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Analog Devices Inc. LTC1605CN#PBF
- Part No.:
- LTC1605CN#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 28-DIP (0.300", 7.62mm)
- Datasheet:
-
LTC1605CN#PBF.pdf
- Description:
- IC ADC 16BIT SAR 28DIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,591
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Product details
Overview
LTC1605CN#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 55mW typical power, and guarantees no missing codes across 0°C to 70°C. It is used in industrial data acquisition systems requiring high DC accuracy and stable timing.
For engineers reviewing the LTC1605CN#PBF datasheet, LTC1605CN#PBF pinout, LTC1605CN#PBF application, or LTC1605CN#PBF equivalent, this page delivers verified specifications, validated pin functions, confirmed industrial use cases, and two technically documented alternative ADCs for 16-bit, 100ksps bipolar sampling applications.
Technical Context
The LTC1605CN#PBF implements a switched-capacitor successive approximation architecture with integrated sample-and-hold, precision bandgap reference, and trimmed internal clock - eliminating external timing components. Its analog front-end supports ±25V overvoltage protection and features 20kΩ input impedance with 10pF capacitance.
Digital interface uses microprocessor-compatible parallel bus with CS/R/C control logic, BUSY status flag, and BYTE-selectable MSB-first or LSB-first 8-bit byte readout. Conversion timing is deterministic: 8µs max conversion time, 2µs acquisition time, and guaranteed 100ksps throughput under full temperature range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16-bit - delivers 65,536 discrete output levels for high-precision measurement |
| Sampling Rate | 100ksps - enables real-time capture of signals up to 50kHz Nyquist bandwidth |
| Analog Input Range | ±10V - matches standard industrial sensor outputs without external scaling |
| INL (Max) | ±2.0LSB - ensures monotonicity and <0.003% full-scale linearity error |
| Power Dissipation | 55mW typical at 5V - allows thermal management in dense PCB layouts without forced cooling |
| SINAD (Typ) | 87.5dB at 1kHz - supports >14.5 effective number of bits (ENOB) in low-frequency applications |
| Reference | Internal 2.5V ±5ppm/°C - provides stable full-scale range of ±4×VREF = ±10V without external reference |
Pinout & Package
Package: 28-Lead PDIP (Plastic Dual In-line Package), through-hole mounting, 0°C to 70°C operating range.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pin 1) | Analog input node | Accepts ±10V differential input referenced to AGND1/AGND2; protected to ±25V |
| AGND1 / AGND2 (Pins 2, 5) | Analog ground connections | Separate low-noise return paths for analog circuitry; must be tied together at single point |
| REF (Pin 3) | 2.5V reference output | Factory-trimmed bandgap voltage source; bypass with 2.2µF tantalum for stability |
| CAP (Pin 4) | Reference buffer output | Drives internal DAC; capable of <2mA DC load; decoupling critical for noise performance |
| D15–D0 (Pins 6–13, 15–22) | Three-state parallel data outputs | 16-bit two's complement code; Hi-Z when CS high or R/C low; byte-swappable via BYTE pin |
| BYTE (Pin 23) | Data bus configuration control | Selects MSB-first (BYTE low) or LSB-first (BYTE high) 8-bit byte readout sequence |
| R/C (Pin 24) | Read/Convert control input | Falling edge initiates conversion when CS is low; rising edge enables data output |
| CS (Pin 25) | Chip select input | OR'd with R/C; falling edge starts conversion if R/C is low, or enables output if R/C is high |
| BUSY (Pin 26) | Status output | Active-low during conversion; rising edge indicates valid data ready for latching |
| VANA / VDIG (Pins 27–28) | Analog and digital supply inputs | Both require 4.75V–5.25V; VDIG connected directly to VANA; separate bypassing required |
Key Features
| Feature | Design Value |
|---|---|
| Single 5V supply operation | Eliminates need for dual ±5V or ±15V rails - reduces BOM count and layout complexity |
| Guaranteed no missing codes | Ensures monotonic transfer function across full temperature range - essential for closed-loop control |
| Internal synchronized clock | Removes external crystal or oscillator requirement - simplifies timing design and improves jitter immunity |
| Microprocessor-compatible interface | Parallel 16-bit bus with CS/R/C/BUSY signals enables direct connection to FPGA, DSP, or MCU GPIO without glue logic |
| Bipolar ±10V input range | Directly interfaces with industrial transducers, strain gauges, and process voltage outputs without level-shifting circuitry |
Applications
| Industrial Process Control | Multiplexed Data Acquisition Systems |
|---|---|
Use Scenario: Monitoring pressure, temperature, and flow sensors in PLC-based factory automation cabinets. IC Role / Device Role / Timing Role: Primary ADC digitizing multiple ±10V sensor outputs via analog multiplexer; synchronized by system clock. Use Value: ±2.0LSB INL and no missing codes ensure accurate setpoint tracking and prevent control instability in feedback loops. | Use Scenario: High-channel-count test equipment scanning dozens of analog signals using analog switches and sample-and-hold arrays. IC Role / Device Role / Timing Role: Channel-specific ADC providing 100ksps per channel with deterministic 8µs conversion time. Use Value: Internal clock and BUSY signal enable precise inter-channel timing alignment without external timing coordination. |
| High-Speed PC-Based DAQ | Digital Signal Processing Front-End |
Use Scenario: ISA/PCI data acquisition cards capturing vibration or acoustic signals from accelerometers and microphones. IC Role / Device Role / Timing Role: High-resolution ADC feeding real-time FFT engines in host PC; parallel bus minimizes interface latency. Use Value: 87.5dB SINAD at 1kHz supports >14.5 ENOB - sufficient for 16-bit audio-grade spectral analysis. | Use Scenario: Pre-processing stage in motor control or power electronics inverters digitizing current/voltage feedback for FOC algorithms. IC Role / Device Role / Timing Role: Real-time analog front-end feeding DSP with synchronized 16-bit samples at fixed 10µs intervals. Use Value: 2µs acquisition time and 100ksps rate meet strict timing budgets for fast current loop updates in servo drives. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 16-bit, 100ksps sampling ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS7805UB | 16-bit, 100ksps, ±10V input, but requires external reference and clock; no internal reference or clock | Needs external 2.5V ref and 1MHz clock source - increases component count and layout sensitivity | Choose when external reference calibration or clock synchronization with other system clocks is required |
| AD976ARZ | 16-bit, 100ksps, ±10V input, internal reference, but uses serial SPI interface instead of parallel bus | Lacks native 16-bit parallel output - requires FPGA/MCU bit-banging or dedicated SPI controller | Prefer when board space is constrained and serial interface simplifies routing over wide parallel buses |
Compared with ADS7805UB and AD976ARZ, the LTC1605CN#PBF offers integrated timing and reference with minimal external components, while maintaining pin-compatible functionality with legacy Linear ADC designs - making it optimal for drop-in upgrades in existing 16-bit DAQ hardware.
