DocumentationDatasheet
Design Note
- DN259 - A-to-D Converter Does Frequency Translation
- DN306 - High Performance Op Amps Deliver Precision Waveform Synthesis
Reliability Data
Product Selector Card
LT Journal
- Aug 2002 High Performance Op Amps Deliver Precision Waveform Synthesis
- Sep 2001 LTC1668 DAC and LT1807 Op Amp Achieve 90ns Settling to 16 Bits and 83dB SFDR in a Small Footprint
- Sep 2001 New 16-Bit 50Msps DAC Offers Highest AC and DC Performance
Press Release
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Features
- 50Msps Update Rate
- Pin Compatible 12-Bit, 14-Bit and 16-Bit Devices
- High Spectral Purity: 87dB SFDR at 1MHz fOUT
- 5pV-s Glitch Impulse
- Differential Current Outputs
- 20ns Settling Time
- Low Power: 180mW from ±5V Supplies
- TTL/CMOS (3.3V or 5V) Inputs
- Small Package: 28-Pin SSOP
Typical Application
Description
The LTC1666/LTC1667/LTC1668 are 12-/14-/16-bit, 50Msps differential current output DACs implemented on a high performance BiCMOS process with laser trimmed, thin-film resistors. The combination of a novel current-steering architecture and a high performance process produces DACs with exceptional AC and DC performance. The LTC1668 is the first 16-bit DAC in the marketplace to exhibit an SFDR (spurious free dynamic range) of 87dB for an output signal frequency of 1MHz.Operating from ±5V supplies, the LTC1666/LTC1667/LTC1668 can be configured to provide full-scale output currents up to 10mA. The differential current outputs of the DACs allow single-ended or true differential operation. The –1V to 1V output compliance of the LTC1666/LTC1667/LTC1668 allows the outputs to be connected directly to external resistors to produce a differential output voltage without degrading the converter’s linearity. Alternatively, the outputs can be connected to the summing junction of a high speed operational amplifier, or to a transformer.
The LTC1666/LTC1667/LTC1668 are pin compatible and are available in a 28-pin SSOP and are fully specified over the industrial temperature range.
SSOP-28
Package Variations and Pricing
| Part Number | Package | Pins | Temp | Price (1-99) |
Price (1k)* |
|---|---|---|---|---|---|
| LTC1668CG#PBF | SSOP | 28 | C | $16.05 | $13.75 |
| LTC1668CG#TRPBF | SSOP | 28 | C | $13.85 | |
| LTC1668IG#PBF | SSOP | 28 | I | $17.40 | $14.95 |
| LTC1668IG#TRPBF | SSOP | 28 | I | $15.05 | |
| LTC1668IG#TR | SSOP | 28 | I | $30.10 | |
| LTC1668IG | SSOP | 28 | I | $34.80 | $29.90 |
| LTC1668CG#TR | SSOP | 28 | C | $27.70 | |
| LTC1668CG | SSOP | 28 | C | $32.10 | $27.50 |
Linear Technology offers many demo boards free of charge to qualified customers. Contact your local sales office or distributor to inquire about a demo board. Certain demo boards are also available for sale via credit card on this website. Demo boards are for evaluation purposes only. It remains the customer’s responsibility to verify proper and reliable operation in the actual end application.
| Part Number | Description | Price | Documentation |
|---|---|---|---|
| DC2459A-A | LTC1668 with LT1812 Demo Board | 16-Bit, 50Msps DAC, Single-Ended ±1V outputs | $125.00 | |
| DC2459A-B | LTC1668 with LT6600 Demo Board | 16-Bit, 50Msps DAC, Differential ±0.25V outputs | $125.00 | |
| DC2459A-C | LTC1668 with LT1468 Demo Board | 16-Bit, 50Msps DAC, Single-Ended ±10V outputs | $125.00 | |
| DC245A-A | LTC1668CG | 16-Bit, High Speed Differential Current Output DAC | $75.00 |
Companion Boards
| Part Number | Description | Price | Documentation |
|---|---|---|---|
| DC2026C | Linduino One Isolated USB Demo Board: An Arduino- and QuikEval-Compatible Code Development Platform | $75.00 |