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Analog Devices Inc. LTC2369HMS-18#PBF
- Part No.:
- LTC2369HMS-18#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 16-TFSOP (0.118", 3.00mm Width)
- Datasheet:
-
LTC2369HMS-18#PBF.pdf
- Description:
- IC ADC 18BIT SAR 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,557
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Product details
Overview
LTC2369HMS-18#PBF from Analog Devices (formerly Linear Technology) is an 18-bit, 1.6 Msps pseudo-differential unipolar successive approximation register (SAR) ADC operating from a single 2.5 V supply. It delivers 96.5 dB SNR (typ), ±2.5 LSB INL (max), and guaranteed no missing codes across its 0 V to VREF input range (VREF = 2.5 V to 5.1 V), targeting high-precision, high-speed data acquisition in harsh thermal environments.
For engineers reviewing the LTC2369HMS-18#PBF datasheet, LTC2369HMS-18#PBF pinout, LTC2369HMS-18#PBF application, or LTC2369HMS-18#PBF equivalent, key selection criteria include H-grade temperature operation (–40°C to 125°C), SPI-compatible daisy-chain interface with 1.8 V–5 V I/O support, internal conversion clock, and low 18 mW power consumption at full throughput-critical for portable instrumentation and industrial control systems.
Technical Context
The LTC2369HMS-18#PBF implements a charge-redistribution SAR architecture with a 18-bit CDAC and differential comparator, sampling the pseudo-differential IN+/IN– inputs during acquisition and executing binary-weighted voltage comparisons against VREF/2n during conversion. Its internal oscillator eliminates external timing dependencies, and auto power-down between conversions scales current draw with sampling rate.
It supports two operational modes via the CHAIN pin: normal mode (RDL/SDI as bus enable) and daisy-chain mode (RDL/SDI as serial data input). The analog front-end features 45 pF input capacitance in sample mode, 40 Ω switch on-resistance, and ±100 mV common-mode range on IN–, enabling robust rejection of ground noise in sensor interfaces.
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 | 1.6 Msps-enables real-time capture of signals up to 34 MHz input bandwidth without pipeline latency. |
| SNR | 96.5 dB (typ) at fIN = 2 kHz, VREF = 5 V-supports >15.7 effective number of bits (ENOB) in precision measurement. |
| INL | ±2.5 LSB (max) over –40°C to 125°C-ensures accurate end-point linearity for calibration-critical applications. |
| Power Consumption | 18 mW at 1.6 Msps, 18 μW at 1.6 ksps-enables battery-operated designs with dynamic power scaling. |
| Reference Range | VREF = 2.5 V to 5.1 V-allows flexible full-scale adjustment while maintaining 19 μV LSB (at 5 V). |
| Temperature Range | –40°C to +125°C (H-grade)-qualified for under-hood automotive, downhole oil & gas, and industrial process control. |
Pinout & Package
Package: 16-lead plastic MSOP (3 mm × 4.9 mm), exposed pad not present (DFN variant has exposed GND pad; MSOP does not). Pin 17 is absent in MSOP; all GND pins (3, 6, 10, 16) must be connected to system ground plane.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CHAIN (1) | Mode select input | High enables daisy-chain mode (RDL/SDI becomes SDI); low enables normal mode (RDL/SDI acts as SDO bus enable). |
| VDD (2) | Analog supply | 2.5 V ±62.5 mV supply; powers core ADC and reference buffer; requires 10 μF ceramic bypass to GND. |
| GND (3, 6, 10, 16) | Analog/digital ground | Four dedicated ground connections minimize ground bounce and improve PSRR; all must be low-impedance. |
| IN+ (4) | Pseudo-differential analog input (+) | Accepts 0 V to VREF signal; sampled via 45 pF capacitor and 40 Ω switch; requires low-impedance drive. |
| IN– (5) | Pseudo-differential analog input (–) | Common-mode sense node; ±100 mV range relative to GND; ties to remote ground or local ground plane. |
| REF (7, 8) | Reference voltage input | Dual-pin connection for 2.5 V–5.1 V external reference; requires 47 μF X5R ceramic decoupling at pin. |
| CNV (9) | Convert trigger input | Rising-edge–initiated conversion start; powers up ADC and begins acquisition phase; OVDD-referenced logic. |
| BUSY (11) | Conversion status indicator | Active-high open-drain output signaling conversion in progress; used for timing synchronization or interrupt. |
| RDL/SDI (12) | Serial interface control/data input | Function depends on CHAIN state; in chain mode, accepts MSB-first daisy-chain data from upstream ADC. |
