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Analog Devices Inc. LTC1290BCSW#PBF
- Part No.:
- LTC1290BCSW#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
LTC1290BCSW#PBF.pdf
- Description:
- IC DAS/ADC 12BIT 50K 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,894
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Product details
Overview
LTC1290BCSW#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, unipolar/bipolar conversion, and operates from 5V or ±5V supplies. It delivers 50kHz maximum throughput in industrial sensor monitoring systems.
For engineers reviewing the LTC1290BCSW#PBF datasheet, LTC1290BCSW#PBF pinout, LTC1290BCSW#PBF application, or LTC1290BCSW#PBF equivalent, key selection criteria include its 12-bit resolution with no missing codes guaranteed, 13µs max conversion time over temperature, software-programmable word length (8/12/16-bit), MSB/LSB-first serial output, and built-in deglitching on chip select for noise-immune microprocessor interfacing.
Technical Context
The LTC1290BCSW#PBF implements an LTCMOS switched-capacitor SAR architecture with on-chip sample-and-hold for all single-ended channels. Its 8-channel analog MUX supports four differential or eight single-ended input configurations via software-controlled address bits, enabling flexible signal routing without external components.
Serial communication uses a synchronous, full-duplex four-wire interface (CS, SCLK, DIN, DOUT) compatible with MICROWIRE and SPI protocols. It accepts 8-bit configuration words to set unipolar/bipolar mode, MSB/LSB-first output, word length, and power shutdown - with automatic 2's complement coding in bipolar mode.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12 bits with no missing codes guaranteed over full temperature range |
| Conversion Time | Max 13 µs over temperature; enables ≥50 kHz sustained throughput |
| Input Configuration | Software-selectable: 4 differential or 8 single-ended channels; ±5V common-mode range |
| Supply Current | 6.0 mA typical active; 5–15 µA in power shutdown mode (ACLK off) |
| Serial Interface | Full-duplex, 4-wire (CS/SCLK/DIN/DOUT); supports 8/12/16-bit word lengths and MSB/LSB-first output |
| Analog Input Range | Unipolar: 0 V to VREF; Bipolar: ±VREF; VREF = 1.25 V to 5 V |
| Offset Error | ±1.5 LSB max over 0°C to 70°C (B-grade) |
Pinout & Package
Package: 20-lead plastic 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; each supports ±15V overvoltage protection with current limiting |
| COM (Pin 9) | Single-Ended 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; separate from AGND to minimize digital noise coupling into analog path |
| AGND (Pin 11) | Analog Ground | Reference for analog circuitry and reference inputs; requires star-point connection to system analog ground |
| V– (Pin 12) | Negative Supply Rail | Required for bipolar operation (–5V); tied to GND in unipolar 5V-only systems |
| REF+, REF– (Pins 13–14) | Reference Inputs | Accept external reference (1.25–5V); REF– typically tied to AGND or V–; diode-clamped for overvoltage protection |
| CS (Pin 15) | Chip Select | Active-low enable; includes deglitching (ignores pulses <1 ACLK cycle) to prevent spurious conversions |
| DOUT (Pin 16) | Serial Data Output | Three-state output; data valid after tACC (2 ACLK cycles); high-impedance when CS high |
| DIN (Pin 17) | Serial Data Input | Receives 8-bit configuration word on first 8 rising SCLK edges after CS fall |
| SCLK (Pin 18) | Shift Clock | Synchronizes serial I/O; data latched on rising edge, shifted out on falling edge |
| ACLK (Pin 19) | A/D Conversion Clock | Controls SAR timing; min 15 kHz at 25°C, ≥125 kHz recommended at 85°C to limit S/H droop |
| VCC (Pin 20) | Positive Supply | 4.5 V to 5.25 V; requires local 1 µF+ bypass to AGND to maintain PSRR and noise performance |
Key Features
| Feature | Design Value |
|---|---|
| Software-configurable input mode | Selects 4 differential or 8 single-ended channels via DIN command - eliminates external MUX hardware |
| Programmable serial output format | MSB-first or LSB-first + 8/12/16-bit word length - matches native register widths of COP402, MC68HC05, TMS320, and other MPUs |
| Built-in sample-and-hold | Integrated S/H for all single-ended channels - removes need for external hold capacitor and driver op amp |
| Power shutdown mode | Reduces supply current to ≤15 µA (ACLK off) - extends battery life in portable data loggers |
| Noise-immune chip select | Deglitche circuit rejects transients <1 ACLK period - prevents false triggering in electrically noisy industrial environments |
Applications
| Industrial Process Monitoring | Automotive Sensor Data Acquisition |
|---|---|
Use Scenario: Continuous voltage/current measurement from 8 pressure, temperature, and position sensors in PLC-based control cabinets. IC Role / Device Role / Timing Role: Central 12-bit data acquisition IC performing synchronized sampling, digitization, and serial streaming to host MCU via SPI-compatible interface. Use Value: Eliminates discrete op amps, external MUX, and sample-hold circuitry - reduces BOM count by ≥7 components per channel while maintaining ±0.5 LSB INL accuracy. | Use Scenario: Battery-powered vehicle diagnostic tool acquiring analog signals from O2 sensors, throttle position, and coolant temperature across 4 differential pairs. IC Role / Device Role / Timing Role: Low-power, software-configurable ADC with shutdown mode activated between readings to extend operating time on coin-cell battery. Use Value: 5 µA shutdown current and ±15V overvoltage tolerance allow direct connection to automotive harnesses without front-end protection circuitry. |
| Portable Medical Instrumentation | Test & Measurement Equipment |
