My Inquiry
My Account
Analog Devices Inc. LTC1274CSW#TRPBF
- Part No.:
- LTC1274CSW#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 24-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
LTC1274CSW#TRPBF.pdf
- Description:
- IC ADC 12BIT SAR 24SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,362
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LTC1274CSW#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, internal 2.42V reference, and 1µA shutdown current in Sleep mode. It operates from single 5V or ±5V supplies and delivers 72dB S/(N + D) at 100kHz input frequency - suited for portable data acquisition and embedded signal conditioning where low quiescent current and self-contained timing are critical.
For engineers reviewing the LTC1274CSW#TRPBF datasheet, LTC1274CSW#TRPBF pinout, LTC1274CSW#TRPBF application, or LTC1274CSW#TRPBF equivalent, this page provides verified technical context, real-world design meaning of key specs, validated pin functions, confirmed application roles, and two rigorously cross-checked alternative parts - all grounded in the official LTC1274/LTC1277 datasheet Rev. G and Linear Technology product documentation.
Technical Context
The LTC1274CSW#TRPBF implements a capacitor-based SAR architecture with integrated sample-and-hold, precision bandgap reference, and synchronized internal clock - eliminating external timing components. Its unipolar/bipolar conversion modes are selected by VSS connection (0V or –5V), and output format is 12-bit parallel straight binary (unipolar) or 2's complement (bipolar).
It features dual low-power states: Sleep mode (1µA, REFRDY assertion required before sampling) and full active operation (2mA at 100ksps). The analog input exhibits 45pF capacitance in sample mode and only 5pF during hold, enabling clean acquisition with minimal external drive requirements - compatible with op amps like LT1007 or LT1224 that settle within 2µs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit with no missing codes - guarantees monotonic transfer function and deterministic code transitions across full range. |
| Sampling Rate | 100ksps maximum - supports real-time digitization of signals up to ~350kHz full-linear bandwidth without aliasing degradation. |
| Power Dissipation | 10mW at 100ksps (5V supply) - enables battery-powered operation with >100-hour runtime on a 1000mAh cell at continuous sampling. |
| Input Range | 0V to 4.096V unipolar (1mV/LSB) or ±2.048V bipolar - matches standard 12-bit LSB scaling and simplifies gain calibration. |
| S/(N + D) | 72.5dB typical at 100kHz input - corresponds to ~11.8 ENOB, sufficient for high-fidelity audio and telecom baseband sampling. |
| Integral Linearity | ±1 LSB max - ensures <0.025% full-scale error, critical for precision instrumentation and closed-loop control feedback. |
| Shutdown Current | 1µA in Sleep mode - reduces average system power by >99.9% during idle intervals in duty-cycled measurement systems. |
Pinout & Package
Package: 24-lead plastic SO wide (SW), 0.300" body width, RoHS-compliant, JEDEC MS-013AC. Thermal resistance θJA = 130°C/W; TJMAX = 110°C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AIN (1) | Analog Input | Single-ended voltage input; accepts 0V–4.096V (unipolar) or ±2.048V (bipolar); requires <2µs settling after sample-phase current spike. |
| VREF (2) | Reference Output | 2.42V ±20mV factory-trimmed bandgap reference; can be overdriven externally; requires 10µF + 0.1µF bypass for low-noise operation. |
| AGND (3) | Analog Ground | Separate ground return for analog circuitry; must be tied to DGND at single point to minimize digital noise coupling. |
| D11–D4 (4–11) | Data Outputs (MSB) | Three-state parallel outputs; D11 = MSB; high-impedance when CS = high or RD = high; drives standard TTL/CMOS loads. |
| DGND (12) | Digital Ground | Dedicated ground for digital I/O; isolation from AGND prevents ground bounce from corrupting analog accuracy. |
| D3–D0 (13–16) | Data Outputs (LSB) | Three-state parallel outputs; D0 = LSB; latched valid after BUSY rising edge; timing-critical for microprocessor interface. |
| REFRDY (17) | Reference Ready Flag | Open-drain output goes high after reference settles post-Sleep wake-up; used to synchronize conversion start in low-power systems. |
| SLEEP (18) | Power-Down Control | Active-low input; pulls device into 1µA Sleep mode; REFRDY asserts only after internal reference stabilizes (~3.3–4.2ms depending on CREF). |
| CONVST (19) | Conversion Start | Edge-triggered input; falling edge initiates SAR cycle; must be asserted with CS low; minimum pulse width 40ns. |
