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Analog Devices Inc. LTC1854CG#PBF
- Part No.:
- LTC1854CG#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 28-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
LTC1854CG#PBF.pdf
- Description:
- IC ADC 12BIT SAR 28SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,679
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Product details
Overview
LTC1854CG#PBF from Analog Devices (formerly Linear Technology) is a 12-bit, 8-channel, ±10V input, 100ksps analog-to-digital converter with integrated multiplexer, ±30V fault protection, SPI/MICROWIRE-compatible serial interface, and internal 2.5V reference. It operates from a single 5V supply and supports single-ended or differential input configurations for industrial data acquisition systems.
For engineers reviewing the LTC1854CG#PBF datasheet, LTC1854CG#PBF pinout, LTC1854CG#PBF application, or LTC1854CG#PBF equivalent, key selection criteria include its ±1 LSB INL, 40mW typical power dissipation at full rate, 28-pin SSOP package, 300ns overvoltage recovery, and support for Nap/Sleep shutdown modes in precision multichannel sampling systems.
Technical Context
The LTC1854CG#PBF implements a successive-approximation register (SAR) architecture with an internal sample-and-hold circuit and factory-trimmed 4µs conversion time. Its 8-channel analog multiplexer precedes the ADC core and includes on-chip resistor networks for precise ±10V bipolar input scaling and channel-specific attenuation/offset compensation.
It features dual ground domains (AGND1/AGND2/AGND3 and DGND), separate analog (AVDD), digital (DVDD), and output buffer (OVDD) supplies, and a dedicated REFCOMP pin delivering 4.096V to drive the internal DAC - enabling stable operation without external reference components in most applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - delivers 4096 discrete output codes with monotonic transfer function and no missing codes. |
| Sampling Rate | 100ksps - guaranteed minimum throughput with 4µs conversion + 1µs acquisition time per channel. |
| INL | ±1 LSB - ensures end-point linearity error ≤ ±0.024% of full-scale range (±10V), critical for calibration-sensitive measurements. |
| Input Range | ±10V bipolar - supports direct connection to industrial sensors and transducers without external level-shifting. |
| Overvoltage Protection | ±30V on all MUX inputs - prevents damage or corruption during transient faults while preserving conversion integrity on selected channels. |
| Power Dissipation | 40mW at 100ksps - enables thermally constrained designs; reduces to 27.5mW (Nap) or 40µW (Sleep) during idle periods. |
| SPI Interface | MICROWIRE-compatible - supports standard 3-wire serial protocol with SCK up to 20MHz, RD-controlled tri-state outputs, and two's complement data format. |
Pinout & Package
Package: 28-pin plastic SSOP (G package), exposed pad soldered to PCB ground for thermal and noise performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| COM (1) | Common reference for single-ended inputs | Low-noise analog ground reference point; must be isolated from digital return paths. |
| CH0–CH7 (2–9) | Analog multiplexer inputs | ±30V fault-protected channels accepting ±10V signals; impedance ~31kΩ requires low-Z source driving. |
| MUXOUT+ / MUXOUT– (10–11) | Differential multiplexer outputs | Drive ADC+ and ADC– directly; enable differential measurement mode with common-mode rejection >96dB. |
| ADC+ / ADC– (12–13) | Core ADC analog inputs | Accept rescaled signals from MUXOUT; sample-and-hold holds voltage during conversion with <4µs acquisition time. |
| VREF (15) | 2.5V internal reference output | Bypassed with 1µF tantalum; used as precision voltage source for external circuitry or reference override. |
| REFCOMP (16) | 4.096V reference buffer output | Drives internal DAC; supports ≤2mA DC load; decoupling with 10µF + 0.1µF minimizes code transition noise. |
| CONVST (28) | Conversion start trigger | Rising-edge initiated; minimum 40ns pulse width required to enter hold mode and begin SAR conversion sequence. |
| BUSY (22) | Conversion status indicator | Active-low open-drain output signaling ongoing conversion; synchronizes host processor read timing. |
