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Analog Devices Inc. LTC2326IMS-18#PBF
- Part No.:
- LTC2326IMS-18#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 16-TFSOP (0.118", 3.00mm Width)
- Datasheet:
-
LTC2326IMS-18#PBF.pdf
- Description:
- IC ADC 18BIT SAR 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,977
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Product details
Overview
LTC2326IMS-18#PBF from Analog Devices (formerly Linear Technology) is an 18-bit, 250ksps successive approximation register (SAR) analog-to-digital converter with pseudo-differential inputs and true bipolar ±10.24V input range. It operates from a single 5V supply, delivers 95dB SNR and ±5LSB INL (max), and integrates a low-drift 2.048V internal reference with onboard buffer-making it suitable for high-precision industrial data acquisition systems requiring wide dynamic range and low power.
For engineers reviewing the LTC2326IMS-18#PBF datasheet, LTC2326IMS-18#PBF pinout, LTC2326IMS-18#PBF application, or LTC2326IMS-18#PBF equivalent, key selection considerations include its guaranteed 18-bit no-missing-codes performance, daisy-chain SPI interface supporting 1.8V–5V logic, internal conversion clock eliminating external timing constraints, and operation across –40°C to +85°C industrial temperature range.
Technical Context
The LTC2326IMS-18#PBF employs a charge redistribution capacitor DAC architecture with pseudo-differential sampling, where IN+ accepts ±10.24V signals referenced to IN– (±500mV range). Its internal 2.048V bandgap reference feeds a gain-of-2 buffer to produce 4.096V at REFBUF, enabling ±10.24V full-scale input swing without external components.
Conversion is initiated by a rising edge on CNV; the internal oscillator sets tCONV = 1.9–3µs with zero cycle latency. The SPI-compatible serial interface supports both normal mode (RDL/SDI as bus enable) and daisy-chain mode (RDL/SDI as SDI), with SDO outputting 18-bit two's complement data MSB-first on SCK rising edges.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 18-bit - guarantees monotonic transfer function and no missing codes over full temperature range. |
| Sampling Rate | 250ksps - enables real-time capture of signals up to 7MHz bandwidth (–3dB input linear bandwidth). |
| SNR | 95dB (typ) at fIN = 2kHz - supports high-fidelity signal reconstruction in precision instrumentation. |
| INL | ±5LSB (max) - ensures accurate amplitude measurement across full ±10.24V input range. |
| Reference | 2.048V internal bandgap (20ppm/°C max drift) with integrated x2 buffer - eliminates need for external reference in most applications. |
| Power Dissipation | 28mW (typ) at 250ksps; 300μW in sleep mode - enables energy-efficient operation in portable or thermally constrained systems. |
| Temperature Range | –40°C to +85°C - qualified for industrial process control and automated test equipment environments. |
Pinout & Package
Package: 16-lead plastic MSOP (3mm × 4.9mm, 0.65mm pitch), RoHS-compliant, lead-free finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDDLBYP (1) | 2.5V LDO bypass | On-chip regulator output; requires 2.2µF ceramic capacitor to GND for stable 2.5V supply to internal circuitry. |
| VDD (2) | Main analog supply | 4.75V–5.25V input powering ADC core and reference; bypassed with 10µF ceramic capacitor. |
| GND (3,6,16) | Analog/digital ground | Three dedicated ground pins minimize noise coupling between analog and digital sections. |
| IN+ (4) | Pseudo-differential analog input | Accepts true bipolar signal from –10.24V to +10.24V relative to IN–; input impedance ~2kΩ. |
| IN– (5) | Common-mode sense reference | ±500mV range w.r.t. GND; used for remote ground sensing or common-mode rejection in differential configurations. |
| REFBUF (7) | Buffered reference output | Nominally 4.096V (2×REFIN); decoupled with 47µF ceramic capacitor; can be overdriven externally (2.5V–5V). |
| REFIN (8) | Internal reference output / external reference input | 2.048V bandgap output (bypass with 100nF); accepts external reference 1.25V–2.4V for improved accuracy. |
| CNV (9) | Convert trigger | Rising-edge–initiated conversion start; powers up ADC and synchronizes acquisition phase. |
| CHAIN (10) | Daisy-chain mode select | High = chain mode (RDL/SDI becomes SDI); low = normal mode (RDL/SDI enables/disables SDO). |
| BUSY (11) | Conversion status indicator | Active-high open-drain output signaling conversion in progress; logic levels referenced to OVDD. |
