Analog Devices LTC1099 Product Info

• 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
• T_C Input Allows User Adjustable Conversion Time
• 0.3" Wide 20-Pin PDIP

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 5V_P-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