Building on its digital CMOS processes, TI creates analog
CMOS processes that provide excellent analog performance characteristics
and integration, while still maintaining fast logic and dense
memories that match all but the latest digital processes.
A newly developed analog CMOS process adds functions such
as passives, low-transition voltage (low VT) CMOS,
and drain-extended MOS for handling voltages in the 20-30
V range. Some analog components further enhance the precision
of the process; then this process serves as the basis for
adding specialized capabilities such as RF, speed and power.
HPA07
One of TI’s core analog technologies is the HPA07 Precision
Analog CMOS process, which offers extremely low-noise performance
for communications and other systems where analog and high-speed
digital functions must co-exist with minimal signal interference.
Incorporating the logic and memory of its fundamental 5 V,
0.3-micron digital CMOS process, the HPA07 process then adds
specialized transistors and passive components for analog
functionality. Isolation shields analog signals from the high-frequency
interference of digital circuits, and exceptional component
matching promotes precision.
Key components include low-noise transistors with extremely
low total harmonic distortion (THD) characteristics. The transistors
are created using a buried-channel PMOS technique, which allows
tighter noise characteristics control to give the best gain
bandwidth/noise ratio for this class of device. Silicon-chromium
(SiCr) thin film resistors with very low temperature coefficients
provide stability over the entire working temperature range.
Metal-insulator-metal (MIM) capacitors with tight alignment
and low parasitics reduce size while providing a 4X improvement
in voltage coefficients over previous processes. Drain-extended
CMOS transistors that handle up to 30 V for driving signals
enable the process to extend to higher voltage applications.
TI’s OPA333
is an example of a key product based on TI’s high precision
process. This OPA333 is a zero-drift amplifier that achieves
precision performance at 1/10th the power of its nearest competitor.
It features ultra-low offset, ultra-low quiescent current,
miniature packages and operation down to 1.8V, and targets
applications in medical instrumentation, temperature measurement,
test equipment, security and consumer systems.
The HPA07 process is also leveraged as part of TI’s
DAC8832,
a single, 16-bit, serial-input, voltage-output digital-to-analog
converter that operates from a single 3 V to 5 V power supply.
The DAC8832 delivers excellent linearity, low glitch, low
noise and fast settling. Because it offers unbuffered output,
the DAC8832 delivers reduced power consumption and the error
introduced by the buffer.
TI’s ADS8509
is a complete 16-bit sampling analog-to-digital converter
using state-of-the-art CMOS structures available through TI’s
HPA07 process. The ADS8509 contains a 16-bit, capacitor-based,
successive approximation register (SAR) A/D converter with
sample-and-hold, reference, clock and a serial data interface.
Data can be output using internal clock or can be synchronized
to an external data clock; and the device provides output
synchronization pulse for ease of use with standard DSP processors.
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