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Analog Devices Inc. LTC1668CG#TRPBF
- Part No.:
- LTC1668CG#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Digital to Analog Converters (DAC)
- Package:
- 28-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
LTC1668CG#TRPBF.pdf
- Description:
- IC DAC 16BIT A-OUT 28SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,721
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Product details
Overview
LTC1668CG#TRPBF from Analog Devices (formerly Linear Technology) is a 16-bit, 50 Msps differential current-output DAC implemented in high-performance BiCMOS with laser-trimmed thin-film resistors. It delivers 87 dB SFDR at 1 MHz fOUT, 5 pV·s differential glitch impulse, 20 ns settling time, and operates from ±5 V supplies with 10 mA full-scale output current. It serves as the core digital-to-analog conversion stage in high-fidelity wireless base station transmit chains.
For engineers reviewing the LTC1668CG#TRPBF datasheet, LTC1668CG#TRPBF pinout, LTC1668CG#TRPBF application, or LTC1668CG#TRPBF equivalent, key selection criteria include guaranteed 16-bit monotonicity, ±1 LSB DNL over temperature, differential current output compliance of ±1 V, internal 2.5 V reference with 25 ppm/°C drift, and 28-pin SSOP packaging compatible with industrial-grade PCB layouts.
Technical Context
The LTC1668CG#TRPBF employs a segmented current-steering architecture: the four MSBs use 15 equal-weight current segments, while the 12 LSBs rely on binary-weighted current sources combined with a differential resistive attenuator ladder. This hybrid topology ensures precise DC linearity and low glitch energy across the full 50 Msps update rate.
Its internal 2.5 V bandgap reference drives REFOUT and controls IOUTFS via an external RSET resistor (e.g., 2 kΩ for 10 mA full-scale), with servo-loop compensation on COMP1. The DAC supports both internal and external reference configurations, and its differential outputs (IOUT A/IOUT B) are optimized for transformer coupling or high-speed op-amp I-to-V conversion with >1.1 kΩ output impedance to LADCOM.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16-bit - guarantees monotonic transfer function up to 65535 codes with no missing codes |
| Update Rate | 50 Msps - supports real-time waveform synthesis up to Nyquist frequency of 25 MHz |
| SFDR @ 1 MHz | 87 dB - enables clean spectral purity in multicarrier cellular transmission without adjacent-channel interference |
| Differential Glitch Impulse | 5 pV·s - minimizes transient energy during code transitions, critical for low-spur DDS applications |
| Full-Scale Output Current | 10 mA (adjustable 1–10 mA) - sets output voltage swing when loaded with 50 Ω or transformer primary |
| Output Compliance Range | ±1 V - defines safe linear operating window for IOUT A/IOUT B when referenced to LADCOM |
| Reference Drift | 25 ppm/°C - ensures stable full-scale accuracy across 0°C to 70°C industrial temperature range |
Pinout & Package
Package: 28-lead plastic SSOP (G package), 0.300-inch body width, JEDEC MO-153 compliant, rated for 0°C to 70°C operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| DB0–DB15 | Digital input data bus (LSB to MSB) | 16-bit parallel interface latched on CLK rising edge; compatible with 3.3 V or 5 V CMOS logic |
| CLK | Asynchronous clock input | Triggers sample-and-hold; supports 50 Msps max with ≥5 ns high/≥8 ns low pulse width |
| IOUT A / IOUT B | Differential current outputs | Complementary sourcing paths; full-scale occurs at all-1s (A) and all-0s (B); require external load or transformer |
| REFOUT / IREFIN | Internal reference output & control input | 2.5 V bandgap source (REFOUT); sets IOUTFS = 8 × (VREF / RSET) via feedback loop into IREFIN |
| COMP1 / COMP2 | Reference loop compensation nodes | COMP1 requires 0.1 µF capacitor to VSS for stability; COMP2 is internal bypass point |
