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Analog Devices Inc. LTC2378IDE-20#PBF
- Part No.:
- LTC2378IDE-20#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 16-WFDFN Exposed Pad
- Datasheet:
-
LTC2378IDE-20#PBF.pdf
- Description:
- IC ADC 20BIT SAR 16DFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,682
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Product details
Overview
LTC2378IDE-20#PBF from Analog Devices (formerly Linear Technology) is a 20-bit, 1 Msps successive approximation register (SAR) analog-to-digital converter with ±0.5 ppm typical integral nonlinearity, 104 dB SNR at 2 kHz, and digital gain compression (DGC) for single-supply amplifier interfacing. It operates from a 2.5 V analog supply, supports ±VREF differential input range (2.5 V to 5.1 V), and delivers no missing codes across full 20-bit resolution - ideal for high-precision medical imaging and portable instrumentation.
For engineers reviewing the LTC2378IDE-20#PBF datasheet, LTC2378IDE-20#PBF pinout, LTC2378IDE-20#PBF application, or LTC2378IDE-20#PBF equivalent, key selection considerations include guaranteed 20-bit monotonicity over –40°C to +85°C, daisy-chain SPI interface compatibility with 1.8 V–5 V I/O, internal conversion clock eliminating external timing constraints, and DGC-enabled 0.5 V to 4.5 V input range with 5 V reference.
Technical Context
The LTC2378IDE-20#PBF implements a fully differential SAR architecture with a 20-bit charge redistribution capacitor DAC and high-speed comparator. Its conversion cycle is internally clocked (675 ns max), requires no pipeline delay or cycle latency, and features automatic power-down between conversions to scale dissipation with sampling rate - 21 mW at 1 Msps, 21 µW at 1 ksps.
Digital Gain Compression (DGC) is implemented via configurable REF/DGC pin logic: when grounded, it digitally remaps zero-scale from 0 V to 0.1·VREF and full-scale from VREF to 0.9·VREF, enabling rail-to-rail amplifier operation from a single 5.5 V supply while preserving full 20-bit resolution and ±2 ppm INL maximum performance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 20-bit SAR ADC with guaranteed no missing codes - ensures monotonic response for precision measurement systems. |
| Sampling Rate | 1 Msps maximum throughput with zero cycle latency - enables real-time capture of fast transients without data gaps. |
| INL | ±0.5 ppm typical, ±2 ppm maximum over temperature - supports sub-ppm system-level calibration in metrology-grade applications. |
| SNR | 104 dB typical at fIN = 2 kHz, VREF = 5 V - delivers >16.9 effective number of bits (ENOB) for high-fidelity signal acquisition. |
| Power Consumption | 21 mW at 1 Msps, 21 µW at 1 ksps - enables battery-powered operation with dynamic power scaling. |
| Reference Range | 2.5 V to 5.1 V external reference - allows flexible trade-off between input range and LSB size (9.5 µV at 5 V). |
| Digital Interface | SPI-compatible serial I/O with daisy-chain mode, 1.8 V–5 V OVDD support - simplifies multi-ADC synchronization without level shifters. |
Pinout & Package
Package: 16-lead (4 mm × 3 mm) plastic DFN with exposed pad (Pin 17 = GND). Rated for –40°C to +85°C industrial temperature range.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CHAIN (1) | Mode selector | Low = normal SPI bus enable (RDL/SDI controls SDO); high = daisy-chain mode (RDL/SDI becomes SDI input). |
| VDD (2) | Analog supply | 2.5 V ±62.5 mV supply for core ADC; bypass with 10 µF ceramic capacitor to GND. |
| GND (3,6,10,16) | Ground reference | Four dedicated ground pins minimize ground bounce; exposed pad (Pin 17) must be soldered to PCB ground plane. |
| IN+, IN– (4,5) | Differential analog inputs | ±VREF input range; 45 pF sample capacitance, 40 Ω switch RON; require matched low-Z drive (10–50 Ω recommended). |
| REF (7) | Reference voltage input | 2.5 V–5.1 V external reference; decouple with 47 µF X7R ceramic (1210, 10 V). |
| REF/DGC (8) | DGC control | Tied to GND = DGC enabled (0.1–0.9·VREF input range); tied to REF = DGC disabled (±VREF full range). |
| CNV (9) | Convert trigger | Rising edge initiates conversion and powers up ADC; synchronous with BUSY assertion. |
