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Analog Devices Inc. LTC1290CIN#PBF
- Part No.:
- LTC1290CIN#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 20-DIP (0.300", 7.62mm)
- Datasheet:
-
LTC1290CIN#PBF.pdf
- Description:
- IC DAS/ADC 12BIT 50K 20DIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,289
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Product details
Overview
LTC1290CIN#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 both single-ended (0V–5V or ±5V) and differential (±5V common-mode) inputs, delivers 50kHz maximum throughput, and operates from a single 5V or dual ±5V supply. It is used in industrial sensor monitoring systems requiring multi-channel precision analog input conditioning.
For engineers reviewing the LTC1290CIN#PBF datasheet, LTC1290CIN#PBF pinout, LTC1290CIN#PBF application, or LTC1290CIN#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 sample-and-hold for all single-ended channels, and 13µs max conversion time over temperature.
Technical Context
The LTC1290CIN#PBF implements a capacitive DAC-based successive approximation architecture with LTCMOS switched-capacitor technology. Its analog front-end includes an 8-channel multiplexer configurable per channel for single-ended or differential operation, plus internal sample-and-hold active only on single-ended inputs.
Serial communication uses a four-wire synchronous full-duplex interface (CS, SCLK, DIN, DOUT) compatible with MICROWIRE and SPI protocols. Conversion timing is governed by two clocks: ACLK (4MHz max) controls SAR core and sample-and-hold, while SCLK (2MHz max) controls serial data transfer - enabling independent optimization of acquisition speed and host interface bandwidth.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit unipolar or 11-bit + sign bipolar - enables 1 LSB = 1.22mV (5V ref) or 2.44mV (bipolar ±5V span) quantization step size. |
| Input Channels | 8 analog inputs (CH0–CH7) with programmable single-ended/differential configuration - supports up to four simultaneous differential pairs or eight single-ended signals referenced to COM. |
| Throughput Rate | 50kHz maximum - corresponds to 20µs minimum total cycle time, suitable for real-time control loop sampling at ≤20kHz closed-loop bandwidth. |
| Conversion Time | 13µs maximum over temperature - guarantees deterministic latency for time-critical acquisition in motion control or power converter feedback. |
| Supply Current | 6.0mA typical (CS high), 5–15µA in power shutdown - enables low-power operation during idle periods in battery-backed data loggers. |
| Analog Input Range | Single-ended: 0V to 5V or ±5V; Differential: ±5V common-mode - accommodates industrial 4–20mA transducer outputs with appropriate scaling resistors. |
| Reference Support | External REF+ and REF– pins accept 1V–5V reference voltage - allows use of precision bandgap (e.g., LT1027) or ratiometric sensor excitation. |
Pinout & Package
Package: 20-lead PDIP (N package), 0°C to 70°C operating temperature range (C 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; each has ±15V overvoltage tolerance with current limiting. |
| COM (Pin 9) | Single-Ended Reference Node | 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 | Return path for internal logic; separate from AGND to minimize digital noise coupling into analog path. |
| AGND (Pin 11) | Analog Ground Reference | Primary ground reference for analog circuitry including S/H, ADC core, and reference inputs; requires star grounding. |
| V– (Pin 12) | Negative Supply Rail | Required for bipolar operation (–5V); tied to GND in unipolar 5V-only systems. |
| REF+, REF– (Pins 13–14) | External Reference Inputs | Define full-scale ADC range; support external precision references or ratiometric sensor bridges. |
| CS (Pin 15) | Chip Select Enable | Active-low serial interface enable; includes deglitching to reject noise spikes shorter than one ACLK cycle. |
| DOUT (Pin 16) | Serial Data Output | Three-state output delivering conversion result; transitions from Hi-Z to valid data after CS recognition and tACC delay. |
| DIN (Pin 17) | Serial Configuration Input | Receives 8-bit command word defining MUX address, unipolar/bipolar mode, MSB/LSB order, and word length. |
| SCLK (Pin 18) | Serial Shift Clock | Controls bit timing for DIN/DOUT transfers; data latched on rising edge, output valid on falling edge. |
| ACLK (Pin 19) | A/D Conversion Clock | Drives SAR core and sample-and-hold; frequency determines conversion speed and S/H acquisition fidelity. |
| VCC (Pin 20) | Positive Supply Rail | 5V nominal supply; bypassing to AGND with ≥1µF capacitor required to maintain PSRR and avoid code errors. |
Key Features
| Feature | Design Value |
|---|---|
| Software-configurable input topology | Per-channel selection of single-ended or differential mode via 4-bit MUX address - eliminates external switch ICs in mixed-signal sensor arrays. |
| Integrated sample-and-hold | On-chip S/H active for all single-ended channels - removes need for external hold capacitor and driver op amp in DC-coupled applications. |
| Flexible serial interface | MSB/LSB-first output and 8/12/16-bit word length programmability - matches native word formats of COP402, MC68HC05, TMS320, and other legacy microcontrollers without bit-shifting overhead. |
| Power shutdown mode | 5–15µA standby current with WL1=0/WL0=1 command - extends battery life in portable instrumentation between acquisition bursts. |
| Overvoltage protected inputs | ±15V fault tolerance on CH0–CH7 with per-channel current limiting (7mA/channel max) - enables direct connection to industrial field wiring without external clamping diodes. |
Applications
| Industrial Process Monitoring | Motor Control Feedback |
|---|---|
Use Scenario: Continuous acquisition of temperature, pressure, and flow sensor outputs across 8 PLC I/O modules. IC Role / Device Role / Timing Role: Centralized 12-bit analog front-end digitizing multiple 4–20mA transducer signals with synchronized sampling. Use Value: Eliminates per-channel signal conditioning components; 50kHz throughput supports 10ms scan cycles across all 8 channels. | Use Scenario: Real-time capture of three-phase current and DC bus voltage in servo drive inverters. IC Role / Device Role / Timing Role: Simultaneous sampling of motor phase currents (differential) and DC link voltage (single-ended) for FOC algorithms. Use Value: On-chip S/H ensures coherent sampling across channels; 13µs conversion time meets <20µs control loop latency requirements. |
