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Analog Devices Inc. LTC1857IG#TRPBF
- Part No.:
- LTC1857IG#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 28-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
LTC1857IG#TRPBF.pdf
- Description:
- IC ADC 12BIT SAR 28SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,271
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Product details
Overview
LTC1857IG#TRPBF from Analog Devices (formerly Linear Technology) is a 12-bit, 8-channel, 100ksps software-programmable analog-to-digital converter with ±25V fault-protected inputs, single 5V supply operation, and SoftSpan™ input range selection (0V–5V, 0V–10V, ±5V, or ±10V). It integrates an internal 2.5V reference, precision sample-and-hold, and SPI/MICROWIRE™ serial interface - deployed in industrial process control, multiplexed data acquisition, and high-speed PC-based DAQ systems.
For engineers reviewing the LTC1857IG#TRPBF datasheet, LTC1857IG#TRPBF pinout, LTC1857IG#TRPBF application, or LTC1857IG#TRPBF equivalent, key selection criteria include its ±1 LSB INL over –40°C to +85°C, 40mW typical power dissipation in active mode, 28-pin SSOP package, ±25V input fault tolerance, and support for both single-ended and differential channel configurations.
Technical Context
The LTC1857IG#TRPBF implements a successive approximation register (SAR) architecture with an internal synchronized clock trimmed for ≤5 µs conversion time. Its SoftSpan™ programmable attenuator network precedes the 8-channel analog multiplexer, eliminating multiplexer on-resistance errors and enabling per-channel input range selection without external components.
It features three independent ground domains (AGND1/AGND2/AGND3), separate analog (AVDD), digital (DVDD), and output buffer (OVDD) supplies, and fault protection that isolates overvoltage events on unselected channels - ensuring conversion integrity on the selected channel even under ±25V transient conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - delivers 4096 discrete output codes with guaranteed no missing codes across full temperature range. |
| Sampling Rate | 100 ksps - supports real-time acquisition of signals up to 50 kHz (Nyquist-limited) with deterministic timing via CONVST/BUSY handshake. |
| INL Error | ±1 LSB (max, –40°C to +85°C) - ensures monotonicity and <0.024% full-scale linearity error for precision sensor interfacing. |
| Input Voltage Ranges | Software-selectable 0V–5V, 0V–10V, ±5V, or ±10V - enables flexible signal conditioning without external op-amp gain stages or level shifting. |
| Power Dissipation | 40 mW (typ, active) - reduces thermal load in dense PCB layouts; drops to 27.5 mW in Nap mode and 8 µW in Sleep mode for low-duty-cycle applications. |
| Input Fault Protection | ±25 V on CH0–CH7 and COM - allows direct connection to industrial field sensors without external clamping diodes or series resistors. |
| Reference | Internal 2.5 V ±10 ppm/°C reference with buffered 4.096 V REFCOMP output - eliminates need for external voltage reference in most applications. |
Pinout & Package
Package: 28-lead plastic SSOP (G package), 5.6 mm × 10.2 mm body, 0.65 mm lead pitch, RoHS-compliant, lead-free finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| COM (1) | Common reference for single-ended inputs | Must be low-noise and tied to analog ground plane; defines zero point for all CH0–CH7 single-ended measurements. |
| CH0–CH7 (2–9) | Analog multiplexer inputs | ±25V fault-tolerant inputs; each configurable as single-ended (vs. COM) or differential pair (e.g., CH0+/CH1–). |
| MUXOUT+ / MUXOUT– (10–11) | Multiplexer output differential pair | Drives ADC+ and ADC– internally; accessible for external signal monitoring or custom front-end filtering. |
| ADC+ / ADC– (12–13) | Differential analog inputs to SAR core | Accept rescaled signals from MUXOUT; high-impedance (Hi-Z) in hold mode (4 pF capacitance) minimizes sampling disturbance. |
| CONVST (28) | Conversion start trigger | Rising-edge sensitive; initiates acquisition and conversion sequence - minimum 40 ns pulse width required. |
| BUSY (22) | Conversion status indicator | Active-low open-drain output; asserts low during conversion (≤5 µs), enabling synchronous readout or FIFO buffering. |
