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参数资料
型号： LTC6946IUFD-2#PBF
厂商： Linear Technology
文件页数： 26/30页
文件大小： 0K
描述： IC INTEGER-N PLL W/VCO 28-QFN
软件下载： PLLWizard™
PLLWizard™, with .NET 2.0 installer
标准包装： 73
类型： 时钟/频率合成器（RF/IF），分数-N，整数-N，
PLL： 是
输入： 时钟
输出： 时钟
电路数： 1
比率 - 输入:输出： 1:1
差分 - 输入:输出： 是/是
频率 - 最大： 4.91GHz
除法器/乘法器： 是/是
电源电压： 3.15 V ~ 5.25 V
工作温度： -40°C ~ 105°C
安装类型： 表面贴装
封装/外壳： 28-WFQFN 裸露焊盘
供应商设备封装： 28-QFN（4x5）
包装： 管件
LTC6946
5
6946fa
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+ = 3.3V, VCP+ = VVCO+ = 5V unless otherwise
specified (Note 2). All voltages are with respect to GND.
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
ICC (3.3V)
Sum VREF+, VRF+ Supply Currents
RF Muted, OD[2:0] = 1
RF Enabled, RFO[1:0] =0, OD[2:0] = 1
RF Enabled, RFO[1:0] = 3, OD[2:0] = 1
RF Enabled, RFO[1:0] =3, OD[2:0] = 2
RF Enabled, RFO[1:0] =3, OD[2:0] = 3
RF Enabled, RFO[1:0] =3, OD[2:0] = 4 to 6
PDALL = 1
l
63
74
83
100
105
110
195
72
82
92
111
117
122
340
mA
μA
Phase Noise and Spurious
LM
Phase Noise (LTC6946-1, fVCO = 3.0GHz,
fRF = 3.0GHz, OD[2 :0] = 1 (Note 6))
10kHz Offset
1MHz Offset
40MHz Offset
–80
–130
–157
dBc/Hz
Phase Noise (LTC6946-2, fVCO = 4.0GHz,
fRF = 4.0GHz, OD[2 :0] = 1 (Note 6))
10kHz Offset
1MHz Offset
40MHz Offset
–77
–127
–156
dBc/Hz
Phase Noise (LTC6946-3, fVCO = 5.0GHz,
fRF = 5.0GHz, OD[2 :0] = 1 (Note 6))
10kHz Offset
1MHz Offset
40MHz Offset
–75
–126
–155
dBc/Hz
Phase Noise (LTC6946-3, fVCO = 5.0GHz,
fRF = 2.50GHz, OD[2 :0] = 2 (Note 6))
10kHz Offset
1MHz Offset
40MHz Offset
–81
–132
–155
dBc/Hz
Phase Noise (LTC6946-3, fVCO = 5.0GHz,
fRF = 1.667GHz, OD[2 :0] = 3 (Note 6))
10kHz Offset
1MHz Offset
40MHz Offset
–84
–135
–156
dBc/Hz
Phase Noise (LTC6946-3, fVCO = 5.0GHz,
fRF = 1.25GHz, OD[2 :0] = 4 (Note 6))
10kHz Offset
1MHz Offset
40MHz Offset
–87
–138
–156
dBc/Hz
Phase Noise (LTC6946-3, fVCO = 5.0GHz,
fRF = 1.00GHz, OD[2 :0] = 5 (Note 6))
10kHz Offset
1MHz Offset
40MHz Offset
–89
–140
–157
dBc/Hz
Phase Noise (LTC6946-3, fVCO = 5.0GHz,
fRF = 0.833GHz, OD[2 :0] = 6 (Note 6))
10kHz Offset
1MHz Offset
40MHz Offset
–90
–141
–158
dBc/Hz
LM(NORM)
Normalized In-Band Phase Noise Floor
ICP = 11.2mA (Notes 7, 8, 9)
–226
dBc/Hz
LM(NORM – 1/f) Normalized In-Band 1/f Phase Noise
ICP = 11.2mA (Notes 7, 10)
–274
dBc/Hz
LM(IB)
In-Band Phase Noise Floor
(Notes 7, 8, 9, 11)
–99
dBc/Hz
Integrated Phase Noise from
100Hz to 40MHz
(Notes 8, 12)
0.17
°RMS
Spurious
fOFFSET = fPFD, PLL Locked (Notes 8, 12, 13)
–103
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 LTC6946I is guaranteed functional within the case operating
temperature range from –40°C to 105°C (θJC = 7°/W).
Note 3: Valid for 1.60V ≤ TUNE ≤ 2.85V with part calibrated after a power
cycle or software power-on-reset (POR).
Note 4: Based on characterization.
Note 5: For 0.7V ≤ VCP ≤ (VCP+ – 0.7V).
Note 6: Measured outside the loop bandwidth, using a narrowband loop,
RFO[1:0] = 3.
Note 7: Measured inside the loop bandwidth with the loop locked.
Note 8: Reference frequency supplied by Wenzel 501-04608A,
fREF = 10MHz, PREF = 13dBm.
Note 9: Output phase noise floor is calculated from normalized phase
noise floor by LM(OUT) = –226 + 10log10 (fPFD) + 20log10 (fRF/fPFD).
Note 10: Output 1/f phase noise is calculated from normalized 1/f phase
noise by LM(OUT – 1/f) = –274 + 20log10 (fRF) – 10log10 (fOFFSET).
Note 11: ICP = 11.2mA, fPFD = 250kHz, FILT[1:0] = 3, Loop BW = 25kHz;
fRF = 900MHz, fVCO = 2.7GHz (LTC6946-1), fVCO = 3.6GHz (LTC6946-2),
fVCO = 4.5GHz (LTC6946-3).
Note 12: ICP = 11.2mA, fPFD = 1MHz, FILT[1:0] = 3, Loop BW = 40kHz;
fRF = 900MHz, fVCO = 2.7GHz (LTC6946-1), fVCO = 3.6GHz (LTC6946-2),
fVCO = 4.5GHz (LTC6946-3).
Note 13: Measured using DC1705A.
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