| LADCOM | Attenuator ladder common node | Must be tied to same potential as IOUT A/IOUT B load return; carries ~0.32 × IOUTFS constant current |
Key Features
| Feature | Design Value |
|---|---|
| Segmented MSB + Binary LSB Architecture | Enables 16-bit monotonicity and <±1 LSB DNL by decoupling matching sensitivity between coarse and fine current sources |
| Onboard 2.5 V Bandgap Reference | Eliminates need for external reference IC; trimmed to ±0.1% initial accuracy with 25 ppm/°C drift over temperature |
| Differential Current Outputs | Provides inherent common-mode noise rejection and doubles signal power vs. single-ended mode, improving SFDR by 3–6 dB |
| Low-Glitch Switching Design | 5 pV·s differential glitch impulse ensures minimal transient distortion during fast code transitions at 50 Msps |
| ±1 V Output Compliance | Allows direct connection to 50 Ω loads or transformer primaries without external biasing, simplifying RF interface design |
Applications
| Cellular Base Station Transmitters | Direct Digital Synthesis (DDS) |
|---|---|
Use Scenario: Generating multi-carrier LTE or 5G NR uplink waveforms in remote radio units with stringent ACLR requirements. IC Role / Device Role / Timing Role: Primary high-speed DAC in the digital front-end, converting baseband I/Q samples to analog RF intermediate frequency signals. Use Value: 87 dB SFDR at 1 MHz enables >40 dB ACLR margin before digital predistortion, reducing PA linearity demands. | Use Scenario: Producing agile, phase-continuous sine/cosine waveforms for radar chirp generation and test signal synthesis. IC Role / Device Role / Timing Role: Core waveform engine in programmable signal generators, synchronized to ultra-low-jitter clock sources. Use Value: 20 ns settling time and 5 pV·s glitch support sub-ns timing resolution and <−90 dBc spurious content in swept-tone outputs. |
| Automated Test Equipment (ATE) | Arbitrary Waveform Generation |
Use Scenario: Stimulus generation for high-speed ADC characterization and mixed-signal SoC validation. IC Role / Device Role / Timing Role: Precision stimulus source driving device-under-test inputs with calibrated amplitude, offset, and timing. Use Value: ±1 LSB DNL and ±8 LSB INL ensure accurate representation of ideal transfer functions for error mapping. | Use Scenario: Reproducing complex biomedical, audio, or sensor emulation waveforms in lab instrumentation. IC Role / Device Role / Timing Role: High-fidelity analog output stage translating stored digital waveforms into continuous-time signals. Use Value: 16-bit resolution and ±1 V compliance enable >96 dB dynamic range and direct drive of 50 Ω coaxial interfaces. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-speed DAC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD9779ABSVZ | 16-bit, 1.2 Gsps, but uses 1.8 V/3.3 V supplies and LVDS interface; higher power (1.4 W), larger 144-lead BGA package | Targets wideband IF synthesis (>200 MHz) rather than baseband/multi-MHz DAC applications | Select when >100 MHz output bandwidth or JESD204B interface is required; not drop-in compatible |
| MAX5895EGK+ | 16-bit, 500 Msps, 3.3 V supply, integrated PLL, but only ±0.5 LSB DNL typical and no internal reference | Optimized for cable modem DOCSIS 3.1 upstream channel bonding with built-in interpolation filters | Choose for high-sample-rate systems needing on-chip clock multiplication; requires external reference and layout redesign |
Compared with AD9779ABSVZ and MAX5895EGK+, the LTC1668CG#TRPBF offers superior SFDR at mid-band frequencies (87 dB @ 1 MHz), integrated 2.5 V reference, and industrial-temperature-rated SSOP packaging-making it optimal for cost-sensitive, thermally constrained, and spectrally demanding baseband DAC applications where 50 Msps suffices.
Availability
LTC1668CG#TRPBF is available at Aetrix Electronics and suitable for cellular infrastructure, automated test equipment, direct digital synthesis, and arbitrary waveform generation requiring stable component supply across extended production cycles.
