My Inquiry
My Account
Analog Devices Inc. LTC1274CSW#PBF
- Part No.:
- LTC1274CSW#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 24-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
LTC1274CSW#PBF.pdf
- Description:
- IC ADC 12BIT SAR 24SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:120
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LTC1274CSW#PBF from Analog Devices (formerly Linear Technology) is a 12-bit successive-approximation analog-to-digital converter with single-ended input, 100ksps sampling rate, 10mW typical power dissipation at 5V, and 1µA shutdown current in Sleep mode. It integrates an internal 2.42V reference, 2µs sample-and-hold, and synchronized clock, enabling direct connection to microprocessors in portable data acquisition systems.
For engineers reviewing the LTC1274CSW#PBF datasheet, LTC1274CSW#PBF pinout, LTC1274CSW#PBF application, or LTC1274CSW#PBF equivalent, key selection criteria include unipolar/bipolar input range flexibility (0V–4.096V / ±2.048V), REFRDY wake-up signaling, 24-pin SOIC-W package compatibility, and 12-bit parallel output timing compliance with 8µs conversion time.
Technical Context
The LTC1274CSW#PBF implements a capacitive DAC-based successive approximation architecture with zeroing switches and internal clock synchronization. Its analog front-end supports both unipolar (0V–4.096V) and bipolar (±2.048V) operation via VSS configuration, and features a 2.42V factory-trimmed bandgap reference with ±10ppm/°C tempco.
Digital interface uses asynchronous parallel bus control with CS, CONVST, RD, BUSY, and REFRDY signals. Conversion is initiated on CONVST falling edge (tCONV = 6–8µs), with data valid before BUSY rising edge (t6 = 20–65ns) and 12-bit output latched on RD assertion. SLEEP pin enables 1µA quiescent current mode with 3.3–4.2ms wake-up to REFRDY high.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit with no missing codes - guarantees monotonic transfer function for precision measurement applications. |
| Sampling Rate | 100ksps maximum - supports real-time signal capture up to 50kHz Nyquist bandwidth with undersampling capability. |
| Power Dissipation | 10mW typical at 100ksps - enables battery-powered operation with minimal thermal impact in compact PCB layouts. |
| Input Range | 0V to 4.096V unipolar or ±2.048V bipolar - provides 1mV/LSB step size and seamless mode switching via VSS pin configuration. |
| S/(N + D) | 72.5dB typical at 100kHz input - delivers >11.7 effective bits (ENOB) for high-fidelity audio and telecom signal digitization. |
| Integral Linearity | ±1 LSB max - ensures accurate end-point calibration without software correction in industrial sensor interfaces. |
| Reference Voltage | 2.420V ±20mV - stable internal reference eliminates external component count while supporting overdrive for span adjustment. |
Pinout & Package
Package: 24-lead plastic SO wide (SW), 0.300" body width, RoHS-compliant lead finish (Pb-free).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AIN (1) | Analog Input | Single-ended input node accepting 0V–4.096V (unipolar) or ±2.048V (bipolar) signals; requires low-impedance drive for <2µs acquisition. |
| VREF (2) | Reference Output | 2.42V internal reference output; must be bypassed with 10µF tantalum + 0.1µF ceramic to AGND for noise suppression. |
| AGND (3) | Analog Ground | Separate ground return for analog circuitry; must be tied to DGND only at single point to minimize digital noise coupling. |
| D11–D4 (4–11) | Data Outputs (MSB) | Three-state parallel outputs; D11 is MSB; driven after RD assertion with 50–170ns access time depending on load capacitance. |
| DGND (12) | Digital Ground | Digital logic ground reference; isolated from AGND except at system star point to prevent ground loops. |
| D3–D0 (13–16) | Data Outputs (LSB) | Three-state parallel outputs; D0 is LSB; compatible with 5V TTL/CMOS logic families when VDD = 4.75–5.25V. |
| REFRDY (17) | Reference Ready Flag | Open-drain output indicating reference stability after Sleep wake-up; used to synchronize conversion start in low-power systems. |
| SLEEP (18) | Power-Down Control | Active-low input enabling 1µA shutdown mode; REFRDY goes low during Sleep and returns high after 3.3–4.2ms wake-up delay. |
| CONVST (19) | Conversion Start | Edge-triggered input initiating SAR cycle on falling edge; requires CS low to be recognized; minimum pulse width 40ns. |
