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Analog Devices Inc. LTC2337IMS-18#PBF
- Part No.:
- LTC2337IMS-18#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 16-TFSOP (0.118", 3.00mm Width)
- Datasheet:
-
LTC2337IMS-18#PBF.pdf
- Description:
- IC ADC 18BIT SAR 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,489
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Product details
Overview
LTC2337IMS-18#PBF from Analog Devices (formerly Linear Technology) is an 18-bit, 500ksps successive approximation register (SAR) analog-to-digital converter with fully differential, true bipolar ±10.24V inputs, 100dB SNR (typ), ±4LSB INL (max), and integrated 2.048V low-drift reference. It operates from a single 5V supply and targets high-voltage industrial data acquisition requiring wide dynamic range and precision.
For engineers reviewing the LTC2337IMS-18#PBF datasheet, LTC2337IMS-18#PBF pinout, LTC2337IMS-18#PBF application, or LTC2337IMS-18#PBF equivalent, key selection considerations include guaranteed 18-bit no-missing-codes operation, daisy-chain SPI interface compatibility across 1.8V–5V logic, internal oscillator timing, nap/sleep power management (35mW / 300μW), and –40°C to 85°C industrial temperature rating.
Technical Context
The LTC2337IMS-18#PBF implements a charge redistribution SAR architecture with a 45pF sampling capacitor and 50Ω switch on-resistance, enabling 7MHz –3dB input linear bandwidth and 4ps aperture jitter. Its differential input stage uses resistor divider networks (2kΩ total impedance) to level-shift ±2.5×REFBUF signals to the ADC core's 0–REFBUF range.
Conversion is initiated by a rising edge on CNV, with fixed 1.5µs conversion time and zero cycle latency. The onboard 2.048V bandgap reference (20ppm/°C max drift) feeds a gain-of-2 buffer delivering 4.096V to REFBUF, supporting ±10.24V full-scale input range. SPI serial output is 2's complement, MSB-first, with configurable RDL/SDI functionality in normal vs. daisy-chain mode.
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 | 500ksps - enables real-time capture of signals up to ~200kHz Nyquist bandwidth without undersampling. |
| SNR | 100dB (typ at fIN = 2kHz, ±10.24V range) - supports >16.5 effective number of bits (ENOB) for high-fidelity measurement. |
| INL | ±4LSB (max) - ensures <0.015% full-scale linearity error critical for calibration-sensitive instrumentation. |
| Input Range | True bipolar ±10.24V differential - accommodates legacy industrial sensor outputs without external level-shifting. |
| Power Dissipation | 35mW (typ at 500ksps), 300μW (sleep mode) - scales with sample rate via automatic nap mode, reducing thermal load in compact systems. |
| Reference | Integrated 2.048V bandgap (20ppm/°C max drift) with buffered 4.096V output - eliminates need for external reference in most applications. |
| Temperature Range | –40°C to +85°C - qualified for industrial process control and PLC environments with extended thermal cycling. |
Pinout & Package
Package: 16-lead plastic MSOP (3mm × 4.9mm, 0.65mm pitch), RoHS-compliant, moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD (Pin 2) | Main analog power supply | 5V ±2.5% input; powers ADC core and internal LDO generating VDDLBYP; requires 10µF ceramic bypass to GND. |
| IN+, IN– (Pins 4, 5) | Differential analog inputs | Accept ±10.24V true bipolar signal; input impedance modeled as 2kΩ resistor divider + 45pF capacitance; ESD clamped. |
| REFBUF (Pin 7) | Buffered reference output | Nominally 4.096V (2×REFIN); supplies ADC reference; must be decoupled with ≥47µF ceramic capacitor for stability. |
| REFIN (Pin 8) | Internal reference output / external reference input | 2.048V bandgap output (bypass with 100nF); accepts 1.25V–2.4V external reference to scale input range. |
| CNV (Pin 9) | Convert trigger input | Rising-edge–sensitive; initiates acquisition and conversion; logic levels referenced to OVDD. |
| CHAIN (Pin 10) | Mode select for serial interface | Low = normal mode (RDL/SDI = bus enable); high = daisy-chain mode (RDL/SDI = SDI input). |
| BUSY (Pin 11) | Conversion status indicator | Active-high open-drain output; asserts at CNV↑, deasserts when result ready on SDO. |
| RDL/SDI (Pin 12) | Configurable serial I/O | Function depends on CHAIN state; in chain mode, receives serial data from upstream ADC in daisy chain. |
| SCK (Pin 13) | Serial clock input | Accepts 10ns min period (≤100MHz); controls timing of SDO data shifts; logic levels referenced to OVDD. |
