SA620 Datasheet, PDF (1/11 Pages) NXP Semiconductors – Low voltage LNA, mixer and VCO - 1GHz

Philips Semiconductors RF Communications Products
Low voltage LNA, mixer and VCO — 1GHz
Product specification
SA620
DESCRIPTION
The SA620 is a combined RF amplifier, VCO
with tracking bandpass filter and mixer
designed for high-performance low-power
communication systems from 800-1200MHz.
The low-noise preamplifier has a 1.6dB noise
figure at 900MHz with 11.5dB gain and an
IP3 intercept of -3dBm at the input. The gain
is stabilized by on-chip compensation to vary
less than ±0.2dB over -40 to +85°C
temperature range. The wide-dynamic-range
mixer has an 9dB noise figure and IP3 of
–6dBm at the input at 900MHz. An external
LO can be used in place of the internal VCO
for improved mixer input IP3 and a 3mA
reduction in current. The chip incorporates a
through-mode option so the RF amplifier can
be disabled and replaced by an attenuator
(S₂₁ = –7.5dB). This is useful for improving
the overall dynamic range of the receiver
when in an overload situation. The nominal
current drawn from a single 3V supply is
10.4mA and 7.2mA in the thru-mode.
Additionally, the VCO and Mixer can be
powered down to further reduce the supply
current to 1.2mA.
FEATURES
• Low current consumption: 10.4mA nominal,
7.2mA with thru-mode activated
• Outstanding noise figure: 1.6dB for the
amplifier and 9dB for the mixer at 900MHz
• Excellent gain stability versus temperature
and supply voltage
• Switchable overload capability
• Independent LNA, mixer and VCO power
down capability
• Internal VCO automatic leveling loop
• Monotonic VCO frequency vs control
voltage
APPLICATIONS
• 900MHz cellular front-end
• 900MHz cordless front-end
• Spread spectrum receivers
• RF data links
• UHF frequency conversion
• Portable radio
PIN CONFIGURATION
DK Package
LNA ENABLE ¹
LNA GND 2
LNA IN ³
LNA GND 4
LNA GND 5
OSC GND ⁶
MIXER PWRDN 7
OSC PWRDN ⁸
OSC1 9
OSC2 10
20 V_CC
19 LNA GND
18 LNA OUT
17 LNA BIAS
16 MIXER IN
15 MIXER GND
14 MIXER BYPASS
13 MIXER OUT
12 OSC GND
11 VCO OUT
ORDERING INFORMATION
DESCRIPTION
20-Pin Plastic Shrink Small Outline Package (Surface-mount, SSOP)
TEMPERATURE RANGE
-40 to +85°C
ORDER CODE
SA620DK
DWG #
1563
BLOCK DIAGRAM
V_CC
20
LNA
GND
LNA
OUT
19
18
LNA
BIAS
17
MIXER
IN
16
MIXER MIXER MIXER
GND BYPASS OUT
15
14
13
OSC
GND
12
VCO
OUT
11
LNA
RF
AUTOMATIC
LEVELING
LOOP
IF
LO
TRACKING
BANDPASS
FILTER
VCO
1
2
3
LNA
ENABLE
LNA
GND
LNA IN
4
LNA
GND
5
LNA
GND
6
7
8
9
OSC
GND
MIXER
OSC
PWRDN PWRDN
OSC1
10
OSC2
December 15, 1993
2
853-1725 11658