LMX2615-SP
www.ti.com.cn
ZHCSIC4C –JUNE 2018–REVISED NOVEMBER 2018
Pin Functions
CQFP Package (QFN) Pin Functions
PIN
I/O
TYPE
DESCRIPTION
NO.
1
NAME
NC
—
—
I
—
—
—
—
No connection. Pin may be grounded or left unconnected.
No connection. Pin may be grounded or left unconnected.
Parallel pin control. This is the LSB.
2
NC
3
FS0
FS1
4
I
Parallel pin control
Chip enable. In Pin Mode (not SPI Mode), rising edges presented to this pin activate
the VCO calibration.
5
CAL
I
—
6
GND
VbiasVCO
GND
—
—
—
I
—
—
—
—
—
—
Ground
7
VCO bias. Requires connecting 10uF capacitor to ground. Place close to pin.
8
Ground
9
SYNC
Phase synchronization input pin.
10
11
GND
—
—
Ground
VccDIG
Digital supply. Recommend connecting 0.1uF capacitor to ground.
Complimentary Reference input clock pins. High input impedance. Requires connecting
series capacitor (0.1 uF recommended).
12
13
14
OSCinP
OSCinM
VregIN
I
I
—
—
—
Complimentary pin to OSCinP.
Input reference path regulator decoupling. Requires connecting 1uF capacitor to
ground. Place close to pin.
—
15
16
17
18
19
FS2
FS3
FS4
FS5
FS6
I
I
I
I
I
—
—
—
—
—
Parallel pin control
Parallel pin control
Parallel pin control
Parallel pin control
Parallel pin control
Parallel pin control. This is the MSB. Controls output state in pin mode. When this pin
is low, only RFoutA is active, otherwise both outputs are active.
20
21
22
FS7
I
—
—
—
VccCP
CPout
—
O
Charge pump supply. Recommend connecting 0.1uF capacitor to ground.
Charge pump output. Recommend connecting C1 of loop filter close to charge pump
pin.
23
24
25
26
27
28
29
GND
GND
—
—
—
I
Ground
Ground
—
Ground
Ground
VccMASH
SCK
Digital supply. Recommend connecting 0.1uF and 10uF capacitor to ground.
SPI input clock. High impedance CMOS input. 1.8 – 3.3V logic.
SPI input data. High impedance CMOS input. 1.8 – 3.3V logic.
Ground
—
SDI
I
—
GND
—
O
Ground
—
RFoutBM
Complementary pin for RFoutBP
Differential output B Pair. Requires connecting a 50-Ω resistor pull-up to Vcc as close
as possible to pin. Can be used as a synthesizer output or SYSREF output.
30
RFoutBP
O
—
31
32
33
34
35
36
GND
MUXout
NC
—
O
Ground
—
Ground
Multiplexed output pin. Can output: lock detect, SPI readback and diagnostics.
No connection. Leave Unconnected
—
—
—
O
—
VccBUF
GND
—
Output buffer supply. Requires connecting 0.1uF capacitor to ground.
Ground
Ground
—
RFoutAM
Complementary pin for RFoutAP
Differential output B Pair. Requires connecting a 50-Ω resistor pull-up to Vcc as close
as possible to pin.
37
RFoutAP
O
—
38
39
40
GND
CSB
GND
—
I
Ground
—
Ground
SPI chip select bar. High impedance CMOS input. 1.8 – 3.3V logic.
Ground
—
Ground
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