Digitally Programmable Delay Generator

The AD9500 is a digitally programmable delay generator, which

provides programmed delays, selected through an 8-bit digital

code, in resolutions as small as 10 ps. The AD9500 is constructed

in a high performance bipolar process, designed to provide

high speed operation for both digital and analog circuits.

The AD9500 employs differential TRIGGER and RESET inputs

which are designed primarily for ECL signal levels but

function with analog and TTL input levels. An onboard ECL

reference midpoint allows both of the inputs to be driven by either

single ended or differential ECL circuits. The AD9500 output

is a complementary ECL stage, which also provides a QR

parallel output circuit to facilitate reset timing implementations.

The digital control data is passed to the AD9500 through a

transparent latch controlled by the LATCH ENABLE signal. In

the transparent mode, the internal DAC of the AD9500 will attempt

to follow changes at the inputs. The LATCH ENABLE is

otherwise used to strobe the digital data into the AD9500

latches.

The AD9500 is available as an industrial temperature range device,

-25°C to +85°C, and as an extended temperature range

device, -55°C to +125°C. Both grades are packaged in a 24-pin

ceramic "Skinny" DIP (0.3" package width), as well as 28-pin

surface mount packages. The AD9500 is available in versions

compliant with MIL-STD-883. Refer to the Analog Devices

Military Products Databook or current AD9500/883B data

sheet for detailed specifications.