LT5558 View Datasheet(PDF) - Linear Technology
Part Name
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LT5558 Datasheet PDF : 16 Pages
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LT5558
TYPICAL PERFORMANCE CHARACTERISTICS VCC = 5V, EN = High, TA = 25°C, fLO = 900MHz,
fRF = 902MHz, PLO = 0dBm. BBPI, BBMI, BBPQ, BBMQ CM input voltage = 2.1VDC, baseband input frequency = 2MHz, I and Q 90°
shifted, without image or LO feedthrough nulling. fRF = fBB + fLO (upper side-band selection). PRF(OUT) = –10dBm (–10dBm/tone for
2-tone measurements), unless otherwise noted. (Note 3)
Gain Distribution
30 –40°C
25°C
25 85°C
20
VBB = 400mVP-P
Noise Floor Distribution
20
–40°C
25°C
85°C
15
LO Leakage Distribution
40
–40°C
25°C
85°C
30
VBB = 400mVP-P
15
10
20
10
5
10
5
0
8 –7.5 –7 –6.5 –6 –5.5 –5 –4.5 –4 –3.5
GAIN (dB)
5558 G26
0
–158
Image Rejection Distribution
20
VBB = 400mVP-P
15
–40°C
25°C
85°C
10
–157.5
–157
NOISE FLOOR (dBm/Hz)
5558 G27
0
–50 –48 –46 –44 –42 –40 –38 –36
LO LEAKAGE (dBm)
5558 G28
LO Feedthrough and Image
Rejection vs Temperature After
Calibration at 25°C
–40
CALIBRATED WITH PRF = –10dBm
fBBI = 2MHz, 0°
–50 fBBQ = 2MHz, 90° + ϕCAL
LO FEEDTHROUGH
–60
5
–70
5
0
<–66 –62 –58 –54 –50 –46 –42
IMAGE REJECTION (dBc)
5558 G29
–80
IMAGE REJECTION
–90
–40 –20 0
20 40 60 80
TEMPERATURE (°C)
5558 G30
PIN FUNCTIONS
EN (Pin 1): Enable Input. When the Enable pin voltage is
higher than 1V, the IC is turned on. When the Enable volt-
age is less than 0.5V or if the pin is disconnected, the IC
is turned off. The voltage on the Enable pin should never
exceed VCC by more than 0.5V, in order to avoid possible
damage to the chip.
GND (Pins 2, 4, 6, 9, 10, 12, 15, 17): Ground. Pins 6, 9,
15 and the Exposed Pad, Pin 17, are connected to each
other internally. Pins 2 and 4 are connected to each other
internally and function as the ground return for the LO
signal. Pins 10 and 12 are connected to each other inter-
nally and function as the ground return for the on-chip RF
balun. For best RF performance, Pins 2, 4, 6, 9, 10, 12,
15 and the Exposed Pad, Pin 17, should be connected to
the printed circuit board ground plane.
5558fa
7
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