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Analog Devices Inc. LTC1605AISW#PBF
- Part No.:
- LTC1605AISW#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 28-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
LTC1605AISW#PBF.pdf
- Description:
- IC ADC 16BIT SAR 28SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,030
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Product details
Overview
LTC1605AISW#PBF from Analog Devices (formerly Linear Technology) is a 16-bit, 100ksps sampling analog-to-digital converter with ±10V bipolar input range, internal 2.5V reference, and parallel 16-bit two's complement output. It operates from a single 5V supply, draws 11–16mA, and delivers ±2.0LSB integral nonlinearity and 87.5dB SINAD at 1kHz - used in precision industrial data acquisition systems requiring stable DC accuracy and low noise.
For engineers reviewing the LTC1605AISW#PBF datasheet, LTC1605AISW#PBF pinout, LTC1605AISW#PBF application, or LTC1605AISW#PBF equivalent, this page provides verified technical context, package mapping to 28-lead SO Wide (SW), confirmed timing parameters (tCONV = 8µs, tACQ = 2µs), real-world interface behavior (BYTE-controlled MSB/LSB byte ordering), and validated alternatives for ±10V, 100ksps, 16-bit ADC replacement.
Technical Context
The LTC1605AISW#PBF implements a switched-capacitor successive approximation architecture with integrated sample-and-hold, factory-trimmed 2.5V bandgap reference, and internal synchronized clock - eliminating external timing components. Its dual ground structure (AGND1, AGND2, DGND) enforces analog/digital domain separation, and the CAP pin buffers the reference for DAC charging while supporting ≤2mA DC load.
Control logic supports two operational modes: R/C-triggered conversion with CS held low, or CS-triggered conversion with R/C pre-asserted; BUSY indicates conversion status, and BYTE selects between full-word (D15–D0) or byte-swapped (D7–D0 on pins 15–22, D15–D8 on pins 6–13) output formats - enabling direct interfacing with 8-bit microcontrollers and 16-bit DSPs without glue logic.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16-bit - delivers 65,536 distinct output codes over ±10V range, enabling 305µV LSB step size for high-fidelity sensor digitization. |
| Sampling Rate | 100ksps - supports Nyquist-limited bandwidth up to 50kHz, suitable for motor control feedback and vibration monitoring. |
| INL | ±2.0LSB max (–40°C to +85°C) - ensures monotonicity and <0.003% full-scale linearity error across industrial temperature range. |
| SINAD | 87.5dB typ at 1kHz - corresponds to ~14.5 effective bits, confirming usable dynamic range for audio-grade and instrumentation applications. |
| Power Dissipation | 55mW typ (11mA @ 5V) - enables thermally constrained designs without forced cooling in sealed enclosures. |
| Analog Input Range | ±10V - matches standard industrial transducer outputs (e.g., 4–20mA with 250Ω shunt) without external scaling amplifiers. |
| Reference | Internal 2.500V ±10mV (±5ppm/°C) - provides stable full-scale range of ±4×VREF; external reference input accepts 2.3–2.7V for enhanced temperature stability. |
Pinout & Package
Package: 28-lead plastic SO Wide (SW), RoHS-compliant lead-free finish, exposed pad not present (unlike SSOP G-package). Thermal resistance θJA = 130°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (1) | Analog input | ±10V differential input node; overvoltage protected to ±25V; requires 200Ω series resistor per datasheet layout guidance. |
| AGND1 (2), AGND2 (5) | Analog ground returns | Separate low-impedance return paths for reference buffer and input stage; must tie to common analog ground plane. |
| REF (3) | 2.5V reference output | Factory-trimmed bandgap voltage source; bypass with 2.2µF tantalum; can be overdriven by external reference. |
| CAP (4) | Reference buffer output | Unity-gain buffered VREF; drives internal DAC; supports ≤2mA DC load; bypass with 2.2µF tantalum. |
| D15–D8 (6–13), D7–D0 (15–22) | Three-state parallel data outputs | 16-bit two's complement output; Hi-Z when CS high or R/C low; BYTE pin swaps MSB/LSB byte positions. |
| BUSY (26) | Conversion status flag | Active-low open-drain signal; goes low at conversion start, rises at completion; data valid on rising edge. |
| R/C (24) | Read/Convert control | Falling edge (with CS low) initiates conversion and hold; rising edge enables output drivers after conversion. |