| SDO (Pin 14) | Serial data output | 2's complement, MSB-first; driven during SCK rising edges; supports daisy-chain readout of multiple devices. |
| OVDD (Pin 15) | Digital I/O supply | 1.71V–5.25V logic interface supply; sets voltage thresholds for all digital pins; bypass with 0.1µF ceramic. |
| GND (Pins 3, 6, 16) | Analog/digital ground | Three dedicated ground pins minimize ground bounce; require low-inductance connection to system ground plane. |
Key Features
| Feature | Design Value |
|---|---|
| No pipeline delay, zero cycle latency | Enables deterministic real-time control loops - conversion result available immediately after BUSY deasserts, no FIFO buffering. |
| Onboard single-shot capable reference buffer | Eliminates external op-amp buffer requirement; supports fast wake-up (<200ms) and stable settling for burst-mode acquisition. |
| SPI-compatible interface with daisy-chain mode | Reduces host GPIO count and PCB routing complexity in multi-channel systems; supports synchronous readout of up to 16 devices. |
| Automatic nap mode between conversions | Reduces average power proportionally to sampling rate - e.g., 100ksps operation draws ~7mA instead of 8.5mA continuous. |
| Guaranteed operation to 85°C (I-grade) | Validated performance across full industrial temperature range without derating - critical for uncooled PLC and ATE enclosures. |
| ±10.24V true bipolar input range | Directly interfaces with ±10V industrial sensors (e.g., strain gauges, RTD transmitters) without external signal conditioning circuitry. |
Applications
| Programmable Logic Controllers | Industrial Process Control |
|---|---|
|
Use Scenario: Digitizing 4–20mA current loop outputs and ±10V analog sensor signals in modular I/O modules. IC Role / Device Role / Timing Role: Primary high-resolution ADC for analog input cards; synchronized to backplane clock via CNV edge triggering. Use Value: ±4LSB INL and 100dB SNR ensure accurate closed-loop control of valves, actuators, and flow meters under EMI-rich factory conditions. |
Use Scenario: High-speed monitoring of reactor temperature, pressure, and chemical concentration in distributed control systems (DCS). IC Role / Device Role / Timing Role: Front-end SAR ADC in isolated analog input channels; leverages nap mode to reduce thermal drift during idle periods. Use Value: True bipolar ±10.24V input range directly accepts standard industrial transducer outputs, eliminating level-shifting components and associated errors. |
| High Speed Data Acquisition | Portable or Compact Instrumentation |
|
Use Scenario: 500ksps waveform capture in benchtop oscilloscopes and spectrum analyzers with 16+ ENOB resolution. IC Role / Device Role / Timing Role: Core digitizer in multi-channel acquisition boards; uses internal oscillator to eliminate external clock routing and jitter coupling. Use Value: 4ps aperture jitter and 7MHz input bandwidth preserve signal integrity for FFT-based analysis up to 200kHz fundamental frequency. |
Use Scenario: Battery-powered handheld multimeters and portable power quality analyzers requiring precision and low power. IC Role / Device Role / Timing Role: Low-power ADC subsystem; enters 300μW sleep mode between manual trigger events or scheduled measurements. Use Value: 35mW active power and automatic nap mode extend battery life while maintaining 18-bit resolution for calibration-grade measurements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-speed, high-resolution SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7606C-18 (Analog Devices) | 8-channel simultaneous sampling, ±10V input, 200ksps per channel, internal reference, parallel + SPI interface | Better suited for multi-sensor synchronized capture; lower throughput per channel but higher channel density | Select when simultaneous sampling across ≥2 channels is required; avoid if single-channel 500ksps speed is mandatory |
| ADS8860 (Texas Instruments) | 16-bit, 1MSPS, ±VREF input, external reference only, no internal buffer, 2.5V–5V supply, 10MSOP package | Higher speed but lower resolution and no integrated reference; requires external op-amp and reference design | Select when >500ksps is needed and 16-bit resolution suffices; avoid if ±10.24V bipolar range or reference integration is required |
Compared with AD7606C-18 and ADS8860, the LTC2337IMS-18#PBF uniquely delivers 500ksps 18-bit performance with integrated ±10.24V bipolar input scaling and reference buffer in a compact MSOP, making it optimal for space-constrained, single-channel industrial DAQ where resolution and ease of use outweigh channel count or raw speed.
