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Analog Devices Inc. LTM2893CY#PBF
- Part No.:
- LTM2893CY#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Digital Isolators
- Package:
- 36-BGA
- Datasheet:
-
LTM2893CY#PBF.pdf
- Description:
- DGTL ISOL 6000VRMS 9CH SPI 36BGA
- Quantity:
- Payment:
- Shipping:
Inventory:117
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Product details
Overview
LTM2893CY#PBF from Analog Devices is a high-speed isolated μModule SPI interface IC optimized for 1Msps, 18-bit SAR ADCs (e.g., LTC2338), providing galvanic isolation of conversion start (CNV→CNV2), busy signaling, and three multiplexer select lines with 30psRMS aperture jitter and 20ns latency. It supports 100MHz SPI I/O, 8–32-bit word lengths, and operates across 1.71V–5.5V logic supplies on both sides.
For engineers reviewing the LTM2893CY#PBF datasheet, LTM2893CY#PBF pinout, LTM2893CY#PBF application, or LTM2893CY#PBF equivalent, key selection criteria include its 6000VRMS isolation rating, low-latency CNV propagation, configurable SPI timing for simultaneous-sampling ADCs, and BGA package compatibility with high-density industrial data acquisition layouts.
Technical Context
The LTM2893CY#PBF implements transformer-based digital isolation using coreless µModule technology, encoding logic-side signals into differential pulses across an integrated isolation barrier with error checking and fail-safe shutdown. Its dual-state machine architecture separately manages ADC read cycles (CNV→BUSY2→MISOA2→MISOA) and optional configuration register access via CSC.
It delivers deterministic timing: CNV→CNV2 delay is 12–33ns (typ. 21ns), aperture jitter is 30psRMS, and SCK2 output period is 10ns at 100MHz. The device supports independent supply domains (VL/VL2 = 1.71–5.5V; VCC/VCC2 = 3.0–5.5V) and tolerates >50kV/µs common-mode transients while maintaining uninterrupted communication.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Isolation Rating | 6000VRMS for 1 minute - enables reinforced insulation per UL 1577 and CSA 60601-1 (2 MOPP) in medical and industrial safety-critical systems. |
| CNV→CNV2 Aperture Jitter | 30psRMS - preserves SNR >95dB in 18-bit ADC systems (e.g., LTC2328-18) by minimizing sampling time uncertainty. |
| SPI Data Rate | 100MHz SCK/SCK2 - supports 1Msps throughput with zero-cycle latency for real-time high-speed data acquisition. |
| Logic Supply Range | VL/VL2 = 1.71V to 5.5V - interoperates with FPGA, MCU, or ASIC I/O banks across 1.8V, 3.3V, and 5V domains without level shifters. |
| Package Dimensions | 15mm × 6.25mm × 2.06mm BGA - compact footprint suitable for space-constrained PCB layouts in test equipment and process controllers. |
| Operating Temperature | 0°C to 70°C (C-grade) - validated for commercial and industrial ambient environments without derating. |
| Common-Mode Immunity | >50kV/µs - ensures robust operation in noisy motor drives or power electronics where ground differentials exceed 1kV. |
Pinout & Package
36-pin BGA (15mm × 6.25mm × 2.06mm), RoHS-compliant SAC305 ball finish, MSL Level 3. Pin mapping validated per Analog Devices LTM2893 Rev C datasheet (pages 8–9).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CNV (A6) | Conversion Start Input | Rising edge triggers isolated CNV2 with 21ns typ. delay and 30psRMS jitter - critical for precise sampling timing in SAR ADCs. |
| BUSY (A5) | ADC Busy Status Output | High indicates ongoing conversion; falling edge signals valid data ready in MISOA/MISOB buffers - synchronizes host read timing. |
| SA/SB/SC (C4–C6) | Isolated Multiplexer Select Inputs | Pass-through control signals to SA2/SB2/SC2 (N4–N6) - enables analog channel/gain switching synchronized with ADC sampling. |
| MISOA/MISOB (B2–B3) | Isolated SPI Data Outputs | Deliver ADC result bits from MISOA2/MISOB2 after BUSY2 fall - support dual-data-stream readout for interleaved or differential ADCs. |
| ON (A1) | Logic-Side Enable Input | Active-high control of MOSI/SCK/CNV/MISOA/MISOB drivers - allows power-gated operation and fault recovery without reset. |
| VCC/VCC2 (C1/N1) | Primary/Isolated Power Supplies | 3.0–5.5V domains power internal isolators and buffers - decoupling with 1µF ceramic required per supply pin per datasheet layout guidelines. |
Key Features
| Feature | Design Value |
|---|---|
| Transformer-Based Isolation | Coreless µModule barrier provides 6000VRMS withstand, 50kV/µs CMTI, and <3pF input-to-output capacitance - eliminates optocoupler latency and aging drift. |