| BUSY (11) | Conversion status | Active-high open-drain output indicating conversion in progress; used for timing or interrupt-driven readout. |
| RDL/SDI (12) | Serial control/data input | Function depends on CHAIN state; in chain mode, accepts MSB-first daisy-chain data from upstream ADC. |
| SCK (13) | Serial clock | Up to 100 MHz SCK (10 ns period); rising edge clocks out 20-bit 2's complement data on SDO. |
| SDO (14) | Serial data output | MSB-first 20-bit 2's complement result; tri-state controlled by RDL/SDI in normal mode. |
| OVDD (15) | I/O supply | 1.71 V–5.25 V digital interface supply; sets logic thresholds; bypass with 0.1 µF ceramic. |
Key Features
| Feature | Design Value |
|---|---|
| Digital Gain Compression (DGC) | Eliminates need for negative supply in front-end amplifiers by mapping full-scale input to 0.1–0.9·VREF, preserving 20-bit resolution and ±2 ppm INL. |
| No Pipeline Delay | Zero-cycle-latency conversion enables deterministic timing for closed-loop control and real-time signal processing. |
| Internal Conversion Clock | Removes dependency on external clock source or PLL; simplifies layout and reduces jitter-sensitive timing paths. |
| Auto Power-Down | Reduces current to 21 µA at 1 ksps - cuts power by 1000× versus full-rate operation without firmware intervention. |
| Wide I/O Voltage Support | 1.8 V–5 V OVDD compatibility allows direct interfacing with FPGA, MCU, or DSP I/O banks without level translation. |
Applications
| Medical Imaging | High-Speed Data Acquisition |
|---|---|
Use Scenario: Digitizing low-noise CT/MRI detector signals with wide dynamic range and minimal harmonic distortion. IC Role / Device Role / Timing Role: Primary 20-bit SAR ADC capturing analog sensor outputs at up to 1 Msps with <104 dB SNR and –125 dB THD. Use Value: Enables detection of sub-millivolt contrast variations in high-resolution tomographic reconstruction without post-processing correction. | Use Scenario: Real-time waveform capture in automated test equipment (ATE) requiring guaranteed monotonicity and low latency. IC Role / Device Role / Timing Role: High-fidelity digitizer with zero-cycle-latency conversion and daisy-chain capability for synchronized multi-channel sampling. Use Value: Eliminates inter-channel skew and missing-code artifacts in production test fixtures, reducing false-fail rates. |
| Portable Instrumentation | Industrial Process Control |
Use Scenario: Battery-powered handheld analyzers measuring pH, conductivity, or gas concentration with microvolt-level stability. IC Role / Device Role / Timing Role: Low-power 20-bit ADC operating at variable sample rates (1 ksps–1 Msps) with auto power-down between conversions. Use Value: Extends battery life beyond 24 hours while maintaining 16.9 ENOB and ±2 ppm INL over –40°C to +85°C. | Use Scenario: Precision monitoring of temperature, pressure, and flow sensors in distributed control systems with long-term drift requirements. IC Role / Device Role / Timing Role: High-stability ADC with <±0.5 ppm INL drift and integrated DGC for single-supply sensor signal conditioning. Use Value: Reduces calibration frequency and eliminates dual-rail op-amps, lowering BOM cost and board space in field-mounted nodes. |
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 |
|---|---|---|---|
| ADS127L11IRHBT | 24-bit delta-sigma ADC, 400 kSPS max, 110 dB SNR, external clock required, no DGC function. | Higher resolution but lower speed; suited for DC/low-frequency precision sensing, not high-speed transient capture. | Select when ultra-low noise (<1 µVPP) at <10 kHz is prioritized over speed and DGC-enabled single-supply simplicity. |
| AD7960BCPZ-RL7 | 18-bit SAR ADC, 5 MSPS, ±1.25 ppm INL, 96 dB SNR, 3.3 V supply only, no DGC, requires external reference buffer. | Higher speed but lower resolution and INL; lacks DGC and wide reference voltage flexibility (2.5–5.1 V). | Select when >1 MSPS throughput is mandatory and 18-bit resolution with ±1.25 ppm INL suffices for the application. |
Compared with ADS127L11IRHBT and AD7960BCPZ-RL7, the LTC2378IDE-20#PBF uniquely balances 20-bit resolution, 1 Msps speed, ±0.5 ppm INL, and DGC - making it optimal for portable, battery-constrained systems needing both precision and single-supply analog front-end simplification.
