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Analog Devices Inc. LTC1290DCN#PBF
- Part No.:
- LTC1290DCN#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 20-DIP (0.300", 7.62mm)
- Datasheet:
-
LTC1290DCN#PBF.pdf
- Description:
- IC DAS/ADC 12BIT 50K 20DIP
- Quantity:
- Payment:
- Shipping:
Inventory:148
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Product details
Overview
LTC1290DCN#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 configurable single-ended or differential inputs, ±5V common-mode range, unipolar/bipolar conversion modes, and operates from single 5V or dual ±5V supplies. It delivers 50kHz maximum throughput with 13µs max conversion time and 6.0mA typical supply current - used in industrial sensor interfaces and embedded data logging systems.
For engineers reviewing the LTC1290DCN#PBF datasheet, LTC1290DCN#PBF pinout, LTC1290DCN#PBF application, or LTC1290DCN#PBF equivalent, key selection considerations include its 20-pin PDIP package, software-programmable 8/12/16-bit word length, MSB/LSB-first serial I/O compatibility with MICROWIRE/SPI, built-in deglitching on CS, and guaranteed no missing codes over temperature.
Technical Context
The LTC1290DCN#PBF implements an LTCMOS switched-capacitor SAR architecture with on-chip sample-and-hold for all single-ended channels and programmable input configuration via 8-bit serial command. Its analog front-end supports ±15V overvoltage protection per channel (with current limiting), ±5V common-mode range, and 100pF on-channel input capacitance.
Serial communication uses four-wire full-duplex interface (CS, SCLK, DIN, DOUT) synchronized to ACLK (up to 4MHz). Conversion timing is defined by ACLK cycles: tCONV = 52 ACLK cycles, tSMPL = 7 SCLK cycles, and tACC = 2 ACLK cycles from CS↓ to valid DOUT - enabling deterministic microprocessor interfacing without external timing logic.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit unipolar or 11-bit + sign bipolar - provides 4096 distinct output codes with guaranteed no missing codes across operating temperature. |
| Input Channels | 8 single-ended or 4 differential (or mixed) - configured via 4-bit MUX address in serial command; COM pin serves as zero-reference for single-ended mode. |
| Conversion Rate | 50kHz maximum throughput - achieved with 4MHz ACLK and 52 ACLK-cycle conversion time, enabling real-time sampling of fast-changing analog signals. |
| Supply Current | 6.0mA typical at VCC = 5V, CS high - drops to 5–15µA in power shutdown mode (WL1=0, WL0=1), supporting battery-powered portable instrumentation. |
| Analog Input Range | 0V to 5V (unipolar) or ±5V (bipolar) - referenced to REF+ and REF−; supports ±15V fault tolerance with external current limiting per channel. |
| Serial Interface | 4-wire synchronous full-duplex - compatible with MICROWIRE, SPI, and parallel-port bit-banged implementations; supports 8/12/16-bit word lengths and MSB/LSB-first output. |
| Accuracy | ±1.5 LSB offset error, ±0.5 LSB INL (typ), ±0.5 LSB gain error (typ) - ensures high-fidelity digitization for precision measurement applications. |
Pinout & Package
Package: 20-lead plastic DIP (N package), 0°C to 70°C operating temperature range (DC grade), through-hole mounting.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CH0–CH7 (Pins 1–8) | Analog Input Channels | Configurable as single-ended (vs COM) or differential pairs; support ±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 path for internal logic; separate from AGND to minimize digital noise coupling into analog section. |
| AGND (Pin 11) | Analog Ground | Reference for analog circuitry and reference inputs; requires star grounding and direct connection to analog ground plane. |
| V– (Pin 12) | Negative Supply Rail | Required for bipolar operation (–5V); tied to ground in unipolar 5V-only systems. |
| REF+, REF– (Pins 13–14) | Reference Voltage Inputs | Define full-scale range; accept 0.05V below V– to 0.05V above VCC; internally clamped with diodes. |
| CS (Pin 15) | Chip Select | Active-low enable; includes deglitching (ignores pulses <1 ACLK cycle) and requires 2 ACLK falling edges before recognition. |
| DOUT (Pin 16) | Serial Data Output | Three-state output; data valid after tACC (2 ACLK cycles); transitions to Hi-Z when CS↑ (tdis ≤ 100ns). |
| DIN (Pin 17) | Serial Data Input | Accepts 8-bit configuration word on first 8 rising SCLK edges after CS↓; ignored thereafter until next CS cycle. |
