EVALUATION KIT AVAILABLE
MAX2880
250MHz to 12.4GHz, High-Performance,
Fractional/Integer-N PLL
General Description
The MAX2880 is a high-performance phase-locked
loop (PLL) capable of operating in both integer-N and
fractional-N modes. Combined with an external reference
oscillator, loop filter, and VCO, the device forms an ultra-
low noise and low-spur frequency synthesizer capable of
accepting RF input frequencies of up to 12.4GHz.
The MAX2880 consists of a high-frequency and low-
noise-phase frequency detector (PFD), precision charge
pump, 10-bit programmable reference counter, 16-bit
integer N counter, and 12-bit variable modulus fractional
modulator.
The MAX2880 is controlled by a 3-wire serial interface
and is compatible with 1.8V control logic. The device is
available in a lead-free, RoHS-compliant, 20-pin TQFN
and 16-pin TSSOP packages, and operates over an
extended -40°C to +85°C temperature range.
Benefits and Features
● Integer and Fractional-N Modes
● 250MHz to 12.4GHz Broadband RF Input
● Normalized In-Band Noise Floor
• -229dBc/Hz in Integer Mode
• -227dBc/Hz in Fractional Mode
● -10dBm to +5dBm Wide Input Sensitivity
● Low-Noise Phase Frequency Detector
• 125MHz in Fractional Mode
• 140MHz in Integer Mode
● Reference Frequency Up to 210MHz
● Operates from +2.8V to +3.6V Supply
● Cycle Slip Reduction and Fast Lock
● Software and Hardware Shutdown
● Software Lock Detect
● On-Chip Temperature Sensor
● Compatible with +1.8V Control Logic
● Phase Adjustment
Ordering Information
appears at end of data sheet.
Applications
●
●
●
●
●
Microwave Point-to-Point Systems
Wireless Infrastructure
Satellite Communications
Test and Measurement
RF DAC and ADC Clocks
Functional Diagram
VCP
MUX
MUX
REF
x2
DAT
LE
CLK
12-BIT
FRAC
REF
DIV
÷2
PFD
CP
CP
SPI AND REGISTERS
LD
RFINN
RFINP
12-BIT
MOD
16-BIT
INT
÷2
MUX
PROGRAMMABLE MAIN
MODULATOR
+
CE
N
COUNTER
MUX I/O
MAX2880
MUX
19-6871; Rev 1; 11/15
MAX2880
250MHz to 12.4GHz, High-Performance,
Fractional/Integer-N PLL
Absolute Maximum Ratings
V
CC_
to GND_......................................................-0.3V to +3.9V
V
CP
to GND_........................................................-0.3V to +5.8V
CP to GND_ ............................................. -0.3V to (V
CP
+ 0.3V)
All Other Pins to GND_ .......................... -0.3V to (V
CC_
+ 0.3V)
RFINP, RFINN ................................................................+10dBm
Continuous Power Dissipation (T
A
= +70°C)
TQFN (derate 25.6mW/°C above +70°C)...............2051.3mW
Junction Temperature ......................................................+150°C
Operating Temperature Range ........................... -40°C to +85°C
Storage Temperature Range ............................ -65°C to +150°C
Lead Temperature (soldering, 10s) ................................ +300°C
Soldering Temperature (reflow) .......................................+260°C
Package Thermal Characteristics
(Note 1)
TQFN
Junction-to-Ambient Thermal Resistance (θ
JA
) ..........39°C/W
Junction-to-Case Thermal Resistance (θ
JC
) .................6°C/W
TSSOP
Junction-to-Ambient Thermal Resistance (θ
JA
) ..........90°C/W
Junction-to-Case Thermal Resistance (θ
JC
) ...............27°C/W
Note 1:
Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a four-layer
board. For detailed information on package thermal considerations, refer to
www.maximintegrated.com/thermal-tutorial.