| SDO / SDI / SCK / RD (23,25,26,27) | SPI/MICROWIRE serial interface | Tri-state SDO controlled by RD; supports daisy-chaining; OVDD sets output logic levels (3V or 5V compatible). |
Key Features
| Feature | Design Value |
|---|---|
| ±30V fault-protected MUX inputs | Enables robust operation in noisy industrial environments without external clamping diodes or series resistors. |
| On-chip 2.5V bandgap reference | Eliminates need for external reference ICs; trimmed to ±10ppm/°C drift and 2.475V–2.525V tolerance over temperature. |
| Programmable input configuration | Per-channel selection of single-ended or differential mode via 8-bit configuration word, optimizing SNR and CMRR per signal source. |
| Three power states (Active/Nap/Sleep) | Reduces system power by >99% in Sleep mode (40µW), enabling battery-backed or energy-constrained remote sensing nodes. |
| Channel-to-channel isolation >120dB | Prevents crosstalk between simultaneously sampled channels, essential for high-fidelity multi-sensor monitoring. |
Applications
| Industrial Process Control | Multiplexed Data Acquisition Systems |
|---|---|
Use Scenario: Monitoring temperature, pressure, and flow sensors across 8 PLC I/O modules using shared ADC resources. IC Role / Device Role / Timing Role: 8-channel SAR ADC with ±10V input range and ±30V fault tolerance serving as central digitizer for analog sensor array. Use Value: Eliminates per-channel signal conditioning; maintains ±1 LSB INL accuracy across all channels despite shared reference and clock resources. | Use Scenario: High-speed logging of vibration, strain, and acoustic signals from rotating machinery using PC-based DAQ hardware. IC Role / Device Role / Timing Role: 100ksps sampling engine interfaced to FPGA via SPI, providing synchronized 12-bit samples from 8 analog front-end channels. Use Value: 4µs conversion time and BUSY-driven handshaking ensure deterministic timing; Nap mode reduces thermal drift during idle intervals. |
| High-Speed Data Acquisition for PCs | Digital Signal Processing Front-End |
Use Scenario: USB-connected oscilloscope module capturing transient waveforms from test equipment with minimal latency. IC Role / Device Role / Timing Role: Low-latency ADC with RD-controlled SDO enabling burst reads into FIFO memory without CPU polling overhead. Use Value: SPI interface supports 20MHz SCK for fast data streaming; 300ns overvoltage recovery prevents data loss during probe contact bounce. | Use Scenario: Real-time spectral analysis of audio or ultrasonic signals in embedded edge devices with limited power budget. IC Role / Device Role / Timing Role: Precision ADC feeding fixed-point DSP core; internal reference ensures consistent full-scale mapping across temperature. Use Value: ±1 LSB INL and 74dB SINAD at 1kHz preserve dynamic range; Sleep mode extends battery life between measurement cycles. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 12-bit multichannel ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS8556IPM | 6-channel, 16-bit, parallel interface, ±10V input, 630ksps max; requires external reference and separate analog/digital supplies. | Higher resolution and speed but larger footprint (64-pin HTQFP); suited for high-throughput systems where SPI bandwidth is limiting. | Select ADS8556IPM when >12-bit resolution and parallel readout are required; avoid if board space or SPI compatibility is constrained. |
| MAX11620ATI+ | 8-channel, 12-bit, 250ksps, SPI interface, ±10V input, internal reference; no ±30V fault protection; 24-pin TQFN package. | Lacks MUX overvoltage hardening; lower power (15mW active) but higher INL (±2.5 LSB); optimized for compact portable instrumentation. | Select MAX11620ATI+ for space-constrained, low-power applications where fault conditions are mitigated externally; avoid in unconditioned industrial field wiring. |
Compared with ADS8556IPM and MAX11620ATI+, the LTC1854CG#PBF uniquely balances ±30V fault resilience, 28-pin SSOP compactness, and guaranteed ±1 LSB INL in a single-supply 5V design - making it optimal for ruggedized, medium-speed industrial DAQ where reliability and calibration stability are prioritized over raw speed or resolution.
