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Analog Devices Inc. LTC2337CMS-18#PBF
- Part No.:
- LTC2337CMS-18#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 16-TFSOP (0.118", 3.00mm Width)
- Datasheet:
-
LTC2337CMS-18#PBF.pdf
- Description:
- IC ADC 18BIT SAR 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,553
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Product details
Overview
LTC2337CMS-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, ±4LSB INL max, and integrated 2.048V low-drift reference. It operates from a single 5V supply and targets high-voltage industrial data acquisition where wide dynamic range and DC accuracy are critical.
For engineers reviewing the LTC2337CMS-18#PBF datasheet, LTC2337CMS-18#PBF pinout, LTC2337CMS-18#PBF application, or LTC2337CMS-18#PBF equivalent, key selection criteria include guaranteed 18-bit no-missing-codes operation, daisy-chain SPI interface compatibility across 1.8V–5V logic, internal conversion clock, nap/sleep power management (35mW / 300μW), and MSOP-16 packaging for space-constrained PCB layouts.
Technical Context
The LTC2337CMS-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 fully differential front-end accepts ±10.24V inputs via resistor-divider networks that level-shift and attenuate to 0–4.096V for the core ADC.
Conversion timing is internally generated (no external clock required), with fixed 1.5µs conversion time and zero cycle latency. The device supports two operational modes: normal mode (RDL/SDI as bus enable) and daisy-chain mode (RDL/SDI as serial data input), both using SPI-compatible 2's complement output with MSB-first timing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 18-bit - guarantees full 262,144-level quantization with no missing codes over temperature. |
| Sampling Rate | 500ksps - enables real-time capture of signals up to ~250kHz Nyquist bandwidth. |
| Input Range | ±10.24V true bipolar - supports direct digitization of industrial sensor outputs without external level-shifting. |
| SNR | 100dB (typ) at 2kHz - delivers 16.3 effective bits (ENOB) for high-fidelity signal reconstruction. |
| INL | ±4LSB (max) - ensures monotonicity and <0.006% full-scale linearity error in precision control loops. |
| Power Dissipation | 35mW (typ) at 500ksps - scales with sample rate via automatic nap mode; drops to 300μW in sleep. |
| Reference | 2.048V internal bandgap (20ppm/°C max drift) buffered to 4.096V - eliminates need for external reference in most applications. |
Pinout & Package
Package: 16-lead plastic MSOP (3mm × 4.9mm, 0.65mm pitch), RoHS-compliant, rated for 0°C to 70°C operation (C-grade).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDDLBYP (1) | 2.5V LDO bypass | Internal regulator output; requires 2.2µF ceramic cap to GND for stable 2.5V rail for analog circuitry. |
| VDD (2) | 5V main supply | Primary analog/digital power (4.75–5.25V); bypassed with 10µF ceramic to GND. |
| GND (3,6,16) | Analog/digital ground | Three dedicated ground pins minimize ground bounce and improve PSRR. |
| IN+, IN– (4,5) | Differential analog inputs | Accept ±10.24V true bipolar signal; input impedance modeled as 2kΩ + 45pF with 50Ω switch RON. |
| REFBUF (7) | Buffered reference output | 4.096V (2×REFIN); decoupled with 47µF ceramic; can be overdriven externally (2.5–5V) when REFIN = 0V. |
| REFIN (8) | Reference output/input | 2.048V bandgap reference; bypassed with 100nF ceramic; accepts 1.25–2.4V external overdrive. |
| CNV (9) | Convert trigger | Rising-edge initiated conversion; powers up ADC and starts acquisition phase. |
| CHAIN (10) | Mode selector | Low = normal mode (RDL/SDI = bus enable); high = daisy-chain mode (RDL/SDI = SDI). |
| BUSY (11) | Conversion status | Active-high open-drain indicator; asserts at CNV↑, deasserts when result ready on SDO. |
| RDL/SDI (12) | Configurable I/O | Function depends on CHAIN state; enables SDO tri-state or accepts daisy-chain input data. |
| SCK (13) | Serial clock input | Accepts 1.8–5V logic; defines SPI timing; supports up to 100MHz (10ns period) for rising-edge capture. |