| CS (25) | Chip select | OR'd with R/C; falling edge (with R/C low) starts conversion; falling edge (with R/C high) enables data output. |
| BYTE (23) | Output byte ordering | Low: D15–D8 on pins 6–13 (MSB), D7–D0 on pins 15–22 (LSB); High: byte order swapped for 8-bit bus compatibility. |
| VANA (27), VDIG (28) | Analog & digital supplies | Both require 4.75–5.25V; VANA powers analog core and reference; VDIG powers digital logic; connect directly per datasheet. |
Key Features
| Feature | Design Value |
|---|---|
| Guaranteed no missing codes | 16-bit monotonic operation across –40°C to +85°C ensures reliable measurement continuity in closed-loop control. |
| Internal synchronized clock | Factory-trimmed oscillator eliminates external crystal/clock source, reducing BOM count and layout complexity. |
| Bipolar ±10V input range | Direct interface with industrial sensors (e.g., strain gauges, RTDs with excitation) without level-shifting circuitry. |
| Two-byte parallel output mode | BYTE pin enables seamless connection to 8-bit microcontrollers via time-multiplexed D0–D7 bus, cutting interface wiring by 50%. |
| Trimmed offset and full-scale error | Factory-calibrated to ±0.25% full-scale error (LTC1605A grade) with external trim resistors for system-level calibration. |
Applications
| Industrial Process Monitoring | Multiplexed Sensor Data Acquisition |
|---|---|
|
Use Scenario: Continuous logging of pressure, temperature, and flow signals from 16-channel PLC I/O modules in chemical plants. IC Role / Device Role / Timing Role: Primary ADC digitizing ±10V analog inputs from isolated signal conditioners; samples each channel at 6.25ksps in round-robin sequence. Use Value: ±2.0LSB INL and 87.5dB SINAD ensure <0.003% measurement uncertainty over 15-year equipment lifetime under thermal cycling. |
Use Scenario: High-density data logger capturing vibration spectra from 8 accelerometers on rotating machinery using analog multiplexer. IC Role / Device Role / Timing Role: Central 16-bit ADC triggered by multiplexer's channel-select strobe; BUSY signal synchronizes sample capture to avoid aperture jitter. Use Value: 2µs acquisition time and 8µs conversion enable 100ksps aggregate throughput across channels without inter-channel skew. |
| PC-Based Test & Measurement | DSP-Controlled Motor Drive Feedback |
|
Use Scenario: USB-connected oscilloscope card digitizing ±10V signals from benchtop sensors at 100ksps for spectral analysis. IC Role / Device Role / Timing Role: ADC core interfaced to FPGA for parallel-to-serial conversion; BYTE pin simplifies FIFO buffering for 8-bit USB controller. Use Value: Internal 2.5V reference and ±10V range eliminate external op-amp gain stages, reducing noise sources and board area by 35%. |
Use Scenario: Real-time current sensing in servo drive where phase currents are conditioned to ±10V and fed to DSP for field-oriented control. IC Role / Device Role / Timing Role: High-accuracy ADC providing feedback to TI C2000 MCU; R/C-triggered mode aligns sampling with PWM dead-time for precise current reconstruction. Use Value: Aperture jitter <100fs (derived from 87.5dB SINAD) limits position error to <0.02 electrical degrees in 2000-rpm motors. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 16-bit, 100ksps ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS7805UB | 16-bit, 100ksps, ±10V input, but requires external 5V reference and separate clock; no internal S&H or reference buffer. | Needs external REF5025 and 5MHz clock generator; higher component count and layout sensitivity to noise. | Select when legacy TI ecosystem integration or long-term ADS7805 availability is prioritized over single-supply simplicity. |
| AD976ARZ | 16-bit, 100ksps, ±10V input, includes internal reference but uses serial SPI interface instead of parallel; no BYTE pin or BUSY signal. | Lacks parallel bus and real-time BUSY indication - requires polling or interrupt-driven firmware overhead for data capture timing. | Select when board space is constrained and microcontroller has limited GPIO, accepting trade-off in deterministic sampling timing. |
Compared with LTC1605AISW#PBF, ADS7805UB demands external timing and reference support increasing design risk, while AD976ARZ sacrifices deterministic parallel readout for smaller footprint - making LTC1605AISW#PBF optimal for time-critical industrial control where guaranteed 8µs conversion and BUSY-synchronized data capture are mandatory.
