High Speed 8-Bit A/D Converter with Built-In Sample-and-Hold

The LTC1099 is a high speed microprocessor compatible 8-bit analog-to-digital converter (A/D). An internal sample-and-hold (S/H) allows the A/D to convert inputs up to the full Nyquist limit. With a conversion rate of 2.5µs, this allows 156kHz 5VP-P input signals or slew rates as high as 2.5V/µs, to be digitized without the need for an external S/H.

Two modes of operation, READ (RD) mode and WRITE-READ (WR-RD) mode, allows easy interface with processors. All timing is internal and edge sensitive which eliminates the need for external pulse shaping circuits. The Stand-Alone (S/A) mode is convenient for those applications not involving a processor.

Data outputs are latched with three-state control to allow easy interface to a processor data bus or I/O port. An overflow output (OFL) is provided to allow cascading for higher resolution.

Applications

* Resolution: 8 Bits

* Conversion Time:

* 2.5µs (RD Mode)

* 2.5µs (WR-RD Mode)

* Slew Rate Limit (Internal S/H): 2.5V/µs

* Low Power: 75mW Max

* Total Unadjusted Error

* LTC1099: ±1LSB

* LTC1099A: ±1/2LSB

* Built-In Sample-and-Hold

* No Missing Codes

* No User Trims Required

* All Timing Inputs Edge Sensitive for Easy Processor Interface

* Fast Conversion Time: 2.5µs

* Latched Three-State Outputs

* Single 5V Operation

* No External Clock

* Overflow Output Allows Cascading

* TC Input Allows User Adjustable Conversion Time* 0.3" Wide 20-Pin PDIP