Figure 2 - Typical Output Response to Step Input
Out-
500 mV/ Division
Inp ut
Out+
Out+ — Out-
1.0 ns/Division
GENERAL DESCRIPTION
The SPT9110 is a low cost 100 MSPS track-and-hold ampli-
fier with single ended (75 mW) or differential output (120 mW).
It consists of three components. The first is a single-ended
track-and-hold amplifier (THA) with a 1.5 to 3.5 V input range
and PECL clock inputs. The second is an inverting op amp
with gain of -1 to provide the differential output (OUT-). The
third component is a 2.5 V bandgap reference for the inverter.
PARTITIONED POWER SUPPLY MANAGEMENT
Three separate +5 V supply connections power the THA,
inverting the op amp and bandgap reference. Unused com-
ponents can be powered off to minimize power dissipation.
The single-ended mode requires use of only the THA and
output on the OUT+ pin. In this mode the reference and
inverter may be powered down.
The differential mode requires use of all three components
(unless an external reference is supplied). The output is
measured between OUT+ and OUT- in this mode.
SPT9110
6
11/12/98
CADEKA [ CADEKA MICROCIRCUITS LLC. ]
