep mode with REFRDY | Guarantees reference re-stabilization before next conversion, eliminating startup uncertainty in intermittent-sampling systems. |
| 8µs conversion time | Fixed-duration SAR cycle allows precise timing budgeting in deterministic real-time control loops and synchronized data capture. |
| Unipolar/bipolar mode support | Single hardware configuration handles both 0–4.096V sensor outputs and ±2.048V differential transducer signals without external level-shifting. |
| 24-pin SO wide package | Standard footprint with 0.300" width provides mechanical robustness and thermal margin (θJA=130°C/W) for industrial environments. |
Applications
| Portable Data Loggers | Industrial Sensor Interfaces |
|---|---|
|
Use Scenario: Battery-powered environmental monitors logging temperature, humidity, and pressure over weeks using intermittent 100ksps bursts. IC Role / Device Role / Timing Role: Primary ADC capturing calibrated analog sensor outputs; triggered by µP on scheduled intervals; REFRDY synchronizes wake-up to avoid invalid samples. Use Value: 1µA Sleep current extends battery life >10× vs active-mode operation; integrated reference eliminates external component count and drift-induced calibration drift. |
Use Scenario: PLC analog input modules conditioning 4–20mA loop signals and thermocouple outputs in factory automation cabinets. IC Role / Device Role / Timing Role: High-accuracy digitizer for multi-channel multiplexed inputs; operates in bipolar mode for differential thermocouple measurements with cold-junction compensation. Use Value: ±1 LSB INL ensures <0.025% reading error across –40°C to +85°C; 72dB S/(N+D) preserves signal integrity in electrically noisy industrial enclosures. |
| PC-Based DAQ Systems | Audio Signal Analysis |
|
Use Scenario: USB-connected oscilloscope adapters acquiring transient waveforms from test equipment with host-controlled trigger timing. IC Role / Device Role / Timing Role: Front-end ADC interfaced directly to FPGA or microcontroller; uses BUSY and RD handshake for reliable data capture at 100ksps. Use Value: 8µs fixed conversion time enables predictable latency; parallel 12-bit output avoids serial overhead, maximizing throughput in PC-hosted applications. |
Use Scenario: Portable spectrum analyzers digitizing audio-band signals (20Hz–20kHz) for FFT-based harmonic analysis and THD measurement. IC Role / Device Role / Timing Role: Precision ADC capturing clean baseband signals; leverages 82dB THD and 72dB S/(N+D) to resolve low-level harmonics above noise floor. Use Value: Full-linear bandwidth of 350kHz supports oversampling and anti-alias filtering; internal reference ensures consistent amplitude scaling across measurement sessions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 12-bit, 100ksps ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS7822U | SPI interface, 2.7–5.25V supply, 1µA shutdown, but no internal reference - requires external 2.5V ref and level-shifting for 5V µP interface. | Best suited for space-constrained designs where serial interface and lower supply voltage flexibility outweigh parallel bus convenience. | Select ADS7822U when board area is limited and system already includes a precision 2.5V reference; avoid if existing design relies on parallel data bus timing. |
| MAX11131AUT+ | 12-bit, 500ksps, internal reference (2.048V), SPI interface, 1.25µA shutdown, but only specified for 0°C to +70°C commercial range. | Higher speed and lower power ideal for new portable designs, but lacks industrial temperature rating and parallel output compatibility. | Choose MAX11131AUT+ for next-gen battery-powered instruments needing >100ksps; reject for legacy industrial systems requiring pin-compatible replacement or –40°C operation. |
Compared with ADS7822U and MAX11131AUT+, the LTC1274ISW#PBF uniquely combines parallel 12-bit output, integrated 2.42V reference, industrial temperature rating, and deterministic 8µs conversion timing - making it irreplaceable in existing µP-based DAQ systems where layout, firmware, and calibration are fixed.
Availability
LTC1274ISW#PBF is available at Aetrix Electronics and suitable for portable instrumentation, industrial sensor interfaces, and PC-based data acquisition systems requiring stable component supply, long-term lifecycle support, and guaranteed industrial-grade performance.
