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Analog Devices Inc. LTC1609IG#PBF
- Part No.:
- LTC1609IG#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 28-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
LTC1609IG#PBF.pdf
- Description:
- IC ADC 16BIT SAR 28SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:156
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Product details
Overview
LTC1609IG#PBF from Analog Devices (formerly Linear Technology) is a 16-bit, 200ksps serial analog-to-digital converter with integrated sample-and-hold, precision 2.5V reference, and internal clock. It operates from a single 5V supply, delivers ±2LSB INL and guaranteed no missing codes over temperature, and supports bipolar (±10V/±5V/±3.3V) and unipolar (0V–10V/0V–5V/0V–4V) input ranges. It is used in high-speed industrial data acquisition systems requiring stable DC accuracy and low power.
For engineers reviewing the LTC1609IG#PBF datasheet, LTC1609IG#PBF pinout, LTC1609IG#PBF application, or LTC1609IG#PBF equivalent, key selection considerations include its 28-pin SSOP package, dual ground separation (AGND1/AGND2/DGND), SB/BTC format control, EXT/INT clock select, and guaranteed 87dB SNR at 200ksps - all critical for noise-sensitive mixed-signal designs.
Technical Context
The LTC1609IG#PBF employs a switched-capacitor successive approximation architecture with auto-zeroed comparator and 16-bit capacitive DAC. Its conversion cycle includes a 2µs acquisition phase followed by a 3µs conversion time, achieving full throughput in 5µs. Internal trimming ensures ±2LSB integral linearity error across –40°C to +85°C.
It features dual-domain grounding (separate AGND1, AGND2, DGND), configurable output coding (straight binary or two's complement via SB/BTC), and flexible serial interface timing - supporting either internal DATACLK generation or external clock synchronization via EXT/INT. The CAP pin provides buffered 2.5V reference output with 2.2µF tantalum decoupling requirement.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16-bit - delivers 1 LSB = 153 µV for ±5V range, enabling sub-millivolt measurement fidelity |
| Sample Rate | 200 ksps - supports real-time capture of signals up to 100 kHz Nyquist bandwidth |
| INL | ±2 LSB max - ensures monotonicity and <0.003% full-scale linearity error over temperature |
| SNR | 87 dB typical - achieves 14.2 effective bits (ENOB) at 1 kHz input, suitable for precision instrumentation |
| Power Dissipation | 65 mW typical at 200 ksps - enables thermally constrained embedded systems without forced cooling |
| Input Ranges | ±10V, ±5V, ±3.3V, 0–10V, 0–5V, 0–4V - selectable via external resistor networks on R1IN/R2IN/R3IN pins |
| Reference | Internal 2.5 V ±0.2% trimmed bandgap - eliminates need for external reference unless higher accuracy required |
Pinout & Package
Package: 28-lead plastic SSOP (G package), 0.209" body width, JEDEC MS-013AC compliant. Requires separate analog (AGND1, AGND2) and digital (DGND) ground planes with star-point connection.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| R1IN, R2IN, R3IN | Analog input terminals | Configurable for six input ranges via external resistor dividers; overvoltage protected to ±25V |
| AGND1, AGND2 | Analog ground references | Separate return paths for input stage and reference buffer; must be tied together at single point near device |
| CAP | Reference buffer output | Provides 2.5 V buffered reference for internal DAC; requires 2.2 µF tantalum bypass to AGND2 |
| REF | Reference voltage output | 2.5 V bandgap source; can be overdriven by external reference for improved accuracy |
| SB/BTC | Data format select | High = straight binary (0–65535); low = two's complement (−32768 to +32767) |
| EXT/INT | Serial clock source select | High = external DATACLK used; low = internal clock drives DATACLK during conversion |
| R/C | Read/Convert control | Falling edge (with CS low) initiates conversion; rising edge enables serial output |
| BUSY | Conversion status indicator | Active-low signal; data valid on rising edge; used for handshaking with FIFOs or microcontrollers |