| RDL/SDI (12) | Serial bus control / data input | Mode-dependent: bus enable (CHAIN=low) or serial data input (CHAIN=high); OVDD-referenced I/O. |
| SCK (13) | Serial clock input | Drives SPI interface timing; supports up to 100MHz (10ns period); rising-edge data capture. |
| SDO (14) | Serial data output | 18-bit two's complement result shifted MSB-first; tri-state when RDL=low (normal mode). |
| OVDD (15) | I/O interface supply | 1.71V–5.25V digital interface supply; sets logic thresholds for all digital pins; bypassed with 0.1µF. |
Key Features
| Feature | Design Value |
|---|---|
| No pipeline delay, zero cycle latency | Enables deterministic real-time control loops without output data lag or FIFO buffering. |
| Onboard single-shot capable reference buffer | Eliminates external op-amp buffer requirement while maintaining stability under varying load conditions. |
| Programmable daisy-chain SPI interface | Allows synchronous multi-ADC acquisition with shared SCK and BUSY, reducing host controller pin count. |
| Auto-nap between conversions | Reduces average power proportionally to sampling rate-critical for battery-powered or thermally sensitive designs. |
| Guaranteed operation to 125°C (H-grade variant) | Validated thermal robustness supports deployment in harsh environments like motor drives and downhole tools. |
Applications
| Industrial Process Control | High-Speed Data Acquisition |
|---|---|
Use Scenario: Monitoring pressure, temperature, and flow sensors in PLC-based control cabinets with ±10V field signals. IC Role / Device Role / Timing Role: Primary digitizer converting analog sensor outputs into high-resolution digital values for closed-loop feedback. Use Value: ±5LSB INL and 95dB SNR ensure accurate representation of small signal variations amid electrical noise in factory environments. |
Use Scenario: Capturing transient waveforms in oscilloscope front-ends or vibration analysis systems. IC Role / Device Role / Timing Role: High-throughput SAR ADC providing jitter-free sampling at 250ksps with no latency for time-domain analysis. Use Value: Internal oscillator and zero-cycle-latency operation eliminate external clock synchronization complexity and timing skew. |
| Portable Instrumentation | Automated Test Equipment (ATE) |
Use Scenario: Battery-powered handheld multimeters or calibration standards requiring precision and low power. IC Role / Device Role / Timing Role: Core ADC delivering 18-bit resolution while consuming only 28mW active or 300μW in sleep mode. Use Value: Auto-nap and sleep modes extend battery life without sacrificing measurement fidelity during intermittent sampling. |
Use Scenario: Channel expansion in modular ATE systems needing synchronized multi-channel voltage measurements. IC Role / Device Role / Timing Role: Daisy-chainable SPI ADC enabling simultaneous sampling across multiple boards with minimal interconnect. Use Value: CHAIN pin and RDL/SDI dual-function support reduce PCB routing complexity and system-level timing validation effort. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-resolution SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS8860IDRCT | 16-bit, 1MSPS, single-ended input, external reference required, no integrated buffer. | Higher speed but lower resolution and no true bipolar input; requires external op-amp and reference design. | Select when >1MSPS sampling is needed and ±10.24V bipolar range is not required. |
| AD7606C-18BSTZ | 8-channel, simultaneous-sampling, ±10V range, 200ksps per channel, parallel/SPI interface. | Multi-channel integration reduces board space vs discrete ADCs but lacks daisy-chain flexibility and has higher power (65mW). | Select for multi-sensor systems requiring phase-coherent sampling across channels without FPGA coordination. |
Compared with ADS8860IDRCT and AD7606C-18BSTZ, the LTC2326IMS-18#PBF uniquely combines 18-bit no-missing-codes resolution, integrated ±10.24V bipolar input, daisy-chain SPI, and sub-30mW power-making it optimal for single-channel, high-fidelity, thermally constrained industrial measurement nodes.
Availability
LTC2326IMS-18#PBF is available at Aetrix Electronics and suitable for industrial process control, high-speed data acquisition, and portable instrumentation requiring stable component supply, long-term lifecycle support, and guaranteed industrial temperature grade performance.
