DESCRIPTION
The LTC®1657/LTC1657L are complete single supply, rail-to-rail voltage output, 16-bit digital-to-analog converters (DAC) in a 28-pin SSOP or PDIP package. They include a rail-to-rail output buffer amplifier, an internal reference and a double buffered parallel digital interface.
The LTC1657/LTC1657L have separate reference input pins that can be driven by an external reference. The full scale output can be 1 or 2 times the reference voltage depending on how the X1/X2 pin is connected. The LTC1657 operates from a 4.5V to 5.5V supply and has an onboard 2.048V reference. The LTC1657L operates from a 2.7V to 5.5V supply and has an onboard 1.25V reference.
The LTC1657/LTC1657L are similar to Linear Technology Corporation’s LTC1450/LTC1450L 12-bit VOUT DAC family, allowing an upgrade path. They are the only buffered 16-bit parallel DACs in a 28-lead SSOP package and include an onboard reference for stand alone performance.

FEATURES
■ 16-Bit Monotonic Over Temperature
■ Deglitched Rail-to-Rail Voltage Output: 8nV•s
■ ICC: 650µA Typ
■ Maximum DNL Error: ±1LSB
■ Settling Time: 20µs to ±1LSB
■ Built-In Reference:
   2.048V (LTC1657)
   1.25V (LTC1657L)
■ Internal Power-On Reset to Zero Volts
■ Asynchronous CLR Pin
■ Output Buffer Configurable for Gain of 1 or 2
■ Parallel 16-Bit or 2-Byte Double Buffered Interface
■ Narrow 28-Lead SSOP Package
■ Multiplying Capability

APPLICATIONS
■ Instrumentation
■ Digital Calibration
■ Industrial Process Control
■ Automatic Test Equipment
■ Communication Test Equipment