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Analog Devices Inc. LTC1290CISW#PBF
- Part No.:
- LTC1290CISW#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
LTC1290CISW#PBF.pdf
- Description:
- IC DAS/ADC 12BIT 50K 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,486
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Product details
Overview
LTC1290CISW#PBF from Analog Devices (acquired Linear Technology) is a 12-bit, 8-channel serial sampling data acquisition system IC 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 signal conditioning and embedded data logging systems requiring precision multichannel analog input.
For engineers reviewing the LTC1290CISW#PBF datasheet, LTC1290CISW#PBF pinout, LTC1290CISW#PBF application, or LTC1290CISW#PBF equivalent, key selection criteria include its 12-bit resolution with no missing codes guaranteed, software-programmable unipolar/bipolar mode, MSB/LSB-first serial output, 12µs max conversion time, and compatibility with MICROWIRE/SPI microprocessor interfaces.
Technical Context
The LTC1290CISW#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 configurations via software-controlled address bits, enabling flexible front-end signal routing without external components.
Serial communication uses a synchronous full-duplex four-wire interface (CS, SCLK, DIN, DOUT) compatible with industry-standard protocols. The device accepts an 8-bit configuration word to set input mode, polarity, data order, word length (8/12/16 bits), and power shutdown - with conversion results delayed by one CS cycle relative to the command.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12 bits with no missing codes guaranteed over full temperature range - ensures monotonicity and accurate digital representation of analog signals. |
| Input Channels | 8 analog inputs (CH0–CH7) configurable as four differential pairs or eight single-ended channels relative to COM - enables mixed-signal acquisition in compact layouts. |
| Conversion Time | Max 13 µs over temperature - supports up to 50 kHz sampling rate for real-time control loop feedback. |
| Supply Current | 6.0 mA typical at VCC = 5V, CS high; drops to 5–15 µA in power shutdown mode - reduces system power in battery-operated or low-duty-cycle applications. |
| Reference Range | ±5V common-mode input range with ±15V overvoltage tolerance per channel (with current limiting) - allows direct connection to industrial transducers without external protection circuitry. |
| Serial Interface | 4-wire synchronous full-duplex with programmable MSB/LSB-first output and 8/12/16-bit word length - simplifies integration with diverse MPUs including COP402 (MICROWIRE) and MC68HC05C4 (SPI). |
| Operating Temperature | –40°C to +85°C (C-grade) - qualified for industrial environments including factory automation and motor control cabinets. |
Pinout & Package
Package: 20-lead plastic SO wide (SW), RoHS-compliant, surface-mount, 7.6 mm × 12.8 mm body, 1.27 mm 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 with ±5V common-mode range. |
| 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 | Ground reference for internal logic and serial interface; separate from AGND to minimize digital noise coupling into analog path. |
| AGND (Pin 11) | Analog Ground | Ground reference for analog circuitry (MUX, S/H, ADC); requires star-point connection to DGND only at single point to avoid ground loops. |
| V– (Pin 12) | Negative Supply Rail | Supports bipolar operation down to –6V; tied to ground in unipolar 5V-only systems. |
| REF+, REF– (Pins 13–14) | Reference Voltage Inputs | Accept external reference (e.g., LT1027) or internal VCC/AGND; define full-scale range and determine LSB size (e.g., 2.44 mV at VREF = 5V). |
| CS (Pin 15) | Chip Select | Active-low enable for serial interface; includes deglitching circuit that ignores pulses shorter than one ACLK cycle to reject noise. |
| DOUT (Pin 16) | Serial Data Output | Three-state output delivering conversion result; transitions from Hi-Z to valid data after two ACLK falling edges post-CS assertion. |
| DIN (Pin 17) | Serial Data Input | Receives 8-bit configuration word defining MUX address, unipolar/bipolar mode, MSB/LSB order, and word length/power-down state. |
| SCLK (Pin 18) | Shift Clock | Synchronizes serial data transfer; data captured on rising edge, transmitted on falling edge - compatible with standard SPI timing. |
| ACLK (Pin 19) | A/D Conversion Clock | Controls internal SAR conversion timing; minimum 15 kHz recommended at 25°C, ≥125 kHz at 85°C to prevent S/H droop-induced errors. |