Use Scenario: Handheld ECG device digitizing 8-lead biopotential signals with selectable gain and common-mode rejection. IC Role / Device Role / Timing Role: Precision 12-bit SAR ADC with differential input capability and ±5V common-mode range supporting instrumentation amplifier outputs. Use Value: On-chip S/H and 13 µs conversion time enable real-time waveform capture at ≥50 kSPS - sufficient for 10 kHz bandwidth clinical applications. | Use Scenario: Benchtop multimeter front-end acquiring DC voltage, resistance, and current measurements across multiple ranges. IC Role / Device Role / Timing Role: Reconfigurable data acquisition subsystem accepting programmable reference voltages (1.25–5V) and supporting both unipolar (0–5V) and bipolar (±5V) input spans. Use Value: Software-selectable 12-bit unipolar or 11-bit+sign bipolar mode allows single hardware design to cover dual-range meter functionality without component changes. |
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 differential MUX, requires external REF | Higher speed but lacks on-chip S/H and flexible input configuration; needs external op amp for differential inputs | Choose for higher throughput where MUX flexibility and integrated S/H are not required |
| MAX1248ACPP+ | 12-bit, 133 kSPS, SPI interface, 8-channel single-ended only, no bipolar mode | Higher speed and lower power (1.5 mA active), but limited to unipolar 0–VREF inputs and no differential capability | Choose for cost-sensitive unipolar-only systems requiring >100 kSPS |
Compared with ADS7822U and MAX1248ACPP+, the LTC1290BCSW#PBF uniquely combines integrated sample-and-hold, software-configurable differential/single-ended MUX, bipolar conversion, and deglitched chip select - making it optimal for noise-prone, multi-sensor industrial and portable instrumentation where hardware simplicity and robustness are prioritized over raw speed.
Availability
LTC1290BCSW#PBF is available at Aetrix Electronics and suitable for industrial process monitoring, automotive diagnostics, portable medical instrumentation, and benchtop test equipment requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LTC1290BCSW#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, formed through the acquisition of Linear Technology in 2017.
The LTC1290BCSW#PBF belongs to ADI's legacy Linear Technology precision data acquisition product line, designed specifically for embedded systems requiring integrated, low-component-count analog front-ends with robust serial interfacing and flexible input configuration.
FAQ
What is the operating temperature range for the LTC1290BCSW#PBF?
The LTC1290BCSW#PBF is rated for 0°C to 70°C ambient operation (B-grade). This is confirmed in the Absolute Maximum Ratings table and Electrical Characteristics section, where parameters like offset error, linearity, and supply current are specified over this range. The 'B' suffix explicitly denotes the commercial temperature grade, distinct from 'I' (–40°C to 85°C) or 'D' (–40°C to 125°C) variants.
Does the LTC1290BCSW#PBF require an external reference voltage?
Yes, the LTC1290BCSW#PBF requires an external reference voltage applied between REF+ and REF– pins. It supports reference voltages from 1.25 V to 5 V, as stated in the Typical Performance Characteristics and Electrical Characteristics tables. The device does not contain an internal reference; accuracy and span directly depend on the stability and noise performance of the external reference source.
Can the LTC1290BCSW#PBF perform true differential measurements across arbitrary channel pairs?
No - the LTC1290BCSW#PBF supports differential measurements only across four predefined adjacent channel pairs: CH0–CH1, CH2–CH3, CH4–CH5, and CH6–CH7. This is explicitly defined in Table 1 (Multiplexer Channel Selection) and Figure 1 of the datasheet. Non-adjacent or cross-pair differential configurations (e.g., CH0–CH3) are not supported by the internal MUX architecture.
How does the power shutdown feature work on the LTC1290BCSW#PBF?
The LTC1290BCSW#PBF enters power shutdown when the WL1/WL0 bits in the DIN configuration word are set to '01'. In this mode, supply current drops to ≤15 µA (ACLK off), but the previous conversion result is output as a 10-bit word. A "dummy" conversion cycle is required before shutdown, and normal operation resumes automatically upon the next CS low or SCLK edge, as detailed in the Applications Information section.
Is the LTC1290BCSW#PBF pin-compatible with other variants like LTC1290CCSW#PBF?
Yes - the LTC1290BCSW#PBF shares identical pinout, package (20-lead SO wide), and electrical interface with all SW-package variants including LTC1290CCSW#PBF and LTC1290DCSW#PBF. Differences are limited to temperature grade (B = 0°C–70°C, C = 0°C–70°C with tighter gain error, D = –40°C–125°C) and AC/DC specifications, not physical or logical connectivity.
LTC1290BCSW#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:
- -
LTC1290BCSW#PBF FAQ
1.How can I place an order for LTC1290BCSW#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1290BCSW#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 LTC1290BCSW#PBF reliable?
The price and inventory of LTC1290BCSW#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1290BCSW#PBF is usually 5 days.
3.What payment methods are accepted for LTC1290BCSW#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1290BCSW#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1290BCSW#PBF?
LTC1290BCSW#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1290BCSW#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 LTC1290BCSW#PBF?
For technical support, including LTC1290BCSW#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1290BCSW#PBF requirements.
6.How does Aetrix verify that LTC1290BCSW#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1290BCSW#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 LTC1290BCSW#PBF meets industry standards.
7.What is the process for return or replacement of LTC1290BCSW#PBF?
All LTC1290BCSW#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1290BCSW#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 LTC1290BCSW#PBF part is unused and in its original packaging.
Return procedure for LTC1290BCSW#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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