AUTOMOTIVE ANTENNA AMPLIFIERS--MT1119 AUTOMOTIVE AM/FM ANTENNA AMPLIFIER SUBSYSTEM

The MT1119 is an advanced, lowpower,
highly integrated single-chip
amplifier IC specifically designed for
automotive AM/FM antenna systems
requiring low noise and very low
distortion. Additionally, the MT1119
has an integrated true-RMS power
detector and an uncommitted
op-amp in order to realize an AGC
function for FM by simply adding
external PIN diodes. The threshold
of the FM AGC function is variable
and can be set according to the
application requirements. The onchip
2.55V temperature
compensated reference generator
and high output voltage op-amp
combine to form a low-cost, reliable,
automotive-capable power supply
which can be directly derived from
the car battery.
The MT1119 is capable of
amplifying signals with frequencies
in the 0.15 MHz to 30 MHz range for
AM and 76 MHz to 165 MHz range
for FM. External components
determine the gain of the AM and
FM amplifiers and can also be
modified to extend the operating
frequency of the MT1119.
The AM amplifier uses a highly
sophisticated design technology in
order to reach low noise, very low
distortion, high input impedance and
its capability to drive very low output
impedance. The FM amplifier is
matched to 50 ohms and is specially
designed to perform with very low
noise and distortion.
The small 24-pin QFN
package of the MT1119 and the
requirement for minimal external
components enables a compact,
cost-effective solution fulfilling
automotive requirements.
APPLICATIONS
In-glass antennas
Active roof antennas
Other active AM/FM antenna
systems
FEATURES
AM input frequency range
0.15 MHz to 30 MHz supports
AM, DRM and HD Radio
standards in the longwave,
midwave and shortwave band
FM input frequency range 76
MHz to 165 MHz supports FM
and HD Radio standards in
the FM and weather band
Fully integrated amplifiers for
AM and FM
Fully integrated RMS level
detector and general purpose
op-amp (PIN-diode drivers)
for easy implementation of
AGC function for FM
On-chip reference voltage
generator and high output
voltage op-amp builds a
reliable low-cost voltage
regulator function
Low noise
Low power consumption
Ultra low distortion
Very high AM input
impedance
Very small package
Highly sophisticated
temperature compensation
design technology to support
the extended automotive
ambient temperature range
from -40