| RD (20) | Data Read Enable | Active-low signal enabling three-state outputs; data valid within t9 (50–170ns) after RD↓ depending on CL. |
| CS (21) | Chip Select | Active-low enable for CONVST and RD inputs; must be low before CONVST falling edge to initiate conversion. |
| BUSY (22) | Conversion Status | Active-low open-drain output indicating conversion in progress; rising edge marks data readiness for latching. |
| VSS (23) | Negative Supply | Tied to AGND for unipolar mode; connected to –5V for bipolar operation; defines input common-mode range. |
| VDD (24) | Positive Supply | +5V supply (4.75–5.25V); powers analog and digital sections; bypassed with 10µF tantalum + 0.1µF ceramic to AGND. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 2.42V reference | Factory-trimmed ±20mV accuracy with ±10ppm/°C tempco eliminates need for external reference in cost-sensitive designs. |
| 1µA Sleep mode | Ultra-low quiescent current enables multi-day battery life in portable instruments without sacrificing ADC readiness latency. |
| Unipolar/bipolar dual-mode operation | Configurable input range via VSS pin simplifies hardware reuse across sensor types (e.g., pressure vs. differential voltage). |
| Internal synchronized clock | Removes external clock source requirement and associated jitter, improving SNR consistency in noisy environments. |
| REFRDY wake-up indicator | Hardware-synchronized flag prevents premature sampling after Sleep exit, ensuring reliable first-conversion accuracy. |
| 24-pin SOIC-W package | Industry-standard footprint with 0.300" width supports automated assembly and thermal management up to 110°C junction temperature. |
Applications
| Portable Data Loggers | Industrial Sensor Interfaces |
|---|---|
|
Use Scenario: Battery-powered environmental monitoring units logging temperature, humidity, and pressure at 100Hz intervals. IC Role / Device Role / Timing Role: Primary ADC acquiring conditioned analog sensor outputs with 12-bit resolution and automatic sleep/wake cycling between samples. Use Value: 1µA Sleep current extends coin-cell battery life beyond 2 years; integrated reference reduces BOM count by one precision component. |
Use Scenario: PLC analog input modules converting 4–20mA current loop signals into digital values for fieldbus transmission. IC Role / Device Role / Timing Role: High-accuracy ADC interfacing with op-amp I/V converters, operating in bipolar mode for bidirectional process control feedback. Use Value: ±1 LSB integral linearity ensures <0.025% full-scale error across temperature; 2.42V reference enables precise 4–20mA scaling without trimming. |
| Audio Signal Digitization | PC-Based Data Acquisition |
|
Use Scenario: Low-cost USB audio interfaces digitizing line-level signals up to 48kHz sampling rate using undersampling techniques. IC Role / Device Role / Timing Role: Front-end ADC capturing baseband audio with 72.5dB S/(N+D) at 100kHz input, leveraging full-linear bandwidth of 350kHz. Use Value: 11.7 ENOB at Nyquist supports CD-quality audio fidelity; single 5V supply simplifies power design versus dual-rail alternatives. |
Use Scenario: ISA/PCI add-in cards for laboratory test equipment requiring simultaneous multi-channel sampling at 100ksps. IC Role / Device Role / Timing Role: Parallel-output ADC synchronized to host bus timing via CS/CONVST/RD handshaking for deterministic latency. Use Value: 8µs conversion time and 50ns data access enable tight timing margins in high-throughput DAQ systems; 24-pin SOIC eases socketed prototyping. |
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 at 100ksps | No parallel bus; requires serial interface firmware overhead; lower power but higher latency per sample | Select for space-constrained designs where SPI is preferred and microcontroller has limited GPIO resources |
| MAX11131ETE+ | 2.7V–3.6V supply, 12-bit, 500ksps, internal reference, 12-lead TDFN | Higher speed but narrower supply range; smaller package limits thermal dissipation in continuous operation | Select for 3.3V systems needing faster throughput and smaller footprint, accepting reduced bipolar capability |
Compared with ADS7822U and MAX11131ETE+, the LTC1274CSW#PBF offers unique value in 5V parallel-bus systems requiring guaranteed 1µA shutdown, integrated 2.42V reference with overdrive support, and proven 12-bit linearity across commercial temperature range - making it optimal for legacy industrial and instrumentation designs.
