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Analog Devices Inc. LTC1608ACG#PBF
- Part No.:
- LTC1608ACG#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 36-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
LTC1608ACG#PBF.pdf
- Description:
- IC ADC 16BIT SAR 36SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:486
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Product details
Overview
LTC1608ACG#PBF from Analog Devices (formerly Linear Technology) is a high-speed, 16-bit, 500ksps successive-approximation ADC with differential analog inputs, internal ±15ppm/°C reference, and dual shutdown modes (7mW Nap, 10µW Sleep). It delivers 90dB S/(N+D) and –100dB THD at full sample rate and operates from ±5V supplies. It serves as a complete, pin-compatible upgrade to the LTC1604 in high-fidelity data acquisition systems.
For engineers reviewing the LTC1608ACG#PBF datasheet, LTC1608ACG#PBF pinout, LTC1608ACG#PBF application, or LTC1608ACG#PBF equivalent, key selection criteria include its ±2.5V bipolar input range, 36-pin SSOP package, no pipeline delay, guaranteed no missing codes over temperature, and µP-compatible 16-bit parallel interface with BUSY strobe.
Technical Context
The LTC1608ACG#PBF employs a fully differential capacitive DAC-based SAR architecture with integrated sample-and-hold, achieving 15MHz small-signal bandwidth and 68dB common-mode rejection. Its internal clock is factory-trimmed for 1.45µs typical conversion time and guarantees ≤2µs throughput (acquisition + conversion).
It supports true differential or single-ended analog inputs, uses two's-complement output coding, and features separate digital output supply (OVDD) for 3V/5V system compatibility. Power management is controlled via SHDN and CS pins to select Nap (digital logic + reference active) or Sleep (leakage-only) mode.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16-bit with guaranteed no missing codes over 0°C to 70°C operating range |
| Sampling Rate | 500ksps maximum - enables real-time capture of signals up to 250kHz Nyquist bandwidth |
| S/(N+D) | 90dB at 5kHz input - ensures high dynamic range for precision measurement applications |
| THD | –100dB at 5kHz input - minimizes harmonic distortion in audio and spectral analysis |
| Input Range | ±2.5V differential - optimized for low-noise performance without external level-shifting circuitry |
| Power Dissipation | 270mW typical at 500ksps - balances speed and thermal load in compact designs |
| Acquisition Time | 400ns maximum - defines minimum analog settling window before conversion start |
Pinout & Package
Package: 36-lead plastic SSOP (G package), 0.209" body width, JEDEC MO-153 compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AIN+, AIN– (1, 2) | Differential analog input pair | Accepts ±2.5V differential signal; 68dB CMRR enables noise-rejecting measurements from noisy environments |
| VREF (3) | 2.5V reference output | Internally trimmed bandgap reference; bypassed with 2.2µF + 0.1µF for stability and low noise |
| REFCOMP (4) | Reference compensation node | Requires 22µF + 0.1µF bypass to AGND; stabilizes internal reference amplifier |
| AGND (5–8) | Analog ground terminals | Must connect to low-impedance analog ground plane; separates analog return paths from digital |
| DVDD (9), DGND (10) | Digital logic supply/ground | Powers internal timing and control logic; DGND ties to AGND at single point |
| D15–D0 (11–26) | 16-bit three-state parallel data outputs | Two's-complement format; output voltage swing set by OVDD (3V or 5V compatible) |
| BUSY (27) | Conversion status indicator | Active-low open-drain signal; rising edge marks valid data ready for latching |
| OGND, OVDD (28, 29) | Output driver ground/supply | Isolates output buffer power domain; enables interfacing to mixed-voltage systems |
| RD (30) | Read enable input | Active-low; enables D15–D0 drivers only when CS is low - supports shared bus operation |
| CONVST (31) | Conversion start trigger | Falling-edge sensitive; initiates SAR cycle and resets internal register - no restart during conversion |
| CS (32) | Chip select | Active-low; gates CONVST and RD functionality; selects Nap vs Sleep mode with SHDN |
| SHDN (33) | Power shutdown control | Low-active; combined with CS state determines Nap (CS low) or Sleep (CS high) mode |
| VSS (34) | Negative analog supply | –5V rail; must be bypassed with 10µF + 0.1µF tantalum/ceramic to AGND |
| AVDD (35, 36) | Positive analog supply | +5V rails; both pins require individual 10µF + 0.1µF bypassing and interconnection via 10Ω resistor |
Key Features
| Feature | Design Value |
|---|---|
| No pipeline delay | Immediate data availability after BUSY rise - eliminates latency-critical buffering in closed-loop control |
| True differential input architecture | 68dB CMRR up to 100kHz - enables accurate measurement of low-level signals in presence of ground loops |
| Internal 2.5V reference with ±15ppm/°C drift | Eliminates need for external reference IC in cost-sensitive designs while maintaining DC accuracy |
| 3V/5V digital I/O compatibility | Separate OVDD pin allows direct connection to 3V microcontrollers or FPGAs without level shifters |
| Guaranteed no missing codes over temperature | Ensures monotonicity and integrity of full-scale transitions in industrial temperature ranges |
Applications
| Telecommunications Test Equipment | Digital Signal Processing Front-End |
|---|---|
Use Scenario: Capturing wideband IF signals in base station analyzers and vector signal analyzers. IC Role / Device Role / Timing Role: High-fidelity digitization stage preceding FFT and demodulation processing. Use Value: 90dB SINAD and 5MHz full-power bandwidth preserve modulation fidelity for QAM-256 and OFDM waveforms. | Use Scenario: Real-time sensor data conditioning in motor control DSPs with adaptive filtering. IC Role / Device Role / Timing Role: Synchronized sampling engine feeding fixed-point DSP cores via parallel bus. Use Value: No pipeline delay and BUSY-strobed output ensure deterministic timing for interrupt-driven sampling routines. |
