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Analog Devices Inc. LTC1857CG#PBF
- Part No.:
- LTC1857CG#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 28-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
LTC1857CG#PBF.pdf
- Description:
- IC ADC 12BIT SAR 28SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:257
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Product details
Overview
LTC1857CG#PBF from Analog Devices (formerly Linear Technology) is a 12-bit, 8-channel, 100ksps software-programmable analog-to-digital converter with SoftSpan™ input range selection (0V–5V, 0V–10V, ±5V, or ±10V), ±25V fault-protected multiplexer inputs, and SPI/MICROWIRE™ serial interface. It operates from a single 5V supply and delivers ±1LSB integral nonlinearity, 40mW typical power dissipation, and on-chip 2.5V reference - enabling high-accuracy data acquisition in industrial process control and multiplexed sensor systems.
For engineers reviewing the LTC1857CG#PBF datasheet, LTC1857CG#PBF pinout, LTC1857CG#PBF application, or LTC1857CG#PBF equivalent, this page provides verified technical context, confirmed pin functions, real-world use scenarios for multichannel industrial sensing, and validated alternative parts with documented functional and application differences.
Technical Context
The LTC1857CG#PBF implements a successive approximation register (SAR) architecture with an integrated sample-and-hold, internal 2.5V bandgap reference, and programmable resistor-divider network preceding the 8-channel analog multiplexer - eliminating multiplexer on-resistance errors. Its SoftSpan™ configuration allows per-channel software selection of unipolar or bipolar input ranges without external gain/level-shifting circuitry.
Conversion is initiated by a rising edge on CONVST, with BUSY signaling active conversion; serial data is clocked out via SDO synchronized to SCK, supporting SPI/MICROWIRE™ timing. The device supports two shutdown modes (Nap and Sleep), achieves 74dB SNR at 1kHz, and guarantees 100ksps throughput with ≤5µs max conversion time using its trimmed internal clock.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - delivers 4096 discrete output codes for precise quantization of analog sensor or process signals. |
| Sampling Rate | 100ksps - supports real-time monitoring of fast-changing industrial variables (e.g., motor current, pressure transients). |
| INL | ±1 LSB (max over temp) - ensures monotonicity and <0.025% full-scale linearity error for calibration-critical measurement systems. |
| Input Range Flexibility | Software-selectable 0V–5V / 0V–10V / ±5V / ±10V - eliminates need for external signal conditioning per channel in mixed-signal applications. |
| Channel Protection | ±25V fault tolerance on CH0–CH7 and COM - prevents damage or corruption during sensor cable faults or ESD events. |
| Power Dissipation | 40mW typical (Nap mode), 27.5mW (Sleep mode) - enables thermally constrained designs in dense industrial I/O modules. |
| Digital Interface | SPI/MICROWIRE™ compatible - simplifies integration with ARM Cortex-M, TI C2000, or legacy 8051 microcontrollers without level shifters. |
Pinout & Package
Package: 28-pin plastic SSOP (G package), 0°C to 70°C operating temperature range, lead-free (Pb-free) finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| COM (1) | Common reference for single-ended inputs | Must be low-noise analog ground connection; defines zero point for all CH0–CH7 single-ended measurements. |
| CH0–CH7 (2–9) | Analog multiplexer inputs | ±25V fault-protected inputs; each configurable as single-ended or differential pair via software address word. |
| MUXOUT+ / MUXOUT– (10–11) | Multiplexer output differential pair | Drives ADC+ and ADC–; internal rescaling occurs here before sampling - isolates range-setting errors from conversion core. |
| ADC+ / ADC– (12–13) | Differential analog inputs to SAR core | Accepts scaled MUX outputs; high-impedance (Hi-Z) node requiring minimal drive strength from preceding stage. |
| VREF (15) | 2.5V internal reference output | Factory-trimmed ±10ppm/°C bandgap source; bypass with 1µF tantalum for stable reference in precision DC measurements. |
| REFCOMP (16) | 4.096V buffered reference output | 1.6384× gain buffer of VREF; supplies DAC reference; supports ≤2mA DC load but not AC loads to avoid performance degradation. |
