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Analog Devices Inc. LTC1272-5ACSW#PBF
- Part No.:
- LTC1272-5ACSW#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 24-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
LTC1272-5ACSW#PBF.pdf
- Description:
- IC ADC 12BIT SAR 24SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,963
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Product details
Overview
LTC1272-5ACSW#PBF from Analog Devices (formerly Linear Technology) is a 12-bit, 3µs successive approximation ADC with on-chip sample-and-hold, single 5V supply operation, and AD7572-pin-compatible 24-pin SO wide package. It delivers up to 250kHz sampling rate, 72dB S/(N+D), and 2.42V internal reference - used in high-speed data acquisition systems requiring precise unipolar 0V–5V analog input conversion.
For engineers reviewing the LTC1272-5ACSW#PBF datasheet, LTC1272-5ACSW#PBF pinout, LTC1272-5ACSW#PBF application, or LTC1272-5ACSW#PBF equivalent, this page provides verified technical context, real-world timing constraints (e.g., 1µs minimum inter-conversion delay), true 12-bit dynamic performance (ENOB ≥11.5 at 20kHz), and validated drop-in replacement guidance versus AD7572.
Technical Context
The LTC1272-5ACSW#PBF implements a switched-capacitor SAR architecture with integrated 2.42V ±1% bandgap reference and internal sample-and-hold. Its 12-bit DAC uses binary-weighted capacitors, and conversion timing is synchronized to CLK IN edges with strict 40ns setup/hold margins relative to CS/RD for minimal clock feedthrough.
It supports two digital interface modes: Slow Memory Mode (conversion starts on RD↓, data valid after BUSY↑) and ROM Mode (RD↓ reads prior result while starting new conversion). HBEN enables byte-multiplexed 8-bit bus access by routing MSBs to D11–D8 and LSBs to D7–D0/8.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit with no missing codes - guarantees monotonic transfer function for precision control loops. |
| Conversion Time | 3µs typical - enables 250kHz sustained sampling, critical for real-time FFT-based signal analysis. |
| Reference Output | 2.42V ±1% with 25ppm/°C tempco - eliminates external reference need and simplifies layout in single-supply systems. |
| S/(N+D) Ratio | 72dB at 10kHz input - defines usable dynamic range for 11.5 effective bits up to 20kHz. |
| Supply Voltage | Single 5V (4.75V–5.25V) - removes negative rail requirement, reducing BOM count vs AD7572. |
| Sample-and-Hold Acquisition | 0.45µs to 1µs - sets minimum inter-conversion delay at 1µs for full accuracy. |
| Power Dissipation | 75mW typical - enables dense placement in thermally constrained embedded DAQ modules. |
Pinout & Package
Package: 24-lead plastic SO wide (SW), 0°C to 70°C operating temperature range, θJA = 130°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AIN (1) | Analog Input | 0V–5V unipolar input node; accepts up to 3.5mA DC current and 50pF capacitance. |
| VREF (2) | Reference Output | 2.42V output sourcing up to 1mA; requires 10µF + 0.1µF decoupling for low-noise DAC operation. |
| AGND (3) | Analog Ground | Single-point analog return; must be isolated from DGND except at star ground near pin 3. |
| D11–D4 (4–11) | Data Outputs (MSB–D4) | Three-state outputs; active when CS=RD=LOW; D11 is MSB in parallel read mode. |
| DGND (12) | Digital Ground | Digital return path; kept separate from AGND except at system-level star point. |
| D3/11–D0/8 (13–16) | Data Outputs (D3–D0 or MSB) | HBEN-controlled multiplexed outputs: HIGH → D11–D8 only; LOW → full 12-bit word. |
| CLK IN (17) | Timing Input | Accepts 4MHz TTL/CMOS clock or crystal; falling edge triggers bit decisions during conversion. |
| CLK OUT (18) | Timing Output | Inverted CLK IN signal; must minimize capacitance to avoid analog coupling into AIN path. |
| HBEN (19) | High-Byte Enable | Controls data bus multiplexing; HIGH disables conversion start and forces D7–D4 = LOW. |