| SCK (13) | Serial clock input | OVDD-referenced clock driving SDO output; supports up to 100 MHz (10 ns period); defines data valid timing. |
| SDO (14) | Serial data output | MSB-first straight-binary output; tri-state controlled by RDL/SDI in normal mode; active during SCK rising edges. |
| OVDD (15) | I/O supply voltage | 1.71 V–5.25 V digital interface supply; sets logic thresholds for all digital pins; bypass with 0.1 μF ceramic. |
Key Features
| Feature | Design Value |
|---|---|
| No cycle latency | Immediate data availability after BUSY deassertion-eliminates pipelining delays critical for closed-loop control. |
| Internal conversion clock | Removes need for external timing circuitry or master clock synchronization-reduces BOM count and layout complexity. |
| Auto power-down | Reduces current to 0.9 μA (H-grade) between conversions-enables ultra-low average power in burst-sampling systems. |
| 1.8 V–5 V I/O compatibility | Single OVDD supply interfaces directly with 1.8 V FPGA, 3.3 V microcontroller, or 5 V legacy logic-no level shifters required. |
| Pseudo-differential input architecture | Rejects common-mode noise on IN– while preserving full unipolar dynamic range on IN+-ideal for noisy industrial sensor nodes. |
Applications
| Medical Imaging Signal Chain | Industrial Process Controller ADC |
|---|---|
|
Use Scenario: Digitizing low-amplitude, high-frequency ultrasound echo signals in portable imaging devices requiring high SNR and thermal stability. IC Role / Device Role / Timing Role: Primary high-speed data converter capturing analog beamformer outputs with minimal added noise or distortion. Use Value: 96.5 dB SNR and –120 dB THD preserve weak tissue reflection details; H-grade rating ensures consistent performance during extended field use. |
Use Scenario: Monitoring multi-channel analog sensor inputs (pressure, temperature, flow) in PLC-based factory automation systems operating in hot enclosures. IC Role / Device Role / Timing Role: Precision analog-to-digital front-end for real-time closed-loop feedback control with deterministic 625 ns conversion cycle time. Use Value: ±2.5 LSB INL and –40°C to 125°C operation maintain calibration integrity across ambient extremes; daisy-chain mode simplifies multi-channel board layout. |
| Portable Battery-Powered Test Equipment | High-Speed ATE Channel |
|
Use Scenario: Handheld oscilloscopes or spectrum analyzers where battery life and measurement fidelity are equally critical. IC Role / Device Role / Timing Role: Core ADC delivering 18-bit resolution at 1.6 Msps while minimizing system power budget via adaptive power-down. Use Value: 18 mW at full speed and 18 μW in idle extend runtime; 1.6 Msps throughput captures transients without aliasing in sub-1 MHz bandwidth instruments. |
Use Scenario: Production-line automated test equipment requiring synchronized, high-accuracy digitization of DUT outputs across multiple channels. IC Role / Device Role / Timing Role: High-fidelity acquisition node in parallel or daisy-chained configuration for simultaneous multi-site testing. Use Value: Guaranteed no missing codes and 96.5 dB SNR ensure pass/fail decisions meet metrology-grade repeatability; SPI daisy-chain reduces controller GPIO count. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-speed SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7960BCPZ-RL7 | 18-bit, 5 Msps, 2.5 V supply, but requires external reference and separate VIO supply; no integrated daisy-chain mode. | Higher throughput suits wider bandwidth applications, but increased layout complexity and power (39 mW) limit portability. | Select when >1.6 Msps is mandatory and external timing/control infrastructure is available. |
| LTC2378-18#PBF | 18-bit, 1 Msps, same H-grade temp range and pin-compatible MSOP package, but lower SNR (95.5 dB typ) and no daisy-chain capability. | Lower cost and power (15 mW), but reduced dynamic range and missing daisy-chain limits scalability in multi-ADC systems. | Select for cost-sensitive, single-channel applications where 1 Msps suffices and daisy-chain is unnecessary. |
Compared with AD7960BCPZ-RL7 and LTC2378-18#PBF, the LTC2369HMS-18#PBF uniquely balances 1.6 Msps speed, integrated daisy-chain, ultra-low power, and guaranteed H-grade performance-making it optimal for thermally constrained, multi-channel, battery-aware precision acquisition.
