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Analog Devices Inc. LTC1273ACSW#PBF
- Part No.:
- LTC1273ACSW#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 24-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
LTC1273ACSW#PBF.pdf
- Description:
- IC ADC 12BIT SAR 24SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,571
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Product details
Overview
LTC1273ACSW#PBF from Analog Devices (formerly Linear Technology) is a 12-bit, 300ksps successive-approximation analog-to-digital converter with integrated 2.42V reference, internal synchronized clock, and high-impedance 0V–5V unipolar analog input. It operates from a single 5V supply, dissipates 75mW typical, and delivers ±1/2LSB INL and 70dB S/(N+D) at Nyquist-designed for precision data acquisition in embedded instrumentation and signal conditioning systems.
For engineers reviewing the LTC1273ACSW#PBF datasheet, LTC1273ACSW#PBF pinout, LTC1273ACSW#PBF application, or LTC1273ACSW#PBF equivalent, key selection criteria include unipolar 0V–5V input range, 24-pin SO Wide package compatibility, 2.7µs conversion time, ESD protection on all pins, and support for parallel 8-/12-bit bus interfacing with HBEN-controlled byte multiplexing.
Technical Context
The LTC1273ACSW#PBF implements a 12-bit capacitive DAC-based successive approximation register (SAR) architecture with an integrated sample-and-hold circuit requiring only 600ns acquisition time. Its internal clock is factory-trimmed to guarantee ≤2.7µs conversion time without external timing components.
Digital interface uses active-low CS and RD signals with HBEN enabling 8-bit nibble multiplexing on D3/11–D0/8 pins; BUSY indicates conversion status. The device supports both parallel 12-bit and two-byte read modes, with three-state outputs and separate AGND/DGND planes for noise isolation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit with no missing codes-ensures monotonic transfer function and full-scale fidelity for precision measurement. |
| Sampling Rate | 300ksps maximum-supports real-time capture of signals up to 150kHz Nyquist bandwidth. |
| Analog Input Range | 0V to 5V unipolar-matches standard single-supply sensor and DAC output levels without level-shifting. |
| Reference Voltage | 2.42V ±20mV (±5ppm/°C tempco)-provides stable scaling for absolute accuracy over 0°C–70°C. |
| INL / DNL | ±1/2LSB max integral nonlinearity, ±3/4LSB max differential nonlinearity-guarantees <1 LSB error across full code range. |
| Power Dissipation | 75mW typical at 300ksps-enables thermally constrained designs without forced cooling. |
| S/(N + D) | 70dB at 150kHz Nyquist input-delivers >11.3 effective bits for high-fidelity spectral analysis. |
Pinout & Package
Package: 24-lead plastic SO Wide (SW), 0.300" wide body, RoHS-compliant lead-free finish (#PBF).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AIN (1) | Analog Input | High-impedance node accepting 0V–5V unipolar signals; requires ≤100Ω source resistance for optimal AC performance. |
| VREF (2) | Reference Output | 2.42V buffered reference output; must be decoupled with 10µF + 0.1µF to AGND for low-noise operation. |
| AGND (3) | Analog Ground | Return path for analog circuitry; must be separated from DGND and connected at single point near device. |
| D11–D4 (4–11) | Data Outputs | Three-state MSB-aligned 8-bit parallel outputs; driven when CS and RD are low. |
| DGND (12) | Digital Ground | Return path for digital I/O; isolated from AGND to minimize ground bounce coupling into analog section. |
| D3/11–D0/8 (13–16) | Multiplexed Data Outputs | Low-byte outputs enabled by HBEN; allow 8-bit microprocessor interface without 12-bit bus width. |
| NC (17,18) | No Connection | Unbonded pins-must remain floating; no PCB trace or solder mask required. |
| HBEN (19) | High-Byte Enable | Active-high control that disables conversion start when asserted and selects upper/lower data byte output mode. |