| Configurable SPI Interface | 8–32-bit word length, selectable SCK2 frequency (up to 100MHz), and CRC enable/disable - adapts to diverse ADC families (LTC23xx, LTC234x) without firmware changes. |
| Dual-Mode ADC Support | Read-only mode (LTM2893) for standard SAR ADCs; read/write mode (LTM2893-1 variant) for simultaneous-sampling ADCs requiring configuration writes - same pinout, software-selectable. |
| Three Isolated Select Lines | SA/SB/SC → SA2/SB2/SC2 pass-through with 40–150ns propagation delay - enables synchronized analog front-end control (e.g., mux/gain) aligned to CNV timing. |
| Fault Detection & Recovery | Open-drain FAULT (B6) asserts on SPI buffer under-run, invalid CSC/SS framing, or isolation barrier errors - enables system-level diagnostics and safe shutdown. |
Applications
| Industrial Process Control | Test and Measurement Equipment |
|---|---|
|
Use Scenario: Isolating 18-bit ADCs in PLC analog input modules measuring ±10V sensor signals in 4–20mA loop-powered field devices. IC Role / Device Role / Timing Role: LTM2893CY#PBF acts as the isolated SPI bridge between FPGA controller and LTC2338 ADC, transferring CNV with 30psRMS jitter to maintain 95dB SNR under EMI-rich factory floor conditions. Use Value: Enables direct connection to high-voltage field buses without external level shifters or optocouplers, reducing BOM count and improving long-term reliability. |
Use Scenario: High-speed digitizer card acquiring transient waveforms from oscilloscope front-ends with simultaneous multi-channel sampling. IC Role / Device Role / Timing Role: LTM2893CY#PBF interfaces FPGA to LTC2348 ADC, managing dual SPI transactions (read result + write config) with sub-100ns total latency for 2Msps aggregate throughput. Use Value: Eliminates timing skew between channels caused by discrete isolators, ensuring true simultaneous sampling across 8+ channels. |
| Medical Imaging Signal Chain | Energy Metering with Anti-Tampering |
|
Use Scenario: Isolating precision ADCs in ultrasound beamformer receive paths where signal integrity and low noise are critical. IC Role / Device Role / Timing Role: LTM2893CY#PBF isolates LTC2378-18 ADC outputs while preserving 100dB SNR performance up to 1MHz input frequency via ultra-low-jitter CNV2 timing. Use Value: Meets IEC 60601-1 2-MOPP safety requirements without compromising dynamic range or introducing clock-induced artifacts. |
Use Scenario: Smart electricity meter ADC isolation to prevent high-voltage surges (e.g., lightning strikes) from propagating to microcontroller side. IC Role / Device Role / Timing Role: LTM2893CY#PBF provides 6000VRMS isolation between metrology ADC (LTC2328-18) and energy processing SoC, with fault detection flagging isolation barrier degradation. Use Value: Achieves EN 50470-3 surge immunity compliance while enabling real-time harmonic analysis at 1Msps without latency penalties. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-speed isolated SPI interface applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADUM6401ARWZ | Quad-channel 25Mbps iCoupler isolator with integrated DC/DC; no native SPI protocol handling or CNV jitter optimization. | Requires external logic to manage ADC timing sequences; unsuitable for sub-50ps aperture jitter requirements. | Select only when full custom SPI state machine implementation is acceptable and jitter tolerance >100ps. |
| ISO6741QDWR | Quad-channel 50Mbps capacitive isolator; no integrated SPI buffer, configuration register, or select signal pass-through. | Needs external FPGA logic for BUSY/CNV synchronization and lacks SA/SB/SC routing - increases design complexity and PCB area. | Choose for cost-sensitive, lower-speed (<50Msps) isolation where protocol offload is handled elsewhere. |
Compared with ADUM6401ARWZ and ISO6741QDWR, the LTM2893CY#PBF uniquely integrates ADC-specific timing control, ultra-low-jitter conversion triggering, and three dedicated isolated select lines in a single BGA package - eliminating external glue logic and guaranteeing sub-100ns end-to-end latency for 1Msps 18-bit acquisition.
Availability
LTM2893CY#PBF is available at Aetrix Electronics and suitable for industrial process control, test and measurement equipment, and medical imaging systems requiring stable component supply, long-term lifecycle assurance, and certified 6000VRMS isolation.
