Data Sheet
AD9518-1
Parameter
Min
Typ
Max
Unit
Test Conditions/Comments
CHARGE PUMP (CP)
ICP Sink/Source
CPV is CP pin voltage; VCP is charge pump power supply voltage
Programmable
High Value
Low Value
4.8
0.60
2.5
2.7/10
1
2
1.5
2
mA
mA
%
kΩ
nA
%
With CPRSET = 5.1 kΩ
Absolute Accuracy
CPRSET Range
ICP High Impedance Mode Leakage
Sink-and-Source Current Matching
ICP vs. CPV
ICP vs. Temperature
PRESCALER (PART OF N DIVIDER)
Prescaler Input Frequency
P = 1 FD
CPV = VCP/2 V
0.5 < CPV < VCP − 0.5 V
0.5 < CPV < VCP − 0.5 V
CPV = VCP/2 V
%
%
See the VCXO/VCO Feedback Divider N—P, A, B, R section
300
600
900
200
1000
2400
3000
3000
300
MHz
MHz
MHz
MHz
MHz
MHz
MHz
MHz
MHz
P = 2 FD
P = 3 FD
P = 2 DM (2/3)
P = 4 DM (4/5)
P = 8 DM (8/9)
P = 16 DM (16/17)
P = 32 DM (32/33)
Prescaler Output Frequency
A, B counter input frequency (prescaler input frequency divided
by P)
PLL DIVIDER DELAYS
Register 0x019: R, Bits[5:3]; N, Bits[2:0] (see Table 44)
000
001
010
011
100
101
110
111
Off
ps
ps
ps
ps
ps
ps
ps
ps
330
440
550
660
770
880
990
NOISE CHARACTERISTICS
In-Band Phase Noise of the Charge
Pump/Phase Frequency Detector
(In-Band Is Within the LBW of the PLL)
The PLL in-band phase noise floor is estimated by measuring the
in-band phase noise at the output of the VCO and subtracting
20 log(N) (where N is the value of the N divider)
At 500 kHz PFD Frequency
At 1 MHz PFD Frequency
At 10 MHz PFD Frequency
At 50 MHz PFD Frequency
PLL Figure of Merit (FOM)
−165
−162
−151
−143
−220
dBc/Hz
dBc/Hz
dBc/Hz
dBc/Hz
dBc/Hz Reference slew rate > 0.25 V/ns; FOM + 10 log(fPFD) is an approxi-
mation of the PFD/CP in-band phase noise (in the flat region) inside
the PLL loop bandwidth; when running closed-loop, the phase
noise, as observed at the VCO output, is increased by 20 log(N)
PLL DIGITAL LOCK DETECT WINDOW2
Signal available at LD, STATUS, and REFMON pins
when selected by appropriate register settings
Required to Lock (Coincidence of Edges)
Low Range (ABP 1.3 ns, 2.9 ns)
High Range (ABP 1.3 ns, 2.9 ns)
High Range (ABP 6.0 ns)
Selected by Register 0x017[1:0] and Register 0x018[4]
3.5
7.5
3.5
ns
ns
ns
Register 0x017[1:0] = 00b, 01b,11b; Register 0x018[4] = 1b
Register 0x017[1:0] = 00b, 01b, 11b; Register 0x018[4] = 0b
Register 0x017[1:0] = 10b; Register 0x018[4] = 0b
To Unlock After Lock (Hysteresis)2
Low Range (ABP 1.3 ns, 2.9 ns)
High Range (ABP 1.3 ns, 2.9 ns)
High Range (ABP 6.0 ns)
7
15
11
ns
ns
ns
Register 0x017[1:0] = 00b, 01b, 11b; Register 0x018[4] = 1b
Register 0x017[1:0] = 00b, 01b, 11b; Register 0x018[4] = 0b
Register 0x017[1:0] = 10b; Register 0x018[4] = 0b
1
REFIN
REFIN and
self-bias points are offset slightly to avoid chatter on an open input condition.
2 For reliable operation of the digital lock detect, the period of the PFD frequency must be greater than the unlock-after-lock time.
Rev. C | Page 5 of 64