| VCC (Pin 20) | Positive Supply | 4.5V to 5.5V operation; requires local 1µF+ tantalum bypass to AGND to suppress switching noise affecting ADC accuracy. |
Key Features
| Feature | Design Value |
|---|---|
| Software-configurable input topology | Runtime selection of single-ended (8 channels) or differential (4 pairs) via 4-bit MUX address - eliminates need for external switch matrices in multi-sensor systems. |
| Bipolar/unipolar conversion mode | Single-bit UNI control selects 0V–5V unipolar or ±5V bipolar full-scale range with automatic 2's complement coding in bipolar mode - simplifies signed arithmetic in firmware. |
| Programmable serial output format | MSB-first or LSB-first data sequence and 8/12/16-bit word length controlled by DIN bits - enables seamless alignment with 8-bit, 16-bit, or DSP-oriented processor data paths. |
| Integrated sample-and-hold | On-chip S/H for all single-ended channels with <1 µs acquisition time at 1 kΩ source impedance - removes requirement for external S/H and reduces BOM count. |
| Low-power shutdown mode | Power-down initiated by WL1=0/WL0=1 configuration; ICC reduced to ≤15 µA - extends battery life in portable data recorders between sampling intervals. |
Applications
| Industrial Process Monitoring | Motor Control Feedback |
|---|---|
|
Use Scenario: Continuous voltage/current measurement from multiple pressure, temperature, and flow sensors in PLC-based factory automation systems. IC Role / Device Role / Timing Role: Central 12-bit data acquisition node acquiring synchronized samples across 8 analog inputs with configurable differential rejection of common-mode noise on long sensor cables. Use Value: Eliminates need for discrete op-amp front-ends and external multiplexers, reducing PCB area by >30% while maintaining ±0.5 LSB INL accuracy over –40°C to +85°C. |
Use Scenario: Real-time acquisition of phase currents and DC bus voltage in three-phase inverter drives for field-oriented control (FOC). IC Role / Device Role / Timing Role: High-speed analog input conditioner providing 50 kHz sampling of motor current shunt voltages and bus voltage with precise timing alignment via ACLK synchronization. Use Value: 13 µs conversion time enables sub-20 µs current loop update rates; ±15V overvoltage tolerance protects against inductive kickback without external clamping diodes. |
| Portable Environmental Logger | Medical Instrumentation Front-End |
|
Use Scenario: Battery-powered handheld device measuring ambient temperature, humidity, CO₂, and light intensity using mixed analog sensor outputs. IC Role / Device Role / Timing Role: Low-power multichannel ADC managing diverse sensor ranges (0–5V, ±2.5V) via software-selectable unipolar/bipolar mode and reference scaling. Use Value: 5–15 µA shutdown current extends AA battery life to >1 year in sleep mode; integrated S/H ensures accurate readings even with high-impedance electrochemical sensors. |
Use Scenario: Patient monitoring equipment acquiring ECG, respiration, and blood oxygen signals with strict noise and linearity requirements. IC Role / Device Role / Timing Role: Precision analog input stage providing 12-bit resolution, ±0.5 LSB INL, and differential input capability to reject 50/60 Hz mains interference. Use Value: Guaranteed no missing codes and low offset drift (<0.5 LSB over temperature) ensure diagnostic-grade waveform fidelity without calibration drift between patient sessions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 12-bit multichannel data acquisition applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS7822U | 12-bit, 200 kSPS, SPI-only interface, no built-in S/H, requires external reference, 10-lead MSOP package | Higher speed but lacks integrated sample-and-hold and differential MUX flexibility; better suited for single-channel high-throughput designs | Select ADS7822U when sampling rate >50 kSPS is required and external S/H/reference can be accommodated. |
| MAX11131ATI+ | 12-bit, 500 kSPS, internal reference, SPI interface, 16-pin TQFN, no bipolar mode or differential MUX | Higher speed and integrated reference, but limited to unipolar single-ended inputs only; no software-configurable differential pairs | Select MAX11131ATI+ for cost-sensitive, high-volume unipolar sensor arrays where differential rejection is handled externally. |
Compared with ADS7822U and MAX11131ATI+, the LTC1290CISW#PBF uniquely combines integrated sample-and-hold, configurable differential/single-ended MUX, bipolar conversion, and MICROWIRE/SPI compatibility in a single 20-pin SOIC - making it optimal for space-constrained industrial and medical systems requiring flexible analog front-end configuration without external support components.
