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Analog Devices Inc. LTC1290DIN#PBF
- Part No.:
- LTC1290DIN#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 20-DIP (0.300", 7.62mm)
- Datasheet:
-
LTC1290DIN#PBF.pdf
- Description:
- IC DAS/ADC 12BIT 50K 20DIP
- Quantity:
- Payment:
- Shipping:
Inventory:4,359
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Product details
Overview
LTC1290DIN#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 unipolar (0V–5V or ±5V) and bipolar (±5V) input ranges, delivers 50kHz maximum throughput, and operates from single +5V or dual ±5V supplies. It is used in industrial sensor monitoring systems requiring multi-channel precision analog-to-digital conversion with microprocessor serial interface.
For engineers reviewing the LTC1290DIN#PBF datasheet, LTC1290DIN#PBF pinout, LTC1290DIN#PBF application, or LTC1290DIN#PBF equivalent, key selection considerations include its software-programmable unipolar/bipolar mode, MSB/LSB-first output format, 8/12/16-bit variable word length, on-chip sample-and-hold for all single-ended channels, and direct compatibility with MICROWIRE, SPI, and parallel-port-emulated serial interfaces.
Technical Context
The LTC1290DIN#PBF implements a capacitive DAC-based successive approximation architecture with an integrated 8:1 analog multiplexer supporting mixed single-ended and differential channel configurations. Its serial interface uses independent ACLK (for conversion timing) and SCLK (for data transfer), enabling precise control over sampling and readout timing.
It features a deglitcher on the CS input that requires two ACLK falling edges before recognition, and includes programmable power shutdown via DIN command (WL1=0, WL0=1), reducing supply current to ≤15µA. Conversion results are delayed by one CS cycle relative to the configuration word, and output coding is automatically 2's complement in bipolar mode.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit unipolar or 11-bit + sign bipolar - defines full-scale quantization step size (e.g., 1.22mV LSB at 5V reference) |
| Input Channels | 8 single-ended or 4 differential (configurable per MUX address) - enables flexible sensor interfacing without external mux hardware |
| Throughput Rate | 50kHz max - supports real-time sampling of signals up to ~20kHz (Nyquist-limited) |
| Conversion Time | 13µs max over temperature - determines minimum inter-conversion interval in high-speed sequencing |
| Supply Current | 6.0mA typical active, ≤15µA in power shutdown - enables low-power operation in battery-backed or intermittent-scan systems |
| Analog Input Range | 0V to 5V (unipolar) or ±5V (bipolar), ±15V overvoltage tolerance - allows direct connection to industrial transducers without external level-shifting |
| Reference Voltage | External REF+ and REF− pins - supports user-defined full-scale range and ratiometric measurement against stable references |
Pinout & Package
Package: 20-lead PDIP (N package), 0.3-inch width, through-hole mounting. Pin 1 = CH0, Pin 20 = VCC. Compatible with standard DIP sockets and wave-solder processes.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CH0–CH7 (Pins 1–8) | Analog Input Channels | Accept single-ended or differential voltage inputs; each channel has ≤1µA leakage (25°C) and 100pF on-channel capacitance |
| COM (Pin 9) | Single-Ended Reference Node | Zero-reference point for all single-ended measurements; must be low-noise and tied directly to AGND plane |
| DGND (Pin 10) | Digital Ground Return | Return path for internal logic; separate from AGND to minimize digital noise coupling into analog section |
| AGND (Pin 11) | Analog Ground Reference | Primary ground reference for analog circuitry, REF+, REF−, and V–; requires star-point connection to system AGND |
| V– (Pin 12) | Negative Supply Rail | Supports bipolar operation (e.g., –5V); also serves as lower rail for overvoltage protection clamp diodes |
| REF+, REF– (Pins 13–14) | External Reference Inputs | Define full-scale range; accept 0.05V below V– to 0.05V above VCC; require low-impedance, low-noise source (≤50µA max sink/source) |
| CS (Pin 15) | Chip Select Input | Active-low enable for serial communication; includes built-in deglitcher rejecting <1 ACLk-cycle noise spikes |
| DOUT (Pin 16) | Serial Data Output | Three-state output delivering conversion result; transitions to Hi-Z when CS is high; delay ≤220ns after SCLK↓ |
| DIN (Pin 17) | Serial Data Input | Receives 8-bit configuration word (MUX address, UNI, MSBF, WL1/WL0); setup/hold times ≥50ns relative to SCLK |
