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Analog Devices Inc. LTC1290BISW#PBF
- Part No.:
- LTC1290BISW#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
LTC1290BISW#PBF.pdf
- Description:
- IC DAS/ADC 12BIT 50K 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,542
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Product details
Overview
LTC1290BISW#PBF from Analog Devices (formerly Linear Technology) is a 12-bit, 8-channel serial-output sampling data acquisition system with integrated sample-and-hold, multiplexer, and successive approximation ADC. 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 precise analog front-end digitization with microprocessor serial interface.
For engineers reviewing the LTC1290BISW#PBF datasheet, LTC1290BISW#PBF pinout, LTC1290BISW#PBF application, or LTC1290BISW#PBF equivalent, key selection criteria include guaranteed 12-bit no-missing-codes resolution, software-programmable unipolar/bipolar mode, MSB/LSB-first data sequencing, 12µs max conversion time over temperature, and compatibility with MICROWIRE/SPI-style four-wire serial interfaces.
Technical Context
The LTC1290BISW#PBF implements an LTCMOS switched-capacitor SAR architecture with on-chip 8:1 analog multiplexer and track-and-hold for all single-ended channels. Its serial interface uses independent ACLK (for conversion timing) and SCLK (for data transfer), enabling asynchronous control of sampling and communication.
It supports configurable input topology per channel-four differential pairs or eight single-ended inputs referenced to COM-with programmable word length (8/12/16 bits), power shutdown via WL1/WL0 bits, and deglitched CS input that requires two ACLK falling edges for recognition to suppress noise-induced spurious conversions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit unipolar or 11-bit + sign bipolar; guarantees no missing codes across full range. |
| Input Channels | 8 analog inputs (CH0–CH7); configurable as four differential pairs or eight single-ended with COM reference. |
| Throughput Rate | 50kHz maximum; enables 20µs minimum cycle time for real-time sensor sampling. |
| Conversion Time | 13µs maximum over full temperature range; ensures deterministic timing for closed-loop control. |
| Supply Current | 6.0mA typical at VCC = 5V; drops to 5–15µA in power shutdown mode for battery-sensitive designs. |
| Reference Range | ±5V common-mode input range; supports rail-to-rail operation with external 5V reference or internal scaling. |
| Operating Temp | –40°C to +85°C (Industrial grade 'I' suffix); validated for extended environmental reliability. |
Pinout & Package
Package: 20-lead plastic SO wide (SW), RoHS-compliant, surface-mount, 7.6mm × 12.8mm body, 1.27mm pitch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CH0–CH7 (Pins 1–8) | Analog Input Channels | Eight configurable analog inputs; support single-ended (vs. COM) or differential (pairwise) acquisition. |
| COM (Pin 9) | Common Reference | Zero-reference node for all single-ended measurements; must be low-noise and tied to analog ground plane. |
| DGND (Pin 10) | Digital Ground | Return path for internal logic; separate from AGND to prevent digital noise coupling into analog path. |
| AGND (Pin 11) | Analog Ground | Primary analog reference return; requires star-point connection to minimize offset drift and noise. |
| V– (Pin 12) | Negative Supply | Supports bipolar operation down to –6V; tied to ground in single-supply 0V–5V configurations. |
| REF+, REF– (Pins 13–14) | Reference Inputs | Accept external 5V reference or internal scaling; diode-clamped to V– and VCC for overvoltage protection. |
| CS (Pin 15) | Chip Select | Active-low enable; includes deglitching circuit requiring two ACLK falling edges before response. |
| DOUT (Pin 16) | Serial Data Output | Three-state output; goes Hi-Z when CS high; outputs conversion result LSB-first or MSB-first per configuration. |
| DIN (Pin 17) | Serial Data Input | Receives 8-bit configuration word (MUX address, UNI, MSBF, WL1/WL0) on first eight SCLK rising edges. |
| SCLK (Pin 18) | Shift Clock | Synchronizes serial I/O; data latched on rising edge, shifted out on falling edge (full-duplex). |
