LTC6945I データシートの表示（PDF） - Linear Technology
部品番号
コンポーネント説明
メーカー
LTC6945I Datasheet PDF : 28 Pages
| |||
LTC6945
ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TC = 25°C. VREF+ = VREF0+ = VD+ = VRF+ = VVCO+ = 3.3V, VCP+ = 5V unless otherwise
specified. All voltages are with respect to GND.
SYMBOL PARAMETER
Phase Noise and Spurious
LM(MIN)
Output Phase Noise Floor (Note 5)
LM(NORM) Normalized In-Band Phase Noise Floor
LM(NORM –1/f) Normalized In-Band 1/f Phase Noise
LM(IB)
In-Band Phase Noise Floor
Integrated Phase Noise from 100Hz to
40MHz
Spurious
CONDITIONS
RFO[1:0] = 3, OD[2:0] = 1, fRF = 6GHz
RFO[1:0] = 3, OD[2:0] = 2, fRF = 3GHz
RFO[1:0] = 3, OD[2:0] = 3, fRF = 2GHz
RFO[1:0] = 3, OD[2:0] = 4, fRF = 1.5GHz
RFO[1:0] = 3, OD[2:0] = 5, fRF = 1.2GHz
RFO[1:0] = 3, OD[2:0] = 6, fRF = 1.0GHz
ICP = 11.2mA (Notes 6, 7, 8)
ICP = 11.2mA (Notes 6, 9)
(Notes 6, 7, 8, 10)
(Notes 4, 7, 10)
Reference Spur, PLL locked (Notes 4, 7, 10, 11)
MIN TYP MAX
UNITS
–155
dBc/Hz
–155
dBc/Hz
–156
dBc/Hz
–156
dBc/Hz
–157
dBc/Hz
–158
dBc/Hz
–226
dBc/Hz
–274
dBc/Hz
–99
dBc/Hz
0.13
°RMS
–102
dBc
Note 1: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2: The LTC6945I is guaranteed to meet the specified performance
limits over the –40°C to 105°C case temperature range.
Note 3: For 0.8V ≤ VCP ≤ (VCP+ – 0.8V).
Note 4: VCO is Crystek CVCO55CL-0902-0928.
Note 5: fVCO = 6GHz, fOFFSET = 40MHz.
Note 6: Measured inside the loop bandwidth with the loop locked.
Note 7: Reference frequency supplied by Wenzel 501-04608A,
fREF = 10MHz, PREF = 13dBm.
Note 8: Output phase noise floor is calculated from normalized phase
noise floor by LM(OUT) = –226 + 10log10(fPFD) + 20log10(fRF/fPFD).
Note 9: Output 1/f phase noise is calculated from normalized 1/f phase
noise by LM(OUT –1/f) = –274 + 20log10 (fRF) – 10log10 (fOFFSET).
Note 10: ICP = 11.2mA, fPFD = 250kHz, fRF = 914MHz, FILT[1:0] = 3, Loop
BW = 7kHz.
Note 11: Measured using DC1649A.
TYPICAL PERFORMANCE CHARACTERISTICS
REF Input Sensitivity vs
Frequency
–15
–20
–25
–30
BST = 1
FILT = 0
105°C
25°C
–40°C
–35
–40
–45
–50
–55
0 25 50 75 100 125 150 175 200 225 250
FREQUENCY (MHz)
6945 G01
REFO Output Power vs Frequency
4
105°C
3
25°C
–40°C
2
1
0
–1
–2
–3
–4
0 25 50 75 100 125 150 175 200 225 250
FREQUENCY (MHz)
6945 G02
REFO Phase Noise
–140
–145
POUT = 1.45dBm
fREF = 10MHz
BST = 1
FILT = 3
NOTE 7
–150
–155
–160
100
1k
10k 100k 1M 5M
OFFSET FREQUENCY (Hz)
6945 G03
6945f
5
Share Link: 