| SDO (14) | Serial data output | 2's complement 18-bit result; MSB-first; driven only when enabled by RDL/SDI in normal mode. |
| OVDD (15) | I/O supply | Digital interface voltage (1.71–5.25V); sets logic thresholds for all digital pins; bypassed with 0.1µF ceramic. |
Key Features
| Feature | Design Value |
|---|---|
| No pipeline delay | Zero-cycle latency enables deterministic timing for closed-loop control systems requiring immediate feedback. |
| Onboard reference buffer | Single-shot capable 4.096V output eliminates external op-amp buffering and reduces layout sensitivity. |
| Daisy-chain SPI mode | Enables synchronous multi-channel acquisition with single SCK/SCK chain, reducing MCU GPIO count and PCB routing complexity. |
| Auto nap/sleep power management | Reduces average power proportionally to sampling rate; sleep mode cuts quiescent current to 300μW for battery-powered instrumentation. |
| Guaranteed operation to 70°C | Validated performance across full C-grade temperature range ensures reliability in industrial enclosures without forced cooling. |
Applications
| Programmable Logic Controllers | Industrial Process Control |
|---|---|
Use Scenario: Digitizing 4–20mA current loop outputs and ±10V analog sensor signals (e.g., pressure, temperature transmitters) in modular PLC backplanes. IC Role / Device Role / Timing Role: Primary high-resolution ADC interfacing directly to field I/O modules; handles true bipolar inputs without external signal conditioning. Use Value: ±4LSB INL and 100dB SNR ensure sub-0.01% measurement accuracy across 16-bit control resolution, meeting IEC 61000-4 immunity requirements. | Use Scenario: High-speed monitoring of reactor temperatures, flow rates, and valve positions in chemical processing plants with ambient temperatures up to 65°C. IC Role / Device Role / Timing Role: Precision data acquisition node in distributed control system (DCS) field instruments; synchronized via daisy-chain SPI to central controller. Use Value: Integrated 2.048V reference with 20ppm/°C drift maintains calibration stability over plant operating temperature swings, reducing recalibration frequency. |
| High Speed Data Acquisition | Portable Instrumentation |
Use Scenario: 500ksps waveform capture in benchtop oscilloscopes and automated test equipment (ATE) for validating power electronics switching behavior. IC Role / Device Role / Timing Role: Front-end ADC in multi-channel digitizers; leverages internal oscillator and zero-latency conversion for precise time-domain analysis. Use Value: 4ps aperture jitter and 7MHz input bandwidth preserve signal integrity for fast edge measurements, supporting >100MHz equivalent time sampling. | Use Scenario: Battery-powered handheld multimeters and portable power analyzers requiring high DC accuracy and low standby power. IC Role / Device Role / Timing Role: Core ADC in compact form factor designs; uses sleep mode between measurements to extend battery life. Use Value: 300μW sleep current enables >1-year battery operation on coin-cell power; ±10.24V input range eliminates external gain stages, reducing BOM cost and board area. |
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 |
|---|---|---|---|
| AD7606C-18 | 8-channel simultaneous sampling; ±10V input; 225ksps per channel; internal reference 4.096V; 68-pin LQFP | Multi-channel synchronized acquisition; higher channel density but lower throughput per channel | Select for systems needing 8-channel parallel sampling without external multiplexing; not pin-compatible. |
| ADS8860 | 16-bit, 1MSPS; ±5V input; external reference required; 20-pin VSSOP; 15mW typical power | Higher speed but reduced resolution and input range; no integrated reference buffer | Select when 16-bit resolution suffices and external reference design is acceptable; smaller package but lacks true bipolar ±10.24V support. |
Compared with AD7606C-18 and ADS8860, the LTC2337CMS-18#PBF uniquely combines 18-bit resolution, ±10.24V true bipolar input, integrated reference buffer, and daisy-chain capability in a compact MSOP-16 package-making it optimal for single-channel, high-accuracy, space-constrained industrial DAQ nodes.
