Rainbow-electronics MAX2670 Manual do Utilizador descarregar pdf (Página 3)

�� Maxim Integrated Products 3

MAX2670

GPS/GNSS Front-End Amplifier

Note 1: T

+25NC and T

= +105NC are guaranteed by production test. At T

-40NC, the minimum and maximum values are

guaranteed by design and characterization, unless otherwise noted.

Note 2: Measured using the MAX2670 evaluation board with a DC-blocking capacitor at the input of LNA 1.

Note 3: At T

= +25NC, the maximum value is guaranteed by design and characterization. Specification is corrected for board

losses on the MAX2670 EV kit.

AC ELECTRICAL CHARACTERISTICS (continued)

= 3.0V to 5.5V, P

= -40dBm, f

= 1575MHz, T

= -40NC to +105NC. Typical values are at 5.0V and at T

= +25NC. Input

matched to 50I, load = 50I, pin 7 open, unless otherwise noted.) (Note 1)

Typical Operating Characteristics

= -40dBm, f

= 1575MHz, inputs and outputs are terminated to 50I, V

= 5.0V, T

= +25NC, unless otherwise noted.)

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

AMP 2 Output Third-Order

Intercept Point

OIP3

Two tones at 1574.5MHz and 1575.5MHz,

-30dBm per tone

16.0 dBm

AMP 2 Output 1dB Compression

Point

5.3 dBm

AMP 2 Input Return Loss

-21 dB

AMP 2 Output Return Loss

-8.8 dB

AMP 2 Reverse Isolation

-25 dB

0.6

0.8

0.7

1.0

0.9

1.1

1.2

1.3

1.4

-40 0 20-20 40 60 80 100

AMP 1 NOISE FIGURE vs. TEMPERATURE

(WITHOUT EXTERNAL INPUT IMPEDANCE MATCH)

MAX2670 toc01

TEMPERATURE (°C)

NOISE FIGURE (dB)

1.0

2.0

1.5

3.0

2.5

3.5

4.0

4.5

5.5

5.0

-40 0 20-20 40 60 80 100

AMP 2 NOISE FIGURE vs. TEMPERATURE

MAX2670 toc02

TEMPERATURE (°C)

NOISE FIGURE (dB)

LOW-GAIN MODE

HIGH-GAIN MODE

22.5

21.5

24.5

23.5

26.5

25.5

27.5

3.0 4.03.5 4.5 5.0 5.5

SUPPLY VOLTAGE vs. CURRENT

(PIN 7 OPEN)

MAX2670 toc03

SUPPLY VOLTAGE (V)

SUPPLY CURRENT (mA)

= +105°C

= +85°C

= +25°C

= -40°C

1 2 3 4 5 6 7 8 9

GPS/GNSS Front-End Amplifier 1

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