ADF4157BRUZ-RL Analog Devices Inc, ADF4157BRUZ-RL Datasheet - Page 13

• Manufacturer Part Number: ADF4157BRUZ-RL
• Description: IC,FREQUENCY SYNTHESIZER,CMOS,TSSOP,16PIN,PLASTIC
• Manufacturer: Analog Devices Inc
• Type: Fractional N Synthesizer (RF)r

Specifications of ADF4157BRUZ-RL

• Pll: Yes
• Input: CMOS
• Output: Clock
• Number Of Circuits: 1
• Ratio - Input:output: 2:1
• Differential - Input:output: Yes/No
• Frequency - Max: 6GHz
• Divider/multiplier: Yes/Yes
• Voltage - Supply: 2.7 V ~ 3.3 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 16-TSSOP
• Frequency-max: 6GHz
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With: EVAL-ADF4157EB1Z - BOARD EVALUATION FOR ADF4157
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

LSB FRAC REGISTER (R1) MAP
With R1[2:0] set to 001, the on-chip LSB FRAC register is
programmed as shown in Figure 18.
13-Bit LSB FRAC Value
These 13 bits, along with Bits DB[14:3] in the INT/FRAC
register (R0), control what is loaded as the FRAC value into
the fractional interpolator. This is part of what determines
the overall feedback division factor. It is also used in Equation 1.
DB31
0
RESERVED
DB30 DB29 DB28 DB27 DB26 DB25 DB24 DB23 DB22 DB21 DB20 DB19 DB18 DB17 DB16 DB15 DB14 DB13 DB12 DB11 DB10 DB9 DB8 DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0
0
0
0
*THE FRAC VALUE IS MADE UP OF THE 12-BIT MSB STORED IN
REGISTER 0, AND THE 13-BIT LSB REGISTER STORED IN
REGISTER 1. FRAC VALUE = 13-BIT LSB + 12-BIT MSB × 2
F25
F13
0
0
0
0
1
1
1
1
.
.
.
F12
F24
0
0
0
0
1
1
1
1
.
.
.
F11
..........
..........
..........
..........
..........
..........
..........
..........
..........
..........
..........
..........
F10
13-BIT LSB FRACTIONAL VALUE
F9
F14
(FRAC) (DBB)
0
0
1
1
0
0
1
1
.
.
.
F8
F7
F13
0
1
0
1
0
1
0
1
.
.
.
F6
LSB FRACTIONAL VALUE
(FRAC)*
0
1
2
3
.
.
.
8188
8189
8190
8191
Figure 18. LSB FRAC Register (R1) Map
F5
F4
Rev. A | Page 13 of 24
F3
13
F2
.
F1
These 13 bits are the least significant bits of the 25-bit FRAC
value, and Bits DB[14:3] in the INT/FRAC register are the most
significant bits. See the RF Synthesizer: A Worked Example
section for more information.
Reserved Bits
All reserved bits should be set to 0 for normal operation.
0
0
0
0
0
RESERVED
0
0
0
0
0
0
0
C3(0) C2(0) C1(1)
CONTROL
BITS
ADF4157