| ACLK (Pin 19) | A/D Conversion Clock | Independent clock controlling SAR conversion timing; min 15kHz at 25°C, ≥125kHz at 85°C recommended. |
| VCC (Pin 20) | Positive Supply | 4.5V to 5.5V operation; requires local 1µF+ bypass capacitor to AGND for stable reference and sampling. |
Key Features
| Feature | Design Value |
|---|---|
| Software-configurable input mode | Select unipolar/bipolar, single-ended/differential, and MSB/LSB-first output dynamically via serial command. |
| Integrated sample-and-hold | On-chip S/H eliminates need for external hold capacitor; supports 0.02% acquisition in ≤10µs with 1kΩ source. |
| Four-wire serial interface | Direct hardware compatibility with MICROWIRE, SPI, and parallel-port bit-banged MPU interfaces-no glue logic required. |
| Power shutdown mode | Reduces ICC to <15µA by setting WL1=0/WL0=1; resumes conversion automatically on next CS assertion. |
| Overvoltage protected inputs | ±15V fault tolerance on any channel (with current limiting); prevents damage during sensor disconnect or ESD events. |
Applications
| Industrial Sensor Monitoring | Automotive Battery Management |
|---|---|
Use Scenario: Continuous voltage/current measurement from multiple thermocouples, RTDs, and pressure transducers in PLC I/O modules. IC Role / Device Role / Timing Role: Central 12-bit data acquisition IC performing synchronized multi-channel sampling with built-in S/H and serial output to host MCU. Use Value: Eliminates external multiplexer and S/H circuitry; reduces BOM count and layout area while maintaining 12-bit linearity (±0.5 LSB INL) across –40°C to +85°C. | Use Scenario: Cell voltage monitoring in 12S Li-ion battery packs with isolated microcontroller communication. IC Role / Device Role / Timing Role: High-accuracy analog front-end digitizing individual cell voltages using differential inputs to reject common-mode noise on long harnesses. Use Value: ±5V common-mode range rejects pack-level noise; 12-bit resolution resolves sub-1mV changes; 50kHz throughput enables fast state-of-charge updates. |
| Medical Patient Monitoring | Test & Measurement Equipment |
Use Scenario: Multi-parameter vital sign acquisition (ECG, SpO₂, respiration) in portable bedside monitors. IC Role / Device Role / Timing Role: Low-power, precision ADC subsystem acquiring conditioned biopotential signals with programmable gain and filtering. Use Value: Power shutdown mode extends battery life; software-selectable bipolar mode accommodates AC-coupled ECG inputs without level-shifting circuitry. | Use Scenario: Modular data loggers capturing vibration, temperature, and strain gauge outputs in field-deployed equipment. IC Role / Device Role / Timing Role: Standalone data acquisition node interfacing to ARM Cortex-M host via SPI, supporting variable word length and flexible timing. Use Value: 16-bit word option provides headroom for oversampling; 12µs conversion time enables high-speed transient capture up to 50kHz. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 12-bit serial-output data acquisition applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS7822U | 12-bit, 200ksps, SPI-only interface, no built-in S/H, requires external reference. | Higher speed but lacks integrated sample-and-hold and differential MUX flexibility. | Choose for higher throughput where external S/H is acceptable and board space allows discrete components. |
| MAX11131ATJ+ | 12-bit, 500ksps, internal reference, SPI interface, no differential MUX, 10-pin µDFN package. | Smaller footprint and higher speed, but limited to single-ended inputs only and no COM-referenced topology. | Choose for space-constrained designs needing faster sampling and internal reference, but not requiring differential channel pairs. |
Compared with ADS7822U and MAX11131ATJ+, the LTC1290BISW#PBF uniquely integrates an 8-channel MUX, sample-and-hold, and flexible differential/single-ended configuration in one SO-20 package-reducing component count and simplifying layout for multi-sensor industrial systems.
Availability
LTC1290BISW#PBF is available at Aetrix Electronics and suitable for industrial automation, automotive battery monitoring, medical instrumentation, and test equipment requiring stable component supply with long-term lifecycle assurance.