| SCLK (Pin 18) | Shift Clock Input | Synchronizes serial data transfer; max frequency 2MHz; data latched on rising edge, output valid on falling edge |
| ACLK (Pin 19) | A/D Conversion Clock | Controls SAR conversion timing; min 15kHz (25°C), min 125kHz (85°C); max 4MHz; determines tCONV = 52 ACLk cycles |
| VCC (Pin 20) | Positive Supply Rail | +5V nominal; supports 4.5V–5.25V range; requires local 1µF+ bypassing to AGND to maintain PSRR >70dB |
Key Features
| Feature | Design Value |
|---|---|
| Software-configurable input mode | Select unipolar (0V–5V) or bipolar (±5V) conversion via DIN bit UNI - eliminates need for external op-amp level-shifting networks |
| Flexible serial output format | Programmable MSB-first or LSB-first order and 8/12/16-bit word length - matches native register widths of COP402, MC68HC05, TMS320, and parallel-port emulators |
| On-chip sample-and-hold | Integrated S/H for all single-ended channels - removes requirement for external S/H IC and associated timing control logic |
| Direct MPU interface capability | Four-wire synchronous serial interface compatible with MICROWIRE, SPI, and SCI protocols - no glue logic required for common microcontrollers |
| Low-power shutdown mode | Enters sub-15µA standby via WL1/WL0 command - enables energy-efficient polling or wake-on-event architectures in portable instrumentation |
Applications
| Industrial Process Monitoring | Automotive Sensor Data Acquisition |
|---|---|
|
Use Scenario: Continuous logging of temperature, pressure, and flow sensor outputs across 8 RTD or strain-gauge bridges in a PLC rack. IC Role / Device Role / Timing Role: Central 12-bit ADC with multiplexed analog front-end; performs sequential conversions every 20µs using auto-sequenced MUX addresses. Use Value: Eliminates need for eight discrete ADCs or external analog switches; ±5V bipolar support accommodates offset-tolerant bridge outputs without signal conditioning. |
Use Scenario: Real-time capture of engine knock, throttle position, coolant temperature, and O2 sensor voltages in an ECU prototype board. IC Role / Device Role / Timing Role: Multi-channel sampling subsystem synchronized to MCU timer interrupts; uses CS-low-during-conversion mode for deterministic latency. Use Value: 13µs conversion time ensures sub-100µs total channel scan for 8 sensors; on-chip S/H maintains accuracy despite varying source impedances (up to 10kΩ). |
| Portable Data Logger | Lab Equipment Signal Conditioning |
|
Use Scenario: Battery-powered environmental monitor measuring light, humidity, CO₂, and ambient noise across four differential and four single-ended inputs. IC Role / Device Role / Timing Role: Low-power data acquisition core; enters shutdown between 1-second sampling intervals using WL1/WL0 command. Use Value: Reduces average supply current from 6mA to <1µA during idle, extending AA battery life beyond 12 months at 1Hz sampling. |
Use Scenario: Modular oscilloscope front-end where each channel conditions and digitizes ±10V analog signals before FPGA processing. IC Role / Device Role / Timing Role: Precision ADC stage with external 5V reference; configured for 12-bit unipolar mode and MSB-first output aligned to FPGA shift registers. Use Value: Guaranteed no missing codes and ±0.5 LSB INL ensure accurate waveform reconstruction; REF+/REF− isolation prevents ground-loop-induced offset drift. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 12-bit multi-channel ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS7822U | 12-bit, 200kHz SAR ADC; SPI-only interface; no on-chip S/H; requires external reference; 8-pin SOIC | Higher speed but lacks differential MUX flexibility and built-in S/H - needs external op-amps for bipolar inputs and sample hold | Choose for cost-sensitive, high-throughput designs where external signal conditioning is already present |
| MAX125ACPP | 14-bit, 100kHz dual 4-channel ADC; simultaneous sampling; internal reference; 28-pin PDIP | Higher resolution and true simultaneous capture, but larger footprint, higher power (15mA), and no software-selectable unipolar/bipolar mode | Choose when phase-coherent multi-channel acquisition (e.g., motor current/voltage) is required over raw channel count |
Compared with ADS7822U and MAX125ACPP, the LTC1290DIN#PBF uniquely combines 12-bit precision, integrated S/H, flexible MUX configuration, and ultra-low shutdown current in a 20-pin PDIP - making it optimal for space-constrained, mixed-signal industrial controllers needing both bipolar sensor support and power efficiency.