| Multiplexed Data Acquisition Systems | High-Speed Oscilloscope Channel Digitizer |
Use Scenario: Multi-channel voltage/current monitoring in PLC backplanes with shared bus architecture. IC Role / Device Role / Timing Role: Channel-specific ADC with RD-controlled three-state outputs enabling time-multiplexed readout. Use Value: Pin-compatible replacement for LTC1604 allows drop-in upgrade to higher resolution without layout change. | Use Scenario: Single-shot transient capture in portable oscilloscopes requiring >100kpts memory depth. IC Role / Device Role / Timing Role: Primary digitizer driving FIFO buffers at sustained 500ksps with precise aperture timing. Use Value: 5psRMS aperture jitter and 400ns acquisition time support sub-1LSB accuracy at full sample rate. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-speed 16-bit ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS8556IPM | 6-channel simultaneous-sampling, 16-bit, 630ksps; requires external reference and separate AVDD/DVDD supplies | Targeted at multi-channel synchronized acquisition; lacks integrated reference and shutdown modes | Select when channel-to-channel isolation and simultaneous sampling across 6 inputs are required |
| LTC2320-16CUH#PBF | 16-bit, 2Msps SAR ADC; serial LVDS interface; no parallel bus; 1.8V/3.3V supplies only | Designed for ultra-high-speed, low-power portable instrumentation; incompatible pinout and interface | Select when board space is constrained and serial interface with lower EMI is preferred over parallel bus |
Compared with ADS8556IPM and LTC2320-16CUH#PBF, the LTC1608ACG#PBF uniquely combines integrated reference, dual shutdown modes, µP-compatible parallel interface, and pin compatibility with legacy LTC1604 designs - making it optimal for retrofitting and cost-sensitive high-fidelity acquisition where bus simplicity and thermal efficiency matter.
Availability
LTC1608ACG#PBF is available at Aetrix Electronics and suitable for telecommunications test equipment, digital signal processing front-ends, and multiplexed data acquisition systems requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LTC1608ACG#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 LTC1608ACG#PBF belongs to ADI's legacy Linear Technology high-speed precision ADC product line, engineered for applications demanding high dynamic range, low distortion, and robust operation in demanding signal chain environments.
FAQ
What is the operating temperature range for the LTC1608ACG#PBF?
The LTC1608ACG#PBF is specified for the commercial temperature range of 0°C to 70°C. This grade is designated by the "C" suffix in the part number and is validated for performance including integral linearity error, offset tempco, and full-scale error across that full range. The "A" prefix indicates improved AC specifications versus the base LTC1608CG.
Does the LTC1608ACG#PBF require an external clock source?
No, the LTC1608ACG#PBF does not require an external clock. It contains a fully integrated, factory-trimmed internal clock that drives the SAR conversion process. This clock guarantees a typical conversion time of 1.45µs and a maximum of 1.8µs over temperature, eliminating timing synchronization overhead and external component count.
How does the LTC1608ACG#PBF handle power-down modes, and what are their wake-up times?
The LTC1608ACG#PBF offers two hardware-controlled power-down modes: Nap mode (7mW, CS low + SHDN low) wakes up in 200ns, retaining reference and logic bias; Sleep mode (10µW, CS high + SHDN low) requires longer wake-up due to reference re-stabilization - typically 80ms with the recommended 22µF REFCOMP capacitor. Both modes are entered and exited solely via SHDN and CS pin states.
Can the LTC1608ACG#PBF interface directly with a 3.3V microcontroller?
Yes, the LTC1608ACG#PBF supports 3.3V digital interfacing via its dedicated OVDD pin. When OVDD = 3.3V, 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 per their VIH/VIL specs. This eliminates level-shifting components in mixed-voltage systems.
What is the significance of the "A" in LTC1608ACG#PBF?
The "A" in LTC1608ACG#PBF denotes an enhanced AC performance grade. Compared to the standard LTC1608CG, the "A" version specifies tighter limits on integral linearity error (±0.5 LSB vs ±1 LSB), transition noise (0.7 LSBRMS), and full-scale error (±0.125% vs ±0.25%), making it suitable for applications where dynamic accuracy is critical - such as spectrum analysis and high-fidelity imaging.
LTC1608ACG#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:
- 0°C ~ 70°C
- Supplier Device Package:
- 36-SSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC1608ACG#PBF FAQ
1.How can I place an order for LTC1608ACG#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1608ACG#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 LTC1608ACG#PBF reliable?
The price and inventory of LTC1608ACG#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1608ACG#PBF is usually 5 days.
3.What payment methods are accepted for LTC1608ACG#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1608ACG#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1608ACG#PBF?
LTC1608ACG#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1608ACG#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 LTC1608ACG#PBF?
For technical support, including LTC1608ACG#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1608ACG#PBF requirements.
6.How does Aetrix verify that LTC1608ACG#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1608ACG#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 LTC1608ACG#PBF meets industry standards.
7.What is the process for return or replacement of LTC1608ACG#PBF?
All LTC1608ACG#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1608ACG#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 LTC1608ACG#PBF part is unused and in its original packaging.
Return procedure for LTC1608ACG#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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