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Analog Devices Inc. LTC1608AIG#PBF
- Part No.:
- LTC1608AIG#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 36-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
LTC1608AIG#PBF.pdf
- Description:
- IC ADC 16BIT SAR 36SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,905
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Product details
Overview
LTC1608AIG#PBF from Analog Devices (formerly Linear Technology) is a 16-bit, 500ksps successive-approximation analog-to-digital converter with differential input, internal ±15ppm/°C reference, and dual shutdown modes (7mW Nap, 10µW Sleep). It delivers 90dB S/(N+D) and –100dB THD at full speed and operates from ±5V supplies in a 36-pin SSOP package. It is used in high-speed data acquisition systems requiring precise bipolar signal digitization.
For engineers reviewing the LTC1608AIG#PBF datasheet, LTC1608AIG#PBF pinout, LTC1608AIG#PBF application, or LTC1608AIG#PBF equivalent, key selection considerations include its true differential input architecture (68dB CMRR), absence of pipeline delay, guaranteed no missing codes over temperature, and µP-compatible 16-bit parallel interface with BUSY strobe timing.
Technical Context
The LTC1608AIG#PBF employs a capacitor-based successive approximation register (SAR) architecture with integrated differential sample-and-hold, achieving 15MHz small-signal input bandwidth and 5MHz full-power bandwidth. Its internal clock is factory-trimmed for 1.45µs typical conversion time and guarantees ≤2µs throughput (acquisition + conversion).
It features separate analog (AVDD/AGND), digital logic (DVDD/DGND), and output driver (OVDD/OGND) supply domains to minimize noise coupling. The reference subsystem includes a 2.5V bandgap output (VREF) and a 4.375V compensation node (REFCOMP), both requiring dedicated bypassing per layout guidelines.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16-bit with guaranteed no missing codes over temperature - ensures monotonicity in closed-loop control and precision measurement. |
| Sampling Rate | 500ksps maximum - supports real-time capture of signals up to 250kHz Nyquist bandwidth. |
| S/(N+D) Ratio | 90dB at 5kHz input - enables >14.6 effective bits for low-frequency sensor and instrumentation applications. |
| THD | –100dB at 5kHz - minimizes harmonic distortion in audio and spectral analysis systems. |
| Input Range | ±2.5V differential - matches standard industrial transducer outputs without level-shifting circuitry. |
| Power Dissipation | 270mW typical at full speed; 7mW in Nap mode - allows thermal management in dense PCB layouts. |
| Common Mode Rejection | 68dB - suppresses ground loop noise and EMI in noisy industrial environments. |
Pinout & Package
Package: 36-lead plastic SSOP (G package), 0.209" body width, 0.025" lead pitch. RoHS-compliant, lead-free (Pb-free) finish per #PBF suffix.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AIN+ (1), AIN– (2) | Differential analog input pair | Acquires simultaneous voltage difference; supports single-ended use (AIN– grounded) or fully differential signaling with 68dB CMRR. |
| VREF (3) | 2.5V reference output | Provides buffered internal reference; requires 2.2µF tantalum + 0.1µF ceramic bypass to AGND for stability. |
| REFCOMP (4) | Reference compensation node | Stabilizes internal reference amplifier; must be bypassed with ≥22µF tantalum + 0.1µF ceramic to AGND. |
| AGND (5–8) | Analog ground return | Four dedicated pins for low-impedance analog ground plane connection; critical for noise isolation. |
| DVDD (9), DGND (10) | Digital logic supply/ground | Isolates core logic from output drivers; decoupling required with 10µF + 0.1µF per supply pin. |
| D15–D0 (11–26) | 16-bit three-state parallel data bus | Outputs two's complement binary code; enabled by CS and RD; compatible with 3V or 5V µP buses via OVDD control. |
| BUSY (27) | Conversion status indicator | Active-low open-drain signal; rising edge marks valid data - eliminates need for external timing delays. |
| OGND (28), OVDD (29) | Output driver supply/ground | Independent power domain for digital outputs; sets logic swing (3V or 5V) without affecting internal logic. |
| RD (30), CONVST (31), CS (32) | Control interface inputs | Standard memory-mapped timing: CS selects device, CONVST starts conversion on falling edge, RD latches data. |