Availability
LTC1605CN#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 and long-term obsolescence support.
Supply support for LTC1605CN#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 leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, formed through the acquisition of Linear Technology in 2017.
The LTC1605 series belongs to ADI's precision data acquisition product line, designed specifically for industrial and instrumentation applications demanding high DC accuracy, robust noise immunity, and simplified system integration.
FAQ
What is the operating temperature range for the LTC1605CN#PBF?
The LTC1605CN#PBF is rated for an operating ambient temperature range of 0°C to 70°C, as indicated by the "C" grade suffix in its part number. This commercial-grade specification applies to the 28-lead PDIP package variant and is validated per the Absolute Maximum Ratings table in the official datasheet. All DC and dynamic performance parameters - including ±2.0LSB INL, 100ksps sampling, and 87.5dB SINAD - are guaranteed across this full range. The LTC1605CN#PBF does not support extended industrial or automotive temperature grades.
Does the LTC1605CN#PBF require an external clock or reference to operate?
No, the LTC1605CN#PBF does not require an external clock or reference to operate. It integrates a factory-trimmed 2.5V bandgap reference and a synchronized internal clock optimized for 100ksps throughput. The internal reference establishes the ±10V full-scale input range (±4 × VREF), and the internal clock ensures deterministic 8µs conversion time without external timing components. An external reference may be applied to REF or CAP pins only if higher temperature stability or absolute accuracy is needed beyond the internal reference's ±5ppm/°C tempco.
How is the 16-bit output data formatted on the LTC1605CN#PBF?
The LTC1605CN#PBF outputs data in two's complement format, supporting both 16-bit word and two 8-bit byte read modes. When BYTE = low, D15–D8 carry the MSB byte and D7–D0 carry the LSB byte. When BYTE = high, the byte order swaps: D15–D8 output the LSB byte and D7–D0 output the MSB byte. Data becomes valid on the rising edge of BUSY, and the outputs enter high-impedance state when CS is high or R/C is low - enabling direct connection to shared microprocessor data buses without additional bus transceivers.
What are the absolute maximum ratings for analog input voltage on the LTC1605CN#PBF?
The absolute maximum analog input voltage rating for the LTC1605CN#PBF is ±25V on VIN (Pin 1), as specified in the Absolute Maximum Ratings table. This overvoltage protection remains functional even when the device is unpowered. Operation within the recommended ±10V input range ensures full DC and AC performance compliance, including ±2.0LSB INL and 87.5dB SINAD. Exceeding ±25V risks permanent damage due to internal ESD diode clamping limits, and sustained input voltages outside ±10V degrade linearity and noise performance even if below absolute max.
Can the LTC1605CN#PBF be used with a 3.3V digital interface?
No, the LTC1605CN#PBF cannot be interfaced directly with a 3.3V digital system. Its digital I/O pins (CS, R/C, BUSY, D15–D0, BYTE) are specified for 4.75V–5.25V operation, with VIH = 2.4V min and VOL = 0.10V max at VDD = 4.75V. Driving inputs with 3.3V logic violates the minimum high-level input voltage requirement and risks unreliable operation. Interfacing with 3.3V controllers requires level-shifting circuitry - such as dual-supply translators (e.g., TXB0108) or resistor-divider + Schmitt-trigger buffers - to ensure compatible voltage thresholds and drive strength.
LTC1605CN#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 28-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Obsolete
- 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:
- 0°C ~ 70°C
- Supplier Device Package:
- 28-PDIP
- Mounting Type:
- Through Hole
- Grade:
- -
- Qualification:
- -
LTC1605CN#PBF FAQ
1.How can I place an order for LTC1605CN#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1605CN#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 LTC1605CN#PBF reliable?
The price and inventory of LTC1605CN#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1605CN#PBF is usually 5 days.
3.What payment methods are accepted for LTC1605CN#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1605CN#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1605CN#PBF?
LTC1605CN#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1605CN#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 LTC1605CN#PBF?
For technical support, including LTC1605CN#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1605CN#PBF requirements.
6.How does Aetrix verify that LTC1605CN#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1605CN#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 LTC1605CN#PBF meets industry standards.
7.What is the process for return or replacement of LTC1605CN#PBF?
All LTC1605CN#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1605CN#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 LTC1605CN#PBF part is unused and in its original packaging.
Return procedure for LTC1605CN#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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