| Portable Data Logger | Test & Measurement Equipment |
Use Scenario: Battery-powered environmental logger recording thermocouple, RTD, and humidity sensor outputs over 72-hour deployments. IC Role / Device Role / Timing Role: Low-power acquisition subsystem entering shutdown between 1-second measurement intervals. Use Value: 5µA shutdown current extends AA battery life to >1 year; external reference enables ratiometric accuracy without calibration drift. | Use Scenario: Modular benchtop multimeter supporting voltage, current, and resistance measurements with auto-ranging. IC Role / Device Role / Timing Role: Precision digitizer core accepting programmable gain amplifier outputs and reference voltages. Use Value: Software-selectable unipolar/bipolar mode simplifies front-end design for bidirectional current sensing and AC voltage RMS calculation. |
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, 200kHz SAR ADC; SPI-only interface; no built-in S/H; requires external reference buffer. | Higher speed but lacks integrated sample-and-hold and flexible MUX configuration - demands more external components for multi-channel use. | Preferred when >100kSPS throughput is required and board space permits discrete S/H and reference circuitry. |
| MAX120CPD | 12-bit, 100kHz SAR ADC; parallel/serial interface; ±5V supply only; no software-configurable MUX mode. | Fixed single-ended input topology and parallel interface limit compatibility with modern microcontrollers - requires level-shifting for 3.3V hosts. | Consider for legacy 8-bit MPU designs where parallel bus access is available and differential input is not needed. |
Compared with ADS7822U and MAX120CPD, the LTC1290CIN#PBF uniquely integrates sample-and-hold, software-configurable 8-channel MUX, and dual-supply flexibility in a single PDIP package - reducing BOM count and layout complexity for medium-speed multi-sensor systems.
Availability
LTC1290CIN#PBF is available at Aetrix Electronics and suitable for industrial process monitoring, motor control feedback, portable data logging, and test & measurement equipment requiring stable component supply and long-term obsolescence management.
Supply support for LTC1290CIN#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 LTC1290CIN#PBF belongs to ADI's legacy Linear Technology data acquisition product line, designed specifically for cost-sensitive, medium-speed embedded systems needing integrated analog front-end functionality without FPGA or complex controller dependencies.
FAQ
What is the operating temperature range for the LTC1290CIN#PBF?
The LTC1290CIN#PBF is rated for 0°C to 70°C ambient operation (C-grade). This specification is confirmed in the Absolute Maximum Ratings table and applies across all guaranteed performance parameters including offset error (±1.5 LSB), INL (±0.5 LSB), and conversion time (13µs max). Operation outside this range may cause parametric shift or functional failure.
Does the LTC1290CIN#PBF require an external clock source?
Yes, the LTC1290CIN#PBF requires two external clocks: ACLK (A/D conversion clock, up to 4MHz) and SCLK (serial shift clock, up to 2MHz). ACLK drives the SAR core and sample-and-hold; SCLK synchronizes DIN/DOUT data transfer. Both clocks must be provided by the host system - no internal oscillator is present.
Can the LTC1290CIN#PBF perform true differential measurements across arbitrary channel pairs?
No. The LTC1290CIN#PBF supports differential mode only across predefined adjacent pairs: CH0–CH1, CH2–CH3, CH4–CH5, and CH6–CH7. The MUX address bits select one of these four differential combinations or any of the eight single-ended channels relative to COM - it does not allow arbitrary pairings like CH3–CH5.
How is power shutdown activated on the LTC1290CIN#PBF?
Power shutdown is enabled by setting WL1=0 and WL0=1 in the 8-bit DIN configuration word. This reduces supply current to 5–15µA. Note that the previous conversion result outputs as a 10-bit word, so a "dummy" conversion cycle is required before shutdown takes effect - verified in the Applications Information section on Word Length control.
What is the maximum allowed source impedance for analog inputs on the LTC1290CIN#PBF?
The LTC1290CIN#PBF specifies a maximum source resistance of 10kΩ for accurate 0.02% acquisition within 10µs, based on Figure TPC11 (Sample-and-Hold Acquisition Time vs Source Resistance). Exceeding 10kΩ increases acquisition time nonlinearly and risks missing codes due to S/H droop - external op-amp buffering is recommended above this value.
LTC1290CIN#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:
- -40°C ~ 85°C
- Supplier Device Package:
- 20-PDIP
- Mounting Type:
- Through Hole
- Grade:
- -
- Qualification:
- -
LTC1290CIN#PBF FAQ
1.How can I place an order for LTC1290CIN#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1290CIN#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 LTC1290CIN#PBF reliable?
The price and inventory of LTC1290CIN#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1290CIN#PBF is usually 5 days.
3.What payment methods are accepted for LTC1290CIN#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1290CIN#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1290CIN#PBF?
LTC1290CIN#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1290CIN#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 LTC1290CIN#PBF?
For technical support, including LTC1290CIN#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1290CIN#PBF requirements.
6.How does Aetrix verify that LTC1290CIN#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1290CIN#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 LTC1290CIN#PBF meets industry standards.
7.What is the process for return or replacement of LTC1290CIN#PBF?
All LTC1290CIN#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1290CIN#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 LTC1290CIN#PBF part is unused and in its original packaging.
Return procedure for LTC1290CIN#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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