| SHDN (33) | Power shutdown control | Low-active pin; Nap mode (CS low) or Sleep mode (CS high) selected dynamically during operation. |
| VSS (34) | Negative analog supply | –5V rail; requires 10µF + 0.1µF bypass to AGND; absolute max –6V. |
| AVDD (35–36) | Positive analog supply | 5V rail; dual pins reduce IR drop; connected via 10Ω resistor; each requires 10µF + 0.1µF bypass to AGND. |
Key Features
| Feature | Design Value |
|---|---|
| True differential input architecture | Enables rejection of common-mode noise up to 68dB across 100kHz, eliminating ground loops in motor drive feedback or sensor interfaces. |
| No pipeline delay | Delivers first valid conversion result after exactly one acquisition + conversion cycle (≤2µs), essential for deterministic real-time control loops. |
| Two-tier power shutdown | Nap mode (7mW) retains reference and logic state for <200ns wake-up; Sleep mode (10µW) cuts all bias current for ultra-low-power standby. |
| Internal 2.5V reference with ±15ppm/°C tempco | Eliminates external reference component count while maintaining <±0.125% full-scale error over –40°C to +85°C. |
| 3V/5V I/O compatibility | Separate OVDD pin allows direct interfacing to mixed-voltage systems without level shifters or bus contention risks. |
Applications
| Telecommunications Baseband Digitization | Digital Signal Processing Front-End |
|---|---|
Use Scenario: Digitizing IF signals in wireless infrastructure receivers before FPGA-based demodulation. IC Role / Device Role / Timing Role: High-fidelity ADC capturing 200kHz–2MHz baseband waveforms with minimal harmonic distortion. Use Value: 90dB S/(N+D) preserves SNR margin for QAM-256 constellations; differential inputs reject RF coupling from adjacent PA stages. |
Use Scenario: Feeding real-time sensor data into TI C6000 or Analog Devices SHARC DSPs for vibration analysis. IC Role / Device Role / Timing Role: Memory-mapped peripheral providing synchronized 16-bit samples via BUSY strobe for zero-wait-state DMA transfers. Use Value: No pipeline delay ensures deterministic sample-to-processing latency; 500ksps throughput meets Nyquist requirements for 200Hz–250kHz mechanical resonance detection. |
| Multiplexed Industrial Data Acquisition | High-Speed Imaging Sensor Interface |
Use Scenario: Scanning 16-channel thermocouple or strain gauge array using external analog multiplexer. IC Role / Device Role / Timing Role: Precision ADC with ±2.5V input range accepting conditioned mV-level signals directly. Use Value: Guaranteed no missing codes prevents step errors in calibration-critical measurements; 68dB CMRR rejects noise from shared 24V DC power rails. |
Use Scenario: Capturing line-scan CCD or CMOS sensor outputs in non-destructive testing equipment. IC Role / Device Role / Timing Role: High-speed sampling ADC with 5MHz full-power bandwidth acquiring transient pixel charge pulses. Use Value: 15MHz input bandwidth supports fast settling of short-duration analog pulses; 16-bit resolution resolves sub-LSB intensity variations in defect detection. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-speed SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7606BSTZ | 8-channel simultaneous sampling, 16-bit, 200ksps, internal reference, SPI interface - lower speed, higher channel count, serial interface only. | Best for multi-channel synchronized acquisition where parallel bus is unnecessary and lower throughput suffices. | Select AD7606BSTZ when system requires 8-channel correlation (e.g., power quality monitoring) and can accept 200ksps/channel with SPI host integration. |
| LTC2378-16IUKG#PBF | Single-ended input, 16-bit, 1Msps, no internal reference, SPI interface, 1.5µs conversion - higher speed, no differential input, no internal ref, serial-only. | Preferred for space-constrained designs needing >500ksps with external reference control and minimal pin count. | Select LTC2378-16IUKG#PBF when board area is limited, differential input is not required, and SPI interface simplifies routing versus 16-bit parallel bus. |
Compared with AD7606BSTZ and LTC2378-16IUKG#PBF, the LTC1608AIG#PBF uniquely combines true differential input, µP-compatible parallel interface, and dual shutdown modes - making it optimal for legacy microprocessor-based systems requiring deterministic timing, noise immunity, and flexible power management without redesigning the data path.