Availability
LTC2378IDE-20#PBF is available at Aetrix Electronics and suitable for medical imaging, portable instrumentation, and industrial process control requiring stable component supply with guaranteed –40°C to +85°C operation and long-term traceability.
Supply support for LTC2378IDE-20#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 LTC2378-20 product line was designed by Linear Technology (acquired by ADI in 2017) to deliver metrology-grade 20-bit SAR ADC performance with ultra-low power, integrated DGC, and robust industrial temperature operation - targeting portable, high-accuracy data acquisition systems.
FAQ
What is the operating temperature range for the LTC2378IDE-20#PBF?
The LTC2378IDE-20#PBF is rated for –40°C to +85°C, matching the "I" grade specification. This industrial temperature range is validated across all electrical parameters including INL (±2 ppm max), SNR (104 dB typ), and power consumption (21 mW at 1 Msps), ensuring reliable operation in harsh environments such as factory floors or field-deployed instrumentation where thermal stability is critical. The DFN package's exposed pad enhances thermal dissipation under continuous full-rate operation.
How does Digital Gain Compression (DGC) work in the LTC2378IDE-20#PBF?
Digital Gain Compression in the LTC2378IDE-20#PBF is activated by grounding the REF/DGC pin (Pin 8). When enabled, the ADC digitally remaps its transfer function so that zero-scale corresponds to 0.1·VREF and full-scale to 0.9·VREF, effectively compressing the usable input range to 0.5 V–4.5 V with a 5 V reference. This preserves full 20-bit resolution and ±2 ppm INL while allowing the driving amplifier to operate from a single 5.5 V supply - eliminating the need for a negative rail and simplifying front-end design.
Does the LTC2378IDE-20#PBF require an external clock source?
No, the LTC2378IDE-20#PBF includes an internal oscillator that sets the conversion time (675 ns max), eliminating the need for an external clock source or PLL. This simplifies system timing architecture and reduces jitter-sensitive components. The SCK input remains active for serial data transfer but does not control conversion timing - enabling flexible host interface clocking (up to 100 MHz) independent of sampling rate, which is determined solely by the CNV pulse rate.
What is the significance of "no missing codes" in the LTC2378IDE-20#PBF specifications?
"No missing codes" means the LTC2378IDE-20#PBF guarantees monotonic behavior across its entire 20-bit output range (–524,288 to +524,287 in 2's complement), with every possible code appearing at least once as the input sweeps from –VREF to +VREF. This is critical for closed-loop control, position feedback, and safety-critical measurements where code gaps could cause uncontrolled jumps or undetected saturation. The guarantee holds over the full –40°C to +85°C range and is verified per JEDEC JESD22-A108.
Can the LTC2378IDE-20#PBF be used in daisy-chain configurations?
Yes, the LTC2378IDE-20#PBF supports daisy-chain mode via the CHAIN pin (Pin 1). When CHAIN is high, the RDL/SDI pin functions as serial data input, accepting MSB-first data from an upstream ADC in the chain, while SDO outputs the local conversion result. This enables synchronized multi-channel sampling with a single SCK and CNV line - reducing PCB routing complexity and timing skew in systems like multi-sensor DAQ modules or phased-array receivers.
LTC2378IDE-20#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-WFDFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Number of Bits:
- 20
- Sampling Rate (Per Second):
- 1M
- 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
- Voltage - Supply, Analog:
- 2.375V ~ 2.625V
- Voltage - Supply, Digital:
- 2.375V ~ 2.625V
- Features:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 16-DFN (4x3)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC2378IDE-20#PBF FAQ
1.How can I place an order for LTC2378IDE-20#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2378IDE-20#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 LTC2378IDE-20#PBF reliable?
The price and inventory of LTC2378IDE-20#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2378IDE-20#PBF is usually 5 days.
3.What payment methods are accepted for LTC2378IDE-20#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2378IDE-20#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2378IDE-20#PBF?
LTC2378IDE-20#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2378IDE-20#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 LTC2378IDE-20#PBF?
For technical support, including LTC2378IDE-20#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2378IDE-20#PBF requirements.
6.How does Aetrix verify that LTC2378IDE-20#PBF is sourced from the original manufacturer or authorized distributors?
All LTC2378IDE-20#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 LTC2378IDE-20#PBF meets industry standards.
7.What is the process for return or replacement of LTC2378IDE-20#PBF?
All LTC2378IDE-20#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2378IDE-20#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 LTC2378IDE-20#PBF part is unused and in its original packaging.
Return procedure for LTC2378IDE-20#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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