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Analog Devices Inc. LTC1856CG#TRPBF
- Part No.:
- LTC1856CG#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 28-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
LTC1856CG#TRPBF.pdf
- Description:
- IC ADC 16BIT SAR 28SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,488
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Product details
Overview
LTC1856CG#TRPBF from Analog Devices (formerly Linear Technology) is a 16-bit, 8-channel, 100ksps successive-approximation analog-to-digital converter with ±10V bipolar input range, ±30V fault protection on all inputs, and SPI/MICROWIRE™-compatible serial interface. It integrates an internal 2.5V reference, 4.096V buffered reference output (REFCOMP), and programmable single-ended/differential input configuration - used in industrial process control, multiplexed data acquisition, and high-speed PC-based measurement systems.
For engineers reviewing the LTC1856CG#TRPBF datasheet, LTC1856CG#TRPBF pinout, LTC1856CG#TRPBF application, or LTC1856CG#TRPBF equivalent, key selection criteria include guaranteed 100ksps sampling rate, ±3LSB integral nonlinearity, 87dB SINAD at 1kHz, 28-pin SSOP package with exposed ground pad, and dual-mode power shutdown (27.5mW Nap / 40µW Sleep).
Technical Context
The LTC1856CG#TRPBF implements a capacitor-based SAR architecture with internal sample-and-hold, factory-trimmed 5µs max conversion time, and synchronized internal clock - eliminating external timing components. Its 8-channel analog multiplexer precedes the ADC core and includes precision resistor networks for ±10V scaling and channel-specific overvoltage protection up to ±30V without affecting selected channel accuracy.
Digital interface uses a 3-wire SPI-compatible protocol (SCK/SDI/SDO) with active-low RD control and BUSY status flag. The device supports 3V- or 5V-tolerant digital I/O via dedicated OVDD supply, and features two independent ground domains (AGND1/2/3 and DGND) with separate AVDD/DVDD/OVDD supplies for noise isolation in mixed-signal systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16-bit - delivers 65,536 discrete output codes with two's complement format for full ±10V range (305.2µV/LSB) |
| Sampling Rate | 100ksps - guaranteed minimum throughput with ≤5µs conversion time and ≤4µs acquisition time |
| INL | ±3LSB - ensures monotonicity and end-point linearity across full temperature range (0°C to 70°C) |
| SINAD | 87dB at 1kHz - enables >14-bit effective resolution for low-distortion signal capture |
| Input Range | ±10V bipolar - supported by internal resistor network and ±30V fault tolerance on all 8 MUX inputs and COM |
| Power Dissipation | 40mW at 100ksps - drops to 27.5mW (Nap) or 40µW (Sleep) for battery-sensitive or thermally constrained designs |
| Reference | Internal 2.50V ±10ppm/°C bandgap - provides stable full-scale calibration without external components |
Pinout & Package
Package: 28-lead plastic SSOP (G package) with exposed thermal pad soldered to PCB ground plane (θJA = 160°C/W, TJMAX = 125°C).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| COM (1) | Common reference for single-ended inputs | Noise-sensitive analog ground reference point; must connect to clean AGND plane |
| CH0–CH7 (2–9) | Analog multiplexer inputs | ±30V fault-protected channels; software-programmable as SE or differential pairs |
| MUXOUT+ / MUXOUT– (10–11) | Multiplexer differential output | Drives ADC+ and ADC–; isolates front-end attenuation from ADC core |
| ADC+ / ADC– (12–13) | Differential analog input to SAR core | Accepts rescaled ±10V signals; 12pF hold-mode capacitance requires low-Z drive |
| VREF (15) | 2.5V internal reference output | Bypass with 1µF tantalum to AGND; usable as external reference source |
| REFCOMP (16) | 4.096V buffered reference output | Drives internal DAC; bypass with 10µF + 0.1µF to AGND; DC load ≤2mA only |
| CONVST (28) | Conversion start trigger | Rising-edge initiated; ≥40ns pulse width required; starts acquisition and conversion sequence |
| RD (27) | Serial data read enable | Active-low control of SDO output; determines data-read timing mode (Mode 1 or Mode 2) |
| OVDD (21) | Digital output supply | Configures SDO/BUSY logic levels for 3V or 5V host systems independently of DVDD |
Key Features
| Feature | Design Value |
|---|---|
| ±30V input fault protection | Prevents latch-up and preserves conversion integrity on unselected channels during overvoltage events |
| Software-programmable input configuration | Per-channel selection of single-ended or differential mode via 8-bit SDI command word |
| Onboard 2.5V ±10ppm/°C reference | Eliminates need for external precision reference; enables self-contained operation with <1% full-scale error |
| Three-state digital outputs with OVDD control | Enables direct interfacing to 3V or 5V microcontrollers/FPGAs without level-shifting circuitry |
| Channel-to-channel isolation >120dB | Ensures crosstalk-free simultaneous sampling in multi-sensor monitoring applications |
Applications
| Industrial Process Control | Multiplexed Data Acquisition |
|---|---|
Use Scenario: Monitoring temperature, pressure, and flow sensors across 8 PLC I/O modules with ±10V industrial transmitters. IC Role / Device Role / Timing Role: 16-bit ADC core with integrated MUX and fault protection serves as central digitizer for analog sensor array. Use Value: ±3LSB INL and 87dB SINAD ensure accurate representation of slow-varying process variables without post-calibration. | Use Scenario: High-density test equipment capturing synchronized voltage/current waveforms from multiple DUTs. IC Role / Device Role / Timing Role: 100ksps sampling engine with programmable SE/diff inputs acquires multi-channel analog data for real-time analysis. Use Value: 4µs acquisition time and 5µs conversion guarantee deterministic timing for triggered capture sequences. |
| PC-Based High-Speed DAQ | DSP-Front-End Signal Conditioning |
