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Analog Devices Inc. LTC1278-4CSW#TRPBF
- Part No.:
- LTC1278-4CSW#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 24-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
LTC1278-4CSW#TRPBF.pdf
- Description:
- IC ADC 12BIT SAR 24SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,671
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Product details
Overview
LTC1278-4CSW#TRPBF from Analog Devices (formerly Linear Technology) is a 12-bit, 400ksps sampling analog-to-digital converter with internal reference, synchronized clock, and power-down mode. It operates from single 5V or ±5V supplies, delivers ±1LSB INL/DNL, 70dB S/(N+D) at 100kHz, and supports unipolar (0V–5V) or bipolar (±2.5V) input ranges. Used in high-speed data acquisition systems requiring low-power, precision digitization.
For engineers reviewing the LTC1278-4CSW#TRPBF datasheet, LTC1278-4CSW#TRPBF pinout, LTC1278-4CSW#TRPBF application, or LTC1278-4CSW#TRPBF equivalent, this page provides verified technical context, real-world interface timing, confirmed package mapping to 24-pin SO Wide, and validated alternative options for industrial signal conditioning and DSP interfacing.
Technical Context
The LTC1278-4CSW#TRPBF implements a successive approximation register (SAR) architecture with integrated 200ns sample-and-hold, factory-trimmed internal clock (2.0–2.3µs conversion time), and on-chip 2.42V bandgap reference. Its control logic accepts asynchronous CONVST, CS, and RD signals, generating BUSY status and three-state parallel D11–D0 outputs.
It supports two operating modes: unipolar (AVDD = DVDD = 5V, AIN = 0V–5V) and bipolar (AVDD = 5V, VSS = –5V, AIN = ±2.5V), with separate analog (AGND) and digital (DGND) ground pins. Power-down via SHDN reduces dissipation to 8.5mW with 350ns wake-up latency.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit with no missing codes over temperature - guarantees monotonicity and full code coverage in production systems. |
| Sampling Rate | 400ksps maximum - defines sustained throughput for continuous waveform capture without data loss. |
| S/(N + D) | 70dB at 100kHz input - sets usable dynamic range for medium-bandwidth sensor or audio digitization. |
| INL / DNL | ±1LSB - ensures linearity error ≤ 0.024% FS, critical for calibration-critical instrumentation. |
| Power Dissipation | 75mW typical active, 8.5mW shutdown - enables thermal management in dense PCB layouts. |
| Analog Input Range | 0V to 5V (unipolar) or ±2.5V (bipolar) - matches standard sensor output levels and op-amp rails. |
| Reference Output | 2.42V ±20mV, ±10ppm/°C tempco - provides stable scaling for ratiometric measurements without external reference. |
Pinout & Package
Package: 24-lead plastic SO Wide (SW), 0.300" wide body, RoHS-compliant, moisture sensitivity level 3.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AIN (1) | Analog Input | High-impedance node accepting 0V–5V or ±2.5V; requires <200ns settling after sample pulse. |
| VREF (2) | Reference Output | 2.42V buffered reference; can be overdriven externally for span adjustment in bipolar mode. |
| AGND (3) | Analog Ground | Dedicated low-noise return for analog section; must be isolated from DGND except at single point. |
| D11–D4 (4–11) | Data Outputs (MSB first) | Three-state parallel bus; driven only when CS and RD are low; compatible with 5V TTL/CMOS logic. |
| DGND (12) | Digital Ground | Return path for digital I/O; connected to system digital ground, not AGND. |
| AVDD (24) | Analog Positive Supply | +5V supply for analog core; bypassed with 10µF tantalum + 0.1µF ceramic near pin. |
| VSS (23) | Analog Negative Supply | –5V for bipolar operation; bypassed with 0.1µF ceramic; tied to AGND in unipolar mode. |
| CONVST (19) | Conversion Start | Active-low edge-triggered input; initiates SAR cycle only when CS is low. |
| BUSY (22) | Status Output | Active-low open-drain signal indicating conversion in progress; used for handshaking with FIFO/DSP. |
| SHDN (18) | Shutdown Control | Active-low input enabling 8.5mW standby; wake-up latency ≤350ns allows rapid reactivation. |
Key Features
| Feature | Design Value |
|---|---|
| Internal synchronized clock | Eliminates external clock routing and synchronization logic; factory trimmed for 2.0–2.3µs conversion time. |
| Flexible unipolar/bipolar operation | Single device supports both 0V–5V sensor interfaces and ±2.5V AC-coupled signal chains without hardware change. |
| Three-state parallel interface | Direct connection to microprocessor data buses; CS/RD handshaking prevents bus contention during conversion. |
| Low-power shutdown with instant wake-up | Reduces average power in burst-mode acquisition; 350ns wake-up enables sub-microsecond responsiveness. |
| On-chip 2.42V reference with overdrive capability | Removes need for external reference IC; external drive enables precise full-scale adjustment in bipolar applications. |
Applications
| High-Speed Data Acquisition | Digital Signal Processing Interface |
|---|---|
Use Scenario: Real-time monitoring of motor current/voltage waveforms in industrial drives using 12-bit resolution at ≥200ksps. IC Role / Device Role / Timing Role: Primary ADC capturing analog feedback signals; BUSY-driven handshaking with FPGA-based controller. Use Value: 400ksps throughput and ±1LSB linearity ensure accurate torque estimation and fault detection within tight control loops. |
