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