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Analog Devices Inc. LTC1275ACSW#PBF
- Part No.:
- LTC1275ACSW#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 24-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
LTC1275ACSW#PBF.pdf
- Description:
- IC ADC 12BIT SAR 24SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,175
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Product details
Overview
LTC1275ACSW#PBF from Analog Devices (formerly Linear Technology) is a 12-bit, 300ksps successive-approximation ADC designed for ±2.5V bipolar input operation with internal 2.42V reference, 75mW typical power dissipation, and ±1/2LSB INL max at 0°C to 70°C. It integrates sample-and-hold, precision reference, and synchronized internal clock, enabling direct interface to microprocessors and DSPs in high-speed data acquisition systems.
For engineers reviewing the LTC1275ACSW#PBF datasheet, LTC1275ACSW#PBF pinout, LTC1275ACSW#PBF application, or LTC1275ACSW#PBF equivalent, key selection criteria include its ±2.5V input range, 24-pin SO Wide package, 70dB S/(N+D) at Nyquist, 2.7µs conversion time, and HBEN-controlled 8/12-bit parallel output mode - all critical for precision analog-to-digital conversion in signal processing and spectrum analysis.
Technical Context
The LTC1275ACSW#PBF implements a 12-bit capacitive DAC-based successive approximation register (SAR) architecture with integrated sample-and-hold and factory-trimmed internal clock. Its bipolar ±2.5V input range is supported by dual ±5V supplies (VDD = +5V, VSS = –5V), and it uses a 2.42V bandgap reference with ±5ppm/°C tempco over temperature.
Digital interface operates via CS, RD, and HBEN control lines to manage conversion start and 12-bit parallel output multiplexing (D11–D0/8). The device features three-state outputs, BUSY status flag, and ESD protection on all pins - optimized for noise-sensitive, high-throughput embedded measurement applications.
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 | 300ksps maximum - supports real-time capture of signals up to 150kHz Nyquist bandwidth. |
| Analog Input Range | ±2.5V bipolar - requires ±5V supplies and enables full-scale differential measurement without external level-shifting. |
| INL / DNL | ±1/2LSB max integral nonlinearity, ±3/4LSB max differential nonlinearity - ensures <0.012% absolute accuracy across full code range. |
| S/(N + D) | 70dB at 150kHz Nyquist input - delivers ~11.3 effective bits for high-fidelity spectral analysis. |
| Power Dissipation | 75mW typical at 300ksps - enables low-thermal-load integration in dense PCB layouts. |
| Reference Voltage | 2.42V ±0.02V output with ±5ppm/°C tempco - eliminates need for external reference in most industrial-grade designs. |
| Conversion Time | 2.7µs maximum - defines minimum inter-conversion interval and supports tight timing control in deterministic systems. |
Pinout & Package
Package: 24-lead plastic SO Wide (SW), RoHS-compliant, lead-free (PBF), 0.300" wide body, JEDEC MS-013AC.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AIN (1) | Analog Input | Accepts ±2.5V differential input referenced to AGND; high-impedance (>1GΩ) with 50pF sampling capacitance. |
| VREF (2) | Reference Output | 2.42V precision voltage source; must be bypassed with 10µF + 0.1µF to AGND for optimal noise performance. |
| 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 | Three-state MSB-aligned outputs; active when CS and RD are low; driven during read cycle only. |
| DGND (12) | Digital Ground | Ground reference for digital I/O; isolation from AGND reduces switching noise injection into analog path. |
| D3/11–D0/8 (13–16) | Data Outputs | Lower byte outputs; multiplexed with upper byte via HBEN; enable 8-bit bus interface compatibility. |
| NC (17, 18) | No Connection | Unbonded pins; must remain unconnected per design - no routing or grounding allowed. |
| HBEN (19) | High Byte Enable | Controls 12-bit vs. 8-bit output mode; disables conversion when HIGH - used for synchronization and bus arbitration. |
| RD (20) | Read Input | Active-low signal that initiates conversion when CS and HBEN are low; also enables output drivers. |
