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Analog Devices Inc. LTC1272-5ACSW#TRPBF
- Part No.:
- LTC1272-5ACSW#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 24-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
LTC1272-5ACSW#TRPBF.pdf
- Description:
- IC ADC 12BIT SAR 24SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,263
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Product details
Overview
LTC1272-5ACSW#TRPBF from Analog Devices (formerly Linear Technology) is a 12-bit, 3µs successive approximation ADC with integrated sample-and-hold and on-chip 2.42V reference. It operates from a single 5V supply, delivers up to 250kHz sampling rate, and maintains ±0.5 LSB integral linearity over 0°C to 70°C - enabling high-speed data acquisition in industrial PLCs and DSP front-ends.
For engineers reviewing the LTC1272-5ACSW#TRPBF datasheet, LTC1272-5ACSW#TRPBF pinout, LTC1272-5ACSW#TRPBF application, or LTC1272-5ACSW#TRPBF equivalent, key selection criteria include unipolar 0V–5V input range compatibility, AD7572-pin-compatible layout reuse, 24-pin SO Wide package thermal performance (θJA = 130°C/W), and 75mW typical power consumption at full throughput.
Technical Context
The LTC1272-5ACSW#TRPBF implements a switched-capacitor SAR architecture with internal 12-bit capacitive DAC and comparator-based bit decision logic synchronized to external or crystal-derived clocking. Its sample-and-hold acquires input in ≤1µs, and conversion completes in 13 clock cycles (4MHz clock for -3 speed grade).
It features dual digital interface modes: parallel 12-bit read (HBEN low) or two-byte 8-bit bus access (HBEN high), with BUSY-driven status signaling and three-state outputs compatible with TTL/CMOS microprocessor buses. The on-chip 25ppm/°C reference eliminates external voltage references while supporting 1mA load current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit with no missing codes - guarantees monotonic transfer function for precision control feedback loops. |
| Conversion Time | 3µs (LTC1272-3 variant) - enables 250kHz sustained sampling for real-time FFT analysis of 10kHz signals. |
| Integral Linearity Error | ±0.5 LSB max (LTC1272-XA grade) - ensures <0.012% full-scale error in sensor digitization without calibration. |
| Reference Output | 2.42V ±1% with 25ppm/°C tempco - provides stable DAC bias and eliminates need for external reference ICs. |
| Supply Current | 30mA max at VDD = 5V - supports low-power embedded systems with tight thermal budgets. |
| Dynamic Performance | S/(N+D) = 72.1dB at 10kHz input - delivers 11.5 effective bits (ENOB) for high-fidelity signal capture. |
| Package | 24-lead plastic SO wide (SW) - offers 130°C/W junction-to-ambient thermal resistance for industrial ambient operation. |
Pinout & Package
Package: 24-lead plastic SO wide (SW), RoHS-compliant, tape-and-reel (TRPBF). Pin pitch: 1.27mm, body width: 7.5mm, thermal pad not present.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AIN (1) | Analog input | Unipolar 0V–5V input node; accepts DC-coupled signals with ≤50pF input capacitance and ≤3.5mA input current. |
| VREF (2) | Reference output | 2.42V bandgap reference source; requires 10µF + 0.1µF decoupling for <100µV noise floor. |
| AGND (3) | Analog ground | Single-point analog return; must be isolated from DGND except at star ground point near pin 3. |
| D11–D4 (4–11) | Data outputs (MSB–D4) | Three-state CMOS outputs; drive 8-bit or 12-bit microprocessor buses with 1.6mA sink capability. |
| DGND (12) | Digital ground | Digital return path; connected separately to AGND only at system-level star ground. |
| D3/11–D0/8 (13–16) | Data outputs (D3–D0 or MSB byte) | Multiplexed outputs: HBEN high routes D11–D8 here; HBEN low routes D3–D0 here. |
| CLK IN (17) | Timing input | Accepts 4MHz TTL/CMOS clock or crystal (with C1/C2); 5ns rise/fall time specified. |
| CLK OUT (18) | Timing output | Inverted CLK IN signal; used for crystal oscillator configuration or clock distribution. |
| HBEN (19) | High-byte enable | Controls data bus multiplexing: LOW = full 12-bit parallel; HIGH = two-byte 8-bit reads. |