Availability
LTC1608AIG#PBF is available at Aetrix Electronics and suitable for telecommunications baseband digitization, digital signal processing front-ends, and multiplexed industrial data acquisition requiring stable component supply across extended temperature ranges.
Supply support for LTC1608AIG#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, serving industrial, automotive, communications, and healthcare markets.
The LTC1608AIG#PBF belongs to ADI's legacy Linear Technology precision data conversion product line, designed specifically for high-speed, high-accuracy applications where low distortion, differential input capability, and robust timing control are critical.
FAQ
What is the operating temperature range for the LTC1608AIG#PBF?
The LTC1608AIG#PBF is rated for –40°C to +85°C (Industrial grade, denoted by 'I' in the part number). This range is validated across all key specifications including integral linearity error (±0.5 LSB), offset tempco (0.5 ppm/°C), and full-scale tempco (±15 ppm/°C), ensuring reliable performance in harsh industrial environments without derating.
Does the LTC1608AIG#PBF require an external clock source?
No, the LTC1608AIG#PBF contains a fully integrated, factory-trimmed internal clock that drives the successive approximation process. It achieves a typical conversion time of 1.45µs and guarantees ≤1.8µs maximum over temperature - eliminating external clock components, jitter concerns, and layout complexity associated with clock distribution.
How does the LTC1608AIG#PBF handle power supply noise on AVDD and VSS?
The LTC1608AIG#PBF specifies strict bypassing requirements: each AVDD pin (35, 36) and VSS (34) must be decoupled with a 10µF tantalum capacitor in parallel with a 0.1µF ceramic capacitor to AGND. This dual-capacitor network suppresses both low-frequency ripple and high-frequency switching noise, maintaining 90dB S/(N+D) performance even with ±5% supply variation.
Can the LTC1608AIG#PBF interface directly with a 3.3V microprocessor?
Yes - the LTC1608AIG#PBF supports 3V I/O compatibility via its dedicated OVDD pin (Pin 29). By supplying OVDD at 3.3V (with appropriate bypassing), the D15–D0 outputs and BUSY signal swing between 0V and 3.3V, while digital inputs (CS, RD, CONVST, SHDN) accept 3.3V logic levels directly, enabling seamless integration with modern low-voltage µPs without level shifters.
What is the significance of the 'A' in LTC1608AIG#PBF?
The 'A' in LTC1608AIG#PBF denotes the specific grade of integral linearity error: ±0.5 LSB (typical) and ±2 LSB (max) over temperature, tighter than the base LTC1608 (±1 LSB typ, ±4 LSB max). This enhanced linearity makes the LTC1608AIG#PBF preferred for metrology-grade applications such as calibration equipment and high-end test instrumentation where code-edge accuracy is critical.
LTC1608AIG#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 36-SSOP (0.209", 5.30mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Number of Bits:
- 16
- Sampling Rate (Per Second):
- 500k
- Number of Inputs:
- 1
- Input Type:
- Differential, 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:
- 36-SSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC1608AIG#PBF FAQ
1.How can I place an order for LTC1608AIG#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1608AIG#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 LTC1608AIG#PBF reliable?
The price and inventory of LTC1608AIG#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1608AIG#PBF is usually 5 days.
3.What payment methods are accepted for LTC1608AIG#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1608AIG#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1608AIG#PBF?
LTC1608AIG#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1608AIG#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 LTC1608AIG#PBF?
For technical support, including LTC1608AIG#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1608AIG#PBF requirements.
6.How does Aetrix verify that LTC1608AIG#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1608AIG#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 LTC1608AIG#PBF meets industry standards.
7.What is the process for return or replacement of LTC1608AIG#PBF?
All LTC1608AIG#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1608AIG#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 LTC1608AIG#PBF part is unused and in its original packaging.
Return procedure for LTC1608AIG#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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