LINEAR TECHNOLOGY LTC1668 Data Sheet

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Final Electrical Specifications

LTC1668

16-Bit, 50Msps DAC

February 2000

FEATURES DESCRIPTIO

50Msps Update Rate The LTC®1668 is a 16-bit, 50Msps differential current 16-Bit Resolution output DAC implemented on a high performance Bi CMOS High Spectral Purity: 87d B SFDR at 1MHz f OUT process with laser trimmed, thin-film resistors. The com- Differential Current Outputs bination of a novel current-steering architecture and a 30ns Settling Time high performance process produces a DAC with excep- 5p V-s Glitch Impulse tional AC and DC performance. This is the first 16-bit DAC Low Power: 180m W from ±5V Supplies in the marketplace to exhibit an SFDR (spurious free TTL/CMOS (3.3V or 5V) Inputs dynamic range) of 87d B for an output signal frequency of Small Package: 28-Pin SSOP 1MHz. Operating from ±5V supplies, the LTC1668 can be con- APPLICATIO S figured to provide full-scale output currents up to 10m A. The differential current outputs of the DAC allow single-

Cellular Base Stations

ended or true differential operation. The –1V to 1V output

Multicarrier Base Stations

compliance of the LTC1668 allows the outputs to be con-

Wireless Communication

nected directly to external resistors to produce a differ-

Direct Digital Synthesis (DDS)

ential output voltage without degrading the converter’s

x DSL Modems

linearity. Alternatively, the outputs can be connected to the

Arbitrary Waveform Generation

summing junction of a high speed operational amplifier,

Automated Test Equipment

or to a transformer.

SI GN AL PL IT UD (d Bm

Instrumentation

The LTC1668 is available in a 28-pin SSOP and is fully specified over the industrial temperature range. , LTC and LT are registered trademarks of Linear Technology Corporation.

TYPICAL APPLICATIO

16-Bit, 50Msps DAC 5V

Single Tone SFDR –5

VDD LTC1668 f CLOCK = 25Msps

REFOUT 2.5V

–15 f OUT = 1.007MHz

REFERENCE

0.1µF AMPLITUDE = 0d BFS

2k IREFIN –25

= –8.5d Bm –35 SFDR = 86d Bc

IOUT A

16-BIT

1VP-P –55

HIGH SPEED 52.3Ω VOUT

DIFFERENTIAL

DAC IOUT B

COMP1

LADCOM –85

COMP2

C2 VSS AGND DGND CLK DB15 DB0

0.1µF 1668 TA01

CLOCK 16-BIT DATA FREQUENCY (1.25MHz/DIV)

INPUT INPUT 1668 G01

Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen- tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.