| RD (20) | Read Strobe | Active-low signal initiating conversion when CS and HBEN are low; also enables output drivers. |
| CS (21) | Chip Select | Active-low enable for RD and HBEN inputs; prevents spurious conversions during bus contention. |
| BUSY (22) | Conversion Status | Open-drain output low during conversion; used for handshaking with microcontrollers or FIFOs. |
| NC (23) | No Connection | Not connected internally for LTC1273 variant-no routing or termination needed. |
| VDD (24) | Positive Supply | 5V ±2.5% supply input; requires local 10µF + 0.1µF bypassing to AGND for stable reference and SAR operation. |
Key Features
| Feature | Design Value |
|---|---|
| Internal synchronized clock | Eliminates external clock source and associated jitter/noise; guarantees deterministic 2.7µs conversion time. |
| On-chip 2.42V reference | Reduces BOM count and layout area; ±5ppm/°C drift enables stable measurements across commercial temperature range. |
| High-impedance analog input | Minimizes loading on preceding signal chain-compatible with op amps like LT1190/LT1224 without buffer stages. |
| ESD protection on all pins | Withstands >2kV HBM-enhances robustness during handling and system integration without external TVS diodes. |
| HBEN-controlled byte multiplexing | Enables 8-bit microcontroller interfacing while preserving full 12-bit resolution via two-read sequence. |
Applications
| Industrial Process Monitoring | Medical Instrumentation |
|---|---|
Use Scenario: Continuous voltage monitoring of pressure transducers and RTD signal conditioners in PLC I/O modules. IC Role / Device Role / Timing Role: Precision ADC capturing 0–5V sensor outputs at 100ksps with DC accuracy maintained over temperature. Use Value: ±1/2LSB INL ensures calibrated readings stay within 0.012% FS error-critical for regulatory compliance in industrial automation. | Use Scenario: Digitizing ECG and EEG front-end amplifier outputs in portable diagnostic devices. IC Role / Device Role / Timing Role: Low-noise, low-power ADC acquiring bio-signals with 70dB S/(N+D) at 150Hz bandwidth. Use Value: 75mW power dissipation enables battery-operated 24-hour monitoring without thermal derating or fan cooling. |
| Test & Measurement Equipment | Audio Signal Analysis |
Use Scenario: Embedded digitizer in benchtop oscilloscopes and spectrum analyzers requiring 12-bit resolution at 300ksps. IC Role / Device Role / Timing Role: High-speed sampling ADC feeding FPGA-based FFT engines for real-time spectral display. Use Value: Internal clock synchronization eliminates asynchronous sampling artifacts-improves measurement repeatability in lab-grade instruments. | Use Scenario: Capturing line-level audio signals (0–5V) for digital post-processing in professional audio analyzers. IC Role / Device Role / Timing Role: Unipolar ADC interfaced to DSP via parallel bus for low-latency waveform capture. Use Value: 77dB THD at Nyquist enables clean harmonic analysis of 15kHz tones-meets AES17 audio test standards. |
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, no internal reference-requires external 2.5V ref and level-shifting for 5V logic. | Best suited for low-voltage, space-constrained designs where serial interface reduces pin count. | Select ADS7822U when board area is limited and microcontroller supports SPI; avoid if 0V–5V unipolar input and parallel bus are mandatory. |
| MAX1166BCAP+ | Single 5V supply, internal 4.096V reference, 100ksps max sampling rate-lower speed but tighter gain error (±4 LSB vs ±15 LSB). | Ideal for DC-coupled sensor readout where throughput >100ksps is unnecessary but absolute gain stability is critical. | Choose MAX1166BCAP+ for static or slow-varying measurements needing <0.1% full-scale gain error; not suitable for 300ksps dynamic signal capture. |
Compared with ADS7822U and MAX1166BCAP+, the LTC1273ACSW#PBF uniquely combines 300ksps throughput, integrated 2.42V reference, and native 0V–5V unipolar input-making it optimal for cost-sensitive, high-speed industrial DAQ where parallel bus simplicity and guaranteed timing are essential.
