Datasheet

LTC6946
5
6946fa
ELECTRICAL CHARACTERISTICS
The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
C
= 25°C. V
REF
+
= V
REF0
+
= V
D
+
= V
RF
+
= 3.3V, V
CP
+
= V
VCO
+
= 5V unless otherwise
specified (Note 2). All voltages are with respect to GND.
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
I
CC (3.3V)
Sum V
REF
+
, V
RF
+
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
l
l
l
l
l
l
63
74
83
100
105
110
195
72
82
92
111
117
122
340
mA
mA
mA
mA
mA
mA
μA
Phase Noise and Spurious
L
M
Phase Noise (LTC6946-1, f
VCO
= 3.0GHz,
f
RF
= 3.0GHz, OD[2 :0] = 1 (Note 6))
10kHz Offset
1MHz Offset
40MHz Offset
–80
–130
–157
dBc/Hz
dBc/Hz
dBc/Hz
Phase Noise (LTC6946-2, f
VCO
= 4.0GHz,
f
RF
= 4.0GHz, OD[2 :0] = 1 (Note 6))
10kHz Offset
1MHz Offset
40MHz Offset
–77
–127
–156
dBc/Hz
dBc/Hz
dBc/Hz
Phase Noise (LTC6946-3, f
VCO
= 5.0GHz,
f
RF
= 5.0GHz, OD[2 :0] = 1 (Note 6))
10kHz Offset
1MHz Offset
40MHz Offset
–75
–126
–155
dBc/Hz
dBc/Hz
dBc/Hz
Phase Noise (LTC6946-3, f
VCO
= 5.0GHz,
f
RF
= 2.50GHz, OD[2 :0] = 2 (Note 6))
10kHz Offset
1MHz Offset
40MHz Offset
–81
–132
–155
dBc/Hz
dBc/Hz
dBc/Hz
Phase Noise (LTC6946-3, f
VCO
= 5.0GHz,
f
RF
= 1.667GHz, OD[2 :0] = 3 (Note 6))
10kHz Offset
1MHz Offset
40MHz Offset
–84
–135
–156
dBc/Hz
dBc/Hz
dBc/Hz
Phase Noise (LTC6946-3, f
VCO
= 5.0GHz,
f
RF
= 1.25GHz, OD[2 :0] = 4 (Note 6))
10kHz Offset
1MHz Offset
40MHz Offset
–87
–138
–156
dBc/Hz
dBc/Hz
dBc/Hz
Phase Noise (LTC6946-3, f
VCO
= 5.0GHz,
f
RF
= 1.00GHz, OD[2 :0] = 5 (Note 6))
10kHz Offset
1MHz Offset
40MHz Offset
–89
–140
–157
dBc/Hz
dBc/Hz
dBc/Hz
Phase Noise (LTC6946-3, f
VCO
= 5.0GHz,
f
RF
= 0.833GHz, OD[2 :0] = 6 (Note 6))
10kHz Offset
1MHz Offset
40MHz Offset
–90
–141
–158
dBc/Hz
dBc/Hz
dBc/Hz
L
M(NORM)
Normalized In-Band Phase Noise Floor I
CP
= 11.2mA (Notes 7, 8, 9) –226 dBc/Hz
L
M(NORM – 1/f)
Normalized In-Band 1/f Phase Noise I
CP
= 11.2mA (Notes 7, 10) –274 dBc/Hz
L
M(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 f
OFFSET
= f
PFD
, 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 (θ
JC
= 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 ≤ V
CP
≤ (V
CP
+
– 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,
f
REF
= 10MHz, P
REF
= 13dBm.
Note 9: Output phase noise floor is calculated from normalized phase
noise floor by L
M(OUT)
= –226 + 10log
10
(f
PFD
) + 20log
10
(f
RF
/f
PFD
).
Note 10: Output 1/f phase noise is calculated from normalized 1/f phase
noise by L
M(OUT – 1/f)
= –274 + 20log
10
(f
RF
) – 10log
10
(f
OFFSET
).
Note 11: I
CP
= 11.2mA, f
PFD
= 250kHz, FILT[1:0] = 3, Loop BW = 25kHz;
f
RF
= 900MHz, f
VCO
= 2.7GHz (LTC6946-1), f
VCO
= 3.6GHz (LTC6946-2),
f
VCO
= 4.5GHz (LTC6946-3).
Note 12: I
CP
= 11.2mA, f
PFD
= 1MHz, FILT[1:0] = 3, Loop BW = 40kHz;
f
RF
= 900MHz, f
VCO
= 2.7GHz (LTC6946-1), f
VCO
= 3.6GHz (LTC6946-2),
f
VCO
= 4.5GHz (LTC6946-3).
Note 13: Measured using DC1705A.