LMX2512LQ0967 National Semiconductor, LMX2512LQ0967 Datasheet - Page 16

• Manufacturer Part Number: LMX2512LQ0967
• Description: IC FREQ SYNTH W/INT VCO 28LLP
• Manufacturer: National Semiconductor
• Series: PLLatinum™r
• Type: Frequency Synthesizer (RF/IF), Korean CDMA, Cellularr

Specifications of LMX2512LQ0967

• Output: LVCMOS
• Frequency - Max: 979MHz
• Voltage - Supply: 2.7 V ~ 3.3 V
• Operating Temperature: -30°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 28-LLP
• Frequency-max: 979MHz
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Input: -
• Other names: LMX2512LQ0967TR

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Programming Description
R4 REGISTER
The R4 register address bits (R3 [3:0]) are “0111”.
Register R4 is used to set the IF N counters if the default value is not desired. This register is only active if the SPI_DEF bit in
register R0 is 0.
IF Frequency Setting:
f
where
f
IF_B: Preset divide ratio of binary 9-bit programmable counter (1 ≤ IF_B ≤ 511)
IF_A: Preset divide ratio of binary 4-bit swallow counter (0 ≤ IF_A ≤ 15)
IF_R: Preset divide ratio of binary 9-bit programmable reference counter (2 ≤ IF_R ≤ 511)
f
VCO
VCO
OSC
R4
: Output frequency of IF voltage controlled oscillator (IF VCO)
: Reference oscillator frequency
= {16 x IF_B + IF_A} x f
MSB
23
0
22
0
21
0
Name
IF_A [3:0]
IF_B [8:0]
20
1
OSC
19
0
/ IF_R where (IF_A
18
0
17
0
(Continued)
16
SHIFT REGISTER BIT LOCATION
Data Field
15
IF_A
[3:0]
<
R4 REGISTER
IF_B)
14
16
13
12
11
Functions
IF A Counter
4-bit swallow counter
0 ≤ IF_A ≤ 15
IF B Counter
9-bit programmable counter
1 ≤ IF_B ≤ 511
10
9
IF_B
[8:0]
8
7
6
5
4
3
0
Address
2
1
Field
1
1
LSB
0
1