DC Electrical Characteristics
(Measured using the MAX2880 Evaluation Kit. V
CC_
= 3V to 3.6V, V
CP
= V
CC_
to 5.5V, V
GND_
= 0V, f
REF
= 50MHz, f
PFD
= 50MHz,
T
A
= -40°C to +85°C. Typical values measured at V
CC_
= 3.3V, V
CP
= 5V, T
A
= +25°C, no RF applied, Registers 0 through 4 settings:
303C0000, 00000009, 00008052, 00000BC3, 00000084, unless otherwise noted.) (Note 2)
PARAMETER
Supply Voltage (V
CC_
)
Charge-Pump Supply (V
CP
)
PRE = 0, RFINN = 6GHz
V
CC_
Supply Current
V
CP
Supply Current
PRE = 1, RFINN = 12GHz
Shutdown Mode
0.65
CONDITIONS
MIN
2.8
V
CC_
39
49
TYP
3.3
MAX
3.6
5.5
50
59
1
2.0
mA
mA
UNITS
V
V
AC Electrical Characteristics
(Measured using the MAX2880 Evaluation Kit. V
CC_
= 3V to 3.6V, V
CP
= V
CC_
to 5.5V, V
GND_
= 0V, f
REF
= 50MHz, f
PFD
= 50MHz,
f
RFINN
= 6000MHz, T
A
= -40°C to +85°C. Typical values measured at V
CC_
= 3.3V, V
CP
= 5V, T
A
= +25°C, P
RFINN
= 2dBm, Registers
0 through 4 settings: 303C0000, 00000009, 00008052, 00000BC3, 00000084, unless otherwise noted.) (Note 2)
PARAMETER
Input Frequency
Input Power
REF Input Frequency Range
REF Input Sensitivity
REF Input Capacitance
REF Input Current
Phase Detector Frequency
Sink/Source Current
Fractional mode
Integer mode
CP[3:0] = 1111, R
RSET
= 5.1kΩ
CP[3:0] = 0000, R
RSET
= 5.1kΩ
5.12
0.32
-60
CONDITIONS
MIN
250
-10
10
0.7
2
+60
125
140
TYP
MAX
12,400
+5
210
V
CC_
UNITS
MHz
dBm
MHz
V
P-P
pF
µA
MHz
mA
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Maxim Integrated │ 2
MAX2880
250MHz to 12.4GHz, High-Performance,
Fractional/Integer-N PLL
AC Electrical Characteristics (continued)
(Measured using the MAX2880 Evaluation Kit. V
CC_
= 3V to 3.6V, V
CP
= V
CC_
to 5.5V, V
GND_
= 0V, f
REF
= 50MHz, f
PFD
= 50MHz,
f
RFINN
= 6000MHz, T
A
= -40°C to +85°C. Typical values measured at V
CC_
= 3.3V, V
CP
= 5V, T
A
= +25°C, P
RFINN
= 2dBm, Registers
0 through 4 settings: 303C0000, 00000009, 00008052, 00000BC3, 00000084, unless otherwise noted.) (Note 2)
PARAMETER
RSET Range
Charge-Pump Output Voltage
In-Band Noise Floor
1/f Noise
In-Band Phase Noise
Integrated RMS Jitter
Spurious Signals Due to PFD
ADC Resolution
Temperature Sensor Accuracy
T
A
= -40°C to +85°C
Normalized (Note 3)
Normalized (Note 4)
(Note 5)
(Note 6)
CONDITIONS
MIN
2.7
0.5
-229
-122
-101
0.14
-84
7
±2.0
TYP
MAX
10
V
CP
- 0.5
UNITS
kΩ
V
dBc/Hz
dBc/Hz
dBc/Hz
ps
dBc
Bits
°C
Digital I/O Characteristics
PARAMETER
Input Logic-Level Low
Input Logic-Level High
Input Current
Input Capacitance
Output Logic-Level Low
Output Logic-Level High
Output Current Level High
(V
CC_
= 3V to 3.6V, V
GND_
= 0V, T
A
= -40°C to +85°C. Typical values at V
CC_
= 3.3V, T
A
= +25°C.) (Note 2)
SYMBOL
V
IL
V
IH
I
IH
/I
IL
V
OL
V
OH
I
OH
0.3mA sink current
0.3mA source current
V
CC_
-
0.4
0.5
-1
1
0.4
CONDITIONS
MIN
TYP
0.4
1.5
+1
MAX
UNITS
V
V
µA
pF
V
V
mA
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Maxim Integrated │ 3
MAX2880
250MHz to 12.4GHz, High-Performance,
Fractional/Integer-N PLL
SPI Timing Characteristics
(V
CC_
= 3V to 3.6V, V
GND_
= 0V, T
A
= -40°C to +85°C. Typical values at V
CC_
= 3.3V, T
A
= +25°C.) (Note 2)
PARAMETER
CLK Clock Period
CLK Pulse-Width Low
CLK Pulse-Width High
LE Setup Time
LE Hold Time
LE Minimum Pulse-Width High
Data Setup Time
Data Hold Time
MUX Setup Time
MUX Hold Time
SYMBOL
t
CP
t
CL
t
CH
t
LES
t
LEH
t
LEW
t
DS
t
DH
t
MS
t
MH
CONDITIONS
Guaranteed by SCL pulse-width
low and high
MIN
TYP
50
25
25
20
10
20
25
25
10
10
MAX
UNITS
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
Note 2:
Production tested at T
A
= +25°C. Cold and hot are guaranteed by design and characterization.
Note 3:
Measured at 100kHz offset with 50MHz Bliley NV108C1954 OCVCXO with 500kHz loop bandwidth. Registers 0 through 4
settings: 303C0000, 00000009, 0F008052, 000025C3, 00000094.
Note 4:
1/f noise contribution to the in-band noise is computed by using 1/f
NOISE
= PN - 10log(10kHz/f
OFFSET
)
- 20log(f
RF
/1GHz). Registers 0 through 4 settings: 303C0000, 00000009, 0F008052, 000025C3, 00000094.
Note 5:
f
REF
= 50MHz; f
PFD
= 50MHz; offset frequency = 10kHz; VCO frequency = 6GHz, N = 120; loop BW = 100kHz,
CP[3:0] = 1111; integer mode. Registers 0 through 4 settings 303C0000, 00000009, 0F008052, 000025C3, 00000094.
