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Analog Devices Inc. LTC1278-5ISW#PBF
- Part No.:
- LTC1278-5ISW#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 24-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
LTC1278-5ISW#PBF.pdf
- Description:
- IC ADC 12BIT SAR 24SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,262
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Product details
Overview
LTC1278-5ISW#PBF from Analog Devices (formerly Linear Technology) is a 12-bit, 500 ksps successive-approximation ADC with integrated sample-and-hold, precision 2.42 V reference, and factory-trimmed internal clock. It operates from single 5 V or ±5 V supplies, delivers ±1 LSB INL/DNL, 70 dB S/(N+D) at 100 kHz, and supports unipolar (0 V to 5 V) and bipolar (±2.5 V) input ranges. It is used in high-speed data acquisition systems requiring low-power, pin-compatible sampling with microprocessor or DSP interfacing.
For engineers reviewing the LTC1278-5ISW#PBF datasheet, LTC1278-5ISW#PBF pinout, LTC1278-5ISW#PBF application, or LTC1278-5ISW#PBF equivalent, key selection criteria include guaranteed no missing codes over temperature, 1.6 µs conversion time, 8.5 mW shutdown power, flexible parallel interface timing (CS/RD/CONVST), and internal reference overdrive capability for span adjustment.
Technical Context
The LTC1278-5ISW#PBF implements a 12-bit capacitive DAC-based successive approximation architecture with a dedicated 200 ns acquisition phase and 1.6 µs conversion time. Its internal clock is synchronized to each CONVST falling edge, eliminating asynchronous clock noise and removing external clock routing requirements.
It features separate CS, RD, and CONVST control lines enabling direct memory-mapped interfacing with microprocessors and FIFOs, while BUSY provides real-time conversion status. The analog input exhibits high impedance (±1 µA leakage) and low capacitance (5 pF in hold mode), supporting clean signal acquisition without external buffering in many applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit with guaranteed no missing codes over full temperature range |
| Sampling Rate | 500 ksps maximum throughput - enables real-time digitization of signals up to 250 kHz Nyquist bandwidth |
| INL / DNL | ±1 LSB max - ensures monotonicity and accurate code transitions across full scale |
| S/(N + D) | 70 dB min at 100 kHz input - supports >11.3 ENOB for precision measurement applications |
| Power Dissipation | 75 mW typical at 500 ksps; drops to 8.5 mW in shutdown - enables thermal management in dense PCB layouts |
| Reference Output | 2.42 V ±20 mV, ±10 ppm/°C tempco - provides stable scaling for unipolar/bipolar modes without external reference |
| Supply Range | Unipolar: AVDD = DVDD = 4.95 V to 5.25 V; Bipolar: AVDD = 4.75–5.25 V, VSS = –2.45 to –5.25 V - defines safe operating window for rail-to-rail input compliance |
Pinout & Package
Package: 24-lead plastic SO wide (SW), 0.300-inch body width, RoHS-compliant lead-free finish (#PBF).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AIN (1) | Analog Input | Accepts 0 V to 5 V (unipolar) or ±2.5 V (bipolar); high-Z, 5 pF hold-mode capacitance minimizes drive burden |
| VREF (2) | Reference Output | 2.42 V bandgap reference; can be overdriven externally ≥2.45 V for bipolar span adjustment |
| AGND (3) | Analog Ground | Single-point analog return; must be isolated from DGND except at package substrate or star ground |
| D11–D4 (4–11) | Data Outputs (MSB–D4) | Three-state parallel outputs; active when CS = LOW and RD = LOW; MSB-first format |
| DGND (12) | Digital Ground | Digital return path; connected to AGND only at single point to prevent noise coupling |
| D3–D0 (13–16) | Data Outputs (D3–LSB) | Completes 12-bit parallel bus; same timing and drive strength as D11–D4 |
| DVDD (17) | Digital Supply | 5 V digital rail; tied directly to AVDD to eliminate supply rail mismatch and reduce PSRR errors |
| SHDN (18) | Shutdown Control | Active-low input; powers down analog core in <350 ns wake-up time - ideal for burst-mode acquisition |
| CONVST (19) | Conversion Start | Falling-edge triggered; initiates SAR cycle only when CS = LOW - prevents spurious conversions |