Availability
LTC1290CISW#PBF is available at Aetrix Electronics and suitable for industrial process monitoring, motor control feedback, and portable environmental logging requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for LTC1290CISW#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 LTC1290CISW#PBF belongs to ADI's legacy Linear Technology data acquisition product line, designed specifically for embedded industrial and instrumentation systems needing integrated, software-configurable multichannel analog input with minimal external components.
FAQ
What is the operating temperature range of the LTC1290CISW#PBF?
The LTC1290CISW#PBF is rated for operation from –40°C to +85°C (C-grade). This specification is confirmed in the Absolute Maximum Ratings table and applies across all electrical parameters including offset error (±1.5 LSB), linearity error (±0.5 LSB), and conversion time (13 µs max). The device uses the "CI" suffix to denote this industrial temperature grade, and thermal performance is validated with θJA = 130°C/W for the SW package.
Does the LTC1290CISW#PBF require an external reference voltage?
No, the LTC1290CISW#PBF does not require an external reference voltage but supports it. It can operate with REF+ tied to VCC (5V) and REF– tied to AGND for unipolar mode, or use an external precision reference like the LT1027. The datasheet specifies reference current draw of 10–50 µA at VREF = 5V, and the input range is defined as (V–) – 0.05V to VCC + 0.05V - confirming internal biasing capability without external components.
How does the power shutdown feature work on the LTC1290CISW#PBF?
The LTC1290CISW#PBF enters power shutdown when the WL1 and WL0 bits in the 8-bit DIN configuration word are set to '0' and '1', respectively. In this state, supply current drops to 5–15 µA. A "dummy" conversion must be performed before shutdown to clock out the prior result as a 10-bit word. Operation resumes automatically upon next CS assertion or SCLK activity, with no reset sequence required - enabling rapid wake-up in duty-cycled systems.
Can the LTC1290CISW#PBF interface directly with an SPI microcontroller?
Yes, the LTC1290CISW#PBF interfaces directly with SPI microcontrollers such as the MC68HC05C4. Its four-wire synchronous serial interface (CS, SCLK, DIN, DOUT) matches SPI timing: data captured on SCLK rising edge, transmitted on falling edge. Programming the LTC1290CISW#PBF for MSB-first and 16-bit word length delivers the 12-bit result as two aligned bytes, with unused bits zero-filled - eliminating need for bit-shifting in firmware.
What is the maximum analog input overvoltage tolerance for the LTC1290CISW#PBF?
The LTC1290CISW#PBF supports ±15V overvoltage tolerance on analog inputs (CH0–CH7) relative to V–, provided input current is limited to 7 mA per channel (28 mA total) as specified in the Overvoltage Protection section. This protection is implemented via on-chip diodes clamping to V– and VCC, and remains effective even during conversion - enabling robust interfacing with industrial transducers without external protection networks.
LTC1290CISW#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:
- -
LTC1290CISW#PBF FAQ
1.How can I place an order for LTC1290CISW#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1290CISW#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 LTC1290CISW#PBF reliable?
The price and inventory of LTC1290CISW#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1290CISW#PBF is usually 5 days.
3.What payment methods are accepted for LTC1290CISW#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1290CISW#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1290CISW#PBF?
LTC1290CISW#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1290CISW#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 LTC1290CISW#PBF?
For technical support, including LTC1290CISW#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1290CISW#PBF requirements.
6.How does Aetrix verify that LTC1290CISW#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1290CISW#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 LTC1290CISW#PBF meets industry standards.
7.What is the process for return or replacement of LTC1290CISW#PBF?
All LTC1290CISW#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1290CISW#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 LTC1290CISW#PBF part is unused and in its original packaging.
Return procedure for LTC1290CISW#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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