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Analog Devices Inc. LTC1605-2IG#PBF
- Part No.:
- LTC1605-2IG#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 28-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
LTC1605-2IG#PBF.pdf
- Description:
- IC ADC 16BIT SAR 28SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,545
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Product details
Overview
LTC1605-2IG#PBF from Analog Devices (formerly Linear Technology) is a 16-bit, 100ksps successive approximation ADC with bipolar ±4V input range, internal 2.5V reference and trimmed clock, operating from a single 5V supply and consuming 55mW typical power. It integrates sample-and-hold, precision reference buffer (CAP pin), and parallel 16-bit or byte-mode digital interface - used in industrial data acquisition systems requiring high-resolution analog-to-digital conversion without external timing or reference components.
For engineers reviewing the LTC1605-2IG#PBF datasheet, LTC1605-2IG#PBF pinout, LTC1605-2IG#PBF application, or LTC1605-2IG#PBF equivalent, key selection criteria include bipolar input range compatibility, 86dB SNR performance, SSOP-28 package thermal characteristics, and microprocessor/DSP interface timing (BUSY, R/C, CS, BYTE).
Technical Context
The LTC1605-2IG#PBF implements a switched-capacitor SAR architecture with auto-zeroed comparator and 16-bit capacitive DAC, supporting unbuffered analog inputs up to ±25V with 10kΩ input impedance and 10pF capacitance. Its internal 2.5V bandgap reference is curvature-corrected and factory-trimmed to ±0.5% initial accuracy, enabling ±4V full-scale range via 1.6× scaling.
Conversion is initiated by edge-triggered R/C or CS signals, with fixed 8µs conversion time and 2µs acquisition window. Output data is formatted in two's complement for bipolar operation and delivered via 16-bit parallel bus (D15–D0) with three-state control synchronized to BUSY and BYTE logic.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16-bit - delivers 65,536 discrete output codes for high-fidelity signal digitization |
| Sampling Rate | 100ksps - supports real-time capture of signals up to 275kHz full-power bandwidth |
| Analog Input Range | ±4V - enables direct digitization of bipolar sensor outputs, differential transducer signals, or AC-coupled waveforms |
| Signal-to-Noise Ratio | 86dB typical - ensures ≥14.3 effective bits (ENOB) at 1kHz input under specified conditions |
| Power Dissipation | 55mW typical at 5V - allows integration into thermally constrained industrial modules without active cooling |
| Integral Linearity Error | ±3 LSB max - guarantees monotonicity and <0.046% full-scale error across temperature |
| Reference Voltage | 2.500V ±10mV (typ) - stable internal reference eliminates need for external precision voltage source |
Pinout & Package
Package: 28-lead plastic SSOP (G package), exposed pad soldered to PCB ground for thermal and noise performance; θJA = 95°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (1) | Analog input | Accepts ±4V bipolar signal; overvoltage protected to ±25V; requires 200Ω series resistor per layout guidance |
| AGND1 (2), AGND2 (5) | Analog ground | Separate analog return paths minimize digital coupling; must tie to low-impedance analog ground plane |
| REF (3) | 2.5V reference output | Provides factory-trimmed bandgap reference; bypass with 2.2µF tantalum for low-noise operation |
| CAP (4) | Reference buffer output | Drives internal DAC; capable of ≤2mA DC load; decouple with 2.2µF tantalum to maintain linearity |
| D15–D0 (6–13, 15–22) | Three-state parallel data outputs | Deliver 16-bit two's complement code; Hi-Z when CS high or R/C low; BYTE pin selects MSB-first or LSB-first byte order |
| BUSY (26) | Conversion status indicator | Active-low open-drain output; data valid on rising edge; asserts minimum 8µs low time during conversion |
| R/C (24) | Read/Convert control | Falling edge initiates conversion when CS low; rising edge enables data output; pulse width ≥40ns required |
| CS (25) | Chip select | OR'd internally with R/C; falling edge starts conversion if R/C low, or enables output if R/C high |
| BYTE (23) | Byte mode select | Low: D15–D8 = MSB byte, D7–D0 = LSB byte; High: D15–D8 = LSB byte, D7–D0 = MSB byte |
| VANA (27), VDIG (28) | Analog/digital supplies | Both require 4.75V–5.25V; VANA bypassed with 0.1µF ceramic + 10µF tantalum; VDIG tied directly to VANA |
Key Features
| Feature | Design Value |
|---|---|
| Bipolar ±4V input range | Enables direct digitization of AC-coupled, differential, or dual-supply sensor outputs without level-shifting circuitry |
| Internal 2.5V reference with CAP buffer | Eliminates external reference IC and reduces BOM count while maintaining ±5ppm/°C tempco and 2.500V ±10mV accuracy |
| Microprocessor-compatible parallel interface | Supports both 16-bit word and two-byte read modes via BYTE pin, simplifying integration with 8-bit microcontrollers and DSPs |
| 86dB SNR and ±3 LSB INL | Meets requirements for precision instrumentation, process control, and high-fidelity data logging applications |
| SSOP-28 package with exposed thermal pad | Provides compact footprint and enhanced thermal dissipation (θJA = 95°C/W) for industrial ambient temperatures up to +85°C |
Applications
| Industrial Process Control | Multiplexed Data Acquisition Systems |
|---|---|
|
Use Scenario: Digitizing 4–20mA current loop outputs and thermocouple signals in PLC I/O modules. IC Role / Device Role / Timing Role: Primary ADC converting conditioned analog sensor outputs to 16-bit digital values synchronized to system scan cycle. Use Value: ±4V input range accepts bipolar transducer outputs directly; 86dB SNR ensures accurate representation of low-level sensor signals amid industrial EMI. |
Use Scenario: Scanning multiple analog channels (e.g., 16-channel DAQ) using external multiplexer and sample-and-hold. IC Role / Device Role / Timing Role: High-speed sampling ADC triggered by multiplexer channel select logic; BUSY signal coordinates data capture timing. Use Value: 100ksps throughput enables ≥6.25ksps per channel across 16 inputs; internal clock removes timing jitter from external sources. |