Availability
LTC2369HMS-18#PBF is available at Aetrix Electronics and suitable for medical imaging signal chains, industrial process controllers, portable test equipment, and high-speed ATE requiring stable component supply across extended temperature ranges.
Supply support for LTC2369HMS-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. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and digital signal processing ICs, serving industrial, automotive, communications, and healthcare markets.
The LTC2369HMS-18#PBF belongs to Linear's precision SAR ADC product line, engineered for applications demanding high resolution, low noise, and robust operation in extreme thermal environments-especially where size, power, and deterministic timing are critical.
FAQ
What is the maximum operating temperature of the LTC2369HMS-18#PBF?
The LTC2369HMS-18#PBF is rated for continuous operation from –40°C to +125°C (H-grade), with full electrical specifications guaranteed across this range-including SNR, INL, and power consumption. This makes LTC2369HMS-18#PBF suitable for under-hood automotive sensors, downhole tools, and industrial motor drives where ambient temperatures exceed 100°C.
Does the LTC2369HMS-18#PBF require an external reference?
Yes, the LTC2369HMS-18#PBF requires an external reference applied to the REF pins (7 and 8). It supports VREF from 2.5 V to 5.1 V and draws up to 1.1 mA DC current at 1.6 Msps. For optimal performance, Analog Devices recommends the LTC6655-5 low-noise, low-drift reference, especially in H-grade applications where temperature coefficient stability is critical.
How does the daisy-chain mode work on the LTC2369HMS-18#PBF?
Daisy-chain mode is enabled by driving the CHAIN pin (1) high. In this mode, RDL/SDI (12) becomes a serial data input accepting MSB-first data from the SDO of an upstream LTC2369HMS-18#PBF, while SDO (14) outputs the local conversion result. This allows multiple LTC2369HMS-18#PBF devices to share one SCK and CNV line, reducing controller resource usage in multi-channel systems.
What is the minimum acquisition time required for the LTC2369HMS-18#PBF?
The LTC2369HMS-18#PBF specifies a minimum acquisition time (tACQ) of 200 ns, defined as tCYC – tCONV – tBUSYLH. With a maximum conversion time (tCONV) of 412 ns and cycle time (tCYC) of 625 ns, this leaves exactly 200 ns for the input signal to settle on the internal sampling capacitor-requiring a low-impedance driver like the LT6202 to meet this spec reliably.
Can the LTC2369HMS-18#PBF operate with a 1.8 V OVDD supply?
Yes, the LTC2369HMS-18#PBF supports OVDD from 1.71 V to 5.25 V, including 1.8 V logic levels. At 1.8 V OVDD, VIH is 1.44 V (0.8 × OVDD) and VIL is 0.36 V (0.2 × OVDD), ensuring compatibility with modern low-voltage FPGAs and microcontrollers. All digital timing parameters-including tSCK, tSCKH, and tDSDO-are tested and guaranteed across this full OVDD range.
LTC2369HMS-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):
- 1.6M
- 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
- Voltage - Supply, Analog:
- 2.375V ~ 2.625V
- Voltage - Supply, Digital:
- 2.375V ~ 2.625V
- Features:
- -
- Operating Temperature:
- -40°C ~ 125°C
- Supplier Device Package:
- 16-MSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC2369HMS-18#PBF FAQ
1.How can I place an order for LTC2369HMS-18#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2369HMS-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 LTC2369HMS-18#PBF reliable?
The price and inventory of LTC2369HMS-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 LTC2369HMS-18#PBF is usually 5 days.
3.What payment methods are accepted for LTC2369HMS-18#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2369HMS-18#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2369HMS-18#PBF?
LTC2369HMS-18#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2369HMS-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 LTC2369HMS-18#PBF?
For technical support, including LTC2369HMS-18#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2369HMS-18#PBF requirements.
6.How does Aetrix verify that LTC2369HMS-18#PBF is sourced from the original manufacturer or authorized distributors?
All LTC2369HMS-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 LTC2369HMS-18#PBF meets industry standards.
7.What is the process for return or replacement of LTC2369HMS-18#PBF?
All LTC2369HMS-18#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2369HMS-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 LTC2369HMS-18#PBF part is unused and in its original packaging.
Return procedure for LTC2369HMS-18#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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