Availability
LTC1273ACSW#PBF is available at Aetrix Electronics and suitable for industrial process monitoring, medical instrumentation, test equipment, and audio signal analysis requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for LTC1273ACSW#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 technologies, serving industrial, automotive, communications, and healthcare markets.
The LTC1273ACSW#PBF belongs to ADI's legacy Linear Technology precision data acquisition product line, engineered specifically for high-speed, low-power, single-supply 12-bit SAR ADC applications demanding integrated references and minimal external components.
FAQ
What is the operating temperature range for the LTC1273ACSW#PBF?
The LTC1273ACSW#PBF is rated for the commercial temperature range of 0°C to 70°C. This is confirmed by the "AC" grade suffix in the part number and specified in the Absolute Maximum Ratings table. The device maintains full DC accuracy-including ±1/2LSB INL and ±3/4LSB DNL-across this entire range when operated within recommended supply conditions (4.95V–5.25V VDD).
Does the LTC1273ACSW#PBF require an external clock source?
No, the LTC1273ACSW#PBF does not require an external clock. It features an internally trimmed, synchronized clock that automatically initiates conversion upon each RD pulse. This eliminates clock distribution noise and simplifies system design-confirmed by the "Internal Synchronized Clock; No Clock Required" feature bullet and 2.7µs guaranteed conversion time specification.
Can the LTC1273ACSW#PBF interface directly with a standard 8-bit microcontroller?
Yes, the LTC1273ACSW#PBF supports direct 8-bit microcontroller interfacing using its HBEN (High Byte Enable) pin. When HBEN is high, D3/11–D0/8 output the lower byte (DB3–DB0), and D11–D4 output the upper byte (DB11–DB8); two consecutive reads reconstruct the full 12-bit result. This capability is explicitly documented in Table 1 and the Functional Block Diagram.
What is the purpose of the VREF pin on the LTC1273ACSW#PBF?
The VREF pin (Pin 2) provides a buffered 2.42V reference output derived from the internal bandgap circuit. It supplies the reference voltage for the ADC's DAC and is available to drive external circuitry up to 1mA. Per the datasheet, it must be decoupled with a 10µF tantalum capacitor in parallel with a 0.1µF ceramic capacitor to AGND to ensure low-noise operation and maintain specified S/(N+D) performance.
Is the LTC1273ACSW#PBF pin-compatible with other members of the LTC1273/LTC1275/LTC1276 family?
Yes, the LTC1273ACSW#PBF shares identical pinout and package (24-lead SW) with LTC1275 and LTC1276 variants. However, functional differences exist: LTC1273 accepts 0V–5V unipolar input on single 5V supply, while LTC1275/LTC1276 require ±5V supplies and accept ±2.5V/±5V bipolar inputs. Pin compatibility enables footprint reuse, but supply and input configuration must be redesigned per variant.
LTC1273ACSW#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
- Voltage - Supply, Digital:
- 5V
- Features:
- -
- Operating Temperature:
- 0°C ~ 70°C
- Supplier Device Package:
- 24-SOIC
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC1273ACSW#PBF FAQ
1.How can I place an order for LTC1273ACSW#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1273ACSW#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 LTC1273ACSW#PBF reliable?
The price and inventory of LTC1273ACSW#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1273ACSW#PBF is usually 5 days.
3.What payment methods are accepted for LTC1273ACSW#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1273ACSW#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1273ACSW#PBF?
LTC1273ACSW#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1273ACSW#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 LTC1273ACSW#PBF?
For technical support, including LTC1273ACSW#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1273ACSW#PBF requirements.
6.How does Aetrix verify that LTC1273ACSW#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1273ACSW#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 LTC1273ACSW#PBF meets industry standards.
7.What is the process for return or replacement of LTC1273ACSW#PBF?
All LTC1273ACSW#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1273ACSW#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 LTC1273ACSW#PBF part is unused and in its original packaging.
Return procedure for LTC1273ACSW#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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