| CS (21) | Chip Select | Active-low enable for RD and HBEN logic; prevents spurious conversions during bus contention. |
| BUSY (22) | Status Output | Active-low open-drain flag indicating conversion in progress; used for polling or interrupt-driven timing. |
| VSS (23) | Negative Supply | –5V supply rail for bipolar operation; must be bypassed with 0.1µF ceramic to AGND. |
| VDD (24) | Positive Supply | +5V supply rail; bypassed with 10µF tantalum + 0.1µF ceramic to AGND to suppress supply ripple. |
Key Features
| Feature | Design Value |
|---|---|
| Internal synchronized clock | Eliminates external clock source and associated jitter/noise; auto-synchronizes to each RD command for deterministic timing. |
| On-chip 25ppm/°C reference | Factory-trimmed 2.42V bandgap reference with curvature correction - achieves ±0.02V accuracy and stable full-scale drift over 0°C to 70°C. |
| High-impedance analog input | ±1µA leakage current and 50pF acquisition capacitance - allows direct connection to high-Z sensors or op-amp buffers without gain error. |
| ESD protection on all pins | Withstands >2kV HBM per JESD22-A114 - enhances robustness in manufacturing, test, and field-deployed instrumentation. |
| Parallel 12-bit interface with HBEN | Supports both full 12-bit (D11–D0) and byte-multiplexed (D7–D0 + D11–D8) reads - simplifies integration with 8-bit microcontrollers and FIFOs. |
| 600ns sample-and-hold acquisition time | Enables accurate sampling of fast-rising signals with minimal settling delay - compatible with op-amps like LT1220 and LT1224. |
Applications
| Industrial Process Monitoring | Audio Signal Digitization |
|---|---|
Use Scenario: Continuous monitoring of ±10V sensor outputs (e.g., strain gauges, RTDs) scaled to ±2.5V range using precision resistive dividers. IC Role / Device Role / Timing Role: Primary A/D converter capturing 300k samples/sec with 70dB SNDR for real-time FFT-based anomaly detection. Use Value: Eliminates external reference and clock components while maintaining ±1/2LSB linearity - reducing BOM count and calibration complexity. | Use Scenario: Digitizing line-level audio (±2.5V peak) for telecom voice codecs or digital mixing consoles requiring low THD. IC Role / Device Role / Timing Role: High-fidelity SAR ADC delivering 77dB THD at Nyquist, synchronized to system clock via RD/CS handshaking. Use Value: Achieves 11.3 ENOB at 30kHz input - sufficient for 16-bit-equivalent dynamic range without oversampling or dithering. |
| Multiplexed Sensor Acquisition | Spectrum Analyzer Front-End |
Use Scenario: Scanning 16-channel thermocouple array using analog multiplexer; each channel sampled at 18.75ksps (300ksps ÷ 16). IC Role / Device Role / Timing Role: Central ADC with BUSY-driven polling and HBEN-controlled byte reads to match multiplexer settling time. Use Value: Internal 600ns acquisition time accommodates <100Ω source impedance - avoids external op-amp buffering per channel. | Use Scenario: Capturing RF IF signals at 70MHz intermediate frequency using undersampling technique with 300ksps rate. IC Role / Device Role / Timing Role: Band-limited digitizer with 4.5MHz full-power bandwidth and low spurious content (<–85dB). Use Value: Maintains 70dB S/(N+D) up to 150kHz - enables clean baseband reconstruction of aliased high-frequency signals. |
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 |
|---|---|---|---|
| ADS7800U | 12-bit, 100ksps, ±5V input, external reference required, 28-pin SOIC | Lower speed and no internal reference - requires additional voltage reference IC and clock source. | Choose for cost-sensitive, lower-throughput systems where board space permits extra components. |
| MAX1166BCPP+ | 12-bit, 250ksps, ±2.5V input, internal reference, 24-pin PDIP/SO | Slightly slower sampling (250ksps vs. 300ksps); same ±2.5V range but higher 100mW power draw. | Prefer when legacy PDIP footprint compatibility is required or when MAXIM's SPI interface is preferred over parallel bus. |
Compared with ADS7800U and MAX1166BCPP+, the LTC1275ACSW#PBF delivers the highest throughput (300ksps) with lowest power (75mW) and fully integrated timing/reference - making it optimal for compact, high-channel-count data loggers where deterministic parallel read timing is essential.
