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Analog Devices Inc. LTC1278-4CSW#PBF
- Part No.:
- LTC1278-4CSW#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 24-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
LTC1278-4CSW#PBF.pdf
- Description:
- IC ADC 12BIT SAR 24SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,969
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Product details
Overview
LTC1278-4CSW#PBF 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. It is used in high-speed data acquisition systems requiring low-power, precision digitization.
For engineers reviewing the LTC1278-4CSW#PBF datasheet, LTC1278-4CSW#PBF pinout, LTC1278-4CSW#PBF application, or LTC1278-4CSW#PBF equivalent, key selection criteria include guaranteed no missing codes over temperature, 2.5µs minimum throughput time, internal 2.42V reference with ±10ppm/°C tempco, and parallel 12-bit interface timing compatibility with FIFOs and DSPs.
Technical Context
The LTC1278-4CSW#PBF employs a successive approximation register (SAR) architecture with integrated sample-and-hold (200ns acquisition), capacitive DAC, and factory-trimmed internal clock. Its control logic accepts asynchronous CONVST, CS, and RD signals to manage conversion start and data readout without external clock synchronization.
It features separate analog (AGND/AVDD/VSS) and digital (DGND/DVDD) supply domains, high-impedance analog input (±1µA leakage), and three-state parallel outputs (D11–D0) with BUSY status signaling. Power-down (SHDN) reduces dissipation to 8.5mW with 350ns wake-up latency.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit with guaranteed no missing codes over full temperature range |
| Sampling Rate | 400ksps maximum - defines real-time bandwidth for continuous signal capture |
| INL / DNL | ±1LSB - ensures monotonicity and ≤0.024% full-scale linearity error |
| S/(N + D) | 70dB at 100kHz - corresponds to ~11.7 effective bits for precision measurement |
| Reference Voltage | 2.42V ±0.02V output - internally trimmed, supports external overdrive ≥2.45V |
| Power Dissipation | 75mW typical active, 8.5mW shutdown - enables thermal management in dense layouts |
| Supply Range | Unipolar: 4.95–5.25V AVDD/DVDD; Bipolar: 4.75–5.25V AVDD, –2.45 to –5.25V VSS |
Pinout & Package
Package: 24-lead plastic SO wide (SW), RoHS-compliant, 7.6mm × 15.4mm body, 1.27mm pitch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AIN (1) | Analog Input | High-impedance node accepting 0V–5V (unipolar) or ±2.5V (bipolar); 45pF capacitance in sample mode |
| VREF (2) | Reference Output | 2.42V bandgap reference; can be overdriven externally for span adjustment |
| AGND (3) | Analog Ground | Single-point return for analog circuitry; must be isolated from DGND except at star point |
| D11–D4 (4–11) | Data Outputs (MSB) | Three-state parallel bus outputs; D11 = MSB, driven only when CS and RD are active low |
| DGND (12) | Digital Ground | Return for DVDD and digital I/O; connected to AGND only at system ground point |
| D3–D0 (13–16) | Data Outputs (LSB) | Completes 12-bit word; D0 = LSB; high-Z when CS high or RD high |
| DVDD (17) | Digital Supply | +5V digital rail; tied directly to AVDD in most designs to minimize supply separation complexity |
| SHDN (18) | Shutdown Control | Active-low input; asserts 350ns wake-up delay before next CONVST edge |
| CONVST (19) | Conversion Start | Falling-edge triggered; initiates SAR cycle only when CS is low |
| RD (20) | Read Enable | Active-low; enables output drivers after BUSY goes high to latch valid data |
| CS (21) | Chip Select | Active-low enable for all control inputs (CONVST, RD); disables outputs when high |
| BUSY (22) | Status Output | Active-low open-drain signal indicating conversion in progress; falls on CONVST↓, rises after data ready |
| VSS (23) | Negative Supply | –5V for bipolar operation; bypassed to AGND with 0.1µF ceramic capacitor |
| AVDD (24) | Positive Analog Supply | +5V analog rail; bypassed to AGND with 10µF tantalum || 0.1µF ceramic |
Key Features
| Feature | Design Value |
|---|---|
| Internal synchronized clock | Factory-trimmed to 2.0–2.3µs total throughput (acquisition + conversion); eliminates external clock routing and skew concerns |
| Flexible input range support | Hardware-selectable unipolar (0V–5V) or bipolar (±2.5V) via supply configuration - no external level-shifting required |
| Low-power shutdown | Reduces current draw to 1.7–3.0mA (IDD) and 0.12–0.30mA (ISS), enabling energy-efficient burst-mode operation |
| Guaranteed monotonicity | No missing codes across 0°C to 70°C - critical for closed-loop control and servo applications where code gaps cause instability |
| High-Z parallel interface | Three-state outputs with 15pF high-Z capacitance and ±10µA leakage - minimizes bus contention and crosstalk in shared-data systems |
Applications
| High-Speed Data Acquisition | Digital Signal Processing |
|---|---|
Use Scenario: Simultaneous multi-channel voltage monitoring in industrial PLC analog input modules with 1ms update cycles. IC Role / Device Role / Timing Role: Primary ADC digitizing sensor outputs; interfaces to FPGA-based DMA controller via parallel bus with BUSY handshaking. Use Value: 400ksps sustained rate enables 12-channel interleaved sampling at >33ksps/channel; ±1LSB linearity preserves calibration integrity across temperature. | Use Scenario: Real-time spectral analysis of audio-band signals in telecom baseband processing units. IC Role / Device Role / Timing Role: Front-end ADC feeding fixed-point DSP; uses RD/CS timing to align samples with FFT frame boundaries. Use Value: 70dB S/(N+D) at 100kHz ensures <0.3% THD in voice-band digitization; internal reference eliminates external component drift. |
