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Analog Devices Inc. LTC1290DCSW#PBF
- Part No.:
- LTC1290DCSW#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
LTC1290DCSW#PBF.pdf
- Description:
- IC DAS/ADC 12BIT 50K 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:641
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Product details
Overview
LTC1290DCSW#PBF from Analog Devices (formerly Linear Technology) is a 12-bit, 8-channel serial-output sampling data acquisition system with integrated sample-and-hold, successive approximation ADC, and configurable analog multiplexer. It supports single-ended or differential inputs, ±5V common-mode range, 50kHz max throughput, and operates from single 5V or dual ±5V supplies. It is used in industrial sensor monitoring systems requiring multi-channel precision analog input conditioning.
For engineers reviewing the LTC1290DCSW#PBF datasheet, LTC1290DCSW#PBF pinout, LTC1290DCSW#PBF application, or LTC1290DCSW#PBF equivalent, key selection considerations include its software-programmable unipolar/bipolar mode, MSB/LSB-first serial output, 8/12/16-bit word length flexibility, on-chip S/H for single-ended channels, and compatibility with MICROWIRE/SPI microprocessor interfaces.
Technical Context
The LTC1290DCSW#PBF implements an LTCMOS switched-capacitor SAR architecture with a built-in 8:1 analog multiplexer supporting mixed single-ended and differential channel configurations. Its serial interface uses independent ACLK (for conversion timing) and SCLK (for data transfer), enabling precise control over sampling, conversion, and output timing.
It features a deglitcher on the CS input requiring two ACLK falling edges for recognition, and supports power shutdown via software command (WL1=0, WL0=1), reducing supply current to ≤15 µA. Conversion results are delayed by one CS cycle relative to the configuration word, and bipolar mode outputs 2's complement coding with sign extension.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit unipolar or 11-bit + sign bipolar - delivers 4096 codes over 0–5V or ±5V full-scale ranges. |
| Input Channels | 8 analog inputs (CH0–CH7) with COM reference - configurable as four differential pairs or eight single-ended inputs relative to COM. |
| Throughput Rate | 50 kHz maximum - enables sub-20 µs per conversion including sampling, allowing real-time monitoring of fast-varying sensor signals. |
| Supply Current | 6.0 mA typical active, ≤15 µA in power shutdown - suitable for low-power embedded DAQ where duty-cycled operation is acceptable. |
| Conversion Time | 13 µs maximum over temperature - ensures deterministic latency for time-critical closed-loop control feedback paths. |
| Analog Input Range | ±5 V common-mode, –0.05 V to VCC + 0.05 V absolute - supports rail-to-rail input with overvoltage tolerance up to ±15 V (with current limiting). |
| Serial Interface | 4-wire synchronous full-duplex (CS, SCLK, DIN, DOUT) - directly compatible with MICROWIRE, SPI, and parallel-port bit-banged implementations. |
Pinout & Package
Package: 20-lead SO Wide (SW), RoHS-compliant lead-free (PBF).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CH0–CH7 (Pins 1–8) | Analog Input Channels | Configurable as single-ended (vs. COM) or differential pairs; on-channel leakage ≤±1 µA ensures minimal signal perturbation during sampling. |
| COM (Pin 9) | Common Reference | Zero-reference point for all single-ended inputs; must be low-noise and tied directly to analog ground plane. |
| DGND (Pin 10) | Digital Ground | Return for internal logic; isolated from AGND to prevent digital noise coupling into analog path. |
| AGND (Pin 11) | Analog Ground | Reference for analog circuitry and REF pins; requires star-point connection to minimize ground shift errors. |
| V– (Pin 12) | Negative Supply | Supports bipolar operation down to –6 V; tied to ground in single-supply 5V systems. |
| REF+, REF– (Pins 13–14) | Reference Inputs | Accept external 0–5 V or ±5 V reference; input diodes clamp at V– –0.3 V and VCC + 0.3 V to protect against overvoltage. |
| CS (Pin 15) | Chip Select | Active-low enable with internal deglitcher; requires ≥2 ACLK cycles after falling edge before valid DIN/DOUT activity. |
| DOUT (Pin 16) | Serial Data Output | Tri-state output; data valid within 130–270 ns after SCLK↓ depending on grade; high-impedance when CS↑. |