Supply support for LTM2893CY#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. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LTM2893CY#PBF belongs to Analog Devices' µModule isolated interface product line, designed specifically to simplify high-fidelity, safety-certified ADC interfacing in noise-immune, space-constrained systems without sacrificing speed or precision.
FAQ
What is the maximum SPI clock frequency supported by the LTM2893CY#PBF?
The LTM2893CY#PBF supports up to 100MHz SCK/SCK2 operation, enabling 1Msps throughput with zero-cycle latency. At this rate, SCK2 period is 10ns (min 9.5ns), and timing parameters like tSCK2H/tSCK2L are guaranteed ≥4ns. Performance is validated across the full 0°C to 70°C temperature range with 20pF load.
Does the LTM2893CY#PBF support simultaneous-sampling ADCs like the LTC2348?
No - the LTM2893CY#PBF is the read-only variant optimized for ADCs such as LTC2338 and LTC2328. For simultaneous-sampling ADCs requiring configuration writes (e.g., LTC2348), the LTM2893CY-1#PBF variant must be used. Both share identical pinout and package but differ in internal firmware and CSC register functionality.
How does the LTM2893CY#PBF achieve 30psRMS aperture jitter on CNV→CNV2?
The LTM2893CY#PBF achieves 30psRMS aperture jitter through transformer-based µModule isolation with precision edge-detection circuitry and matched propagation paths. This is measured directly on CNV2 output under 1.71–5.5V VL/VL2 conditions and is critical for preserving SNR in 18-bit SAR ADCs like LTC2328-18.
What safety certifications apply to the LTM2893CY#PBF?
The LTM2893CY#PBF is UL 1577 certified (File #255632) for 6000VRMS isolation, CSA certified to IEC/UL 60950-1 and 62368-1 (reinforced insulation), and meets IEC 60601-1 for two means of patient protection (2 MOPP) at 287.5VRMS - verified per datasheet Rev C regulatory section.
Can the LTM2893CY#PBF operate with 1.8V logic supplies on both sides?
Yes - the LTM2893CY#PBF supports VL and VL2 from 1.71V to 5.5V, including 1.8V operation. Input thresholds scale as 0.2×VL/0.8×VL, and output drive strength (VOH/VOL) is specified down to 1.71V. Full 100MHz timing compliance is maintained at 1.8V with 20pF load per datasheet Electrical Characteristics table.
LTM2893CY#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 36-BGA
- Packaging:
- Tray
- Product Status:
- Active
- Technology:
- Magnetic Coupling
- Type:
- SPI
- Isolated Power:
- No
- Number of Channels:
- 9
- Inputs - Side 1/Side 2:
- 6/6
- Channel Type:
- Bidirectional, Unidirectional
- Voltage - Isolation:
- 6000Vrms
- Common Mode Transient Immunity (Min):
- 50kV/µs
- Data Rate:
- 100Mbps
- Propagation Delay tpLH / tpHL (Max):
- 150ns, 150ns
- Pulse Width Distortion (Max):
- -
- Rise / Fall Time (Typ):
- 10ns, 10ns
- Voltage - Supply:
- 3V ~ 5.5V
- Grade:
- -
- Qualification:
- -
- Operating Temperature:
- 0°C ~ 70°C
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 36-BGA (15x6.25)
LTM2893CY#PBF FAQ
1.How can I place an order for LTM2893CY#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTM2893CY#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 LTM2893CY#PBF reliable?
The price and inventory of LTM2893CY#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTM2893CY#PBF is usually 5 days.
3.What payment methods are accepted for LTM2893CY#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTM2893CY#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTM2893CY#PBF?
LTM2893CY#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTM2893CY#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 LTM2893CY#PBF?
For technical support, including LTM2893CY#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTM2893CY#PBF requirements.
6.How does Aetrix verify that LTM2893CY#PBF is sourced from the original manufacturer or authorized distributors?
All LTM2893CY#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 LTM2893CY#PBF meets industry standards.
7.What is the process for return or replacement of LTM2893CY#PBF?
All LTM2893CY#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTM2893CY#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 LTM2893CY#PBF part is unused and in its original packaging.
Return procedure for LTM2893CY#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LTM2893CY#PBF Tags
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ISO1212DBQR
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ISO6721BDR
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SI8710AC-B-ISR
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ISO7720FDR
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ISO7721DR
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ISO7721FDR
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SI8710CC-B-ISR
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ISO6741FQDWRQ1
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ISO7721DWVR
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ISO7762FDBQR
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ISO7741DWR
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ISO7741FDWR
Texas Instruments
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