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Analog Devices Inc. LTC1273BCSW#PBF
- Part No.:
- LTC1273BCSW#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 24-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
LTC1273BCSW#PBF.pdf
- Description:
- IC ADC 12BIT SAR 24SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:393
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Product details
Overview
LTC1273BCSW#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 ±3/4LSB DNL max over 0°C to 70°C - used in high-speed data acquisition systems requiring precision timing and low power.
For engineers reviewing the LTC1273BCSW#PBF datasheet, LTC1273BCSW#PBF pinout, LTC1273BCSW#PBF application, or LTC1273BCSW#PBF equivalent, key selection criteria include its 300ksps sampling rate, on-chip 25ppm/°C reference stability, 70dB S/(N+D) at Nyquist, 24-pin SO Wide package compatibility, and parallel 12-bit bus interface with HBEN-controlled byte multiplexing.
Technical Context
The LTC1273BCSW#PBF implements a switched-capacitor SAR architecture with integrated sample-and-hold (600ns acquisition time), 12-bit capacitive DAC, and high-speed comparator. Its internal clock is factory-trimmed for ≤2.7µs conversion time and automatically synchronizes to each CS/RD command, eliminating asynchronous clock noise.
Digital interface uses active-low CS and RD with HBEN for 8-bit/12-bit bus configuration; BUSY indicates conversion status; outputs are three-state with 15pF high-Z capacitance and ±10µA leakage. Analog input features 50pF sample-mode capacitance, ±1µA leakage, and ESD protection on all pins.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit with no missing codes - guarantees monotonic transfer and full-scale fidelity for precision measurement. |
| Sampling Rate | 300ksps maximum - supports real-time capture of signals up to 150kHz Nyquist bandwidth. |
| INL / DNL | ±1/2LSB max INL, ±3/4LSB max DNL (B grade) - ensures accurate code transitions and linearity-critical applications. |
| Reference Voltage | 2.420V ±20mV, 25ppm/°C max tempco - enables stable unipolar 0V–5V conversion without external reference. |
| Power Dissipation | 75mW typical at 300ksps - allows thermal management in dense PCB layouts without forced cooling. |
| S/(N + D) | 70dB at 150kHz input - provides ≥11.3 effective bits for spectral analysis and dynamic signal fidelity. |
| THD | –74dB at 150kHz - minimizes harmonic contamination in audio and telecom processing paths. |
Pinout & Package
Package: 24-lead plastic SO Wide (SW), 0.300" wide body, JEDEC MS-013AC compliant, θJA = 130°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AIN (1) | Analog Input | High-impedance unipolar input (0V to 5V); accepts ≤50mV overdrive beyond VDD per spec. |
| VREF (2) | Reference Output | 2.42V ±20mV buffered reference output; requires 10µF + 0.1µF decoupling to AGND. |
| AGND (3) | Analog Ground | Separate ground return for analog circuitry; must be tied to DGND at single point. |
| D11–D4 (4–11) | Data Outputs | Three-state MSB-aligned parallel outputs; high-Z when CS high or HBEN high (in byte mode). |
| DGND (12) | Digital Ground | Digital return path; connected to AGND externally to minimize noise coupling. |
| D3/11–D0/8 (13–16) | Data Outputs | Lower-byte outputs; multiplexed with upper byte via HBEN control per Table 1. |
| NC (17,18) | No Connection | Unbonded pins; must remain floating - no routing or grounding allowed. |
| HBEN (19) | High-Byte Enable | Active-low control: when HIGH, disables conversion start and outputs upper byte only. |
| RD (20) | Read Input | Active-low strobe that initiates conversion when CS and HBEN are low; enables output drivers. |
| CS (21) | Chip Select | Active-low enable for digital interface; required for RD/HBEN recognition and output drive. |
| BUSY (22) | Status Output | Active-low open-drain flag indicating conversion in progress; drives low for ≤2.7µs. |
| NC (23) | No Connection | Not connected internally for LTC1273 variant - must be left unconnected. |
| VDD (24) | Positive Supply | +4.95V to +5.25V supply; bypassed with 10µF tantalum + 0.1µF ceramic to AGND. |
Key Features
| Feature | Design Value |
|---|---|
| Internal Synchronized Clock | Eliminates external clock source and timing jitter; auto-synchronizes to each RD pulse for deterministic latency. |
| On-Chip 2.42V Reference | 25ppm/°C max drift and ±5ppm/°C line/load regulation - removes need for external reference IC or trimming. |
| High-Impedance Analog Input | 50pF sample-mode capacitance and ±1µA leakage - simplifies driver selection and reduces settling burden. |
| ESD Protection | Protected on all pins per JEDEC JS-001 Class 2 (≥2kV HBM) - improves robustness in handling and system integration. |
| Parallel 12-Bit Bus Interface | HBEN-controlled byte multiplexing and BUSY status - enables direct connection to 8-bit microcontrollers without glue logic. |
Applications
| High-Speed Data Acquisition | Digital Signal Processing |
|---|---|
Use Scenario: Real-time voltage monitoring in industrial PLC I/O modules sampling multiple sensors at 300ksps. IC Role / Device Role / Timing Role: Primary ADC capturing 0V–5V transducer outputs with deterministic 2.7µs conversion latency. Use Value: Integrated reference and clock reduce BOM count by two components while maintaining ±1/2LSB INL across temperature. | Use Scenario: Front-end digitization in portable spectrum analyzers performing FFT-based RF signal analysis. IC Role / Device Role / Timing Role: High-fidelity analog front-end converting baseband signals before DSP core processing. Use Value: 70dB S/(N+D) at 150kHz Nyquist enables >11 ENOB for accurate amplitude and phase reconstruction. |
| Multiplexed Data Acquisition Systems | Audio and Telecom Processing |
