ADI AD7829BRUZ-1REEL7

The AD7829-1 is a high speed 8-channel, microprocessor-compatible, 8-bit analog-to-digital converter with a maximum throughput of 2 MSPS. The AD7829-1 contains an on-chip reference of 2.5 V (2% tolerance); a track-and-hold amplifier; a 420 ns, 8-bit half-flash ADC; and a high speed parallel interface. The converter can operate from a single 3 V±10% and 5 V±10% supply.

The AD7829-1 combines the convert start and power-down functions at one pin, that is, the CONVST pin. This allows a unique automatic power-down at the end of a conversion to be implemented. The logic level on the CONVST pin is sampled after the end of a conversion when an EOC (end of conversion) signal goes high, and if it is logic low at that point, the ADC is powered down. The parallel interface is designed to allow easy interfacing to microprocessors and DSPs. Using only address decoding logic, the parts are easily mapped into the microprocessor address space.

The EOC pulse allows the ADCs to be used in a stand-alone manner.

The AD7829-1 is available in a 28-lead, wide body, small outline IC (SOIC_W) and a 28-lead thin shrink small outline package (TSSOP).

• 8-bit half-flash ADC with 420 ns conversion time
• Eight single-ended analog input channels Available with input offset adjust
• On-chip track-and-hold
• SNR performance given for input frequencies up to 10 MHz
• On-chip reference (2.5 V)
• Automatic power-down at the end of conversion
• Wide operating supply range 3 V±10% and 5 V±10%
• Input ranges 0 V to 2 V p-p, VDD = 3 V±10%; 0 V to 2.5 V p-p, VDD = 5 V±10%
• Flexible parallel interface with Eoc pulse to allow stand-alone operation

• Data acquisition systems, DSP front ends
• Disk drives
• Mobile communication systems, subsampling applications