| RD (20) | Read strobe | Active-low control that initiates conversion when CS and HBEN are low; enables output drivers. |
| CS (21) | Chip select | Active-low enable for RD/HBEN recognition; required for bus arbitration in multi-device systems. |
| BUSY (22) | Status output | Active-low open-drain signal indicating conversion in progress; used for polling or interrupt generation. |
| NC (23) | No connect | Internally unconnected; accommodates AD7572's –15V pin without modification to PCB layout. |
| VDD (24) | Positive supply | 5V ±5% single supply; powers analog and digital sections; 6V absolute maximum rating. |
Key Features
| Feature | Design Value |
|---|---|
| AD7572 pin-compatible footprint | Enables drop-in replacement in legacy designs without PCB rework - NC pin (23) replaces AD7572's negative supply pin. |
| On-chip sample-and-hold | Eliminates external S/H circuitry and reduces board space; 0.45–1µs acquisition time supports 250kHz sampling. |
| Single 5V supply operation | Removes need for dual-rail supplies and associated regulators, simplifying power design and reducing BOM cost. |
| ESD protection on all pins | Withstands >2kV HBM per JEDEC JS-001 - improves robustness during handling and system integration. |
| Two data interface modes | Supports both 8-bit (HBEN high) and 16-bit (HBEN low) microprocessors without external glue logic. |
Applications
| Industrial Data Acquisition | DSP Front-End |
|---|---|
Use Scenario: High-channel-count PLC analog input modules acquiring temperature, pressure, and flow sensor signals at 100+ kHz aggregate rates. IC Role / Device Role / Timing Role: Primary sampling ADC providing 12-bit resolution and 250kHz throughput per channel with deterministic BUSY-driven timing. Use Value: Enables real-time closed-loop control with sub-microsecond latency and <0.012% full-scale linearity error across operating temperature. |
Use Scenario: Digitizing audio or vibration signals for FFT-based spectral analysis in predictive maintenance edge devices. IC Role / Device Role / Timing Role: High-SNR front-end ADC delivering 72.1dB S/(N+D) at 10kHz input, synchronized to DSP clock via CLK IN/CLK OUT. Use Value: Achieves 11.5 ENOBs at 20kHz, allowing accurate harmonic detection up to 120kHz without external anti-alias filtering. |
| Single-Supply Instrumentation | Legacy System Upgrade |
Use Scenario: Portable multimeters and handheld oscilloscopes requiring compact, battery-efficient 12-bit digitization with no negative rail. IC Role / Device Role / Timing Role: Core ADC operating from single Li-ion cell (via 5V LDO), using internal 2.42V reference for ratio-metric accuracy. Use Value: Reduces component count by eliminating external reference and negative supply, cutting PCB area by ≥30% vs. AD7572-based designs. |
Use Scenario: Retrofitting aging test equipment originally designed for AD7572 to extend service life and improve performance. IC Role / Device Role / Timing Role: Pin-identical functional upgrade replacing AD7572 with faster conversion (3µs vs. 8µs), integrated S/H, and single-supply operation. Use Value: Doubles sampling rate and removes external S/H IC while maintaining identical socket footprint and control timing. |
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 | 8µs conversion time, requires ±5V/–15V dual supply, –5.25V reference output, no on-chip S/H. | Legacy industrial systems with existing dual-supply infrastructure and mechanical socket constraints. | Select only if backward compatibility with original AD7572 layout and timing is mandatory; higher power and lower speed. |
| MAX1113ECPP+ | 3µs conversion, 5V single supply, but 28-pin SSOP package, no AD7572 pinout, 2.048V reference. | New designs prioritizing modern packaging and extended temperature range (–40°C to +85°C). | Choose for new layouts where pin compatibility is unnecessary and wider temp range or smaller footprint is critical. |
Compared with AD7572KNZ and MAX1113ECPP+, the LTC1272-5ACSW#TRPBF uniquely combines AD7572 pinout compatibility, single 5V operation, integrated S/H, and 3µs speed - making it the only direct upgrade path for legacy systems needing performance enhancement without board redesign.