| High-Speed PC-Based Data Acquisition | Digital Signal Processing Front-End |
|
Use Scenario: USB or PCIe DAQ cards acquiring vibration, audio, or acoustic emission signals from sensors. IC Role / Device Role / Timing Role: Precision front-end ADC feeding FPGA or microcontroller for real-time FFT and spectral analysis. Use Value: 275kHz full-power bandwidth supports ultrasound and mechanical resonance detection; two's complement output aligns with DSP arithmetic units. |
Use Scenario: Real-time signal conditioning in motor control, power quality monitoring, or communications baseband processing. IC Role / Device Role / Timing Role: High-resolution ADC providing input samples to DSP for adaptive filtering, harmonic analysis, or closed-loop feedback. Use Value: ±3 LSB INL preserves signal integrity for control algorithm convergence; 8µs conversion time enables tight servo loop timing budgets. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 16-bit SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS8860IDRCT | 16-bit, 1MSPS, SPI interface, external reference required, no internal clock | Higher speed but serial interface increases MCU overhead; lacks integrated reference and bipolar input support | Select when >100ksps sampling or space-constrained PCB favors SPI; verify external reference stability meets ±4V full-scale accuracy |
| AD7606BSTZ | 16-bit, 200ksps, simultaneous sampling, 8-channel, parallel/SPI, ±10V input range | Multi-channel architecture adds complexity for single-input use; higher power (120mW) and larger LQFP-64 package | Prefer for multi-sensor systems needing synchronized acquisition; avoid for cost- or size-sensitive single-channel designs |
Compared with ADS8860IDRCT and AD7606BSTZ, the LTC1605-2IG#PBF offers unique integration of bipolar ±4V input, internal reference, and parallel interface in a compact SSOP-28 package - reducing component count and layout complexity for single-channel industrial DAQ where 100ksps suffices.
Availability
LTC1605-2IG#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, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for LTC1605-2IG#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 technologies, serving industrial, automotive, communications, and healthcare markets.
The LTC1605-2IG#PBF belongs to Linear Technology's legacy precision data acquisition product line, designed specifically for high-resolution, low-power, single-supply industrial ADC applications where ease of use and minimal external components are critical.
FAQ
What is the input voltage range supported by the LTC1605-2IG#PBF?
The LTC1605-2IG#PBF supports a bipolar analog input range of ±4V, corresponding to a full-scale span of 8V. This is achieved via internal 1.6× scaling of its 2.5V reference. The device tolerates momentary overvoltage up to ±25V on VIN without latch-up, making it robust for industrial transducer interfaces. Input impedance is 10kΩ with 10pF capacitance.
Does the LTC1605-2IG#PBF require an external clock or reference?
No, the LTC1605-2IG#PBF does not require an external clock or reference. It includes a factory-trimmed internal clock enabling guaranteed 100ksps operation and a curvature-corrected 2.5V bandgap reference with ±10mV initial accuracy. An external reference may be applied to REF or CAP pins only if improved temperature stability or absolute accuracy is needed beyond the internal specification.
How is data output formatted from the LTC1605-2IG#PBF?
The LTC1605-2IG#PBF outputs data in two's complement format to support its ±4V bipolar input range. The 16-bit result appears on D15–D0 pins either as a full word (BYTE = low) or split into two bytes (BYTE = high). Data becomes valid on the rising edge of the BUSY signal, and outputs enter high-impedance state when CS is high or R/C is low.
What package type and temperature grade does the LTC1605-2IG#PBF use?
The LTC1605-2IG#PBF uses a 28-lead plastic SSOP (G package) with exposed thermal pad, rated for –40°C to +85°C industrial temperature operation. The exposed pad must be soldered to PCB ground for optimal thermal performance (θJA = 95°C/W) and noise immunity. This package replaces obsolete PDIP variants and is RoHS-compliant with lead-free finish.
Can the LTC1605-2IG#PBF interface directly with an 8-bit microcontroller?
Yes, the LTC1605-2IG#PBF supports direct interface with 8-bit microcontrollers via its BYTE-selectable two-byte output mode. When BYTE = high, the upper and lower bytes swap positions on the bus (D15–D8 carry LSBs, D7–D0 carry MSBs), allowing sequential 8-bit reads without bit-shifting. Control signals (CS, R/C, BUSY) are TTL-compatible and operate at 5V logic levels.
LTC1605-2IG#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 28-SSOP (0.209", 5.30mm 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-SSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC1605-2IG#PBF FAQ
1.How can I place an order for LTC1605-2IG#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1605-2IG#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 LTC1605-2IG#PBF reliable?
The price and inventory of LTC1605-2IG#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1605-2IG#PBF is usually 5 days.
3.What payment methods are accepted for LTC1605-2IG#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1605-2IG#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1605-2IG#PBF?
LTC1605-2IG#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1605-2IG#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 LTC1605-2IG#PBF?
For technical support, including LTC1605-2IG#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1605-2IG#PBF requirements.
6.How does Aetrix verify that LTC1605-2IG#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1605-2IG#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 LTC1605-2IG#PBF meets industry standards.
7.What is the process for return or replacement of LTC1605-2IG#PBF?
All LTC1605-2IG#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1605-2IG#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 LTC1605-2IG#PBF part is unused and in its original packaging.
Return procedure for LTC1605-2IG#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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