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Analog Devices Inc. LTC1274ISW#TRPBF
- Part No.:
- LTC1274ISW#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 24-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
LTC1274ISW#TRPBF.pdf
- Description:
- IC ADC 12BIT SAR 24SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,955
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Product details
Overview
LTC1274ISW#TRPBF 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 sleep-mode current. It integrates a 2.42V precision reference, internal clock, and 2µs sample-and-hold - enabling direct connection to microprocessors in portable data acquisition and DSP systems.
For engineers reviewing the LTC1274ISW#TRPBF datasheet, LTC1274ISW#TRPBF pinout, LTC1274ISW#TRPBF application, or LTC1274ISW#TRPBF equivalent, key selection criteria include unipolar/bipolar mode support, 12-bit parallel output timing, REFRDY wake-up signaling, and SO-24 package compatibility with industrial temperature range (–40°C to +85°C).
Technical Context
The LTC1274ISW#TRPBF implements a capacitive DAC-based SAR architecture with zeroing switches and internal comparator offset nulling. Its conversion cycle begins on CONVST falling edge (with CS low), completes in 6–8µs, and delivers 12-bit output via three-state parallel bus (D11–D0) synchronized to RD/CS control logic.
It supports dual supply operation (5V or ±5V), with analog input ranges of 0V–4.096V (unipolar) or ±2.048V (bipolar), and features factory-trimmed 2.42V bandgap reference with ±10ppm/°C tempco. The REFRDY signal asserts after 3.3–4.2ms following SLEEP deassertion, confirming reference stability before sampling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit with no missing codes - guarantees monotonic transfer function for accurate linear measurements. |
| Sampling Rate | 100ksps maximum - enables real-time capture of signals up to 350kHz full-linear bandwidth. |
| Power Dissipation | 10mW at 100ksps (5V supply) - suitable for battery-powered systems requiring sustained high-speed conversion. |
| Sleep Current | 1µA - reduces system standby power without external sequencing circuitry. |
| Integral Linearity | ±1 LSB - ensures <0.025% end-point error across full-scale range for precision instrumentation. |
| Signal-to-Noise+Distortion | 72.5dB at 100kHz input - corresponds to ~11.7 ENOB, supporting dynamic signal analysis in telecom/audio applications. |
| Analog Input Range | 0V to 4.096V (unipolar, 1mV/LSB) - matches standard 12-bit scaling for seamless interface with 4.096V reference systems. |
Pinout & Package
Package: 24-lead plastic SO wide (SW), RoHS-compliant, industrial temperature grade (–40°C to +85°C).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AIN (1) | Analog input | Single-ended voltage input; accepts 0V–4.096V (unipolar) or ±2.048V (bipolar) with ≤±1µA leakage. |
| VREF (2) | Reference output | 2.42V ±20mV bandgap reference; requires 10µF tantalum + 0.1µF ceramic bypass; can be overdriven externally. |
| AGND (3) | Analog ground | Separate ground return for analog section; must be tied to DGND at single point to minimize noise coupling. |
| D11–D4 (4–11) | Data outputs (MSB byte) | Three-state parallel outputs; D11 = MSB; active when CS low and RD low; compatible with 5V TTL/CMOS logic. |
| DGND (12) | Digital ground | Dedicated ground for digital I/O; isolation from AGND prevents digital switching noise from corrupting analog accuracy. |
| D3–D0 (13–16) | Data outputs (LSB byte) | Three-state parallel outputs; D0 = LSB; timing-critical access window starts 50ns after RD↓ (CL=20pF). |
| REFRDY (17) | Status output | Open-drain signal goes high after reference settles post-SLEEP; used to gate CONVST in low-power polling systems. |
| SLEEP (18) | Control input | Active-low enable for 1µA shutdown mode; pulls REFRDY low during sleep; wake-up latency 3.3–4.2ms depending on CREF. |
| CONVST (19) | Control input | Falling-edge-triggered conversion start; requires minimum 40ns pulse width and setup time relative to CS. |
| RD (20) | Control input | Read strobe enabling data bus drivers; must be asserted after BUSY↑ with ≥20ns hold time before BUSY falls. |
| CS (21) | Control input | Chip select enabling CONVST/RD recognition; must be low during conversion initiation and data read cycles. |
