The AD15700 is a precision component to interface analog input
and output channels to a digital processor. It is ideal for arealimited
applications that require maximum circuit density. The
AD15700 contains the functionality of a 16-bit, 1 MSPS charge
redistribution SAR analog-to-digital converter that operates from
a 5 V power supply. The high speed 16-bit sampling ADC incorporates
a resistor input scaler that allows various input ranges, an
internal conversion clock, error correction circuits, and both serial
and parallel system interface ports. The AD15700 also contains a
14-bit, serial input, voltage output DAC that operates from a 5 V
supply and has a settling time of 1 ms. Two single- or split-supply
voltage feedback amplifiers with rail-to-rail input and output
characteristics featuring 80 MHz of small signal bandwidth and
10 mV/∞C offset drift provide ADC and DAC buffering capability.
The center tapped 3 kW resistors are precision resistor networks
with 2 ppm/∞C ratio tracking that provide low gain drift when
used for scaling.
The ADC, DAC, and amp functions are electrically isolated from
each other to provide maximum design flexibility. Input and
output signal conditioning circuits for the converters can be easily
configured with short interconnects under the device at the board
level. The AD15700 is available in a 10 mm CSPBGA package.