Use Scenario: USB-connected oscilloscope module digitizing audio-band signals from microphone preamps and sensor interfaces. IC Role / Device Role / Timing Role: SPI-connected ADC providing 16-bit samples to host processor via FIFO or DMA path. Use Value: BUSY flag and RD-controlled SDO enable reliable handshaking with low-latency host firmware. | Use Scenario: Real-time vibration analysis system feeding conditioned analog signals into TI C6000 or Analog Devices SHARC DSP. IC Role / Device Role / Timing Role: Precision front-end digitizer with internal reference and low aperture jitter (60ps) for FFT-based spectral analysis. Use Value: 87dB SINAD and –101dB THD preserve signal fidelity critical for detecting sub-harmonic mechanical faults. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 16-bit, multichannel, ±10V-input ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS8688IPWR | 16-bit, 8-channel, ±10.24V range, SPI interface, 500ksps, internal 4.096V ref, no ±30V fault protection | Higher speed but lacks robust overvoltage tolerance; requires external protection diodes in harsh environments | Select when higher throughput is prioritized over field-reliability under transient overvoltage |
| AD7606BSTZ | 16-bit, 8-channel, ±10V range, parallel/SPI, 200ksps, on-chip 2.5V ref, ±16.5V overvoltage rating | Parallel interface increases pin count and layout complexity; lower INL (±0.5LSB) but higher power (110mW) | Select when system demands lowest INL and parallel bus integration outweighs power and footprint constraints |
Compared with ADS8688IPWR and AD7606BSTZ, the LTC1856CG#TRPBF offers superior fault resilience (±30V), lowest active power (40mW), and smallest footprint (28-SSOP), making it optimal for space-constrained, field-deployed instrumentation where reliability trumps raw speed.
Availability
LTC1856CG#TRPBF is available at Aetrix Electronics and suitable for industrial process control, multiplexed data acquisition systems, and PC-based high-speed DAQ requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LTC1856CG#TRPBF 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 semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LTC1856CG#TRPBF belongs to ADI's legacy Linear Technology precision data acquisition product line, engineered for high-accuracy, multichannel, ±10V industrial sensing applications with integrated protection and minimal external component count.
FAQ
What is the operating temperature range for the LTC1856CG#TRPBF?
The LTC1856CG#TRPBF is specified for the commercial temperature range of 0°C to 70°C. This is indicated by the "C" suffix in the part number. The "I" grade variant (LTC1856IG#TRPBF) extends operation to –40°C to 85°C. All DC and dynamic specifications - including ±3LSB INL, 87dB SINAD, and 100ksps sampling - are guaranteed across this full 0°C to 70°C range.
Does the LTC1856CG#TRPBF require an external reference?
No, the LTC1856CG#TRPBF does not require an external reference. It integrates a factory-trimmed 2.50V ±10ppm/°C bandgap reference (VREF) and a 4.096V buffered output (REFCOMP) for internal DAC biasing. External references may be applied to VREF for improved accuracy, but the LTC1856CG#TRPBF operates fully functional with its internal reference alone.
How is the input configuration (single-ended vs. differential) controlled on the LTC1856CG#TRPBF?
The LTC1856CG#TRPBF uses an 8-bit configuration word shifted into SDI during each conversion cycle to select input mode per channel or channel pair. Bits define SGL/DIFF, ODD/SIGN, MUX address, and power-down state. This software-programmable flexibility allows mixed SE/diff configurations across the 8 channels without hardware changes - a feature confirmed in the Functional Block Diagram and Applications Information section.
What is the purpose of the OVDD pin on the LTC1856CG#TRPBF?
The OVDD pin on the LTC1856CG#TRPBF sets the logic-high voltage level for the SDO and BUSY digital outputs, enabling direct interfacing with either 3V or 5V host systems. Unlike DVDD (digital core supply), OVDD decouples output swing from internal logic voltage - allowing the LTC1856CG#TRPBF to drive 3V FPGAs or microcontrollers while operating from a 5V DVDD/AVDD supply, eliminating level-shifters.
Can the LTC1856CG#TRPBF withstand overvoltage on unused channels without affecting conversion accuracy?
Yes. The LTC1856CG#TRPBF provides ±30V fault protection on all CH0–CH7 and COM inputs. A fault condition on any unselected channel will not corrupt the conversion result of the selected channel - a key design feature verified in the Typical Application schematic and Absolute Maximum Ratings table. This behavior results from the resistor-network-based front-end preceding the multiplexer.
LTC1856CG#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 28-SSOP (0.209", 5.30mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Number of Bits:
- 16
- 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:
- -
LTC1856CG#TRPBF FAQ
1.How can I place an order for LTC1856CG#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1856CG#TRPBF 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 LTC1856CG#TRPBF reliable?
The price and inventory of LTC1856CG#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1856CG#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1856CG#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1856CG#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1856CG#TRPBF?
LTC1856CG#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1856CG#TRPBF 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 LTC1856CG#TRPBF?
For technical support, including LTC1856CG#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1856CG#TRPBF requirements.
6.How does Aetrix verify that LTC1856CG#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1856CG#TRPBF 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 LTC1856CG#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1856CG#TRPBF?
All LTC1856CG#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1856CG#TRPBF, 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 LTC1856CG#TRPBF part is unused and in its original packaging.
Return procedure for LTC1856CG#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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