Availability
LTC1272-5ACSW#TRPBF is available at Aetrix Electronics and suitable for industrial data acquisition, DSP front-end, single-supply instrumentation, and legacy system upgrade applications requiring stable component supply and long-term lifecycle support.
Supply support for LTC1272-5ACSW#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 semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LTC1272-5ACSW#TRPBF belongs to ADI's legacy Linear Technology precision data converter product line, engineered specifically for high-speed, single-supply, pin-compatible upgrades of industry-standard ADCs in industrial control and test equipment.
FAQ
What is the maximum sampling rate supported by the LTC1272-5ACSW#TRPBF?
The LTC1272-5ACSW#TRPBF supports up to 250kHz sampling rate when operated with its 4MHz clock input (LTC1272-3 speed grade). This is achieved with 3µs conversion time and ≤1µs inter-conversion delay, enabling real-time capture of signals up to 125kHz Nyquist frequency. The LTC1272-5ACSW#TRPBF datasheet confirms this under Dynamic Accuracy specifications with fS = 250kHz.
Does the LTC1272-5ACSW#TRPBF require an external reference voltage?
No, the LTC1272-5ACSW#TRPBF does not require an external reference voltage. It integrates a factory-trimmed 2.42V ±1% bandgap reference with 25ppm/°C tempco, available at Pin 2 (VREF). This reference drives the internal DAC and can source up to 1mA for external decoupling - eliminating need for external reference ICs in most applications.
Can the LTC1272-5ACSW#TRPBF replace the AD7572 in an existing PCB layout?
Yes, the LTC1272-5ACSW#TRPBF is pin-compatible with the AD7572 and can plug into the same socket. Key adaptations required: reverse polarity of the VREF bypass capacitor (due to +2.42V vs. –5.25V reference) and leave Pin 23 (NC) unconnected instead of applying –15V. The LTC1272-5ACSW#TRPBF datasheet explicitly validates this drop-in replacement capability.
What digital interface modes does the LTC1272-5ACSW#TRPBF support?
The LTC1272-5ACSW#TRPBF supports two digital interface modes controlled by HBEN: (1) Parallel 12-bit read (HBEN low), where D11–D0/8 output the full conversion result simultaneously; and (2) Two-byte 8-bit read (HBEN high), where D11–D8 output the MSB byte and D3/11–D0/8 output the LSB byte in separate cycles - enabling seamless interfacing with both 8-bit and 16-bit microprocessors.
What is the thermal performance of the LTC1272-5ACSW#TRPBF in its SO wide package?
The LTC1272-5ACSW#TRPBF in the 24-lead plastic SO wide (SW) package has a junction-to-ambient thermal resistance (θJA) of 130°C/W, as specified in the Absolute Maximum Ratings table. This allows continuous operation at up to 70°C ambient when dissipating its typical 75mW power - verified under full 250kHz sampling conditions with VDD = 5V.
LTC1272-5ACSW#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:
- 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#TRPBF FAQ
1.How can I place an order for LTC1272-5ACSW#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1272-5ACSW#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 LTC1272-5ACSW#TRPBF reliable?
The price and inventory of LTC1272-5ACSW#TRPBF 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#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1272-5ACSW#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1272-5ACSW#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1272-5ACSW#TRPBF?
LTC1272-5ACSW#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1272-5ACSW#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 LTC1272-5ACSW#TRPBF?
For technical support, including LTC1272-5ACSW#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1272-5ACSW#TRPBF requirements.
6.How does Aetrix verify that LTC1272-5ACSW#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1272-5ACSW#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 LTC1272-5ACSW#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1272-5ACSW#TRPBF?
All LTC1272-5ACSW#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1272-5ACSW#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 LTC1272-5ACSW#TRPBF part is unused and in its original packaging.
Return procedure for LTC1272-5ACSW#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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