| SCLK (Pin 18) | Shift Clock | Synchronizes serial data transfer; data latched on rising edge, output shifted on falling edge (full-duplex). |
| ACLK (Pin 19) | A/D Conversion Clock | Controls SAR conversion timing; min 15kHz @ 25°C, ≥125kHz @ 85°C recommended to limit S/H droop. |
| VCC (Pin 20) | Positive Supply | 4.5V to 5.5V operation; requires local 1µF+ bypass capacitor to AGND to suppress switching noise. |
Key Features
| Feature | Design Value |
|---|---|
| Software-configurable input topology | Select 4 differential or 8 single-ended channels (or combinations) via serial command - eliminates external mux hardware and enables dynamic reconfiguration. |
| Programmable data format | MSB-first or LSB-first output with selectable 8/12/16-bit word length - matches native register widths of diverse MCUs (e.g., COP402 nibble transfers, HC05 byte transfers). |
| Built-in sample-and-hold | Integrated S/H for all single-ended channels - removes need for external hold capacitor and simplifies anti-aliasing filter design. |
| Power shutdown mode | Reduces ICC to 5–15µA via WL1/WL0 command - enables ultra-low-power sleep states in portable data loggers without external power gating. |
| Noise-immune chip select | Hardware deglitching rejects sub-ACLK glitches and enforces 2-ACLK-edge synchronization - prevents spurious conversions in electrically noisy industrial environments. |
Applications
| Industrial Process Monitoring | Automotive Sensor Data Acquisition |
|---|---|
Use Scenario: Continuous voltage/current monitoring of PLC analog I/O modules with 4–20mA transducers and thermocouple inputs. IC Role / Device Role / Timing Role: Central 12-bit data acquisition node performing multiplexed sampling across 8 sensor channels with simultaneous S/H and serial output to host controller. Use Value: Eliminates discrete op-amp buffers and external sample-hold ICs; ±5V common-mode range accommodates field wiring offsets without level-shifting. |
Use Scenario: Cabin environmental sensing (temperature, humidity, CO₂) in automotive infotainment ECUs with space-constrained PCB layout. IC Role / Device Role / Timing Role: Low-power analog front-end acquiring conditioned sensor outputs and streaming digitized data via SPI to main MCU during periodic wake-up cycles. Use Value: 5–15µA shutdown current extends battery backup life; 20-pin PDIP allows manual prototyping and legacy board compatibility. |
| Portable Test Equipment | Energy Metering Front-End |
Use Scenario: Handheld multimeter with auto-ranging and true RMS calculation requiring high-accuracy DC/low-frequency AC sampling. IC Role / Device Role / Timing Role: Precision ADC subsystem providing calibrated 12-bit samples to DSP engine, leveraging bipolar mode for AC zero-crossing detection. Use Value: ±1.5 LSB offset and ±0.5 LSB INL ensure metrology-grade linearity; ±15V overvoltage tolerance protects against accidental probe misconnection. |
Use Scenario: Residential smart meter measuring voltage, current, and neutral current across multiple phases using isolated shunt/CT sensors. IC Role / Device Role / Timing Role: Multi-channel acquisition unit digitizing isolated analog outputs from signal conditioning stages, synchronized to utility line frequency. Use Value: Software-selectable differential inputs reject common-mode noise from switch-mode power supplies; 50kHz throughput supports harmonic analysis up to 2.5kHz. |
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, 200kSPS, SPI-only interface, no internal S/H, 8-pin SOIC package | Higher speed but requires external S/H and reference; lacks differential MUX flexibility and ±15V fault tolerance | Choose for cost-sensitive, high-throughput designs where external components are acceptable and board space is constrained. |
| MAX195BCPP | 16-bit, 100kSPS, parallel/serial interface, ±5V supply only, 28-pin PDIP | Higher resolution and speed but no software-configurable MUX topology; larger footprint and higher power (15mA) | Choose when 16-bit precision is mandatory and system-level S/H is already implemented externally. |
Compared with ADS7822U and MAX195BCPP, the LTC1290DCN#PBF uniquely integrates MUX, S/H, and flexible serial formatting in a compact 20-pin PDIP - reducing BOM count and layout complexity for medium-speed, multi-sensor industrial systems requiring robustness and configurability.