Supply support for LTC1668CG#TRPBF 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 precision instrumentation, communications, and industrial markets.
The LTC1668CG#TRPBF belongs to ADI's legacy Linear Technology high-speed DAC product line, engineered specifically for applications demanding exceptional AC performance, low glitch energy, and guaranteed monotonicity in baseband and IF signal synthesis.
FAQ
What is the guaranteed monotonicity specification for the LTC1668CG#TRPBF?
The LTC1668CG#TRPBF guarantees monotonic operation across its full 16-bit range - meaning no missing codes occur during upward or downward code transitions. This is confirmed by the datasheet's "Monotonicity" parameter of 14 bits (minimum) over temperature, with typical behavior extending to full 16-bit monotonicity under standard operating conditions (±5 V, 0°C to 70°C).
Can the LTC1668CG#TRPBF operate with a 3.3 V digital interface while using ±5 V analog supplies?
Yes, the LTC1668CG#TRPBF supports TTL/CMOS digital inputs at either 3.3 V or 5 V logic levels. Its VIH (min) is 2.4 V and VIL (max) is 0.8 V, ensuring reliable recognition of 3.3 V logic thresholds across temperature. The analog section remains powered by independent ±5 V supplies, enabling full dynamic range without digital supply coupling.
What is the purpose of the LADCOM pin on the LTC1668CG#TRPBF, and how must it be connected?
The LADCOM pin is the common node for the internal attenuator ladder and must be connected to the same potential as the return path of the IOUT A and IOUT B load resistors - typically AGND or the center tap of a transformer. It sinks ~0.32 × IOUTFS and maintains proper bias for the LSB current sources; incorrect routing causes gain error and INL degradation.
Does the LTC1668CG#TRPBF require external capacitors on REFOUT and COMP1, and why?
Yes - a 0.1 µF capacitor is mandatory between REFOUT and AGND for reference stability, and another 0.1 µF capacitor must connect COMP1 to VSS for loop compensation. These are not optional: omitting them causes reference oscillation, IOUTFS drift, and degraded SFDR due to uncontrolled reference loop dynamics.
How does full-scale output current adjustment affect the AC performance of the LTC1668CG#TRPBF?
Reducing IOUTFS below 10 mA degrades AC performance significantly: at 1 mA, SFDR drops ~10–15 dB compared to 10 mA operation. This occurs because noise currents scale inversely with output current, making relative spurious content worse. For best SFDR, maintain IOUTFS = 10 mA and adjust signal amplitude digitally or via external gain stages instead.
LTC1668CG#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 28-SSOP (0.209", 5.30mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Number of Bits:
- 16
- Number of D/A Converters:
- 1
- Settling Time:
- 20ns (Typ)
- Output Type:
- Current - Unbuffered
- Differential Output:
- Yes
- Data Interface:
- Parallel
- Reference Type:
- External, Internal
- Voltage - Supply, Analog:
- ±5V
- Voltage - Supply, Digital:
- -
- INL/DNL (LSB):
- ±8 (Max), ±1
- Architecture:
- Current Steering
- Operating Temperature:
- 0°C ~ 70°C
- Supplier Device Package:
- 28-SSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC1668CG#TRPBF FAQ
1.How can I place an order for LTC1668CG#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1668CG#TRPBF 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 LTC1668CG#TRPBF reliable?
The price and inventory of LTC1668CG#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1668CG#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1668CG#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1668CG#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1668CG#TRPBF?
LTC1668CG#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1668CG#TRPBF 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 LTC1668CG#TRPBF?
For technical support, including LTC1668CG#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1668CG#TRPBF requirements.
6.How does Aetrix verify that LTC1668CG#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1668CG#TRPBF 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 LTC1668CG#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1668CG#TRPBF?
All LTC1668CG#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1668CG#TRPBF, 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 LTC1668CG#TRPBF part is unused and in its original packaging.
Return procedure for LTC1668CG#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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