| BUSY (22) | Status output | Active-low open-drain flag indicating conversion in progress; rising edge marks data validity for latching. |
| VSS (23) | Negative supply | Tied to AGND for unipolar mode; –5V for bipolar mode; bypassed with 0.1µF ceramic to AGND. |
| VDD (24) | Positive supply | +5V supply (4.75–5.25V); bypassed with 10µF tantalum + 0.1µF ceramic to AGND; powers analog and digital sections. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 2.42V reference | Factory-trimmed ±10ppm/°C tempco and ±0.01 LSB/V line regulation - eliminates need for external reference in cost-sensitive designs. |
| 1µA Sleep mode | Enables ultra-low-power duty-cycled operation without external power gating; REFRDY confirms readiness before sampling. |
| 12-bit parallel interface | Direct connection to 8/16-bit µP buses with minimal glue logic; three-state outputs reduce bus contention in multi-device systems. |
| Unipolar/bipolar mode support | Single device handles both 0–4.096V sensor outputs and ±2.048V differential signals - simplifies BOM across measurement variants. |
| 72.5dB S/(N+D) @ 100kHz | Validates usable resolution for audio-band and baseband telecom signals without oversampling or external filtering. |
Applications
| Portable Data Loggers | Industrial Sensor Interfaces |
|---|---|
|
Use Scenario: Battery-powered environmental monitors acquiring temperature, pressure, and humidity at 100ksps burst rates. IC Role / Device Role / Timing Role: Primary A/D converter capturing conditioned analog sensor outputs with 12-bit fidelity and minimal power overhead. Use Value: 1µA sleep current extends battery life between logging intervals; integrated reference eliminates calibration drift in field-deployed units. |
Use Scenario: PLC analog input modules digitizing 4–20mA transducer signals in harsh factory environments. IC Role / Device Role / Timing Role: High-accuracy front-end ADC converting isolated analog inputs into parallel digital words for FPGA or ARM processor ingestion. Use Value: ±1 LSB INL ensures compliance with IEC 61000-4-5 surge immunity requirements; SO-24 package supports conformal coating. |
| Audio Signal Analyzers | DSP-Based Spectrum Monitoring |
|
Use Scenario: Handheld spectrum analyzers performing real-time FFT on audio-frequency signals up to 50kHz. IC Role / Device Role / Timing Role: High-fidelity sampling engine feeding 12-bit data to fixed-point DSP for spectral decomposition. Use Value: 72.5dB S/(N+D) at 100kHz preserves dynamic range for detecting low-level harmonics; 350kHz full-linear bandwidth supports undersampling techniques. |
Use Scenario: Wireless base station monitoring equipment tracking RF interference across multiple channels simultaneously. IC Role / Device Role / Timing Role: Multi-channel ADC subsystem digitizing downconverted IF signals for digital demodulation and anomaly detection. Use Value: Bipolar ±2.048V input range accommodates AC-coupled IF stages; 100ksps throughput enables 50kHz Nyquist-limited channelization. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 12-bit SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS7822U | 2.7–5.25V supply, SPI interface, no internal reference, 1µA shutdown, 200ksps max | Requires external reference and serial interface logic; better suited for space-constrained PCBs with existing SPI infrastructure | Select when board area is critical and serial interface preferred over parallel bus; verify external reference stability meets 12-bit accuracy needs. |
| MAX11131AUT+ | 2.7–3.6V supply only, 12-bit, 500ksps, internal reference, 1.5µA shutdown, 8-pin µMAX | Higher speed but narrower supply range; smaller package limits thermal dissipation in continuous 100ksps operation | Choose for 3.3V-only systems needing faster sampling; confirm thermal design supports 10mW dissipation in µMAX footprint. |
Compared with ADS7822U and MAX11131AUT+, the LTC1274ISW#TRPBF provides guaranteed 12-bit no-missing-code performance with integrated 2.42V reference and industrial-grade SO-24 packaging - making it optimal for robust, parallel-interface industrial data acquisition where layout simplicity and long-term calibration stability are prioritized over raw speed or minimal footprint.
