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PDF MAX12000 Data sheet ( Hoja de datos )
| Número de pieza | MAX12000 | |
| Descripción | 1575MHz GPS Front-End Amplifier | |
| Fabricantes | Maxim Integrated Products | |
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19-4021; Rev 0; 3/06
EVAALVUAAILTAIOBNLEKIT
1575MHz GPS Front-End Amplifierwww.DataSheet4U.com
General Description
The MAX12000 GPS front-end amplifier IC is designed
for automotive and marine GPS satellite navigation
antenna modules or for any application that needs to
compensate for cable losses from the GPS antenna to
receiver. Two unconditionally stable low-noise amplifier
stages provide the high gain and integrated I/O match-
ing to minimize the need for external matching compo-
nents and eliminate the need for additional gain stages.
The MAX12000 features the option to place a bandpass
ceramic or SAW filter between the two amplifier stages
to provide a narrow-band output to further improve the
noise performance of the GPS receiver. Additionally, a
3.4dB gain step is provided to compensate for cable
loss variation between different applications.
The MAX12000 is designed to operate at the GPS fre-
quency of 1575MHz with a 34.8dB typical cascaded
gain and a 25mA supply current. The two LNA stages
allow the use of a wide range of GPS filter types for
maximum flexibility in system design. The final RF out-
put pin, which drives the cable to the GPS receiver, is
also the power-supply connection that accepts a DC
supply in the +3.0V to +5.5V range. Alternatively, the
DC supply can be applied to pin 4.
The GPS front-end amplifier is designed on a low-noise,
advanced SiGe process and is available in a lead-free,
10-pin TDFN surface-mount package (3mm x 3mm).
Applications
Integrated Automotive and Marine GPS
Receivers
Features
♦ First Amp Noise Figure*: 1.0dB
♦ High Gain**: 34.8dB
♦ 3.4dB Gain Step
♦ Integrated 50Ω Output Matching
♦ 3.0V to 5.5V Supply Voltage Range
♦ Small, Low-Cost Package (3mm x 3mm)
♦ ESD Protected to ±1kV Human Body Model
*Without external input impedance match.
**First amplifier input is impedance matched (S11 = -10dB).
Second amplifier set to high gain. Amplifiers cascaded without
interstage filter.
Ordering Information
PART
TEMP RANGE
MAX12000ETB+ -40°C to +85°C
+Denotes lead-free package.
PIN-
PACKAGE
10 TDFN
PKG
CODE
T1033-2
Typical Operating Circuit appears at end of data sheet.
Pin Configuration/Functional Diagram
TOP VIEW
+
RFIN2 1
GND 2
GND 3
EXTCAP/ALT_VCC 4
RFOUT2/VCC 5
MAX12000
AMP 2
AMP 1
DC
GENERATION
10 RFOUT1
9 GND
8 GND
7 GAIN_SELECT
6 RFIN1
TDFN
________________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
1 page  
1575MHz GPS Front-End Amplifierwww.DataSheet4U.com
Typical Operating Characteristics (continued)
(PIN = -40dBm, fIN = 1575MHz, inputs and outputs are terminated to 50Ω, VCC = +5.0V, TA = +25°C, unless otherwise noted.)
AMP 1 S12
-32
AMP 2 S12
-20
-24
-34
-28
-36
-32
-38
-36
-40
800
1000 1200 1400 1600 1800 2000
FREQUENCY (MHz)
-40
800
1000 1200 1400 1600 1800 2000
FREQUENCY (MHz)
Pin Description
PIN
1
2, 3, 8, 9
4
5
6
7
10
EP
NAME
FUNCTION
RFIN2
Amplifier 2 Input. Incorporates an internal DC-blocking capacitor and is internally matched to 50Ω.
This input is designed to be connected to a bandpass filter.
GND
Electrical Ground
EXTCAP/
ALT_VCC
External Smoothing Capacitor for Internal Supply Voltage or Can Be Used as the External DC Supply
Pin to Eliminate the Need for a Bias-T on Pin 5
RFOUT2/VCC
Amplifier 2 Output. Incorporates an internal DC-blocking capacitor and is internally matched to 50Ω.
DC bias on this pin serves as the power supply through a bias-T.
RFIN1
Amplifier 1 Input. Requires external DC-blocking capacitor and matching components.
GAIN_SELECT AMP 2 Gain Select. Open is high-gain mode. Short to ground is low-gain mode.
RFOUT1
Amplifier 1 Output. Incorporates an internal DC-blocking capacitor and is internally matched to 50Ω.
This output is designed to drive a bandpass filter.
Exposed Pad
Ground. The exposed pad must be soldered to the circuit board for proper thermal and electrical
performance.
_______________________________________________________________________________________ 5
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| Páginas | Total 9 Páginas | |
| PDF Descargar | [ Datasheet MAX12000.PDF ] | |
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