Use Scenario: Channelized sensor hub in test equipment switching between 8 thermocouple inputs using external analog MUX. IC Role / Device Role / Timing Role: Shared ADC resource with fast acquisition (600ns) and low input current enabling minimal channel settling delay. Use Value: 50pF analog input capacitance and ±1µA leakage allow use of low-power op-amps like LT1220 without gain error. | Use Scenario: Digitizing voice-band signals in VoIP gateways requiring low THD and wide dynamic range. IC Role / Device Role / Timing Role: Unipolar ADC interfacing directly to anti-alias filter and µP parallel bus. Use Value: –74dB THD at 150kHz and 77dB THD at Nyquist ensure clean harmonic profile for telephony-grade audio. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 12-bit, 300ksps sampling 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 clock. | Lower pin count (8-pin SOIC), but needs external ref, clock, and level-shifting for 5V µP buses. | Choose for space-constrained designs where serial interface and lower power (3.5mW) outweigh parallel bus convenience. |
| MAX11200ETL+ | 24-bit delta-sigma, 1ksps, internal 2.048V ref, SPI - not SAR, much slower, higher resolution. | Targeted at precision DC/low-frequency measurements (e.g., weigh scales), not dynamic signal capture. | Choose only for ultra-high DC accuracy applications; not suitable for 300ksps or Nyquist-limited AC performance. |
Compared with ADS7822U and MAX11200ETL+, the LTC1273BCSW#PBF uniquely combines integrated reference, internal clock, parallel 12-bit bus, and 300ksps throughput in a single 24-pin SOIC - enabling drop-in replacement in legacy µP-based DAQ systems without redesigning timing or reference circuitry.
Availability
LTC1273BCSW#PBF is available at Aetrix Electronics and suitable for high-speed data acquisition, digital signal processing, and multiplexed sensor systems requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LTC1273BCSW#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 LTC1273BCSW#PBF belongs to ADI's legacy Linear Technology precision data conversion product line, designed specifically for embedded systems requiring self-contained, easy-to-use 12-bit ADCs with minimal external components and guaranteed AC/DC performance.
FAQ
What is the operating temperature range for the LTC1273BCSW#PBF?
The LTC1273BCSW#PBF is specified for commercial operation from 0°C to 70°C. This B-grade version meets ±1/2LSB INL and ±3/4LSB DNL maximum over that full range, making it suitable for industrial control panels and benchtop instrumentation where ambient temperatures remain within this envelope. The part uses LTBiCMOS process technology optimized for stability across this interval.
Does the LTC1273BCSW#PBF require an external clock source?
No, the LTC1273BCSW#PBF does not require an external clock. It includes an internally trimmed clock synchronized to each RD command, delivering ≤2.7µs conversion time with no external timing components. This eliminates clock distribution noise and simplifies layout - a key differentiator versus competing SAR ADCs requiring precise external clock generation and routing.
How is the analog input range configured on the LTC1273BCSW#PBF?
The LTC1273BCSW#PBF is factory-configured for unipolar 0V to 5V input range when powered from a single +5V supply. This is fixed by design - unlike the LTC1275/LTC1276 variants, the LTC1273BCSW#PBF has NC on pin 23 (no VSS connection) and supports only 0V–5V operation. Attempting to apply bipolar signals will violate absolute maximum ratings and cause incorrect conversion.
What decoupling is required for the VREF pin of the LTC1273BCSW#PBF?
The VREF pin (pin 2) of the LTC1273BCSW#PBF requires a minimum 10µF tantalum capacitor in parallel with a 0.1µF ceramic capacitor connected to AGND. This dual-capacitor network suppresses both low-frequency drift and high-frequency noise, ensuring the 2.42V reference remains stable during conversion cycles and maintains the specified 25ppm/°C tempco and 70dB S/(N+D) performance.
Can the LTC1273BCSW#PBF interface directly with an 8-bit microcontroller?
Yes, the LTC1273BCSW#PBF can interface directly with an 8-bit microcontroller using its HBEN (High Byte Enable) pin. When HBEN is asserted, the 12-bit result is multiplexed across D7–D0 (pins 13–16) and D11–D8 (pins 4–7), allowing sequential byte reads. Combined with active-low CS and RD controls plus BUSY status, this eliminates need for external latches or address decoding logic in 8-bit systems.
LTC1273BCSW#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:
- -
LTC1273BCSW#PBF FAQ
1.How can I place an order for LTC1273BCSW#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1273BCSW#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 LTC1273BCSW#PBF reliable?
The price and inventory of LTC1273BCSW#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1273BCSW#PBF is usually 5 days.
3.What payment methods are accepted for LTC1273BCSW#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1273BCSW#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1273BCSW#PBF?
LTC1273BCSW#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1273BCSW#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 LTC1273BCSW#PBF?
For technical support, including LTC1273BCSW#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1273BCSW#PBF requirements.
6.How does Aetrix verify that LTC1273BCSW#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1273BCSW#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 LTC1273BCSW#PBF meets industry standards.
7.What is the process for return or replacement of LTC1273BCSW#PBF?
All LTC1273BCSW#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1273BCSW#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 LTC1273BCSW#PBF part is unused and in its original packaging.
Return procedure for LTC1273BCSW#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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