| SDO / SDI / SCK / RD (23, 25, 26, 27) | SPI/MICROWIRE™ serial interface | 3-wire + RD protocol; supports 20 MHz SCK, MSB-first 16-bit frame (12 data bits + 4 control bits), and 3V/5V logic compatibility. |
| VREF / REFCOMP (15–16) | Reference voltage outputs | VREF = 2.5 V ±10 ppm/°C; REFCOMP = 4.096 V buffered output - both require dedicated bypassing (1 µF + 10 µF) for optimal SNR. |
Key Features
| Feature | Design Value |
|---|---|
| Per-channel software-programmable input span | Enables mixed-signal acquisition (e.g., 4× 0–10V thermocouple inputs + 4× ±5V strain gauge pairs) without hardware reconfiguration. |
| ±25V fault protection on all analog inputs | Eliminates need for external TVS diodes or current-limiting resistors in harsh industrial environments with ESD or surge exposure. |
| Three isolated ground planes (AGND1/AGND2/AGND3) | Reduces ground bounce and digital noise coupling into analog path - critical for achieving 74 dB SINAD at 1 kHz input. |
| Two low-power shutdown modes (Nap/Sleep) | Nap mode cuts supply current to 8 mA (27.5 mW); Sleep mode reduces it to 5.5 µA (8 µW), enabling battery-powered remote sensing. |
| Internal 2.5V reference with 4.096V buffered output | Provides stable, low-drift reference for internal DAC and external circuitry - avoids cost and board space of discrete 4.096V references. |
Applications
| Industrial Process Control | Multiplexed Data Acquisition Systems |
|---|---|
Use Scenario: Monitoring temperature, pressure, and flow sensors across 8 PLC I/O modules with varying output ranges (0–10V, ±5V). IC Role / Device Role / Timing Role: 8-channel ADC with per-channel SoftSpan™ configuration acts as central digitizer; CONVST/BUSY handshake synchronizes with PLC scan cycle. Use Value: Eliminates 8 discrete signal-conditioning circuits; ±1 LSB INL ensures calibration stability over –40°C to +85°C ambient. |
Use Scenario: High-density DAQ card acquiring vibration, current, and voltage signals from rotating machinery using shared sensor inputs. IC Role / Device Role / Timing Role: Fault-protected MUX routes signals to SAR core; ±25V tolerance prevents latch-up during motor startup transients. Use Value: Enables hot-swappable sensor connections without system shutdown; 100 ksps throughput captures 50 kHz harmonics for predictive maintenance. |
| High-Speed PC-Based Data Acquisition | Digital Signal Processing Front-End |
Use Scenario: USB DAQ dongle digitizing audio-band and control signals from lab equipment into Windows/Linux host via microcontroller bridge. IC Role / Device Role / Timing Role: SPI-interfaced ADC feeds 16-bit samples to ARM Cortex-M4; RD/SDO timing optimized for 20 MHz SCK burst reads. Use Value: 40 mW power enables fanless enclosure design; internal reference removes need for external precision reference IC. |
Use Scenario: Real-time DSP board preprocessing analog sensor data before FFT or filtering in FPGA or SHARC processor. IC Role / Device Role / Timing Role: ADC+ and ADC– drive differential inputs of anti-alias filter; BUSY signal triggers DMA transfer to processor memory. Use Value: 74 dB SINAD and –101 dB THD preserve signal fidelity for spectral analysis; 4 µs conversion time aligns with tight DSP scheduling windows. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar multichannel, programmable-input-range ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS8688IPWR | 16-bit, 8-channel, SAR ADC with integrated PGA (±10.24V max input), but requires external reference and lacks ±25V fault protection. | Higher resolution suited for metrology; less robust in industrial field wiring where overvoltage is common. | Select when absolute accuracy >16-bit and external reference is acceptable; avoid where ±25V transients occur. |
| MAX11624EEE+ | 12-bit, 8-channel, 250 ksps SAR ADC with internal reference, but only supports unipolar 0–VREF ranges and no fault protection. | Higher speed for streaming applications; limited to single-ended 0–2.5V/0–4.096V inputs - unsuitable for bipolar field sensors. | Select for cost-sensitive, unipolar-only systems requiring >100 ksps; not viable for ±5V/±10V or fault-prone environments. |
Compared with ADS8688IPWR and MAX11624EEE+, the LTC1857IG#TRPBF uniquely combines ±25V fault tolerance, software-selectable bipolar/unipolar spans, and guaranteed ±1 LSB INL over industrial temperature - making it the only option that maintains accuracy and reliability without external protection or range-scaling circuitry.