| RD (20) | Read Strobe | Enables output drivers during CS = LOW; controls data access timing (t8 = 50–170 ns depending on grade) |
| CS (21) | Chip Select | Active-low enable for all control inputs; required LOW before CONVST or RD are recognized |
| BUSY (22) | Conversion Status | Active-low open-drain output; indicates conversion in progress - simplifies handshaking with FIFOs/DSPs |
| VSS (23) | Negative Supply | –5 V for bipolar operation; bypassed to AGND with 0.1 µF ceramic - critical for THD performance |
| AVDD (24) | Positive Analog Supply | 5 V analog rail; bypassed with 10 µF tantalum + 0.1 µF ceramic - ensures stable reference and DAC operation |
Key Features
| Feature | Design Value |
|---|---|
| Internal synchronized clock | Eliminates external clock routing and synchronization logic - reduces layout complexity and EMI susceptibility |
| Flexible unipolar/bipolar operation | Single device supports both 0–5 V sensor interfaces and ±2.5 V AC-coupled signal chains without hardware change |
| Instant wake-up from shutdown | 350 ns SHDN↑ to CONVST↓ delay enables power gating between samples - cuts average power in intermittent acquisition |
| Overdrivable reference pin | VREF accepts external voltage ≥2.45 V - allows precise full-scale adjustment and improved drift performance using LT1019A-2.5 |
| High-impedance analog input | ±1 µA leakage and 5 pF hold-mode capacitance permit direct connection to low-output-impedance op amps (e.g., LT1360) |
Applications
| High-Speed Data Acquisition | Digital Signal Processing |
|---|---|
Use Scenario: Digitizing transient waveforms from oscilloscopes, fault recorders, or automated test equipment at 500 ksps. IC Role / Device Role / Timing Role: Primary sampling ADC with 1.6 µs conversion time and BUSY-driven handshaking to FIFO buffers. Use Value: Guaranteed no missing codes and ±1 LSB linearity ensure waveform fidelity for post-processing FFT analysis. | Use Scenario: Real-time front-end for fixed-point DSPs performing spectral analysis or adaptive filtering on audio/telecom signals. IC Role / Device Role / Timing Role: Parallel-output ADC synchronized via CS/CONVST/RD to match DSP memory-read cycles. Use Value: 70 dB S/(N+D) at 100 kHz and 78 dB THD support >11-bit ENOB for clean baseband signal capture. |
| Multiplexed Data Acquisition Systems | Audio and Telecom Processing |
Use Scenario: Central ADC in multi-channel industrial monitoring systems using analog multiplexers for sensor scanning. IC Role / Device Role / Timing Role: High-Z AIN and fast 200 ns acquisition minimize crosstalk and settling time between channels. Use Value: Low 1 µA input leakage and 45 pF sample-mode capacitance reduce channel-to-channel error in multiplexed topologies. | Use Scenario: Digitizing voice-band or narrowband RF IF signals in telecom base stations or VoIP gateways. IC Role / Device Role / Timing Role: Bipolar ±2.5 V input mode captures AC-coupled signals; internal reference eliminates external component count. Use Value: Full linear bandwidth of 350 kHz (S/(N+D) ≥ 68 dB) supports wide dynamic range within voiceband and sub-IF bands. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 12-bit, medium-speed ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS7822U | 12-bit, 200 ksps, SPI interface, single 5 V supply only; no internal reference or bipolar mode | Best suited for space-constrained, low-pin-count microcontroller interfaces where serial output suffices | Select when board area is critical and system already uses SPI peripherals; avoid if parallel bus or bipolar input needed |
| MAX11200EEE+ | 12-bit, 100 ksps delta-sigma architecture, 2.5 V internal reference, I²C/SPI, ultra-low 0.3 mW power | Ideal for battery-powered precision sensors; lacks speed and bipolar flexibility of LTC1278-5ISW#PBF | Choose for high-resolution DC/low-frequency measurements; not suitable for >100 kHz signal capture |
Compared with ADS7822U and MAX11200EEE+, the LTC1278-5ISW#PBF uniquely combines 500 ksps parallel throughput, bipolar/unipolar dual-mode operation, and an overdrivable 2.42 V reference - making it optimal for mixed-signal systems requiring both speed and interface flexibility without external support components.
