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LMX2335 Datasheet(PDF) 2 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Part No. LMX2335
Description  PLLatinum™ Dual Frequency Synthesizer for RF Personal Communications
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Maker  NSC [National Semiconductor (TI)]
Homepage  http://www.national.com
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LMX2335 Datasheet(HTML) 2 Page - National Semiconductor (TI)

 
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Connection Diagrams
Pin Descriptions
Pin No.
2335/37
Pin No.
2336
Pin
Name
I/O
Description
11
V
CC1
Power supply voltage input for RF1 analog and RF1 digital circuits. Input may range
from 2.7V to 5.5V. V
CC1 must equal VCC2. Bypass capacitors should be placed as
close as possible to this pin and be connected directly to the ground plane.
22
V
p1
Power supply for RF1 charge pump. Must be
≥ V
CC.
33
D
o1
O
RF1 charge pump output. For connection to a loop filter for driving the input of an
external VCO.
4
4
GND
LMX2335/37: Ground for RF1 analog and RF1 digital circuits. LMX2336: Ground for RF
digital circuitry.
55
f
IN1
I
First RF prescaler input. Small signal input from the VCO.
X6
f
IN1
I
RF1 prescaler complementary input. A bypass capacitor should be placed as close as
possible to this pin and be connected directly to the ground plane. Capacitor is optional
with loss of some sensitivity.
X
7
GND
Ground for RF1 analog circuitry.
6
8
OSC
in
I
Oscillator input. The input has a V
CC/2 input threshold and can be driven from an
external CMOS or TTL logic gate.
7
9
OSC
out
O
Oscillator output.
810
F
oLD
O
Multiplexed output of the programmable or reference dividers, lock detect signals and
Fastlock mode. CMOS output
(see Programmable Modes).
9
11
Clock
I
High impedance CMOS Clock input. Data for the various latches is clocked in on the
rising edge, into the 20-bit shift register.
10
12
Data
I
Binary serial data input. Data entered MSB first. The last two bits are the control bits.
High impedance CMOS input.
11
13
LE
I
Load enable high impedance CMOS input. When LE goes HIGH, data stored in the
shift registers is loaded into one of the 4 appropriate latches (control bit dependent).
X
14
GND
Ground for RF2 analog circuitry.
X15
f
IN2
I
RF2 prescaler complementary input. A bypass capacitor should be placed as close as
possible to this pin and be connected directly to the ground plane. Capacitor is optional
with loss of some sensitivity.
12
16
f
IN2
I
RF2 prescaler input. Small signal input from the VCO.
13
17
GND
LMX2335/37: Ground for RF2 analog, RF2 digital, MICROWIRE,F
oLD and Oscillator
circuits. LMX2336: Ground for RF2 digital, MICROWIRE, F
oLD and Oscillator circuits.
14
18
D
o2
O
RF2 charge pump output. For connection to a loop filter for driving the input of an
external VCO.
15
19
V
p2
Power supply for RF2 charge pump. Must be
≥ V
CC.
LMX2335/LMX2337
DS012332-2
Order Number LMX2335M/LMX2335TM or
LMX2337M/LMX2337TM
NS Package Number M16A and MTC16
LMX2336
DS012332-16
Order Number LMX2336TM
NS Package Number MTC20
www.national.com
2


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