Supply support for LTC2326IMS-18#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 technologies, serving industrial, automotive, communications, and healthcare markets.
The LTC2326IMS-18#PBF belongs to ADI's legacy Linear Technology precision SAR ADC product line, engineered for high-voltage, high-dynamic-range measurement applications demanding low noise, excellent linearity, and simplified system integration.
FAQ
What is the operating temperature range for the LTC2326IMS-18#PBF?
The LTC2326IMS-18#PBF is specified for operation from –40°C to +85°C (I-grade), validated across this range for parameters including INL, SNR, and reference drift. This makes LTC2326IMS-18#PBF suitable for industrial environments where ambient temperatures exceed commercial limits, unlike the C-grade (0°C to 70°C) or H-grade (–40°C to 125°C) variants.
Does the LTC2326IMS-18#PBF require an external reference?
No-the LTC2326IMS-18#PBF includes a factory-trimmed 2.048V internal bandgap reference and a gain-of-2 reference buffer, enabling direct ±10.24V bipolar operation without external components. REFIN and REFBUF pins support optional external reference overdrive (1.25V–2.4V at REFIN or 2.5V–5V at REFBUF) for enhanced accuracy or drift performance.
How does the daisy-chain mode work on the LTC2326IMS-18#PBF?
When CHAIN = high, the LTC2326IMS-18#PBF enters daisy-chain mode: RDL/SDI becomes SDI (serial data input), accepting SDO output from the preceding device in the chain. SDO then outputs the concatenated result-enabling synchronized multi-ADC acquisition using a single SCK and BUSY line, which simplifies timing and reduces host interface resource usage.
What is the significance of "no cycle latency" in the LTC2326IMS-18#PBF?
"No cycle latency" means the LTC2326IMS-18#PBF outputs the conversion result of the *just-completed* sample immediately after BUSY goes low-without pipeline delay or FIFO buffering. This allows deterministic real-time response in control applications, unlike pipelined or sigma-delta ADCs that introduce fixed-sample delays, making LTC2326IMS-18#PBF ideal for closed-loop systems.
Can the LTC2326IMS-18#PBF operate from a 3.3V digital supply?
Yes-the LTC2326IMS-18#PBF supports OVDD from 1.71V to 5.25V, so it interfaces seamlessly with 3.3V microcontrollers or FPGAs. Digital pins (SCK, SDO, RDL/SDI, BUSY, CHAIN, CNV) use OVDD-referenced logic thresholds (VIH = 0.8×OVDD, VIL = 0.2×OVDD), ensuring reliable communication without level shifters when OVDD = 3.3V.
LTC2326IMS-18#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-TFSOP (0.118", 3.00mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Number of Bits:
- 18
- Sampling Rate (Per Second):
- 250k
- Number of Inputs:
- 1
- Input Type:
- Pseudo-Differential
- Data Interface:
- SPI
- Configuration:
- S/H-ADC
- Ratio - S/H:ADC:
- 1:1
- Number of A/D Converters:
- 1
- Architecture:
- SAR
- Reference Type:
- External, Internal
- Voltage - Supply, Analog:
- 5V
- Voltage - Supply, Digital:
- 5V
- Features:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 16-MSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC2326IMS-18#PBF FAQ
1.How can I place an order for LTC2326IMS-18#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2326IMS-18#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 LTC2326IMS-18#PBF reliable?
The price and inventory of LTC2326IMS-18#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2326IMS-18#PBF is usually 5 days.
3.What payment methods are accepted for LTC2326IMS-18#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2326IMS-18#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2326IMS-18#PBF?
LTC2326IMS-18#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2326IMS-18#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 LTC2326IMS-18#PBF?
For technical support, including LTC2326IMS-18#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2326IMS-18#PBF requirements.
6.How does Aetrix verify that LTC2326IMS-18#PBF is sourced from the original manufacturer or authorized distributors?
All LTC2326IMS-18#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 LTC2326IMS-18#PBF meets industry standards.
7.What is the process for return or replacement of LTC2326IMS-18#PBF?
All LTC2326IMS-18#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2326IMS-18#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 LTC2326IMS-18#PBF part is unused and in its original packaging.
Return procedure for LTC2326IMS-18#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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