Supply support for LTC1274ISW#PBF 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. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LTC1274ISW#PBF belongs to ADI's legacy Linear Technology precision data acquisition product line, engineered for low-power, high-accuracy digitization in resource-constrained embedded systems where integration, reliability, and temperature stability are critical.
FAQ
What is the operating temperature range for the LTC1274ISW#PBF?
The LTC1274ISW#PBF is rated for industrial temperature operation from –40°C to +85°C. This specification is guaranteed across all electrical parameters including integral linearity (±1 LSB), reference voltage (2.42V ±20mV), and sleep current (≤5µA max), making it suitable for deployment in harsh environments such as factory floors and outdoor monitoring equipment.
Does the LTC1274ISW#PBF require an external reference voltage?
No, the LTC1274ISW#PBF includes a factory-trimmed 2.42V internal reference connected to Pin 2 (VREF), which supports its full 0V–4.096V unipolar or ±2.048V bipolar input range. While the VREF pin can be overdriven with an external reference for span adjustment, external reference is not required for standard operation - reducing BOM count and layout complexity.
How does the REFRDY signal function during wake-up from Sleep mode?
The REFRDY signal on the LTC1274ISW#PBF goes low when SLEEP is asserted and remains low until the internal reference settles. After SLEEP returns high, REFRDY transitions high after 3.3–4.2ms (depending on CREF value), signaling that the reference is stable and the first valid conversion may begin. This eliminates guesswork in timing-critical systems.
What is the maximum sampling rate and corresponding power consumption of the LTC1274ISW#PBF?
The LTC1274ISW#PBF achieves a maximum sampling rate of 100ksps with 2mA typical supply current (10mW at 5V). At this rate, it maintains 72.5dB S/(N+D) and ±1 LSB integral linearity. Power scales linearly with sample rate, dropping to 1µA in Sleep mode - enabling dynamic power management in burst-acquisition applications.
Can the LTC1274ISW#PBF operate with a 3V digital interface?
No - the LTC1274ISW#PBF is a single-supply 5V ADC with digital I/O referenced to VDD (4.75–5.25V). Its logic thresholds (VIH = 2.4V min, VIL = 0.8V max) and output drive levels (VOH ≥ 4.0V at 200µA) are incompatible with 3V-only microcontrollers. For 3V logic compatibility, the pin-compatible LTC1277ISW#PBF (with separate VLOGIC pin) must be used instead.
LTC1274ISW#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 24-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Number of Bits:
- 12
- Sampling Rate (Per Second):
- 100k
- Number of Inputs:
- 1
- Input Type:
- Single Ended
- Data Interface:
- Parallel
- Configuration:
- S/H-ADC
- Ratio - S/H:ADC:
- 1:1
- Number of A/D Converters:
- 1
- Architecture:
- SAR
- Reference Type:
- External, Internal
- Voltage - Supply, Analog:
- 5V, -2.45V ~ 5.25
- Voltage - Supply, Digital:
- 5V
- Features:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 24-SOIC
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC1274ISW#PBF FAQ
1.How can I place an order for LTC1274ISW#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1274ISW#PBF 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 LTC1274ISW#PBF reliable?
The price and inventory of LTC1274ISW#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1274ISW#PBF is usually 5 days.
3.What payment methods are accepted for LTC1274ISW#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1274ISW#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1274ISW#PBF?
LTC1274ISW#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1274ISW#PBF 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 LTC1274ISW#PBF?
For technical support, including LTC1274ISW#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1274ISW#PBF requirements.
6.How does Aetrix verify that LTC1274ISW#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1274ISW#PBF 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 LTC1274ISW#PBF meets industry standards.
7.What is the process for return or replacement of LTC1274ISW#PBF?
All LTC1274ISW#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1274ISW#PBF, 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 LTC1274ISW#PBF part is unused and in its original packaging.
Return procedure for LTC1274ISW#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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