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PDF MAX2870 Data sheet ( Hoja de datos )

Número de pieza MAX2870
Descripción 23.5MHz to 6000MHz Fractional/Integer-N Synthesizer/VCO
Fabricantes Maxim Integrated　
Logotipo Maxim Integrated Logotipo



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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 -40NC to +85NC
temperature range.
Applications
Wireless Infrastructure
Test and Measurement
Satellite Communications
Wireless LANs/CATV
PMAR /LMAR/Public
Safety Radio
Clock Generation
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.
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.
Functional Diagram
MAX2870
REF_IN
CLK
DATA
LE
MUX R COUNTER
X2
SPI AND
REGISTERS
INTEGER
FRAC
MODULUS
DIVIDE-BY-2
MUX
VCO
DIV-BY-
1 / 2 /4 / 8 / 16
N COUNTER
MAIN
MODULATOR
MUX
MUX
LOCK DETECT
CHARGE
PUMP
DIV-BY-
1 / 2 /4 / 8
MUX
MUX_OUT
LD
CP_OUT
CP_GND
TUNE
RFOUTA_P
RFOUTA_N
RFOUT_EN
RFOUTB_P
RFOUTB_N
For pricing, delivery, and ordering information, please contact Maxim Direct
at 1-888-629-4642, or visit Maxim’s website at www.maximintegrated.com.
19-6250; Rev 5; 3/14

1 page




MAX2870 pdf
MAX2870
23.5MHz to 6000MHz Fractional/
Integer-N Synthesizer/VCO
Typical Operating Characteristics
(Measured with MAX2870 EV Kit. VCC_ = 3.3V, VGND_ = 0V, fREF_IN = 50MHz, TA = +25°C, see the Testing Conditions Table.)
3.0GHz VCO OPEN-LOOP PHASE NOISE
vs. FREQUENCY
-40
-50
-60
-70
-80
-90
-100
-110
-120
-130
-140
-150
-160
1
10 100 1k 10k 100k
FREQUENCY (kHz)
4.5GHz VCO OPEN-LOOP PHASE NOISE
vs. FREQUENCY
-40
-50
-60
-70
-80
-90
-100
-110
-120
-130
-140
-150
-160
1
10 100 1k 10k 100k
FREQUENCY (kHz)
6.0GHz VCO OPEN-LOOP PHASE NOISE
vs. FREQUENCY
-40
-50
-60
-70
-80
-90
-100
-110
-120
-130
-140
-150
-160
1
10 100 1k 10k 100k
FREQUENCY (kHz)
3.0GHz CLOSED-LOOP PHASE NOISE
vs. FREQUENCY
-70
-80 DIV1
DIV2
-90 DIV4
-100 DIV8
-110
DIV16
DIV32
-120 DIV64
-130 DIV128
-140
-150
-160
-170
1
10 100 1k 10k
FREQUENCY (kHz)
100k
4.5GHz CLOSED-LOOP PHASE NOISE
vs. FREQUENCY
-70
-80 DIV1
DIV2
-90 DIV4
-100 DIV8
-110
DIV16
DIV32
-120 DIV64
-130 DIV128
-140
-150
-160
-170
1
10 100 1k 10k
FREQUENCY (kHz)
100k
6.0GHz CLOSED-LOOP PHASE NOISE
vs. FREQUENCY
-70
-80 DIV1
DIV2
-90 DIV4
-100 DIV8
-110
DIV16
DIV32
-120 DIV64
-130 DIV128
-140
-150
-160
-170
1
10 100 1k 10k
FREQUENCY (kHz)
100k
904MHz INTEGER-N MODE PHASE NOISE
AND SPUR PERFOMANCE vs. FREQUENCY
0
-20
-40
-60
-80
-100
-120
-140
-160
1
10 100 1k
FREQUENCY (kHz)
10k
2687.5MHz INTEGER-N MODE PHASE NOISE
AND SPUR PERFOMANCE vs. FREQUENCY
0
-20
-40
-60
-80
-100
-120
-140
-160
1
10 100 1k
FREQUENCY (kHz)
10k
2113.5MHz FRACTIONAL-N PHASE NOISE
(LOW-NOISE MODE) vs. FREQUENCY
-70
-80
-90
-100
-110
-120
-130
-140
-150
-160
-170
1
10 100 1k
FREQUENCY (kHz)
10k
Maxim Integrated
  5

5 Page





MAX2870 arduino
MAX2870
23.5MHz to 6000MHz Fractional/
Integer-N Synthesizer/VCO
Pin Description (continued)
PIN NAME
FUNCTION
14 RFOUTB_P Open Collector Positive RF Output B. Connect to supply through RF choke or 50I load.
15 RFOUTB_N Open Collector Negative RF Output B. Connect to supply through RF choke or 50I load.
16
VCC_RF
Power Supply for RF Output and Dividers. Place decoupling capacitors as close as possible
to the pin.
17
VCC_VCO
VCO Power Supply. Place decoupling capacitors to the analog ground plane.
18 GND_VCO Ground for VCO. Connect to main board ground plane, not directly to the paddle.
19 NOISE_FILT VCO Noise Decoupling. Place a 1FF capacitor to ground.
20
TUNE
Control Input to the VCO. Connect to external loop filter.
21
GND_TUNE
Ground for Control Input to the VCO. Connect to main board ground plane, not directly to the
paddle.
22
RSET
Charge-Pump Current Range Input. Connect an external resistor to ground to set the minimum
CP current. ICP = 1.63/RSET x (1 + CP)
23 BIAS_FILT VCO Noise Decoupling. Place a 1FF capacitor to ground.
24
REG
Reference Voltage Compensation. Place a 1FF capacitor to ground.
25
LD
Lock Detect Output. Logic-high when locked, and logic-low when unlocked. See register
description for more details (Table 9).
26 RFOUT_EN RF Output Enable. A logic-low disables the RF outputs.
27
GND_DIG
Ground for Digital circuitry. Connect to main board ground plane, not directly to the paddle.
28
VCC_DIG
Power Supply for Digital Circuitry. Place decoupling capacitors as close as possible to pin.
29
REF_IN
Reference Frequency Input. This is a high-impedance input with a nominal bias voltage of
VCC_DIG/2. AC-couple to reference signal.
30 MUX_OUT Multiplexed Output and Serial Data Out. See Table 6.
31
GND_SD
Ground for Sigma-Delta Modulator. Connect to main board ground plane, not directly to
the paddle.
32
VCC_SD
Power Supply for Sigma-Delta Modulator. Place decoupling capacitors as close as possible
to the pin.
— EP Exposed Pad. Connect to board ground.
Maxim Integrated
  11

11 Page







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