SA600 Datasheet, PDF (11/17 Pages) NXP Semiconductors – 1GHz LNA and mixer

Philips Semiconductors
1GHz LNA and mixer
Product specification
NE/SA600
OVERALL PERFORMANCE: ISOLATION CHARACTERISTICS
4.5 ≤ V_CC = V_CCMX ≤ 5.5V, Test Fig. 1, unless otherwise specified
Isolation From LNA Output to Mixer
RF Input vs Frequency
0
0
Isolation From LO vs Frequency
–10
–10
–20
–20
At LNA input – ENABLE = LO
–30
–30
ENABLE=LO
At Mixer RF input
–40
–40
ENABLE=HI
At LNA input – ENABLE = HI
–50
–50
–60
800
900
1000
1100
FREQUENCY (MHz)
1200
–60
800
900
1000
1100
FREQUENCY (MHz)
Figure 10. Overall Performance: Isolation Characteristics
1200
SR00091
SPECIFICATIONS
The goal of the Specifications section of the datasheet is to provide
information on the NE/SA600 in such a way that the designer can
estimate statistical variations, and can reproduce the
measurements. To this end the high frequency measurements are
specified with a particular PC board layout. Variations in board
layout will cause parameter variations (sensitive parameters are
discussed in the sections on the LNA and mixer below). For many
RF parameters the ±3 sigma limits are specified. Statistically only
0.26% of the units will be outside these limits.
The LNA + mixer conversion gain is measured with an incident
900MHz signal and a 83MHZ SAW filter at the IF output. This
measurement along with a gain measurement of the LNA ensure the
correct operation of the chip and also allows a calculation of mixer
conversion gain.
LO_IN
Mixer LO port, AC coupling required, DC=3.35V, frequency range
from 100MHz to 2.5GHz, impedance close to 50Ω resistive.
IF_OUT
Mixer IF port, open-collector output with 1.6mA DC, frequency range
DC to 1GHz, impedance approximately 1pF capacitive.
Enable
TTL/CMOS compatible input. Bias current approximately zero.
CONVERSION GAIN DEFINITIONS
Referring to the figure above, we define the ratio of V_A (at the IF
frequency) to V_I (at the RF frequency) to be the Available Voltage
Conversion Gain, or more simply Voltage Conversion Gain,
PIN DESCRIPTIONS AND OPERATIONAL LIMITS
RF_INA
Input of LNA, AC coupling required, DC = 0.78V, frequency range
from DC to 2GHz, gain at low frequencies is 40dB — so be careful
of overload, impedance below 50Ω, shunt 15-18nH inductor helps
input match and noise figure.
RF_OUTA
Output of LNA, AC coupling required, DC = 1.27V, frequency range
from DC to 2GHz, impedance above 50Ω.
BYPASS
Bypass capacitor should be 100 times larger than the largest signal
coupling capacitor for the LNA, DC = 1.05V.
RF_INMX
Mixer RF port, AC coupling required, DC = 1.43V, frequency range
from 100MHz to 2.5GHz, impedance close to 50Ω resistive.
10µH R_L1
IF FILTER
V_O
V_A
1kΩ ^RL2
LO
V_I
RF
SR00092
ǒ Ǔ VG_C
+ 20 log
V_A
V_I
Figure 11.
where V_A and V_I are expressed in similar voltage units (such as
peak-to-peak). The voltage output V_A is decreased by the IF Filter
1993 Dec 15
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