| RD (20) | Read Control | Active-low; initiates conversion when CS and HBEN are low; enables output drivers. |
| CS (21) | Chip Select | Active-low enable for RD/HBEN recognition; must be stable before RD edge. |
| BUSY (22) | Status Output | Active-low open-drain signal indicating conversion in progress; used for polling or interrupt. |
| NC (23) | No Connect | Internally unconnected; accommodates AD7572's –15V pin without modification. |
| VDD (24) | Positive Supply | 5V supply input; draws 15–30mA depending on activity; bypass with 0.1µF ceramic. |
Key Features
| Feature | Design Value |
|---|---|
| AD7572 pin compatibility | Direct socket replacement with reversed VREF capacitor polarity and 1µs inter-conversion delay. |
| On-chip sample-and-hold | Eliminates external S/H IC and associated layout complexity; acquisition time ≤1µs. |
| Single 5V supply operation | Removes –15V rail requirement, reducing power supply design effort and cost. |
| Internal 2.42V reference | Factory-trimmed ±1%, 25ppm/°C drift - meets 12-bit accuracy without calibration. |
| ESD protection on all pins | Withstands >2kV HBM - improves robustness during board assembly and field handling. |
| Flexible data interface | Supports both 12-bit parallel (D11–D0/8) and 8-bit byte-multiplexed (HBEN-controlled) microprocessor buses. |
Applications
| High-Speed Data Acquisition | Digital Signal Processing (DSP) |
|---|---|
Use Scenario: Real-time vibration monitoring in industrial motor controllers using 1024-point FFT at 250kHz sampling. IC Role / Device Role / Timing Role: Primary sampling ADC providing synchronized 12-bit digitization of conditioned analog sensor signals. Use Value: 72dB S/(N+D) and 11.5 ENOB at 20kHz ensure accurate spectral analysis without external dither or oversampling. |
Use Scenario: Front-end digitization for fixed-point DSP engines in telecom baseband processing. IC Role / Device Role / Timing Role: High-throughput analog-to-digital interface feeding 16-bit parallel data bus of TI C5000-series processors. Use Value: HBEN-enabled byte-multiplexing allows seamless integration with 8-bit data paths without glue logic. |
| Multiplexed Data Acquisition Systems | Single Supply Systems |
Use Scenario: 16-channel thermocouple scanner using analog multiplexer and precision op-amp front-end. IC Role / Device Role / Timing Role: Central ADC shared across channels via analog MUX; relies on fast 3µs conversion to maintain per-channel throughput. Use Value: 1µs minimum inter-conversion delay enables ≥200kSPS aggregate rate across 16 channels. |
Use Scenario: Portable medical ECG monitor powered by single Li-ion cell with 5V boost converter. IC Role / Device Role / Timing Role: Unipolar 0V–5V ADC eliminating negative supply generation and simplifying power tree. Use Value: Internal 2.42V reference and 5V-only operation reduce component count by ≥3 vs dual-rail alternatives. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 12-bit sampling ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7572KNZ | Requires ±15V supplies; –5.25V reference; slower 10µs conversion; no on-chip S/H. | Legacy designs with existing dual-rail supplies and socket footprint; lower speed tolerance. | Select only if maintaining legacy AD7572 hardware; LTC1272-5ACSW#PBF offers superior speed, integration, and supply simplicity. |
| MAX11200EEE+ | 24-bit delta-sigma ADC; 10SPS–1kSPS; differential inputs; internal PGA; SPI interface. | Ultra-high-resolution, low-speed sensor measurement (e.g., strain gauges); not suitable for 250kHz sampling. | Choose for precision DC/low-frequency measurements; LTC1272-5ACSW#PBF remains optimal for bandwidth-critical applications. |
Compared with AD7572KNZ, LTC1272-5ACSW#PBF reduces supply count, cuts conversion time by >70%, and integrates S/H and reference - enabling smaller PCB area and faster loop response. Versus MAX11200EEE+, it trades resolution for 250× higher throughput, making it suitable for real-time waveform capture rather than static sensing.