Availability
LTC1290DIN#PBF is available at Aetrix Electronics and suitable for industrial process monitoring, automotive ECU prototyping, portable data loggers, and lab-grade signal conditioning systems requiring stable component supply, long-term obsolescence management, and traceable sourcing.
Supply support for LTC1290DIN#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 LTC1290DIN#PBF belongs to ADI's legacy Linear Technology data acquisition product line, designed specifically for embedded systems requiring compact, software-configurable, multi-channel ADC functionality with minimal external components.
FAQ
What is the operating temperature range for the LTC1290DIN#PBF?
The LTC1290DIN#PBF is rated for –40°C to +85°C (industrial grade). This is confirmed by the "DI" suffix in the part number and specified in the Absolute Maximum Ratings table. The device maintains guaranteed performance-including ±0.75 LSB INL and 13µs max conversion time-across this full range when operated within recommended supply and clock conditions.
Does the LTC1290DIN#PBF require an external reference voltage?
Yes, the LTC1290DIN#PBF requires external connections to REF+ and REF– pins to define its full-scale range. It does not include an internal reference. The reference must be stable, low-noise, and capable of sourcing/sinking up to 50µA. Common implementations use precision references like LT1027 or buffered DAC outputs tied directly to REF+ and REF– with proper decoupling.
Can the LTC1290DIN#PBF perform simultaneous sampling across multiple channels?
No, the LTC1290DIN#PBF uses a single SAR ADC core with a sequential analog multiplexer-it acquires one channel at a time. While it supports rapid scanning (up to 50kHz aggregate throughput), there is no hardware provision for simultaneous sampling or hold-and-convert timing across channels. For true simultaneous acquisition, alternatives like MAX125ACPP would be required.
How is power shutdown activated on the LTC1290DIN#PBF?
Power shutdown is activated by sending a configuration word with WL1 = 0 and WL0 = 1 on the DIN line during a CS-active cycle. This places the LTC1290DIN#PBF into a low-current state (<15µA). Note that the prior conversion result is output as a 10-bit word, so a "dummy" conversion is required before shutdown to ensure valid data is available upon wake-up.
Is the LTC1290DIN#PBF pin-compatible with other variants like LTC1290BIN or LTC1290CIN?
Yes, all LTC1290xIN variants (BIN, CIN, DIN) share identical 20-pin PDIP packaging and pinout. The suffix denotes temperature grade (B = 0°C–70°C, C = 0°C–70°C commercial, D = –40°C–85°C industrial), not functional or mechanical differences. Designers may substitute LTC1290DIN#PBF for BIN/CIN in industrial environments without layout changes.
LTC1290DIN#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:
- -
LTC1290DIN#PBF FAQ
1.How can I place an order for LTC1290DIN#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1290DIN#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 LTC1290DIN#PBF reliable?
The price and inventory of LTC1290DIN#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1290DIN#PBF is usually 5 days.
3.What payment methods are accepted for LTC1290DIN#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1290DIN#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1290DIN#PBF?
LTC1290DIN#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1290DIN#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 LTC1290DIN#PBF?
For technical support, including LTC1290DIN#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1290DIN#PBF requirements.
6.How does Aetrix verify that LTC1290DIN#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1290DIN#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 LTC1290DIN#PBF meets industry standards.
7.What is the process for return or replacement of LTC1290DIN#PBF?
All LTC1290DIN#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1290DIN#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 LTC1290DIN#PBF part is unused and in its original packaging.
Return procedure for LTC1290DIN#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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