Supply support for LTC1290BISW#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, acquired Linear Technology in 2017.
The LTC1290BISW#PBF belongs to ADI's legacy Linear Technology data acquisition product line, designed specifically for cost-sensitive, medium-speed industrial and instrumentation systems requiring integrated signal conditioning and serial microprocessor interfacing.
FAQ
What is the guaranteed resolution and linearity performance of the LTC1290BISW#PBF over temperature?
The LTC1290BISW#PBF guarantees 12-bit resolution with no missing codes across its full operating range. Its integral nonlinearity (INL) is specified at ±0.5 LSB (typical) and ±0.75 LSB (max) over –40°C to +85°C. Offset error is ±1.5 LSB max, and gain error is ±1.0 LSB typical - all tested and characterized for the 'B' grade Industrial temperature version. These parameters ensure consistent accuracy in demanding environments without recalibration.
Does the LTC1290BISW#PBF require an external reference voltage, or can it operate with an internal reference?
The LTC1290BISW#PBF does not include an internal reference; it requires an external reference applied between REF+ and REF– pins. The device supports reference voltages from 1V to 5V, with optimal performance at 5V. Reference current draw is 10–50µA. For systems requiring internal referencing, an external precision reference such as LT1027 or REF5050 must be used - the LTC1290BISW#PBF itself provides no onboard reference generation.
How does the power shutdown feature work on the LTC1290BISW#PBF, and what is the recovery time?
Power shutdown on the LTC1290BISW#PBF is activated by setting WL1=0 and WL0=1 in the DIN configuration word. This reduces supply current to 5–15µA. Recovery occurs automatically on the next CS assertion - no additional command is needed. The first conversion after wake-up completes in the standard tCONV time (≤13µs), and the result appears on DOUT in the subsequent data cycle. No reset sequence or delay is required beyond normal serial timing.
Can the LTC1290BISW#PBF interface directly with an Arduino or Raspberry Pi GPIO without level-shifting?
Yes - the LTC1290BISW#PBF operates at 5V logic levels (VIH = 2.0V min, VOL = 0.4V max at 1.6mA) and is compatible with 5V-tolerant Arduino Uno/Nano GPIOs. For 3.3V Raspberry Pi, level-shifting is required on DIN, CS, and SCLK inputs (since VIH = 2.0V min but VIL = 0.8V max), while DOUT may be safely read via series resistor (3.3V-tolerant input). Direct connection without translation risks unreliable communication on Pi platforms.
What is the maximum source impedance supported for accurate 12-bit acquisition on the LTC1290BISW#PBF?
The LTC1290BISW#PBF supports ≤1kΩ source impedance for full 12-bit accuracy (0.02% acquisition error) at 25°C, as verified in TPC11. At 85°C, thermal leakage increases; for reliable 12-bit performance across temperature, keep source resistance ≤300Ω or increase ACLK frequency to ≥125kHz to reduce S/H droop. External RC filters must use RFILTER ≤10kΩ (per TPC10) to avoid >0.1 LSB full-scale error.
LTC1290BISW#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:
- -40°C ~ 85°C
- Supplier Device Package:
- 20-SO
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC1290BISW#PBF FAQ
1.How can I place an order for LTC1290BISW#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1290BISW#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 LTC1290BISW#PBF reliable?
The price and inventory of LTC1290BISW#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1290BISW#PBF is usually 5 days.
3.What payment methods are accepted for LTC1290BISW#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1290BISW#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1290BISW#PBF?
LTC1290BISW#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1290BISW#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 LTC1290BISW#PBF?
For technical support, including LTC1290BISW#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1290BISW#PBF requirements.
6.How does Aetrix verify that LTC1290BISW#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1290BISW#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 LTC1290BISW#PBF meets industry standards.
7.What is the process for return or replacement of LTC1290BISW#PBF?
All LTC1290BISW#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1290BISW#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 LTC1290BISW#PBF part is unused and in its original packaging.
Return procedure for LTC1290BISW#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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