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LTC6948 bảng dữ liệu(PDF) 7 Page - Analog Devices

tên linh kiện LTC6948
Giải thích chi tiết về linh kiện  Fractional-N Synthesizer Integrated VCO
PDF  38 Pages
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LTC6948 bảng dữ liệu(HTML) 7 Page - Analog Devices

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LTC6948
7
6948fa
For more information www.linear.com/LTC6948
TA = 25°C. VREF+ = VD+ = VRF+ = 3.3V, VCP+ = VVCO+ =
5V, INTN = 0, DITHEN = 1, CPLE = 1, RFO[1:0] = 3, unless otherwise noted.
Typical perForMance characTerisTics
RF Output HD3 vs Output Divide
(Single-Ended on RF+)
Charge Pump Source Current
Error vs Voltage, Temperature
MUTE Output Power vs fVCO and
Output Divide
(Single-Ended on RF+)
RF Output Power vs Frequency
(Single-Ended on RF+)
LTC6948-3 Frequency Step
Transient
RF Output HD2 vs Output Divide
(Single-Ended on RF+)
LTC6948-1 VCO Tuning Sensitivity
LTC6948-2 VCO Tuning Sensitivity
LTC6948-3 VCO Tuning Sensitivity
OUTPUT VOLTAGE (V)
0
1
3
5
4.0
6948 G07
–1
–3
0
2
4
–2
–4
–5
1.0
0.5
2.0
1.5
3.0 3.5
4.5
2.5
5.0
105°C
25°C
–40°C
ICP = 11.2mA
CPLE = 0
FREQUENCY (GHz)
0.5
–2.5
0.5
1.0
2.0
1.5
1.5
3.5
4.5
6948 G08
–0.5
–1.5
–3.0
0
–3.5
–1.0
–2.0
2.5
5.5
6.5
105°C
25°C
–40°C
LTC6948-4
LC = 68nH
CS = 100pF
fVCO (GHz)
4.2
–55
–50
–45
–40
–35
–30
5.0
5.8
6.6
6948 G09
–25
–20
4.6
5.4
6.2
LTC6948-4, LC = 68nH,
CS = 100pF , fRF = fVCO/O
O = 3
O = 2
O = 1
O = 6
O = 4
O = 5
4.2
5.0
5.8
6.6
4.6
5.4
6.2
fVCO (GHz)
–45
–40
–35
–30
–25
–20
6948 G10
–15
–10
–5
LTC6948-4
LC = 68nH
CS = 100pF
fRF = fVCO/O
O = 6
O = 3
O = 2
O = 1
O = 5
O = 4
4.2
5.0
5.8
6.6
4.6
5.4
6.2
fVCO (MHz)
–75
–65
–55
6948 G11
–85
–95
–45
LTC6948-4, LC = 68nH
CS = 100pF, fRF = fVCO/O
O = 1
O = 4
O = 6
O = 5
O = 2
O = 3
TIME (µs)
–5
0
2.2
2.3
2.4
2.5
2.6
2.7
2.8
2.9
3.0
5
10
15
20
6948 G12
25
CALIBRATION TIME
126MHz STEP
fPFD = 61.44MHz
fCAL = 1.28MHz
LOOP BW = 180kHz
MTCAL = 0
O = 2
FREQUENCY (GHz)
2.2 2.4 2.6 2.8
3.0
3.5
4.5
5.0
5.5
8.0
6.5
6948 G13
4.0
7.0
7.5
6.0
3.8
3.6
3.4
3.2
3.0
FREQUENCY (GHz)
3.0 3.2 3.4 3.6 3.8
3.0
3.5
4.5
5.0
5.5
8.0
6.5
6948 G14
4.0
7.0
7.5
6.0
5.0
4.8
4.6
4.4
4.2
4.0
FREQUENCY (GHz)
3.8
2.5
3.0
4.0
4.5
5.0
5.0
7.0
6948 G15
3.5
4.2
5.4
4.6
5.8
5.5
6.0
6.5



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