Availability
LTC2337CMS-18#PBF is available at Aetrix Electronics and suitable for programmable logic controllers, industrial process control systems, and high-speed data acquisition requiring stable component supply, long-term lifecycle support, and guaranteed C-grade temperature performance.
Supply support for LTC2337CMS-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 LTC2337-18 product line was designed by Linear Technology (acquired by ADI in 2017) specifically for high-accuracy, high-voltage industrial data acquisition-emphasizing low noise, true bipolar input flexibility, and robust power management in minimal footprint packages.
FAQ
What is the maximum sampling rate of the LTC2337CMS-18#PBF?
The LTC2337CMS-18#PBF achieves a maximum sampling rate of 500ksps with guaranteed timing and full 18-bit performance. This rate is maintained across the full 0°C to 70°C operating temperature range and does not require external clocking-the internal oscillator sets conversion timing deterministically. At this rate, the device consumes 35mW typical power and delivers 100dB SNR at 2kHz input frequency.
Does the LTC2337CMS-18#PBF require an external reference?
No, the LTC2337CMS-18#PBF includes a factory-trimmed 2.048V internal bandgap reference with ≤20ppm/°C drift and an onboard reference buffer that outputs 4.096V. This eliminates the need for external references in most applications. However, REFIN (Pin 8) accepts 1.25–2.4V external references for improved accuracy, and REFBUF (Pin 7) can be overdriven (2.5–5V) when the internal buffer is disabled-providing design flexibility without compromising the LTC2337CMS-18#PBF's core functionality.
How does the daisy-chain mode work on the LTC2337CMS-18#PBF?
Daisy-chain mode is enabled by pulling CHAIN (Pin 10) high. In this mode, RDL/SDI (Pin 12) becomes a serial data input, allowing multiple LTC2337CMS-18#PBF devices to share one SCK line and be read out sequentially. Each device shifts its 18-bit result into the next during SCK transitions, enabling synchronized multi-channel acquisition with minimal MCU interface overhead-ideal for systems where board space or GPIO count is constrained.
What power-saving features does the LTC2337CMS-18#PBF offer?
The LTC2337CMS-18#PBF features two power-saving states: nap mode automatically engages between conversions, reducing current to 4.6mA (19.5mW), and sleep mode (activated via CNV timing) lowers total supply current to 300μW. Both modes scale with sampling rate, making the LTC2337CMS-18#PBF suitable for battery-powered portable instrumentation while maintaining full specification compliance upon wake-up.
Is the LTC2337CMS-18#PBF pin-compatible with other members of the LTC2337 family?
Yes, all LTC2337-18 variants-including LTC2337IMS-18#PBF (–40°C to 85°C) and LTC2337HMS-18#PBF (–40°C to 125°C)-share identical 16-lead MSOP packaging and pinout. The LTC2337CMS-18#PBF is the C-grade version, differing only in temperature rating and part marking; electrical specifications and interface behavior are functionally identical across grades, enabling drop-in replacement for different environmental requirements.
LTC2337CMS-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:
- 0°C ~ 70°C
- Supplier Device Package:
- 16-MSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC2337CMS-18#PBF FAQ
1.How can I place an order for LTC2337CMS-18#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2337CMS-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 LTC2337CMS-18#PBF reliable?
The price and inventory of LTC2337CMS-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 LTC2337CMS-18#PBF is usually 5 days.
3.What payment methods are accepted for LTC2337CMS-18#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2337CMS-18#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2337CMS-18#PBF?
LTC2337CMS-18#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2337CMS-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 LTC2337CMS-18#PBF?
For technical support, including LTC2337CMS-18#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2337CMS-18#PBF requirements.
6.How does Aetrix verify that LTC2337CMS-18#PBF is sourced from the original manufacturer or authorized distributors?
All LTC2337CMS-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 LTC2337CMS-18#PBF meets industry standards.
7.What is the process for return or replacement of LTC2337CMS-18#PBF?
All LTC2337CMS-18#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2337CMS-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 LTC2337CMS-18#PBF part is unused and in its original packaging.
Return procedure for LTC2337CMS-18#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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