| Multiplexed Sensor Systems | Audio and Telecom Processing |
Use Scenario: 16-sensor thermocouple array with cold-junction compensation in test equipment. IC Role / Device Role / Timing Role: Central ADC time-multiplexed across channels using external analog switch; SHDN asserted between conversions. Use Value: 8.5mW shutdown power allows 95% duty-cycle reduction; 350ns wake-up ensures minimal dead time in high-channel-count scanning. | Use Scenario: Digitizing conditioned microphone outputs in VoIP endpoint devices with dynamic range >90dB. IC Role / Device Role / Timing Role: Precision ADC in low-latency audio path; leverages unipolar 0V–5V range matched to op-amp output swing. Use Value: 2.42V internal reference provides stable full-scale without trimming; 74dB THD at Nyquist supports wideband audio fidelity. |
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 single-supply only; SPI interface; 200ksps max; no internal reference | Requires external reference and level-shifting for ±5V systems; better suited for battery-powered portable instruments | Select when serial interface and ultra-low supply voltage are prioritized over parallel throughput and bipolar support |
| MAX11200EEE+ | 24-bit delta-sigma; 1ksps; internal oscillator; 2.5V reference; SPI-only | Orders-of-magnitude higher resolution but 1/400th sampling speed; no parallel interface or bipolar capability | Select for high-precision DC/low-frequency measurements where speed is secondary to noise floor and drift performance |
Compared with ADS7822U and MAX11200EEE+, the LTC1278-4CSW#PBF uniquely balances 400ksps parallel throughput, ±5V bipolar operation, and integrated reference - making it optimal for industrial DAQ and real-time DSP where deterministic timing and supply flexibility are essential.
Availability
LTC1278-4CSW#PBF is available at Aetrix Electronics and suitable for high-speed data acquisition, digital signal processing, multiplexed sensor systems, and audio/telecom processing requiring stable component supply across commercial temperature grades.
Supply support for LTC1278-4CSW#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 LTC1278-4CSW#PBF belongs to ADI's legacy Linear Technology precision data conversion product line, designed specifically for applications demanding low-power, high-speed, and guaranteed monotonic 12-bit digitization without external clocking or reference components.
FAQ
What is the maximum sampling rate supported by the LTC1278-4CSW#PBF?
The LTC1278-4CSW#PBF supports a maximum sampling rate of 400ksps, corresponding to a minimum throughput time of 2.5µs (acquisition + conversion). This is the rated speed grade for the "-4" variant, distinct from the 500ksps LTC1278-5 series. The specification is guaranteed over the 0°C to 70°C commercial temperature range.
Does the LTC1278-4CSW#PBF require an external clock source?
No, the LTC1278-4CSW#PBF does not require an external clock. It integrates a factory-trimmed internal clock synchronized to each CONVST command, eliminating clock routing, jitter sensitivity, and asynchronous timing conflicts common in competing ADCs. This simplifies PCB layout and improves deterministic timing behavior.
Can the LTC1278-4CSW#PBF operate in bipolar mode with ±5V supplies?
Yes, the LTC1278-4CSW#PBF supports true bipolar operation with AVDD = +5V and VSS = –5V, delivering a ±2.5V analog input range. The device guarantees ±1LSB INL/DNL and 70dB S/(N+D) under these conditions. VSS must be bypassed to AGND with a 0.1µF ceramic capacitor per the layout guidelines.
What is the function of the SHDN pin on the LTC1278-4CSW#PBF?
The SHDN (pin 18) is an active-low shutdown control that reduces power dissipation to 8.5mW typical. When asserted, the LTC1278-4CSW#PBF halts conversions and places outputs in high-impedance state. It wakes up in 350ns, allowing rapid reactivation during brief idle intervals without sacrificing system responsiveness.
How is the internal reference of the LTC1278-4CSW#PBF specified?
The LTC1278-4CSW#PBF features a factory-trimmed 2.42V ±0.02V internal reference (VREF pin 2), with ±10ppm/°C tempco and ±0.01LSB/V line regulation. It sources up to 1mA and may be overdriven externally ≥2.45V for bipolar span adjustment - but not recommended in unipolar mode to avoid exceeding supply rails.
LTC1278-4CSW#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):
- 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#PBF FAQ
1.How can I place an order for LTC1278-4CSW#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1278-4CSW#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 LTC1278-4CSW#PBF reliable?
The price and inventory of LTC1278-4CSW#PBF 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#PBF is usually 5 days.
3.What payment methods are accepted for LTC1278-4CSW#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1278-4CSW#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1278-4CSW#PBF?
LTC1278-4CSW#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1278-4CSW#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 LTC1278-4CSW#PBF?
For technical support, including LTC1278-4CSW#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1278-4CSW#PBF requirements.
6.How does Aetrix verify that LTC1278-4CSW#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1278-4CSW#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 LTC1278-4CSW#PBF meets industry standards.
7.What is the process for return or replacement of LTC1278-4CSW#PBF?
All LTC1278-4CSW#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1278-4CSW#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 LTC1278-4CSW#PBF part is unused and in its original packaging.
Return procedure for LTC1278-4CSW#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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