
EVALUATION KIT AVAILABLE
MAX2870
23.5MHz to 6000MHz Fractional/
Integer-N Synthesizer/VCO
General Description
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.
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 -40 N C to +85 N C
temperature range.
Applications
Benefits and Features
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
? 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
Ordering Information appears at end of data sheet.
Wireless Infrastructure
Test and Measurement
Satellite Communications
PMAR /LMAR/Public
Safety Radio
Clock Generation
Typical Application Circuit appears at end of data sheet.
For related parts and recommended products to use with this part,
refer to www.maximintegrated.com/MAX2870.related .
Wireless LANs/CATV
MUX
Functional Diagram
MUX_OUT
MAX2870
LOCK DETECT
LD
REF_IN
X2
MUX
R COUNTER
DIVIDE-BY-2
MUX
CHARGE
PUMP
CP_OUT
CLK
DATA
LE
SPI AND
REGISTERS
VCO
CP_GND
TUNE
INTEGER
FRAC
MODULUS
DIV-BY-
1/2/4/8/16
DIV-BY-
1/2/4/8
RFOUTA_P
RFOUTA_N
RFOUT_EN
MAIN
MODULATOR
MUX
N COUNTER
MUX
For pricing, delivery, and ordering information, please contact Maxim Direct
at 1-888-629-4642, or visit Maxim’s website at www.maximintegrated.com.
RFOUTB_P
RFOUTB_N
19-6250; Rev 4; 8/13