| RD (20) | Data Read Enable | Active-low signal enabling output drivers; data valid t9 = 50–170ns after RD↓ depending on load capacitance. |
| CS (21) | Chip Select | Active-low enable for CONVST and RD recognition; must be low before CONVST↓ to avoid timing violation. |
| BUSY (22) | Conversion Status | Active-low open-drain output; goes low at CONVST↓, rises when conversion complete; used to latch result or trigger next sample. |
| VSS (23) | Negative Supply | Tied to 0V 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 Sample-and-Hold | 2µs acquisition time enables direct interface to low-settling op amps (e.g., LT1223), eliminating external SHA component and layout complexity. |
| Internal Trimmed Clock | Removes need for external crystal or oscillator; guarantees 100ksps timing accuracy across temperature and supply variations. |
| Overdrivable Reference Pin | VREF pin accepts external 2.45–5V references (e.g., LT1019A-2.5), enabling calibrated full-scale spans like 0–5V or ±4.23V without resistor networks. |
| 1µA Sleep Mode with REFRDY | Enables ultra-low-power duty cycling: device wakes, waits for REFRDY, samples, and returns to Sleep - ideal for sensor nodes with 1s+ intervals. |
| Unipolar/Bipolar Mode Switching | Mode selected solely by VSS connection (0V or –5V); no configuration registers or software overhead - simplifies firmware and reduces BOM count. |
Applications
| Battery-Powered Portable Systems | High-Speed Data Acquisition for PCs |
|---|---|
|
Use Scenario: Handheld multimeter or portable oscilloscope capturing transient waveforms with 12-bit resolution and sub-10µs conversion latency. IC Role / Device Role / Timing Role: Primary ADC digitizing front-end analog signals; uses internal clock and reference to eliminate external timing components and reduce PCB area. Use Value: 10mW active power and 1µA Sleep current extend battery life >10× versus comparable 12-bit ADCs without integrated reference or shutdown. |
Use Scenario: ISA/PCI add-in card acquiring multi-channel sensor data at 100ksps per channel for vibration analysis or ECG monitoring. IC Role / Device Role / Timing Role: Parallel-output ADC interfacing directly to microcontroller or FPGA data bus; BUSY and REFRDY signals simplify handshaking without polling overhead. Use Value: 12-bit parallel interface avoids serial protocol latency; 72dB S/(N + D) preserves dynamic range for FFT-based spectral analysis up to Nyquist. |
| Digital Signal Processing Front-End | Multiplexed Data Acquisition Systems |
|
Use Scenario: Real-time DSP board preprocessing analog inputs (audio, motor current) before FFT or filtering algorithms. IC Role / Device Role / Timing Role: High-fidelity analog-to-digital converter feeding fixed-point DSP; unipolar/bipolar flexibility accommodates AC-coupled or DC-coupled inputs. Use Value: ±1 LSB INL and 72dB S/(N + D) ensure minimal quantization distortion in feedback loops and adaptive filter coefficients. |
Use Scenario: Industrial PLC module scanning 16 thermocouple or RTD channels via analog multiplexer, with per-channel calibration. IC Role / Device Role / Timing Role: Shared ADC resource serving multiple inputs; fast 8µs conversion time and low 1µA Sleep current minimize per-channel overhead. Use Value: Internal 2.42V reference eliminates need for precision external reference per channel, reducing cost and thermal drift errors in multi-sensor systems. |
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 | 2.7V–5.25V supply; SPI interface; 200ksps; 1.25mW @ 100ksps; no internal reference - requires external 2.5V ref. | Lower power but serial interface increases MCU overhead; lacks Sleep mode flag (REFRDY) and bipolar support. | Prefer when board space is constrained and SPI is already used; avoid if bipolar input or hardware-synced low-power wake-up is required. |
| MAX1113CPE+ | 5V-only supply; 100ksps; 12-bit parallel; internal 4.096V ref; 2.5µA shutdown; no REFRDY; SO-24 package. | Higher shutdown current (2.5µA vs 1µA); no REFRDY signal complicates Sleep wake-up sequencing; fixed 4.096V ref limits span flexibility. | Acceptable for unipolar-only designs with relaxed power budget; not suitable for battery systems requiring guaranteed sub-2µA sleep or bipolar mode. |
Compared with ADS7822U and MAX1113CPE+, the LTC1274CSW#TRPBF uniquely combines 1µA Sleep current with REFRDY signaling, bipolar/unipolar mode selection via VSS, and internal trimmable reference - making it optimal for portable, multi-range, and ultra-low-power measurement systems where timing predictability and analog flexibility are non-negotiable.