Availability
LTC1278-5ISW#PBF is available at Aetrix Electronics and suitable for high-speed data acquisition, digital signal processing, and multiplexed sensor monitoring requiring stable component supply across commercial and industrial temperature grades.
Supply support for LTC1278-5ISW#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 LTC1278-5ISW#PBF belongs to ADI's legacy Linear Technology precision data converter family, designed specifically for applications demanding high-speed, low-power, and easy-to-integrate 12-bit sampling without external clocks or references.
FAQ
What is the maximum sampling rate supported by the LTC1278-5ISW#PBF?
The LTC1278-5ISW#PBF supports a maximum sampling rate of 500 ksps, corresponding to a minimum throughput time of 2.0 µs. This is achieved using its internal factory-trimmed clock and 200 ns acquisition phase. The LTC1278-5ISW#PBF maintains guaranteed AC performance - including 70 dB S/(N+D) at 100 kHz - only when operated at or below this rated speed.
Does the LTC1278-5ISW#PBF require an external clock source?
No, the LTC1278-5ISW#PBF does not require an external clock. It contains a fully integrated, factory-trimmed internal clock that automatically synchronizes to each CONVST falling edge. This eliminates clock routing, jitter sensitivity, and external clock generation circuitry - a key differentiator versus competing ADCs requiring asynchronous clock management.
Can the LTC1278-5ISW#PBF operate in bipolar mode with a single supply?
No, the LTC1278-5ISW#PBF requires dual supplies (AVDD = +5 V, VSS = –5 V) for bipolar ±2.5 V operation. Its analog input stage is not designed for single-supply bipolar input; attempting to use only +5 V with a level-shifted input violates absolute maximum ratings and compromises linearity. The LTC1278-5ISW#PBF datasheet explicitly specifies VSS = –2.45 V to –5.25 V for bipolar mode.
How does the shutdown feature of the LTC1278-5ISW#PBF work, and what is its wake-up time?
The LTC1278-5ISW#PBF enters low-power shutdown when SHDN (Pin 18) is driven low, reducing power dissipation to 8.5 mW. Conversion is inhibited regardless of CONVST state. Wake-up is instantaneous: the device resumes full operation within 350 ns after SHDN returns high, allowing reliable sampling even after brief inactive periods - critical for burst-mode data logging.
Is the internal reference of the LTC1278-5ISW#PBF overdrivable, and what are the voltage limits?
Yes, the VREF pin (Pin 2) of the LTC1278-5ISW#PBF can be overdriven externally to adjust input span in bipolar mode. The reference must be driven to at least 2.45 V to disable the internal 2.42 V reference, and must not exceed 4.8 V to maintain compliance with ±5 V supplies. Driving VREF above 4.8 V risks violating absolute maximum ratings and distorting the transfer function.
LTC1278-5ISW#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):
- 500k
- 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:
- -40°C ~ 85°C
- Supplier Device Package:
- 24-SOIC
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC1278-5ISW#PBF FAQ
1.How can I place an order for LTC1278-5ISW#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1278-5ISW#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 LTC1278-5ISW#PBF reliable?
The price and inventory of LTC1278-5ISW#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1278-5ISW#PBF is usually 5 days.
3.What payment methods are accepted for LTC1278-5ISW#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1278-5ISW#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1278-5ISW#PBF?
LTC1278-5ISW#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1278-5ISW#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 LTC1278-5ISW#PBF?
For technical support, including LTC1278-5ISW#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1278-5ISW#PBF requirements.
6.How does Aetrix verify that LTC1278-5ISW#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1278-5ISW#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 LTC1278-5ISW#PBF meets industry standards.
7.What is the process for return or replacement of LTC1278-5ISW#PBF?
All LTC1278-5ISW#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1278-5ISW#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 LTC1278-5ISW#PBF part is unused and in its original packaging.
Return procedure for LTC1278-5ISW#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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