| PWRD | Power-down enable | High = shutdown mode (50 µW); retains last conversion result in shift register |
| VANA, VDIG | Analog/digital supplies | Both require 4.75–5.25 V; VDIG connected directly to VANA; bypass with 0.1 µF ceramic + 10 µF tantalum |
Key Features
| Feature | Design Value |
|---|---|
| Guaranteed no missing codes | Ensures monotonic response across full 16-bit range - essential for closed-loop control and servo applications |
| Integrated 2.5 V reference with ±5 ppm/°C tempco | Eliminates external reference IC and associated layout complexity while maintaining <0.01% drift over –40°C to +85°C |
| Configurable input ranges via pin-strapping | Supports six standard ranges using only three resistors - reduces BOM count and simplifies range-switching firmware |
| Separate analog and digital grounds | Minimizes digital switching noise coupling into sensitive analog front-end - critical for achieving 87 dB SNR |
| Power-down mode with data retention | Reduces idle power to 50 µW while preserving last conversion result - ideal for battery-powered DAQ nodes |
Applications
| Industrial Process Monitoring | PC-Based High-Speed DAQ |
|---|---|
|
Use Scenario: Continuous monitoring of pressure, temperature, and flow sensor outputs in PLC I/O modules. IC Role / Device Role / Timing Role: Primary ADC digitizing multiple ±10V industrial sensor signals with synchronized sampling and low-latency serial readout. Use Value: ±2 LSB INL and 87 dB SNR ensure traceable calibration compliance; 200 ksps throughput supports multi-channel interleaved sampling at >30 kS/s per channel. |
Use Scenario: Add-on data acquisition card for test benches capturing transient waveforms from vibration or acoustic sensors. IC Role / Device Role / Timing Role: High-fidelity front-end ADC interfacing to FPGA or microcontroller via SPI-compatible serial bus with BUSY handshake. Use Value: Internal clock and REF/CAP buffers simplify board-level timing design; 28-pin SSOP allows compact PCB layout matching PCIe or USB DAQ form factors. |
| Multiplexed Sensor Systems | DSP-Front-End Signal Conditioning |
|
Use Scenario: 16-channel thermocouple or strain-gauge system using external multiplexer and programmable gain amplifier. IC Role / Device Role / Timing Role: Precision ADC receiving conditioned analog inputs; SB/BTC and EXT/INT pins enable seamless integration with multiplexer timing control. Use Value: Configurable input impedance (10kΩ–22.9kΩ) matches common PGAs; TAG pin supports daisy-chained serial output for multi-ADC synchronization. |
Use Scenario: Real-time signal preprocessing stage feeding TI C6000 or Analog Devices SHARC DSPs in audio or motor control systems. IC Role / Device Role / Timing Role: Low-jitter, low-noise ADC providing clean 16-bit samples to DSP serial port with minimal glue logic. Use Value: Aperture jitter <1 ps RMS enables accurate phase measurement; BUSY and SYNC signals align conversion start with DSP frame boundaries. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 16-bit serial ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS7809UB | 16-bit, 100 ksps, single-supply 5V, but lacks internal reference and requires external 2.5V ref; 24-pin SOIC package | Lower throughput and no integrated reference increase BOM cost and layout area; suited for cost-sensitive, lower-speed systems | Select ADS7809UB only if throughput ≤100 ksps suffices and external reference is already present in design |
| AD977AARZ | 16-bit, 100 ksps, ±5V dual supply required; includes internal reference but no SB/BTC format control; 28-pin SOIC | Dual-supply operation complicates power design; fixed two's complement output limits flexibility in microcontroller interfacing | Choose AD977AARZ when legacy ±5V analog rails exist and straight-binary output is not required |
Compared with LTC1609IG#PBF, ADS7809UB trades throughput and integration for lower unit cost, while AD977AARZ sacrifices speed and supply simplicity for mature process reliability - making LTC1609IG#PBF optimal for new 5V, high-fidelity, space-constrained DAQ designs.
