Datasheet
PIN NAME FUNCTION
1 GND_CP Charge-Pump Ground. Connect to board ground, not to the paddle.
2 GND_SD Sigma Delta Modulator Ground. Connect to board ground, not to the paddle.
3 GND_PLL PLL Ground. Connect to board ground, not to the paddle.
4 RFINP Positive RF Input to Prescaler. AC ground through capacitor, if not used.
5 RFINN Negative RF Input to Prescaler. Connect to VCO output through coupling capacitor.
6 V
CC_PLL
PLL Power Supply. Place decoupling capacitors as close as possible to pin.
7 V
CC_REF
REF Power Supply. Place decoupling capacitors as close as possible to pin.
8 REF
Reference Frequency Input. This is a high-impedance input with a nominal bias voltage of
V
CC_REF
/2. AC-couple to reference signal.
9, 10 GND Ground. Connect to the board ground, not the paddle.
11 CE Chip Enable. A logic-low powers the device down.
12 CLK Serial Clock Input. The data is latched into the 32-bit shift register on the rising edge of the CLK line.
13 DATA Serial Data Input. The serial data is loaded MSB rst. The 3 LSBs identify the register address.
14 LE
Load Enable Input. When LE goes high the data stored in the shift register is loaded into the
appropriate register.
15 MUX
Multiplexed I/O. See Table 5.
16 V
CC_RF
RF Power Supply. Place decoupling capacitors as close as possible to pin.
17 V
CC_SD
Sigma Delta Modulator Power Supply. Place decoupling capacitors as close as possible to pin.
18 V
CP
Charge-Pump Power Supply. Place decoupling capacitors as close as possible to the pin.
19 RSET
Charge-Pump Current Range Input. Connect an external resistor to ground to set the minimum CP
current. I
CP
= 1.63/R
SET
x (1 + CP).
20 CP Charge-Pump Output. Connect to external loop lter input.
— EP Exposed Pad. Connect to board ground.
GND_SD
RFINN
GND_CP
LE
CLK
CE
MUX
V
CP
RSET
CP
GND
REF
V
CC_REF
V
CC_PLL
+
GND_PLL
DATA
V
CC_SD
GND
V
CC_RF
TQFN
4mm × 4mm
MAX2880
TOP VIEW
RFINP
10
9
8
7
6
111213
1415
54
3
21
16
17
18
19
20
EP
MAX2880 250MHz to 12.4GHz, High-Performance,
Fractional/Integer-N PLL
www.maximintegrated.com
Maxim Integrated
│
9
Pin Description
Pin Conguration