Availability
LTC1854CG#PBF is available at Aetrix Electronics and suitable for industrial process control, multiplexed data acquisition systems, and high-speed PC-based DAQ requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LTC1854CG#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 semiconductors.
The LTC1854CG#PBF belongs to Linear's legacy precision data acquisition product line, engineered specifically for industrial-grade multichannel sampling applications demanding fault tolerance, low power, and metrology-grade linearity without external support components.
FAQ
What is the maximum sampling rate supported by the LTC1854CG#PBF?
The LTC1854CG#PBF guarantees a maximum sampling rate of 100ksps across all 8 channels. This is achieved with a 4µs conversion time and 1µs acquisition time per channel, as specified in the timing characteristics table under fSAMPLE(MAX) = 100kHz for CH0–CH7 inputs. The internal clock is factory-trimmed to ensure this performance across the 0°C to 70°C operating temperature range without external adjustment.
Does the LTC1854CG#PBF require an external reference voltage?
No, the LTC1854CG#PBF does not require an external reference voltage. It integrates a factory-trimmed 2.5V bandgap reference (VREF, Pin 15) and a 4.096V buffered reference output (REFCOMP, Pin 16) that drives the internal DAC. External references may be applied to override VREF only if higher absolute accuracy is needed; the internal reference provides ±10ppm/°C drift and 2.475V–2.525V tolerance over temperature.
How does the ±30V fault protection work on the LTC1854CG#PBF analog inputs?
The ±30V fault protection on CH0–CH7 and COM pins uses internal clamping diodes referenced to AVDD and AGND, allowing input voltages from –30V to +30V without latch-up or damage. Crucially, a fault on any unselected channel does not affect the conversion result of the selected channel due to the MUX architecture placing attenuation and protection circuitry before the switching elements - preserving measurement integrity in harsh industrial wiring environments.
What are the power consumption modes of the LTC1854CG#PBF and how are they controlled?
The LTC1854CG#PBF offers three power states: Active (40mW at 100ksps), Nap (27.5mW), and Sleep (40µW). Mode selection is controlled via bits in the 8-bit configuration word shifted into SDI during initialization - specifically the NAP and SLEEP bits. In Nap mode, the internal clock and reference remain active but conversion logic is throttled; in Sleep mode, both clock and reference are disabled, reducing current draw to microamps while retaining register state.
Can the LTC1854CG#PBF interface directly with a 3.3V microcontroller?
Yes, the LTC1854CG#PBF can interface directly with a 3.3V microcontroller. Its digital inputs (CONVST, RD, SDI, SCK) accept 3V logic levels (VIH ≥ 2.4V, VIL ≤ 0.8V), and its digital outputs (SDO, BUSY) are driven by OVDD - which can be set to 3.3V to match the host MCU's I/O voltage. This eliminates level-shifting components while maintaining signal integrity and timing compliance per the datasheet's t6/t8/t12 specifications.
LTC1854CG#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 28-SSOP (0.209", 5.30mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Number of Bits:
- 12
- Sampling Rate (Per Second):
- 100k
- Number of Inputs:
- 8
- Input Type:
- Differential, Single Ended
- Data Interface:
- SPI
- Configuration:
- MUX-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:
- 28-SSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC1854CG#PBF FAQ
1.How can I place an order for LTC1854CG#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1854CG#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 LTC1854CG#PBF reliable?
The price and inventory of LTC1854CG#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1854CG#PBF is usually 5 days.
3.What payment methods are accepted for LTC1854CG#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1854CG#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1854CG#PBF?
LTC1854CG#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1854CG#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 LTC1854CG#PBF?
For technical support, including LTC1854CG#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1854CG#PBF requirements.
6.How does Aetrix verify that LTC1854CG#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1854CG#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 LTC1854CG#PBF meets industry standards.
7.What is the process for return or replacement of LTC1854CG#PBF?
All LTC1854CG#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1854CG#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 LTC1854CG#PBF part is unused and in its original packaging.
Return procedure for LTC1854CG#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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