Availability
LTC1274CSW#PBF is available at Aetrix Electronics and suitable for portable data loggers, industrial sensor interfaces, and PC-based data acquisition systems requiring stable component supply, long-term lifecycle support, and RoHS-compliant manufacturing.
Supply support for LTC1274CSW#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 LTC1274CSW#PBF belongs to ADI's legacy Linear Technology precision data conversion product line, designed specifically for low-power, high-accuracy measurement applications where integration of reference, clock, and sample-and-hold reduces system complexity and improves reliability.
FAQ
What is the maximum sampling rate supported by the LTC1274CSW#PBF?
The LTC1274CSW#PBF supports a maximum sampling rate of 100ksps, with guaranteed 12-bit performance and 72.5dB S/(N+D) at 100kHz input frequency. At this rate, conversion time is 6–8µs and acquisition time is 0.35–2µs, enabling real-time capture of signals up to 50kHz Nyquist bandwidth. The LTC1274CSW#PBF maintains usable ENOB (>11 bits) well beyond Nyquist, supporting undersampling applications.
How does the SLEEP mode function in the LTC1274CSW#PBF?
In SLEEP mode, the LTC1274CSW#PBF draws only 0.3–5µA supply current while disabling internal circuitry except the reference generator. The REFRDY pin goes low during Sleep and transitions high after a 3.3–4.2ms wake-up delay (dependent on CREF value), signaling readiness for the next conversion. This behavior is explicitly documented for the LTC1274CSW#PBF in the timing characteristics table and ensures first-sample accuracy after power-down.
Can the LTC1274CSW#PBF operate with a 3V digital interface?
No - the LTC1274CSW#PBF requires VDD = 4.75–5.25V and does not support 3V logic levels. Its digital outputs swing from 0V to VDD, with VOH ≥4.0V at IO = –200µA and VOL ≤0.1V at IO = 1.6mA under 5V operation. For 3V-compatible operation, the LTC1277CSW#PBF variant provides a separate VLOGIC pin supporting 2.7–5.25V logic supply, but the LTC1274CSW#PBF lacks this feature.
What is the input impedance of the LTC1274CSW#PBF analog input?
The LTC1274CSW#PBF analog input exhibits dynamic impedance: during hold mode, input capacitance is 5pF; during sample mode, it rises to 45pF. Input leakage current is ±1µA maximum with CS high. These values are measured and specified in the "Analog Input Characteristics" section of the datasheet, confirming the device's suitability for driving with standard op-amps like LT1007 or LT1224 without external buffering.
Does the LTC1274CSW#PBF support bipolar input configurations?
Yes - the LTC1274CSW#PBF supports bipolar operation with ±2.048V input range when VSS is connected to –5V (not AGND). In this mode, output coding follows 2's complement format, and offset error is specified as ±8 LSB. This bipolar capability is confirmed in the "Analog Input Range" and "Accuracy Characteristics" tables, distinguishing it from unipolar-only ADCs and enabling direct measurement of AC-coupled or differential signals.
LTC1274CSW#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:
- 0°C ~ 70°C
- Supplier Device Package:
- 24-SOIC
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC1274CSW#PBF FAQ
1.How can I place an order for LTC1274CSW#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1274CSW#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 LTC1274CSW#PBF reliable?
The price and inventory of LTC1274CSW#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1274CSW#PBF is usually 5 days.
3.What payment methods are accepted for LTC1274CSW#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1274CSW#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1274CSW#PBF?
LTC1274CSW#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1274CSW#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 LTC1274CSW#PBF?
For technical support, including LTC1274CSW#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1274CSW#PBF requirements.
6.How does Aetrix verify that LTC1274CSW#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1274CSW#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 LTC1274CSW#PBF meets industry standards.
7.What is the process for return or replacement of LTC1274CSW#PBF?
All LTC1274CSW#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1274CSW#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 LTC1274CSW#PBF part is unused and in its original packaging.
Return procedure for LTC1274CSW#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LTC1274CSW#PBF 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…