Availability
LTC1275ACSW#PBF is available at Aetrix Electronics and suitable for industrial process monitoring, audio signal digitization, multiplexed sensor acquisition, and spectrum analyzer front-end applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for LTC1275ACSW#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 LTC1275ACSW#PBF belongs to ADI's legacy Linear Technology precision data acquisition product line, engineered specifically for high-speed, low-power, self-contained 12-bit SAR ADC applications in instrumentation and signal processing systems.
FAQ
What is the operating temperature range for the LTC1275ACSW#PBF?
The LTC1275ACSW#PBF is rated for commercial operation from 0°C to 70°C. This AC-grade specification ensures guaranteed performance for INL (±1/2LSB), DNL (±3/4LSB), and S/(N+D) (70dB at Nyquist) across the full temperature range - critical for industrial control and test equipment deployed in non-climate-controlled environments. The SW package has θJA = 130°C/W.
Does the LTC1275ACSW#PBF require an external clock source?
No, the LTC1275ACSW#PBF does not require an external clock source. It features an internally trimmed clock synchronized to each RD command, delivering a fixed 2.7µs conversion time. This eliminates clock distribution noise and simplifies system timing - a key advantage over competing SAR ADCs that mandate precise external clock generation and routing.
How is the 12-bit output accessed on the LTC1275ACSW#PBF?
The LTC1275ACSW#PBF provides 12-bit parallel output via two modes controlled by HBEN. When HBEN is LOW, all 12 bits appear simultaneously on D11–D4 and D3/11–D0/8. When HBEN is HIGH, only the upper byte (D11–D8) is driven on D11–D4, while D3/11–D0/8 hold the lower byte - enabling compatibility with 8-bit data buses without external latching.
Can the internal reference of the LTC1275ACSW#PBF be overdriven for input span adjustment?
Yes, the VREF pin of the LTC1275ACSW#PBF can be overdriven above 2.42V (e.g., with an op-amp like LT1006) to adjust input span and improve temperature drift. Driving VREF to ≥2.45V disables the internal reference; the new reference sets full-scale to ±1.033×VREF(OUT). This feature is supported only on LTC1275 - not recommended for LTC1273 or LTC1276 due to supply rail violation risk.
What are the absolute maximum supply ratings for the LTC1275ACSW#PBF?
The LTC1275ACSW#PBF has absolute maximum ratings of VDD = +12V, VSS = –6V, and total supply voltage (VDD to VSS) ≤ 12V. However, recommended operating conditions specify VDD = +4.75V to +5.25V and VSS = –2.45V to –5.25V. Exceeding these ranges risks permanent damage or degraded linearity, especially near the ±2.5V input limits.
LTC1275ACSW#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):
- 300k
- 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, -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:
- -
LTC1275ACSW#PBF FAQ
1.How can I place an order for LTC1275ACSW#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1275ACSW#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 LTC1275ACSW#PBF reliable?
The price and inventory of LTC1275ACSW#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1275ACSW#PBF is usually 5 days.
3.What payment methods are accepted for LTC1275ACSW#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1275ACSW#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1275ACSW#PBF?
LTC1275ACSW#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1275ACSW#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 LTC1275ACSW#PBF?
For technical support, including LTC1275ACSW#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1275ACSW#PBF requirements.
6.How does Aetrix verify that LTC1275ACSW#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1275ACSW#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 LTC1275ACSW#PBF meets industry standards.
7.What is the process for return or replacement of LTC1275ACSW#PBF?
All LTC1275ACSW#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1275ACSW#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 LTC1275ACSW#PBF part is unused and in its original packaging.
Return procedure for LTC1275ACSW#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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