| CONVST (28) | Active-high conversion start trigger | Rising-edge initiates acquisition and conversion; minimum 40ns pulse width required for reliable sampling. |
| BUSY (22) | Active-low conversion status indicator | Signals ongoing conversion; used for handshaking with FIFOs, DSPs, or microcontroller polling loops. |
| SDO / SDI / SCK / RD (23, 25, 26, 27) | SPI/MICROWIRE™ serial interface | 3-wire + RD protocol; supports 20MHz SCK, MSB-first natural binary output, and read-enable controlled data validity. |
Key Features
| Feature | Design Value |
|---|---|
| SoftSpan™ Input Range Programming | Per-channel software selection of 0V–5V, 0V–10V, ±5V, or ±10V eliminates external op-amp gain stages and reduces BOM count in multi-sensor systems. |
| ±25V Fault-Protected Multiplexer | Withstands transient overvoltages on unused channels without affecting selected channel accuracy - critical for field-deployed PLC analog inputs. |
| On-Chip 2.5V Reference with 4.096V Buffer | Eliminates need for external precision reference ICs; REFCOMP's 4.096V output matches common 12-bit full-scale requirements (e.g., 0–4.096V = 0–4095). |
| Two Power Shutdown Modes | Nap mode (8mA) and Sleep mode (5.5µA) enable dynamic power scaling in battery-backed or energy-conscious data loggers. |
| Internal Trimmed Clock | Guarantees ≤5µs conversion time and 100ksps throughput without external crystal or oscillator - reduces layout complexity and cost. |
Applications
| Industrial Process Control | Multiplexed Data Acquisition Systems |
|---|---|
|
Use Scenario: Monitoring temperature, pressure, flow, and valve position across 8 analog sensors in a distributed control system cabinet. IC Role / Device Role / Timing Role: 8-channel ADC digitizes conditioned 4–20mA or 0–10V sensor outputs; SoftSpan™ handles mixed-range inputs without hardware reconfiguration. Use Value: Reduces channel count per board while maintaining ±1LSB INL - enabling higher channel density and lower per-channel calibration overhead. |
Use Scenario: High-speed logging of vibration, strain gauge, and thermocouple signals in rotating machinery test benches. IC Role / Device Role / Timing Role: Simultaneous sampling of up to 8 channels at 100ksps with per-channel range optimization for varying sensor sensitivities. Use Value: ±25V input protection prevents field-induced failures during cable routing near motors or drives - improving system uptime. |
| PC-Based Data Acquisition | Digital Signal Processing Front-End |
|
Use Scenario: USB or PCIe-based DAQ card acquiring analog signals from lab instruments, environmental sensors, or educational kits. IC Role / Device Role / Timing Role: SPI interface connects directly to FPGA or microcontroller; internal reference removes need for external voltage references. Use Value: Single 5V supply operation and 40mW power simplify thermal design in compact, fanless enclosures. |
Use Scenario: Real-time preprocessing of analog sensor data prior to FFT or filtering in motor control or audio analysis systems. IC Role / Device Role / Timing Role: Provides synchronized 12-bit samples to DSP via BUSY/SDO handshake; supports deterministic latency for closed-loop timing. Use Value: 74dB SNR and –101dB THD preserve signal integrity for accurate spectral analysis of low-amplitude transients. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar multichannel ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7928BRUZ | 8-channel, 12-bit, 1MSPS SAR ADC; no internal reference; requires external 2.5V ref; 20-lead TSSOP package. | Higher speed (1MSPS) but lacks SoftSpan™ range programming and ±25V fault protection - suited for clean lab environments, not industrial field I/O. | Select AD7928BRUZ when maximum throughput >100ksps is required and external reference infrastructure already exists. |
| LTC1858CG#PBF | 14-bit resolution, ±1.5LSB INL, identical pinout/package, same SoftSpan™ and fault-protection features. | Delivers higher precision for applications requiring <0.01% full-scale accuracy (e.g., calibration standards, metrology-grade sensors). | Choose LTC1858CG#PBF when 12-bit resolution is insufficient and board layout must remain unchanged. |
Compared with AD7928BRUZ, LTC1857CG#PBF trades raw speed for integrated protection and configurability; compared with LTC1858CG#PBF, it offers lower cost and reduced digital processing overhead where 12-bit resolution meets system accuracy targets.