Availability
LTC1274ISW#TRPBF is available at Aetrix Electronics and suitable for portable instrumentation, industrial sensor interfaces, and audio signal analyzers requiring stable component supply with guaranteed industrial temperature operation and long-term availability.
Supply support for LTC1274ISW#TRPBF 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 technologies, serving industrial, automotive, communications, and healthcare markets.
The LTC1274ISW#TRPBF belongs to ADI's legacy Linear Technology precision data conversion product line, designed specifically for low-power, high-accuracy industrial and portable measurement systems requiring integrated references and simple µP interfacing.
FAQ
What is the operating temperature range for the LTC1274ISW#TRPBF?
The LTC1274ISW#TRPBF is rated for industrial operation from –40°C to +85°C. This range is validated across all electrical specifications including integral linearity (±1 LSB), reference voltage stability (±20mV), and 100ksps timing parameters. The SO-24 wide-body package provides thermal robustness for deployment in uncontrolled environments where ambient temperatures exceed commercial-grade limits.
Does the LTC1274ISW#TRPBF require an external clock source?
No, the LTC1274ISW#TRPBF does not require an external clock source. It contains a fully integrated, internally synchronized clock circuit that enables autonomous 100ksps operation. The internal clock eliminates timing jitter from external sources and removes the need for clock distribution routing - simplifying PCB layout and improving SNR consistency across production units of LTC1274ISW#TRPBF.
How does the REFRDY signal function during wake-up from Sleep mode?
The REFRDY signal on the LTC1274ISW#TRPBF goes low during Sleep mode and transitions high only after the internal 2.42V reference has settled to within specification (typically 3.3–4.2ms depending on VREF bypass capacitance). This provides a hardware-synchronized ready indication, allowing system firmware to delay CONVST assertion until reference stability is guaranteed - ensuring first-conversion accuracy of LTC1274ISW#TRPBF is maintained after low-power states.
Can the LTC1274ISW#TRPBF operate with a 3.3V digital interface?
No, the LTC1274ISW#TRPBF is not compatible with 3.3V digital logic levels. Its digital I/O (RD, CS, CONVST, BUSY, REFRDY, D11–D0) are specified for 5V operation only, with VIH(min) = 2.4V and VOL(max) = 0.4V at IO = 1.6mA. For 3.3V µP interfacing, level-shifting circuitry or use of the pin-compatible LTC1277ISW#TRPBF (which supports VLOGIC = 2.7–5.25V) is required instead of LTC1274ISW#TRPBF.
What is the maximum analog input frequency supported by the LTC1274ISW#TRPBF?
The LTC1274ISW#TRPBF maintains 68dB S/(N+D) - equivalent to 11 effective bits - up to 350kHz input frequency (full-linear bandwidth). Its full-power bandwidth is 2MHz, meaning it can reconstruct full-scale sine waves with ≤3dB amplitude loss at that frequency. These characteristics allow undersampling of IF signals beyond Nyquist, provided input anti-alias filtering is applied per the application's specific spectral requirements for LTC1274ISW#TRPBF.
LTC1274ISW#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 24-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- 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#TRPBF FAQ
1.How can I place an order for LTC1274ISW#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1274ISW#TRPBF 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#TRPBF reliable?
The price and inventory of LTC1274ISW#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1274ISW#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1274ISW#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1274ISW#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1274ISW#TRPBF?
LTC1274ISW#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1274ISW#TRPBF 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#TRPBF?
For technical support, including LTC1274ISW#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1274ISW#TRPBF requirements.
6.How does Aetrix verify that LTC1274ISW#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1274ISW#TRPBF 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#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1274ISW#TRPBF?
All LTC1274ISW#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1274ISW#TRPBF, 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#TRPBF part is unused and in its original packaging.
Return procedure for LTC1274ISW#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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