Availability
LTC2337IMS-18#PBF is available at Aetrix Electronics and suitable for programmable logic controllers, industrial process control systems, and high-speed data acquisition equipment requiring stable component supply, long-term manufacturability, and guaranteed industrial temperature operation.
Supply support for LTC2337IMS-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 semiconductors, formed through the acquisition of Linear Technology in 2017.
The LTC2337IMS-18#PBF belongs to ADI's precision SAR ADC product line, engineered specifically for industrial and instrumentation applications demanding high DC accuracy, AC performance, and robust operation in harsh environments.
FAQ
What is the maximum sampling rate of the LTC2337IMS-18#PBF?
The LTC2337IMS-18#PBF achieves a guaranteed maximum sampling rate of 500ksps across its full operating temperature range (–40°C to +85°C). This rate is supported by a fixed 1.5µs conversion time and zero cycle latency, enabling deterministic timing for real-time control applications without pipeline delays.
Does the LTC2337IMS-18#PBF require an external reference?
No, the LTC2337IMS-18#PBF includes a factory-trimmed 2.048V internal bandgap reference with ≤20ppm/°C drift and an integrated gain-of-2 reference buffer delivering 4.096V to REFBUF. This enables direct ±10.24V bipolar operation without external components, though REFIN can be overdriven (1.25V–2.4V) for enhanced accuracy.
How does the nap mode function in the LTC2337IMS-18#PBF?
The LTC2337IMS-18#PBF automatically enters nap mode between conversions, reducing IVDD + IOVDD current from 8.5mA (active) to 4.6mA (nap) at 500ksps. This dynamic power scaling lowers average dissipation and thermal drift, particularly beneficial in thermally constrained industrial enclosures and battery-powered instruments.
Can the LTC2337IMS-18#PBF interface with 1.8V microcontrollers?
Yes, the LTC2337IMS-18#PBF supports 1.8V, 2.5V, 3.3V, and 5V logic levels via its OVDD supply pin. All digital I/O pins (CNV, BUSY, SCK, SDO, RDL/SDI, CHAIN) are referenced to OVDD, allowing seamless interoperability with low-voltage hosts without level shifters.
What package type is used for the LTC2337IMS-18#PBF?
The LTC2337IMS-18#PBF is housed in a 16-lead plastic MSOP package (3mm × 4.9mm, 0.65mm pitch) with exposed pad option not specified. This compact, surface-mount footprint supports high-density PCB layouts in space-constrained industrial and portable instrumentation designs.
LTC2337IMS-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):
- 500k
- Number of Inputs:
- 1
- Input Type:
- 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:
- -
LTC2337IMS-18#PBF FAQ
1.How can I place an order for LTC2337IMS-18#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2337IMS-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 LTC2337IMS-18#PBF reliable?
The price and inventory of LTC2337IMS-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 LTC2337IMS-18#PBF is usually 5 days.
3.What payment methods are accepted for LTC2337IMS-18#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2337IMS-18#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2337IMS-18#PBF?
LTC2337IMS-18#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2337IMS-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 LTC2337IMS-18#PBF?
For technical support, including LTC2337IMS-18#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2337IMS-18#PBF requirements.
6.How does Aetrix verify that LTC2337IMS-18#PBF is sourced from the original manufacturer or authorized distributors?
All LTC2337IMS-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 LTC2337IMS-18#PBF meets industry standards.
7.What is the process for return or replacement of LTC2337IMS-18#PBF?
All LTC2337IMS-18#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2337IMS-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 LTC2337IMS-18#PBF part is unused and in its original packaging.
Return procedure for LTC2337IMS-18#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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