Availability
LTC1857CG#PBF is available at Aetrix Electronics and suitable for industrial process control, multiplexed data acquisition systems, and PC-based DAQ applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for LTC1857CG#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 LTC1857CG#PBF belongs to Linear's SoftSpan™ multichannel ADC family, designed specifically for industrial and instrumentation applications demanding flexible input ranges, robust fault tolerance, and minimal external components.
FAQ
What is the maximum sampling rate supported by the LTC1857CG#PBF?
The LTC1857CG#PBF guarantees a maximum sampling rate of 100ksps across all 8 input channels. This is achieved using its internally trimmed clock and ≤5µs conversion time. When sampling only the dedicated ADC+ and ADC– pins (bypassing the multiplexer), the device supports up to 166ksps - useful for high-speed single-channel monitoring alongside multiplexed operation.
Does the LTC1857CG#PBF require an external reference voltage?
No, the LTC1857CG#PBF includes a factory-trimmed 2.5V internal bandgap reference (VREF) and a 4.096V buffered output (REFCOMP) for the DAC. External references can be applied to VREF if higher accuracy is needed, but they are not required for standard operation. Decoupling VREF with 1µF and REFCOMP with 10µF + 0.1µF capacitors is mandatory for specified performance.
How does the SoftSpan™ feature work on the LTC1857CG#PBF?
SoftSpan™ enables software-programmable input ranges per channel via an 8-bit command written to SDI before conversion. That command selects both the MUX channel and its associated span: 0V–5V, 0V–10V, ±5V, or ±10V. The scaling occurs in the resistor-divider network *before* the multiplexer, so channel-to-channel matching remains unaffected by switch resistance variations.
What protection does the LTC1857CG#PBF offer against input overvoltage?
The LTC1857CG#PBF provides ±25V fault protection on all analog inputs (CH0–CH7 and COM). This means any channel can be exposed to voltages up to ±25V without damaging the device or corrupting conversions on other channels. Internal clamping diodes and robust input structure ensure system reliability in harsh industrial environments with long sensor cables.
Can the LTC1857CG#PBF operate with a 3V digital interface?
Yes - although the LTC1857CG#PBF runs from a 5V analog/digital supply (AVDD/DVDD/OVDD = 4.75V–5.25V), its digital I/O pins (SDI, SDO, SCK, RD, CONVST, BUSY) are 3V-compatible. VIH is specified at 2.4V min and VIL at 0.8V max, allowing direct interfacing with 3V microcontrollers or FPGAs without level-shifting circuitry.
LTC1857CG#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- SoftSpan™
- 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:
- -
LTC1857CG#PBF FAQ
1.How can I place an order for LTC1857CG#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1857CG#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 LTC1857CG#PBF reliable?
The price and inventory of LTC1857CG#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1857CG#PBF is usually 5 days.
3.What payment methods are accepted for LTC1857CG#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1857CG#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1857CG#PBF?
LTC1857CG#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1857CG#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 LTC1857CG#PBF?
For technical support, including LTC1857CG#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1857CG#PBF requirements.
6.How does Aetrix verify that LTC1857CG#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1857CG#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 LTC1857CG#PBF meets industry standards.
7.What is the process for return or replacement of LTC1857CG#PBF?
All LTC1857CG#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1857CG#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 LTC1857CG#PBF part is unused and in its original packaging.
Return procedure for LTC1857CG#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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