參數(shù)資料
型號(hào)： ADF4350BCPZ
廠商： Analog Devices Inc
文件頁(yè)數(shù)： 4/32頁(yè)
文件大?。?/td> 0K
描述： IC SYNTH PLL VCO FN/IN 32LFCSP
產(chǎn)品變化通告： ADF4350, ADF4905/6 N-counter Change 05/Mar/2012
設(shè)計(jì)資源： Broadband Low EVM Direct Conversion Transmitter (CN0134)
Broadband Low EVM Direct Conversion Transmitter Using LO Divide-by-2 Modulator (CN0144)
Using low noise linear drop-out regulators to power wideband PLL & VCO IC's (CN0147)
標(biāo)準(zhǔn)包裝： 1
類型： 扇出配送，分?jǐn)?shù)-N，整數(shù)-N，時(shí)鐘/頻率合成器（RF）
PLL： 是
輸入： CMOS，TTL
輸出： 時(shí)鐘
電路數(shù)： 1
比率 - 輸入:輸出： 1:3
差分 - 輸入:輸出： 無(wú)/無(wú)
頻率 - 最大： 4.4GHz
除法器/乘法器： 是/是
電源電壓： 3 V ~ 3.6 V
工作溫度： -40°C ~ 85°C
安裝類型： 表面貼裝
封裝/外殼： 32-VFQFN 裸露焊盤(pán)，CSP
供應(yīng)商設(shè)備封裝： 32-LFCSP-VQ（5x5）
包裝： 托盤(pán)
ADF4350
Rev. A | Page 12 of 32
MUXOUT AND LOCK DETECT
The output multiplexer on the ADF4350 allows the user
to access various internal points on the chip. The state of
MUXOUT is controlled by M3, M2, and M1 (for details,
see Figure 26). Figure 19 shows the MUXOUT section in
block diagram form.
DGND
DVDD
CONTROL
MUX
MUXOUT
ANALOG LOCK DETECT
DIGITAL LOCK DETECT
R COUNTER OUTPUT
N COUNTER OUTPUT
DGND
RESERVED
THREE-STATE OUTPUT
DVDD
Figure 19. MUXOUT Schematic
INPUT SHIFT REGISTERS
The ADF4350 digital section includes a 10–bit RF R counter,
a 16–bit RF N counter, a 12-bit FRAC counter, and a 12–bit
modulus counter. Data is clocked into the 32–bit shift register
on each rising edge of CLK. The data is clocked in MSB first.
Data is transferred from the shift register to one of six latches
on the rising edge of LE. The destination latch is determined by
the state of the three control bits (C3, C2, and C1) in the shift
register. These are the 3 LSBs, DB2, DB1, and DB0, as shown
in Figure 2. The truth table for these bits is shown in Table 5.
Figure 23 shows a summary of how the latches are programmed.
Table 5. C3, C2, and C1 Truth Table
Control Bits
C3
C2
C1
Register
0
Register 0 (R0)
0
1
Register 1 (R1)
0
1
0
Register 2 (R2)
0
1
Register 3 (R3)
1
0
Register 4 (R4)
1
0
1
Register 5 (R5)
PROGRAM MODES
Table 5 and Figure 23 through Figure 29 show how the program
modes are to be set up in the ADF4350.
A number of settings in the ADF4350 are double buffered.
These include the modulus value, phase value, R counter value,
reference doubler, reference divide-by-2, and current setting.
This means that two events have to occur before the part uses
a new value of any of the double buffered settings. First, the
new value is latched into the device by writing to the appropriate
register. Second, a new write must be performed on Register R0.
For example, any time the modulus value is updated, Register 0
(R0) must be written to, to ensure the modulus value is loaded
correctly. Divider select in Register 4 (R4) is also double buf-
fered, but only if DB13 of Register 2 (R2) is high.
VCO
The VCO core in the ADF4350 consists of three separate VCOs
each of which uses 16 overlapping bands, as shown in Figure 20,
to allow a wide frequency range to be covered without a large
VCO sensitivity (KV) and resultant poor phase noise and spu-
rious performance.
The correct VCO and band are chosen automatically by the
VCO and band select logic at power-up or whenever Register 0
(R0) is updated.
VCO and band selection take 10 PFD cycles × band select clock
divider value. The VCO VTUNE is disconnected from the output
of the loop filter and is connected to an internal reference voltage.
2.8
2.4
2.0
1.6
0.8
1.2
0.4
0
1800
2000
2200
2400
2600
2800
3000
3200
3400
3600
3800
4000
4200
4400
4600
07
32
5-
0
09
FREQUENCY (MHz)
V
TU
NE
(V
)
Figure 20. VTUNE vs. Frequency
The R counter output is used as the clock for the band select
logic. A programmable divider is provided at the R counter
output to allow division by 1 to 255 and is controlled by
Bits [BS8:BS1] in Register 4 (R4). When the required PFD
frequency is higher than 125 kHz, the divide ratio should be
set to allow enough time for correct band selection.
After band select, normal PLL action resumes. The nominal
value of KV is 33 MHz/V when the N-divider is driven from the
VCO output or this value divided by D. D is the output divider
value if the N-divider is driven from the RF divider output
(chosen by programming Bits [D12:D10] in Register 4 (R4).
The ADF4350 contains linearization circuitry to minimize
any variation of the product of ICP and KV to keep the loop
bandwidth constant.
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