Use Scenario: Digitizing audio or telecom baseband signals for FFT-based spectral analysis in embedded DSP systems. IC Role / Device Role / Timing Role: Front-end ADC feeding parallel data bus to TI C6000 or Analog Devices SHARC processor. Use Value: 70dB S/(N+D) at 100kHz and low aperture jitter (15ns) preserve signal fidelity for narrowband channel analysis. |
| Multiplexed Sensor Systems | Spectrum Analysis Front-End |
Use Scenario: Multi-channel environmental sensing (temperature, pressure, humidity) with shared ADC via analog multiplexer. IC Role / Device Role / Timing Role: Centralized SAR ADC serving up to 8 channels; CONVST-triggered sequential sampling. Use Value: Internal 200ns sample-and-hold and low input leakage (±1µA) minimize crosstalk and settling errors across channels. |
Use Scenario: RF receiver IF-stage digitization for real-time spectrum monitoring in test equipment or comms analyzers. IC Role / Device Role / Timing Role: Medium-speed ADC capturing 0–200kHz IF bandwidth; internal reference ensures stable amplitude scaling. Use Value: Full linear bandwidth of 350kHz (S/(N+D) ≥68dB) supports undersampling of higher-frequency signals with minimal distortion. |
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, 200ksps, no internal reference | Requires external reference and serial interface logic; lower power but slower throughput | Preferred for battery-powered, space-constrained designs where serial interface is acceptable |
| MAX11131ETE+ | 12-bit, 500ksps, internal reference, SPI interface, 2.7V–3.6V supply | Lower voltage operation, SPI-only output, no parallel bus support | Best for modern low-voltage microcontroller systems with SPI peripherals and no parallel bus resources |
Compared with LTC1278-4CSW#TRPBF, ADS7822U offers lower supply flexibility and reduced speed but saves board area via SPI; MAX11131ETE+ provides higher speed and smaller package but lacks parallel interface compatibility and requires 3.3V-only operation.
Availability
LTC1278-4CSW#TRPBF 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 LTC1278-4CSW#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 technologies, serving industrial, automotive, communications, and healthcare markets.
The LTC1278-4CSW#TRPBF belongs to ADI's legacy Linear Technology precision data acquisition portfolio, designed specifically for applications demanding low-power, high-linearity, parallel-interface SAR ADCs with integrated references and robust timing control.
FAQ
What is the maximum sampling rate of the LTC1278-4CSW#TRPBF?
The LTC1278-4CSW#TRPBF has a guaranteed maximum sampling rate of 400ksps, corresponding to a minimum throughput time of 2.5µs (acquisition plus conversion). This is distinct from the faster LTC1278-5 variant (500ksps); the "-4" suffix explicitly denotes the 400ksps speed grade per manufacturer datasheet specifications.
Does the LTC1278-4CSW#TRPBF require an external clock?
No, the LTC1278-4CSW#TRPBF does not require an external clock. It features a fully integrated, factory-trimmed internal clock synchronized to each CONVST command, eliminating clock routing, skew, and synchronization issues common in competing ADCs.
Can the internal reference of the LTC1278-4CSW#TRPBF be overdriven?
Yes, the VREF pin (Pin 2) of the LTC1278-4CSW#TRPBF can be overdriven externally to adjust input span in bipolar mode. The internal 2.42V reference is disabled when VREF is driven to ≥2.45V, allowing precise full-scale calibration using an external DAC or precision voltage source.
What is the power consumption of the LTC1278-4CSW#TRPBF in shutdown mode?
In shutdown mode (SHDN = low), the LTC1278-4CSW#TRPBF draws only 1.7–3.0mA from AVDD, resulting in typical power dissipation of 8.5mW. This enables significant energy savings during idle periods while maintaining sub-microsecond wake-up capability (≤350ns).
Which package type does the LTC1278-4CSW#TRPBF use?
The LTC1278-4CSW#TRPBF uses the 24-lead plastic SO Wide (SW) package, 0.300" body width, with gull-wing leads. This is confirmed by the "CSW" suffix in the part number and documented mechanical drawings in the official Linear Technology datasheet.
LTC1278-4CSW#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:
- Active
- Number of Bits:
- 12
- Sampling Rate (Per Second):
- 400k
- 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:
- External, 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:
- -
LTC1278-4CSW#TRPBF FAQ
1.How can I place an order for LTC1278-4CSW#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1278-4CSW#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 LTC1278-4CSW#TRPBF reliable?
The price and inventory of LTC1278-4CSW#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1278-4CSW#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1278-4CSW#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1278-4CSW#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1278-4CSW#TRPBF?
LTC1278-4CSW#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1278-4CSW#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 LTC1278-4CSW#TRPBF?
For technical support, including LTC1278-4CSW#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1278-4CSW#TRPBF requirements.
6.How does Aetrix verify that LTC1278-4CSW#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1278-4CSW#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 LTC1278-4CSW#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1278-4CSW#TRPBF?
All LTC1278-4CSW#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1278-4CSW#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 LTC1278-4CSW#TRPBF part is unused and in its original packaging.
Return procedure for LTC1278-4CSW#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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