LT5568 查看數據表（PDF） - Linear Technology
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LT5568 Datasheet PDF : 16 Pages
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LT5568
TYPICAL PERFOR A CE CHARACTERISTICS VCC = 5V, EN = High, TA = 25°C, fLO = 850MHz,
PLO = 0dBm. BBPI, BBMI, BBPQ, BBMQ inputs 0.54VDC, Baseband Input Frequency fBB = 2MHz, I&Q 90° shifted. fRF = fBB + fLO (upper
sideband selection). PRF, OUT = –10dBm (–10dBm/tone for 2-tone measurements), unless otherwise noted. (Note 3)
RF CW Output Power, HD2 and
HD3 vs CW Baseband Voltage
and Supply Voltage
–10
10
–20
RF
0
5V
4.5V
–30
–10
HD3
–40
–20
LO Feedthrough to RF Output
vs CW Baseband Voltage
–36
5V, –40°C
5V, 25°C
5V, 85°C
–38
4.5V, 25°C
5.5V, 25°C
Image Rejection
vs CW Baseband Voltage
–35
5V, –40°C
5V, 25°C
5V, 85°C
–40
4.5V, 25°C
5.5V, 25°C
–40
–45
–50
5V
–30
HD2
4.5V
–60
–40
5.5V
–42
–50
–70
–50
–80
–60
0
1
2
3
4
5
I AND Q BASEBAND VOLTAGE (VP–P, DIFF)
HD2 = MAX POWER AT fLO + 2 • fBB OR fLO – 2 • fBB
HD3 = MAX POWER AT fLO + 3 • fBB OR fLO – 3 • fBB
5568 G18
RF Two-Tone Power (Each Tone),
IM2 and IM3 vs Baseband Voltage
and Temperature
10
0
RF
–40°C
85°C
–10
–20
25°C
–40°C
–30
25°C
85°C
–40
–50
IM3
25°C
–40°C
–60
IM2
85°C
–70
–80
0.1
fBBI = 2MHz, 2.1MHz, 0°
fBBQ = 2MHz, 2.1MHz, 90°
1
10
I AND Q BASEBAND VOLTAGE (VP–P, DIFF, EACH TONE)
IM2 = POWER AT fLO + 4.1MHz
IM3 = MAX POWER AT fLO + 1.9MHz OR fLO + 2.2MHz
–44
0
1
2
3
4
5
I AND Q BASEBAND VOLTAGE (VP–P, DIFF)
5568 G19
–55
0
1
2
3
4
5
I AND Q BASEBAND VOLTAGE (VP–P, DIFF)
5568 G20
RF Two-Tone Power (Each Tone),
IM2 and IM3 vs Baseband Voltage
and Supply Voltage
10
0
RF
4.5V
–10
4.5V
–20
5V, 5.5V
5V, 5.5V
–30
IM3
–40
5V
–50
4.5V
–60
IM2
5.5V
–70
–80
0.1
fBBI = 2MHz, 2.1MHz, 0°
fBBQ = 2MHz, 2.1MHz, 90°
1
10
I AND Q BASEBAND VOLTAGE (VP–P, DIFF, EACH TONE)
IM2 = POWER AT fLO + 4.1MHz
IM3 = MAX POWER AT fLO + 1.9MHz OR fLO + 2.2MHz
Gain Distribution
60
50
–40°C
25°C
85°C
40
30
20
10
0
–8
–7.5
–7
–6.5 –6
GAIN (dB)
5568 G23
Noise Floor Distribution
60
–40°C
25°C
50
85°C
fNOISE = 870MHz
40
30
20
10
LO Leakage Distribution
40
–40°C
25°C
85°C
PLO = –10dBm
NO BASEBAND
APPLIED
30
20
10
Image Rejection Distribution
50
–40°C
25°C
40
85°C
VBB = 800mVP-P,DIFF
30
20
10
0
–160.8
–160.4 –160 –159.6
NOISE FLOOR (dBm/Hz)
–159.2
5568 G24
6
0
–54
–50 –46 –42 –38
LO LEAKAGE (dBm)
–34
5568 G25
0
< –60
–56
–52
–48
IMAGE REJECTION (dBc)
–44
5568 G26
5568f
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