LMX2531LQE1226E/NOPB National Semiconductor, LMX2531LQE1226E/NOPB Datasheet - Page 4

• Manufacturer Part Number: LMX2531LQE1226E/NOPB
• Description: IC PLL FREQ SYNTH W/VCO 36-LLP
• Manufacturer: National Semiconductor
• Series: PowerWise®r
• Type: Clock/Frequency Synthesizer (RF)r

Specifications of LMX2531LQE1226E/NOPB

• Pll: Yes
• Input: Clock
• Output: CMOS
• Number Of Circuits: 1
• Ratio - Input:output: 2:2
• Differential - Input:output: No/No
• Frequency - Max: 1.268GHz
• Divider/multiplier: Yes/No
• Voltage - Supply: 2.8 V ~ 3.2 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 36-LLP
• Frequency-max: 1.268GHz
• For Use With: LMX25311226EVAL - BOARD EVAL FOR LMX25311226
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: LMX2531LQE1226ETR

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2,4,5,7,
12, 13,
29, 35
14, 15
Pin #
Pin Descriptions
10
11
16
17
18
19
20
21
22
23
24
25
26
27
28
30
31
32
33
34
36
1
3
6
8
9
Pin Name
VregPLL1
VregPLL2
VregVCO
VregBUF
VrefVCO
VccVCO
Ftest/LD
VregDIG
VccBUF
VccDIG
VccPLL
OSCin*
OSCin
DATA
CPout
Vtune
FLout
GND
GND
GND
GND
Fout
CLK
Test
NC
NC
CE
LE
I/O
O Buffered RF Output for the VCO.
O Charge pump output for PLL. For connection to Vtune through an external passive loop filter.
O An open drain NMOS output which is used for FastLock or a general purpose output.
O Multiplexed CMOS output. Typically used to monitor PLL lock condition.
O This pin is for test purposes and should be grounded for normal operation.
-
-
-
-
I
I
I
I
-
-
-
-
-
-
-
I
-
-
-
I
I
-
-
Power Supply for digital LDO circuitry. Input may range from 2.8 - 3.2 V. Bypass capacitors should be
placed as close as possible to this pin and ground.
Ground
No Connect.
Internally regulated voltage for the VCO buffer circuitry. Connect to ground with a capacitor.
MICROWIRE serial data input. High impedance CMOS input. This pin must not exceed 2.75V. Data is
clocked in MSB first. The last bits clocked in form the control or register select bits.
MICROWIRE clock input. High impedance CMOS input. This pin must not exceed 2.75V. Data is clocked
into the shift register on the rising edge.
MICROWIRE Latch Enable input. High impedance CMOS input. This pin must not exceed 2.75V. Data
stored in the shift register is loaded into the selected latch register when LE goes HIGH.
Chip Enable Input. High impedance CMOS input. This pin must not exceed 2.75V. When CE is brought
high the LMX2531 is powered up corresponding to the internal power control bits. Although the part can
be programmed when powered down, it is still necessary to reprogram the R0 register to get the part to
re-lock.
No Connect. Do NOT ground.
Power Supply for VCO regulator circuitry. Input may range from 2.8 - 3.2 V. Bypass capacitors should
be placed as close as possible to this pin and ground.
Internally regulated voltage for VCO circuitry. Not intended to drive an external load. Connect to ground
with a capacitor and some series resistance.
Internal reference voltage for VCO LDO. Not intended to drive an external load. Connect to ground with
a capacitor.
Ground for the VCO circuitry.
Ground for the VCO Output Buffer circuitry.
Power Supply for the VCO Buffer circuitry. Input may range from 2.8 - 3.2 V. Bypass capacitors should
be placed as close as possible to this pin and ground.
Tuning voltage input for the VCO. For connection to the CPout Pin through an external passive loop
filter.
Internally regulated voltage for PLL charge pump. Not intended to drive an external load. Connect to
ground with a capacitor.
Power Supply for the PLL. Input may range from 2.8 - 3.2 V. Bypass capacitors should be placed as
close as possible to this pin and ground.
Internally regulated voltage for RF digital circuitry. Not intended to drive an external load. Connect to
ground with a capacitor.
Oscillator input.
Oscillator complimentary input. When a single ended source is used, then a bypass capacitor should be
placed as close as possible to this pin and be connected to ground.
Ground
Internally regulated voltage for LDO digital circuitry.
4
Description