Availability
LTC1609IG#PBF is available at Aetrix Electronics and suitable for industrial process control, PC-based data acquisition, multiplexed sensor systems, and DSP-front-end signal conditioning requiring stable component supply across extended temperature ranges.
Supply support for LTC1609IG#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 LTC1609IG#PBF belongs to Linear Technology's precision data acquisition product line, designed specifically for industrial and instrumentation applications demanding high DC accuracy, low noise, and robust serial interface capability in compact packages.
FAQ
What is the operating temperature range for the LTC1609IG#PBF?
The LTC1609IG#PBF is rated for industrial temperature operation from –40°C to +85°C. This is confirmed by the "I" grade suffix in the part number and specified in the Absolute Maximum Ratings table. All key AC and DC performance parameters - including ±2 LSB INL, 87 dB SNR, and 200 ksps throughput - are guaranteed across this full range, making LTC1609IG#PBF suitable for harsh environments such as factory automation and outdoor monitoring equipment.
Does the LTC1609IG#PBF require an external reference voltage?
No, the LTC1609IG#PBF includes a factory-trimmed 2.5 V internal bandgap reference with ±5 ppm/°C temperature coefficient. The REF pin provides direct access to this reference, and the CAP pin delivers a buffered version for driving the internal DAC. An external reference may be applied to REF only if higher initial accuracy or lower long-term drift is required - but it is not necessary for standard operation of LTC1609IG#PBF.
How is the input range selected on the LTC1609IG#PBF?
The LTC1609IG#PBF supports six input ranges (±10V, ±5V, ±3.3V, 0–10V, 0–5V, 0–4V) by configuring external resistors on R1IN, R2IN, and R3IN pins as defined in Tables 1a and 1b of the datasheet. No configuration registers or digital commands are needed - range selection is purely hardware-based via resistor networks, ensuring deterministic behavior and eliminating firmware dependencies in LTC1609IG#PBF-based systems.
Can the LTC1609IG#PBF interface directly with an FPGA or microcontroller SPI port?
Yes, the LTC1609IG#PBF supports SPI-compatible serial communication using CS, DATACLK, DATA, and BUSY signals. While not a true SPI slave (no MOSI/MISO naming), its timing - including t10 setup (15 ns) and t11 hold (40 ns) - meets standard 5V-tolerant MCU/FPGA interface requirements. The BUSY signal provides ready-to-read indication, and SYNC enables precise frame alignment - enabling robust, low-glitch interfacing with LTC1609IG#PBF in real-time embedded systems.
What is the purpose of the TAG pin on the LTC1609IG#PBF?
The TAG pin on the LTC1609IG#PBF enables daisy-chained serial output in external clock mode (EXT/INT = high). When CS is low and R/C is high after conversion, the level present on TAG at conversion start is shifted out on the DATA line after the 16-bit result. This allows multiple LTC1609IG#PBF devices to share a single DATACLK and DATA line, with each contributing its conversion result plus a unique tag - simplifying multi-channel expansion without additional control lines.
LTC1609IG#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):
- 200k
- Number of Inputs:
- 1
- Input Type:
- Single Ended
- Data Interface:
- SPI
- 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:
- -
LTC1609IG#PBF FAQ
1.How can I place an order for LTC1609IG#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1609IG#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 LTC1609IG#PBF reliable?
The price and inventory of LTC1609IG#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1609IG#PBF is usually 5 days.
3.What payment methods are accepted for LTC1609IG#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1609IG#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1609IG#PBF?
LTC1609IG#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1609IG#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 LTC1609IG#PBF?
For technical support, including LTC1609IG#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1609IG#PBF requirements.
6.How does Aetrix verify that LTC1609IG#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1609IG#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 LTC1609IG#PBF meets industry standards.
7.What is the process for return or replacement of LTC1609IG#PBF?
All LTC1609IG#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1609IG#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 LTC1609IG#PBF part is unused and in its original packaging.
Return procedure for LTC1609IG#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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