Availability
LTC1857IG#TRPBF 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 guaranteed –40°C to +85°C performance.
Supply support for LTC1857IG#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, formed through the acquisition of Linear Technology in 2017.
The LTC1857IG#TRPBF belongs to ADI's legacy Linear Technology precision data acquisition portfolio, designed specifically for industrial and instrumentation applications demanding robustness, configurability, and guaranteed DC accuracy across extended temperature ranges.
FAQ
What is the operating temperature range for the LTC1857IG#TRPBF?
The LTC1857IG#TRPBF is specified for operation from –40°C to +85°C (Industrial grade), as indicated by the "I" suffix in the part number. All key DC specifications - including ±1 LSB integral nonlinearity, ±25V fault protection, and 40 mW power dissipation - are guaranteed across this full range.
Does the LTC1857IG#TRPBF require an external reference voltage?
No, the LTC1857IG#TRPBF includes a factory-trimmed 2.5 V internal reference with ±10 ppm/°C drift and a buffered 4.096 V REFCOMP output. An external reference may be applied to VREF only if higher absolute accuracy is required - the internal reference is sufficient for most industrial DAQ applications.
How does the SoftSpan™ feature work on the LTC1857IG#TRPBF?
The SoftSpan™ feature on the LTC1857IG#TRPBF uses on-chip resistor networks and switches to program each channel's input range (0V–5V, 0V–10V, ±5V, or ±10V) via an 8-bit command sent to SDI before conversion. This occurs before the multiplexer, eliminating on-resistance errors and enabling per-channel range flexibility without external components.
Can the LTC1857IG#TRPBF accept differential inputs?
Yes, the LTC1857IG#TRPBF supports both single-ended (vs. COM) and differential input configurations. The 8-channel multiplexer can be programmed to route any two adjacent channels (e.g., CH0/CH1) as a differential pair to MUXOUT+/MUXOUT–, which feed the ADC+ and ADC– inputs directly.
What are the power-saving modes available on the LTC1857IG#TRPBF?
The LTC1857IG#TRPBF offers two user-selectable low-power modes: Nap mode (8 mA supply current, 27.5 mW) and Sleep mode (5.5 µA, 8 µW). Both are controlled via the same 8-bit SDI command used for channel/range selection, allowing dynamic power scaling based on acquisition duty cycle.
LTC1857IG#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- SoftSpan™
- Package/Case:
- 28-SSOP (0.209", 5.30mm Width)
- Packaging:
- Tape & Reel (TR)
- 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:
- -40°C ~ 85°C
- Supplier Device Package:
- 28-SSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC1857IG#TRPBF FAQ
1.How can I place an order for LTC1857IG#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1857IG#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 LTC1857IG#TRPBF reliable?
The price and inventory of LTC1857IG#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1857IG#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1857IG#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1857IG#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1857IG#TRPBF?
LTC1857IG#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1857IG#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 LTC1857IG#TRPBF?
For technical support, including LTC1857IG#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1857IG#TRPBF requirements.
6.How does Aetrix verify that LTC1857IG#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1857IG#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 LTC1857IG#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1857IG#TRPBF?
All LTC1857IG#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1857IG#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 LTC1857IG#TRPBF part is unused and in its original packaging.
Return procedure for LTC1857IG#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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