Note 6:
f
REF
= 50MHz; f
PFD
= 50MHz; VCO frequency = 6GHz; N = 120; loop BW = 100kHz, CP[3:0] = 1111; integer mode.
Registers 0 through 4 settings 303C0000, 00000009, 0F008052, 000025C3, 00000094.
Typical Operating Characteristics
(Measured using the MAX2880 Evaluation Kit. V
CC_
= 3.3V, V
GND_
= 0V, V
CP
= 5.0V, CP[3:0]= 1111, f
RFINN
= 6GHz, f
REF
= 50MHz,
f
PFD
= 50MHz, T
A
= +25°C, unless otherwise noted. See
Table 1
and
Table 2).
NORMALIZED IN-BAND NOISE FLOOR
vs. TUNE VOLTAGE
NORMALIZED IN-BAND NOISE FLOOR (dBc/Hz)
-215
OFFSET = 100kHz
-220
FRAC-N LOW NOISE
toc03
NORMALIZED IN-BAND NOISE FLOOR
vs. TEMPERATURE
NORMALIZED IN-BAND NOISE FLOOR (dBc/Hz)
OFFSET = 100kHz
-220
FRAC-N LOW NOISE
NORMALIZED IN-BAND NOISE FLOOR (dBc/Hz)
-215
toc01
NORMALIZED IN-BAND NOISE FLOOR
vs. CP CURRENT CODE
-215
OFFSET = 100kHz
-220
FRAC-N LOW SPUR
toc02
FRAC-N LOW SPUR
FRAC-N LOW SPUR
-225
-225
-225
-230
INTEGER-N
-235
-40
-15
10
35
60
85
-230
FRAC-N LOW NOISE
INTEGER-N
-235
0
3
6
9
12
15
-230
INTEGER-N
-235
0.5
1
1.5
2
2.5
3
3.5
4
TEMPERATURE (°C)
CP CURRENT CODE
V
TUNE
(V)
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Maxim Integrated │ 4
MAX2880
250MHz to 12.4GHz, High-Performance,
Fractional/Integer-N PLL
Typical Operating Characteristics (continued)
(Measured using the MAX2880 Evaluation Kit. V
CC_
= 3.3V, V
GND_
= 0V, V
CP
= 5.0V, CP[3:0]= 1111, f
RFINN
= 6GHz, f
REF
= 50MHz,
f
PFD
= 50MHz, T
A
= +25°C, unless otherwise noted. See
Table 1
and
Table 2).
NORMALIZED 1/f NOISE vs. TEMPERATURE
-110
OFFSET = 10kHz
NORMALIZED 1/f NOISE (dBc/Hz)
-115
toc04
NORMALIZED 1/f NOISE
vs. CP CURRENT CODE
-110
OFFSET = 10kHz
NORMALIZED 1/f NOISE (dBc/Hz)
-115
FRAC-N LOW SPUR
toc05
NORMALIZED 1/f NOISE
vs. TUNE VOLTAGE
-110
OFFSET = 10kHz
NORMALIZED 1/f NOISE (dBc/Hz)
-115
FRAC-N LOW SPUR
toc06
FRAC-N LOW SPUR
-120
-120
FRAC-N LOW NOISE
INTEGER-N
-120
-125
FRAC-N LOW NOISE
-130
INTEGER-N
-125
-125
FRAC-N LOW NOISE
INTEGER-N
-40
-15
10
35
60
85
-130
0
3
6
9
12
15
-130
0.5
1
1.5
2
2.5
3
3.5
4
TEMPERATURE (°C)
CP CURRENT CODE
V
TUNE
(V)
INTEGER-N CLOSED-LOOP PHASE NOISE
vs. OFFSET FREQUENCY
-80
CLOSED-LOOP PHASE NOISE (dBc
/
Hz
)
-90
-100
-110
-120
-130
-140
-150
-160
-170
1
10
100
1000
10000
100000
T
A
= -40°C,+25°C
T
A
= +85°C
toc07
CLOSED-LOOP PHASE NOISE (dBc
/
Hz
)
-100
-110
-120
-130
-140
-150
-160
-170
1
10
100
1000
10000
100000
T
A
= -40°C,+25°C
CLOSED-LOOP PHASE NOISE (dBc
/
Hz
)
LBW = 50kHz
-80
-90
FRAC-N LOW-NOISE MODE
CLOSED-LOOP PHASE NOISE
vs. OFFSET FREQUENCY
toc08
LBW = 50kHz
-80
-90
-100
-110
-120
-130
-140
-150
-160
-170
1
FRAC-N LOW-SPUR MODE
CLOSED-LOOP PHASE NOISE
vs. OFFSET FREQUENCY
toc09
LBW = 50kHz
T
A
= +85°C
T
A
= +85°C
T
A
= -40°C,+25°C
10
100
1000
10000
100000
f
OFFSET
(kHz)
f
OFFSET
(kHz)
f
OFFSET
(kHz)
RF INPUT SENSITIVITY vs. FREQUENCY
-5
toc10
RF INPUT SENSITIVITY (dBm)
-15
-25
-35
-45
0
2
4
6
8
10
12
FREQUENCY (GHz)
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