High Temperature Dual Precision Operational Amplifier
HTOP01
DESCRIPTION
The HTOP01 is a precision low power op amp, offering
very low input offset voltage and drift over an operating
temperature range of -55 C to 225 C. Using auto-
zeroing techniques input offset voltage is continuously
sampled and compensated, providing near perfect offset
voltage compensation over temperature and time.
An internal oscillator and logic provides all necessary
auto-zero clock signals, and no external capacitors are
needed.
The internal auto-zero clock generator produces a
pseudo-random clock frequency operating between
2kHz – 4kHz that effectively “spreads out” the clock
noise frequency spectrum over a 2kHz span. This
greatly reduces detectable clock noise in the amplifier’s
output spectrum.
Additionally, an external clock input pin (XCLK) is
provided along with a select input pin (SEL) to choose
between the internal clock and an optional external
clock.
The external clock option allows timing flexibility for
synchronously sampled systems, where no clock energy
can be tolerated in the sampled amplifier output.
To save power, a power shutdown pin (SHDN) de-
powers all analog circuitry when asserted (active high).
The current with SHDN asserted is <150 A over
temperature.
APPLICATIONS
Downhole Drilling Measurement and Production Tools
Strain Gauge Transducers
RTD Temperature Sensing
High Temperature Instrumentation
High Resolution Data Acquisition
Low Power Measurement
FEATURES
-55 C to 225 C Ambient Temperature Range
Gain-Bandwidth Product: 2.0MHz Typical
Continuous Input Offset Voltage Auto-Zeroing
With Internal Clock
Single 5V Supply Operation
Input Offset Voltage 100 V Max Over
Temperature
5.0mA maximum Supply Current
Input Offset Drift 0.2 V/ C Max
Power shutdown pin provided
High Gain, CMRR: 100dB Min
External clocking option for synchronous systems
Available in 14 lead DIP package