Availability
LTC1290DCN#PBF is available at Aetrix Electronics and suitable for industrial process monitoring, automotive sensor data acquisition, and portable test equipment requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for LTC1290DCN#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 LTC1290DCN#PBF belongs to ADI's legacy Linear Technology data acquisition product line, designed specifically for embedded systems needing integrated, software-configurable analog front-ends with minimal external components.
FAQ
What is the operating temperature range for the LTC1290DCN#PBF?
The LTC1290DCN#PBF is rated for 0°C to 70°C ambient operation (DC grade). This is confirmed in the Absolute Maximum Ratings table and ordering information section, where "DC" suffix denotes the commercial temperature range. It is not rated for extended industrial (–40°C to 85°C) or military ranges.
Does the LTC1290DCN#PBF require an external reference voltage?
Yes, the LTC1290DCN#PBF requires external reference voltages applied to REF+ and REF– pins. It does not contain an internal reference. The device supports reference voltages from (V–) – 0.05V to VCC + 0.05V, commonly 5V or ±5V, and draws up to 50µA reference current.
Can the LTC1290DCN#PBF perform simultaneous sampling across all 8 channels?
No, the LTC1290DCN#PBF performs sequential sampling using an internal multiplexer - only one channel is sampled and converted per command cycle. Simultaneous sampling would require multiple independent ADCs or a dedicated simultaneous-sampling ADC like the AD7606.
How is power shutdown enabled on the LTC1290DCN#PBF?
Power shutdown is enabled by sending a serial configuration word with WL1 = 0 and WL0 = 1 (binary 01) to the LTC1290DCN#PBF. This reduces supply current to 5–15µA. A "dummy" conversion must precede shutdown to output the final result as a 10-bit word.
Is the LTC1290DCN#PBF pin-compatible with other variants like LTC1290BCN or LTC1290CIN?
Yes, all LTC1290 variants (including LTC1290BCN, LTC1290CIN, and LTC1290DCN#PBF) share identical 20-pin PDIP pinout and package dimensions. Differences are limited to temperature grade (B = –25°C to 85°C, C = 0°C to 70°C, D = 0°C to 70°C) and electrical specifications such as offset and gain error limits.
LTC1290DCN#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 20-DIP (0.300", 7.62mm)
- 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-PDIP
- Mounting Type:
- Through Hole
- Grade:
- -
- Qualification:
- -
LTC1290DCN#PBF FAQ
1.How can I place an order for LTC1290DCN#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1290DCN#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 LTC1290DCN#PBF reliable?
The price and inventory of LTC1290DCN#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1290DCN#PBF is usually 5 days.
3.What payment methods are accepted for LTC1290DCN#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1290DCN#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1290DCN#PBF?
LTC1290DCN#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1290DCN#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 LTC1290DCN#PBF?
For technical support, including LTC1290DCN#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1290DCN#PBF requirements.
6.How does Aetrix verify that LTC1290DCN#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1290DCN#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 LTC1290DCN#PBF meets industry standards.
7.What is the process for return or replacement of LTC1290DCN#PBF?
All LTC1290DCN#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1290DCN#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 LTC1290DCN#PBF part is unused and in its original packaging.
Return procedure for LTC1290DCN#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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