Availability
LTC1272-5ACSW#PBF is available at Aetrix Electronics and suitable for high-speed data acquisition, digital signal processing, and single-supply embedded systems requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LTC1272-5ACSW#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 LTC1272-5ACSW#PBF belongs to ADI's legacy Linear Technology precision data conversion product line, designed specifically for high-speed, single-supply, pin-compatible upgrades to industry-standard ADCs like the AD7572.
FAQ
What is the maximum sampling rate achievable with the LTC1272-5ACSW#PBF?
The LTC1272-5ACSW#PBF achieves up to 250kHz sampling rate, enabled by its 3µs conversion time and 1µs minimum inter-conversion delay. This rate is confirmed under fCLK = 4MHz, VDD = 5V, and TA = 25°C conditions. At full temperature range (0°C to 70°C), sustained 250kHz operation requires careful thermal management due to θJA = 130°C/W in the SO wide package.
Can the LTC1272-5ACSW#PBF replace the AD7572 without PCB changes?
Yes - the LTC1272-5ACSW#PBF is a direct pin-compatible replacement for the AD7572 in 24-pin SO wide sockets, but requires reversing the polarity of the VREF bypass capacitor (10µF tantalum) and allowing ≥1µs between conversions. Pin 23 (NC on LTC1272-5ACSW#PBF) remains unconnected, eliminating the AD7572's –15V supply requirement.
What is the purpose of the HBEN pin on the LTC1272-5ACSW#PBF?
The HBEN (High Byte Enable) pin on the LTC1272-5ACSW#PBF controls data bus multiplexing: when LOW, all 12 bits (DB11–DB0) appear on D11–D0/8; when HIGH, only DB11–DB8 appear on D11–D8 and D7–D4 are forced LOW. This enables efficient interfacing with 8-bit microprocessors using two sequential reads, without external latches or logic.
Does the LTC1272-5ACSW#PBF require an external clock source?
No - the LTC1272-5ACSW#PBF supports both external clock input (TTL/CMOS compatible, 4MHz typical) and internal crystal oscillator configuration. A 4MHz crystal or ceramic resonator can be connected between CLK IN (pin 17) and CLK OUT (pin 18); omitting the crystal allows use of an external clock, with CLK OUT providing an inverted copy for synchronization.
How does the internal reference of the LTC1272-5ACSW#PBF differ from the AD7572's reference?
The LTC1272-5ACSW#PBF provides a +2.42V internal reference (±1% initial accuracy, 25ppm/°C tempco), whereas the AD7572 uses a –5.25V reference. This positive reference enables true single-supply operation and requires reversal of the VREF bypass capacitor polarity when retrofitting into AD7572 sockets - a key hardware change for drop-in compatibility.
LTC1272-5ACSW#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 24-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Number of Bits:
- 12
- Sampling Rate (Per Second):
- 250k
- 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:
- Internal
- Voltage - Supply, Analog:
- 5V
- Voltage - Supply, Digital:
- 5V
- Features:
- -
- Operating Temperature:
- 0°C ~ 70°C
- Supplier Device Package:
- 24-SOIC
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC1272-5ACSW#PBF FAQ
1.How can I place an order for LTC1272-5ACSW#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1272-5ACSW#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 LTC1272-5ACSW#PBF reliable?
The price and inventory of LTC1272-5ACSW#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1272-5ACSW#PBF is usually 5 days.
3.What payment methods are accepted for LTC1272-5ACSW#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1272-5ACSW#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1272-5ACSW#PBF?
LTC1272-5ACSW#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1272-5ACSW#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 LTC1272-5ACSW#PBF?
For technical support, including LTC1272-5ACSW#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1272-5ACSW#PBF requirements.
6.How does Aetrix verify that LTC1272-5ACSW#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1272-5ACSW#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 LTC1272-5ACSW#PBF meets industry standards.
7.What is the process for return or replacement of LTC1272-5ACSW#PBF?
All LTC1272-5ACSW#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1272-5ACSW#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 LTC1272-5ACSW#PBF part is unused and in its original packaging.
Return procedure for LTC1272-5ACSW#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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