Availability
LTC1274CSW#TRPBF is available at Aetrix Electronics and suitable for battery-powered portable systems, high-speed PC-based data acquisition, and industrial multiplexed sensor monitoring requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LTC1274CSW#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 acquired Linear Technology in 2017; Linear pioneered high-performance analog ICs including precision ADCs, references, and power management solutions for demanding industrial and instrumentation applications.
The LTC1274CSW#TRPBF belongs to Linear's legacy high-speed, low-power SAR ADC family designed specifically for portable test equipment, data loggers, and embedded systems needing self-contained timing, flexible input ranges, and sub-microamp shutdown capability.
FAQ
What is the maximum sampling rate of the LTC1274CSW#TRPBF?
The LTC1274CSW#TRPBF supports a maximum sampling rate of 100ksps, with typical conversion time of 6–8µs and acquisition time of 0.35–2µs. This rate is guaranteed across the commercial temperature range (0°C to 70°C) and maintains 72dB S/(N + D) at 100kHz input frequency - enabling undersampling of signals beyond Nyquist while preserving dynamic range.
Does the LTC1274CSW#TRPBF require an external clock source?
No, the LTC1274CSW#TRPBF does not require an external clock source. It integrates a synchronized internal clock optimized for 100ksps operation, eliminating timing jitter from external oscillators and reducing BOM count. The internal clock is factory-trimmed and temperature-compensated, ensuring stable sampling rate across supply and temperature variations without user calibration.
How does the Sleep mode work on the LTC1274CSW#TRPBF?
The LTC1274CSW#TRPBF enters Sleep mode when the SLEEP pin is driven low, reducing supply current to ≤5µA (typical 1µA). After wake-up, the internal 2.42V reference requires stabilization before sampling - signaled by the REFRDY pin going high. Wake-up time depends on VREF bypass capacitance: 3.3ms with 4.7µF, 4.2ms with 10µF. This sequence ensures accurate conversions post-wake-up.
Can the LTC1274CSW#TRPBF operate in bipolar mode?
Yes, the LTC1274CSW#TRPBF supports bipolar operation by connecting VSS to –5V (within –5.25V to –2.45V range). In this configuration, the analog input range becomes ±2.048V with 2's complement output coding. Unipolar mode uses VSS = 0V and yields 0V–4.096V input with straight binary output. Mode selection is hardware-defined - no register writes or software configuration needed.
What is the purpose of the REFRDY pin on the LTC1274CSW#TRPBF?
The REFRDY pin on the LTC1274CSW#TRPBF is an open-drain status signal that goes high when the internal 2.42V reference has fully settled after exiting Sleep mode. It provides hardware synchronization for the system controller, ensuring that conversion starts only after reference stability - preventing gain and offset errors caused by premature sampling. REFRDY assertion time is 3.3–4.2ms depending on VREF bypass capacitor value.
LTC1274CSW#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:
- 0°C ~ 70°C
- Supplier Device Package:
- 24-SOIC
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC1274CSW#TRPBF FAQ
1.How can I place an order for LTC1274CSW#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1274CSW#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 LTC1274CSW#TRPBF reliable?
The price and inventory of LTC1274CSW#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1274CSW#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1274CSW#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1274CSW#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1274CSW#TRPBF?
LTC1274CSW#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1274CSW#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 LTC1274CSW#TRPBF?
For technical support, including LTC1274CSW#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1274CSW#TRPBF requirements.
6.How does Aetrix verify that LTC1274CSW#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1274CSW#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 LTC1274CSW#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1274CSW#TRPBF?
All LTC1274CSW#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1274CSW#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 LTC1274CSW#TRPBF part is unused and in its original packaging.
Return procedure for LTC1274CSW#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LTC1274CSW#TRPBF Tags
-
ADC081C021CIMKX/NOPB
Texas Instruments
-
MCP3021A5T-E/OT
Microchip Technology
-
TLA2024IRUGR
Texas Instruments
-
MCP3221A5T-E/OT
Microchip Technology
-
MCP3221A5T-I/OT
Microchip Technology
-
MCP3221A4T-E/OT
Microchip Technology
-
MCP3221A6T-E/OT
Microchip Technology
-
MCP3221A0T-E/OT
Microchip Technology
-
MCP3221A1T-E/OT
Microchip Technology
-
ADC121S021CIMFX/NOPB
Texas Instruments
-
MCP3001-I/MS
Microchip Technology
-
MCP3001-I/SN
Microchip Technology
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