| DIN (Pin 17) | Serial Data Input | Receives 8-bit configuration word (MUX address, UNI, MSBF, WL1/WL0); setup/hold times specified at 50 ns. |
| SCLK (Pin 18) | Shift Clock | Controls serial data transfer timing; max 2 MHz frequency; data latched on rising edge, output shifted on falling edge. |
| ACLK (Pin 19) | A/D Conversion Clock | Drives internal SAR and S/H timing; min 15 kHz recommended at 25°C, ≥125 kHz at 85°C to limit S/H droop. |
| VCC (Pin 20) | Positive Supply | 4.5–5.25 V nominal; bypassing with ≥1 µF tantalum + 0.1 µF ceramic to AGND required for stable 12-bit performance. |
Key Features
| Feature | Design Value |
|---|---|
| Software-configurable input mode | Select single-ended or differential per conversion via 4-bit MUX address - enables flexible sensor interfacing without hardware rework. |
| Programmable data format | MSB-first or LSB-first output with 8/12/16-bit word length - simplifies alignment with diverse MCU serial peripherals and memory layouts. |
| Integrated sample-and-hold | On-chip S/H for all single-ended channels - eliminates external hold capacitor and reduces board area/cost in multi-channel systems. |
| Bipolar 2's complement output | Automatic sign extension and coding in bipolar mode - removes need for post-processing in signed arithmetic applications like motor control. |
| Low-power shutdown | Commandable power-down reducing ICC to ≤15 µA - extends battery life in portable DAQ and enables duty-cycled wake-up architectures. |
| Microprocessor interface compatibility | Native support for MICROWIRE, SPI, and parallel-port bit-banged interfaces - eliminates level-shifting or protocol translation ICs. |
Applications
| Industrial Process Monitoring | Automotive Sensor Hub |
|---|---|
Use Scenario: Continuous acquisition of temperature, pressure, and current sensors across 8 PLC I/O modules. IC Role / Device Role / Timing Role: Centralized analog front-end performing synchronized sampling and serial digitization of multiple sensor signals. Use Value: Single-chip integration reduces BOM count and layout complexity while maintaining 12-bit linearity (±0.5 LSB INL) across temperature. |
Use Scenario: Signal conditioning for cabin air quality sensors (CO₂, humidity, VOC) in vehicle infotainment ECUs. IC Role / Device Role / Timing Role: Multi-channel ADC with ±5V common-mode range accepting ratiometric sensor outputs referenced to noisy 5V rail. Use Value: Built-in overvoltage protection (±15V) prevents latch-up during load-dump transients, improving field reliability. |
| Portable Medical Instrumentation | Test & Measurement Equipment |
Use Scenario: Battery-powered ECG front-end acquiring leads I, II, III plus respiration and skin conductance. IC Role / Device Role / Timing Role: Low-power data acquisition subsystem with software-selectable gain and bipolar mode for differential biopotential signals. Use Value: Power shutdown mode draws <15 µA, enabling >100-hour runtime on coin-cell batteries between measurements. |
Use Scenario: Modular benchtop DAQ unit supporting user-configurable input types (thermocouple, RTD, voltage) via front-panel switch. IC Role / Device Role / Timing Role: Reconfigurable ADC core accepting both single-ended and differential inputs per channel group. Use Value: On-the-fly MUX reconfiguration allows dynamic input routing without hardware changes or FPGA logic. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar data acquisition applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS7822U | 12-bit, 200 kSPS, SPI-only interface, no on-chip S/H, single-supply only (2.7–5.25 V) | Lacks differential input support and bipolar mode; requires external S/H for multi-channel hold | Preferred for higher-speed, single-supply systems where differential capability is not required. |
| MAX11131ATJ+ | 12-bit, 500 kSPS, SPI interface, internal reference, ±1 LSB INL, 24-lead TQFN | Higher speed and better linearity but no software-selectable unipolar/bipolar mode or COM-referenced single-ended inputs | Chosen when throughput >50 kSPS or guaranteed ±1 LSB INL over temperature is mandatory. |
Compared with ADS7822U and MAX11131ATJ+, the LTC1290DCSW#PBF uniquely combines software-configurable differential/single-ended topology, bipolar 2's complement output, and integrated S/H in a 20-pin SO package-making it optimal for cost-sensitive, multi-sensor industrial DAQ where flexibility and analog integration outweigh raw speed.