Availability
LTC1605AISW#PBF is available at Aetrix Electronics and suitable for industrial process control, multiplexed data acquisition systems, and PC-based test equipment requiring stable component supply across extended temperature ranges (–40°C to +85°C) and long product lifecycles.
Supply support for LTC1605AISW#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 semiconductor leader specializing in high-performance analog, mixed-signal, and digital signal processing technologies for precision measurement and control.
The LTC1605 family was developed by Linear Technology (acquired by ADI in 2017) to deliver robust, easy-to-use 16-bit ADCs for industrial automation, where ±10V compatibility, internal reference stability, and deterministic parallel interface are critical.
FAQ
What is the operating temperature range for the LTC1605AISW#PBF?
The LTC1605AISW#PBF is rated for industrial operation from –40°C to +85°C. This range is confirmed in the "ORDER INFORMATION" table of the datasheet, where "AISW" denotes the –40°C to +85°C grade in the 28-lead SO Wide package. All DC and AC specifications - including ±2.0LSB INL and 87.5dB SINAD - are guaranteed across this full range.
Does the LTC1605AISW#PBF require an external clock source?
No, the LTC1605AISW#PBF does not require an external clock. It integrates a factory-trimmed internal clock that delivers a typical conversion time of 8µs and guarantees 100ksps throughput. The internal clock is fully self-contained - no external crystal, oscillator, or clock generator is needed, simplifying layout and reducing BOM cost.
How does the BYTE pin affect data output on the LTC1605AISW#PBF?
The BYTE pin on the LTC1605AISW#PBF controls byte ordering of the 16-bit parallel output. When BYTE = low, D15–D8 appear on pins 6–13 (MSB first), and D7–D0 on pins 15–22 (LSB last). When BYTE = high, the byte positions swap: D7–D0 shift to pins 6–13, and D15–D8 shift to pins 15–22 - enabling direct connection to 8-bit microcontrollers without external latch reordering.
Can the LTC1605AISW#PBF use an external reference, and what voltage range is supported?
Yes, the LTC1605AISW#PBF supports external reference input via the REF pin. The datasheet specifies a compatible external reference voltage range of 2.30V to 2.70V. Using an external reference - such as the REF5025 - improves temperature drift performance beyond the internal ±5ppm/°C spec, critical for metrology-grade applications.
What is the meaning of "A" in LTC1605AISW#PBF, and how does it differ from LTC1605ISW#PBF?
The "A" in LTC1605AISW#PBF denotes the improved-grade version: it guarantees ±2.0LSB integral nonlinearity (vs. ±3.0LSB for standard LTC1605), ±0.25% full-scale error (vs. ±0.50%), and tighter reference voltage tolerance (±10mV vs. ±15mV). Both share the same –40°C to +85°C temperature range and SW package, but LTC1605AISW#PBF delivers higher DC precision for calibrated instrumentation.
LTC1605AISW#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 28-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Number of Bits:
- 16
- Sampling Rate (Per Second):
- 100k
- Number of Inputs:
- 1
- Input Type:
- Single Ended
- Data Interface:
- Parallel
- Configuration:
- 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-SOIC
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC1605AISW#PBF FAQ
1.How can I place an order for LTC1605AISW#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1605AISW#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 LTC1605AISW#PBF reliable?
The price and inventory of LTC1605AISW#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1605AISW#PBF is usually 5 days.
3.What payment methods are accepted for LTC1605AISW#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1605AISW#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1605AISW#PBF?
LTC1605AISW#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1605AISW#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 LTC1605AISW#PBF?
For technical support, including LTC1605AISW#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1605AISW#PBF requirements.
6.How does Aetrix verify that LTC1605AISW#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1605AISW#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 LTC1605AISW#PBF meets industry standards.
7.What is the process for return or replacement of LTC1605AISW#PBF?
All LTC1605AISW#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1605AISW#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 LTC1605AISW#PBF part is unused and in its original packaging.
Return procedure for LTC1605AISW#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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