19-6250; Rev 0; 4/12
E V A L U A T I O N K I T A V A I L A B L E
MAX2870
23.5MHz to 6000MHz Fractional/
Integer-N Synthesizer/VCO
General Description
Benefits and Features
The MAX2870 is an ultra-wideband phase-locked
loop (PLL) with integrated voltage control oscillators
(VCOs) capable of operating in both integer-N and
fractional-N modes. When combined with an external
reference oscillator and loop filter, the MAX2870 is
a high-performance frequency synthesizer capable
of synthesizing frequencies from 23.5MHz to 6.0GHz
while maintaining superior phase noise and spurious
performance.
S Integer and Fractional-N Modes
S Manual or Automatic VCO Selection
S 3000MHz to 6000MHz Fundamental VCO
S Output Binary Buffers/Dividers for Extended
Frequency Range
ꢀ 1/2/4/8/16/32/64/128
ꢀ 23.5MHz to 6000MHz
S High-Performance PFD
The ultra-wide frequency range is achieved with the
help of multiple integrated VCOs covering 3000MHz to
6000MHz, and output dividers ranging from 1 to 128.
The device also provides dual differential output drivers,
which can be independently programmable to deliver
-4dBm to +5dBm output power. Both outputs can be
muted by either software or hardware control.
The MAX2870 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, 5mm x 5mm, 32-pin TQFN
package, and operates over an extended -40NC to +85NC
temperature range.
ꢀ 105MHz in Integer-N Mode
ꢀ 50MHz in Fractional-N Mode
S Reference Frequency Up to 200MHz
S Operates from +3.0V to +3.6V Supply
S Dual Programmable Outputs
ꢀ -4dBm to +5dBm
S Analog and Digital Lock Detect Indicators
S Hardware and Software Shutdown Control
S Compatible with 1.8V Control Logic
Applications
Ordering Information appears at end of data sheet.
Wireless Infrastructure
Test and Measurement
Satellite Communications
Wireless LANs/CATV
Military and Aerospace
PMAR/LMAR/Public
Safety Radio
Typical Application Circuit appears at end of data sheet.
For related parts and recommended products to use with this part,
refer to www.maxim-ic.com/MAX2870.related.
Clock Generation
Functional Diagram
MUX_OUT
MUX
MAX2870
LD
LOCK DETECT
CP_OUT
CHARGE
PUMP
MUX
R COUNTER
DIVIDE-BY-2
MUX
REF_IN
X2
CP_GND
CLK
DATA
LE
TUNE
SPI AND
REGISTERS
VCO
INTEGER
FRAC
MODULUS
RFOUTA_P
DIV-BY-
1/2/4/8/16
DIV-BY-
1/2/4/8
RFOUTA_N
RFOUT_EN
MAIN
MODULATOR
RFOUTB_P
RFOUTB_N
MUX
N COUNTER
MUX
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1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.