Availability
LTC1290DCSW#PBF is available at Aetrix Electronics and suitable for industrial process monitoring, automotive sensor hubs, portable medical instrumentation, and test & measurement equipment requiring stable component supply and long-term obsolescence management.
Supply support for LTC1290DCSW#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 LTC1290DCSW#PBF belongs to ADI's legacy Linear Technology precision data acquisition product line, designed specifically for embedded systems requiring flexible, low-cost, multi-channel analog input with minimal external components.
FAQ
What is the operating temperature range for the LTC1290DCSW#PBF?
The LTC1290DCSW#PBF is rated for 0°C to 70°C ambient operation (Commercial grade 'D' suffix). This range is validated across all DC specifications including offset error (±1.5 LSB), gain error (±4.0 LSB), and linearity (±0.75 LSB INL). Operation outside this range may degrade accuracy or violate absolute maximum ratings such as V– (–6 V) and junction temperature (110°C).
Does the LTC1290DCSW#PBF require an external reference voltage?
Yes, the LTC1290DCSW#PBF requires an external reference applied between REF+ and REF– pins. It accepts 0–5 V unipolar or ±5 V bipolar references. The device draws ≤50 µA reference current and includes on-chip clamping diodes to protect against overvoltage, but does not contain an internal reference. Using a precision external reference (e.g., LT1027) ensures full 12-bit performance.
How does the power shutdown feature work on the LTC1290DCSW#PBF?
Power shutdown is activated by sending a configuration word with WL1 = 0 and WL0 = 1 on DIN. This reduces supply current to ≤15 µA. The prior conversion result is output as a 10-bit word, so a "dummy" conversion is required before shutdown. The LTC1290DCSW#PBF resumes normal operation upon the next CS↓ or SCLK edge, with no reset sequence needed.
Can the LTC1290DCSW#PBF interface directly with an Arduino or Raspberry Pi?
Yes - the LTC1290DCSW#PBF supports standard 4-wire SPI timing and logic levels (VIL = 0.8 V, VIH = 2.0 V at VCC = 4.75–5.25 V), making it compatible with 5V-tolerant GPIOs on Arduino Uno/Nano and Raspberry Pi Pico (via level-shifter if using 3.3V logic). Software libraries can implement the required 8-bit configuration word and 12-bit read sequence using bit-banged or hardware SPI.
What is the maximum source impedance supported for accurate sampling on the LTC1290DCSW#PBF?
The LTC1290DCSW#PBF specifies a maximum source resistance of 10 kΩ for ≤0.02% acquisition error (typical) with ACLK = 4 MHz and VREF = 5 V. Higher impedances increase S/H settling time and introduce gain/linearity errors; for sources >1 kΩ, external op-amp buffering is recommended to maintain 12-bit accuracy across temperature.
LTC1290DCSW#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Number of Bits:
- 12
- Sampling Rate (Per Second):
- 50k
- Number of Inputs:
- 4, 8
- Input Type:
- Differential, Single Ended
- Data Interface:
- SPI
- Configuration:
- MUX-S/H-ADC
- Ratio - S/H:ADC:
- 1:1
- Number of A/D Converters:
- 1
- Architecture:
- SAR
- Reference Type:
- External
- Voltage - Supply, Analog:
- 5V, ±5V
- Voltage - Supply, Digital:
- 5V, ±5V
- Features:
- -
- Operating Temperature:
- 0°C ~ 70°C
- Supplier Device Package:
- 20-SO
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC1290DCSW#PBF FAQ
1.How can I place an order for LTC1290DCSW#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1290DCSW#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 LTC1290DCSW#PBF reliable?
The price and inventory of LTC1290DCSW#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1290DCSW#PBF is usually 5 days.
3.What payment methods are accepted for LTC1290DCSW#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1290DCSW#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1290DCSW#PBF?
LTC1290DCSW#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1290DCSW#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 LTC1290DCSW#PBF?
For technical support, including LTC1290DCSW#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1290DCSW#PBF requirements.
6.How does Aetrix verify that LTC1290DCSW#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1290DCSW#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 LTC1290DCSW#PBF meets industry standards.
7.What is the process for return or replacement of LTC1290DCSW#PBF?
All LTC1290DCSW#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1290DCSW#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 LTC1290DCSW#PBF part is unused and in its original packaging.
Return procedure for LTC1290DCSW#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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