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參數(shù)資料
| 型號： | EV-ADF4360-7EB1Z |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 2/28頁 |
| 文件大?。?/td> | 0K |
| 描述： | BOARD EVAL FOR ADF4360-7 |
| 標準包裝： | 1 |
| 主要目的： | 計時，頻率合成器 |
| 嵌入式： | 否 |
| 已用 IC / 零件： | ADF4360-7 |
| 主要屬性： | 帶 VCO 的單路整數(shù)-N PLL |
| 次要屬性： | 900MHz，200kHz PFD |
| 已供物品： | 板，纜線，CD |
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ADF4360-7
Data Sheet
Rev. D | Page 10 of 28
CIRCUIT DESCRIPTION
REFERENCE INPUT SECTION
The reference input stage is shown in Figure 16. SW1 and SW2
are normally closed switches. SW3 is normally open. When
power-down is initiated, SW3 is closed, and SW1 and SW2 are
opened. This ensures that there is no loading of the REFIN pin
on power-down.
04441-016
BUFFER
TO R COUNTER
REFIN
100k
NC
SW2
SW3
NO
NC
SW1
POWER-DOWN
CONTROL
Figure 16. Reference Input Stage
PRESCALER (P/P + 1)
The dual-modulus prescaler (P/P + 1), along with the A and B
counters, enables the large division ratio, N, to be realized
(N = BP + A). The dual-modulus prescaler, operating at CML
levels, takes the clock from the VCO and divides it down to a
manageable frequency for the CMOS A and B counters. The
prescaler is programmable. It can be set in software to 8/9,
16/17, or 32/33 and is based on a synchronous 4/5 core. There is
a minimum divide ratio possible for fully contiguous output
frequencies; this minimum is determined by P, the prescaler
value, and is given by (P2 P).
A AND B COUNTERS
The A and B CMOS counters combine with the dual-modulus
prescaler to allow a wide range division ratio in the PLL feed-
back counter. The counters are specified to work when the
prescaler output is 300 MHz or less. Thus, with a VCO
frequency of 2.5 GHz, a prescaler value of 16/17 is valid, but a
value of 8/9 is not valid. At fundamental VCO frequencies less
than 700 MHz, a value of 8/9 is best.
Pulse Swallow Function
The A and B counters, in conjunction with the dual-modulus
prescaler, make it possible to generate output frequencies that
are spaced only by the reference frequency divided by R. The
VCO frequency equation is
R
f
A
B
P
f
REFIN
VCO
/
]
[
where:
fVCO
is the output frequency of the VCO.
P
is the preset modulus of the dual-modulus prescaler
(8/9 or 16/17).
B
is the preset divide ratio of the binary 13-bit counter (3 to 8191).
A
is the preset divide ratio of the binary 5-bit swallow counter (0 to 31).
fREFIN
is the external reference frequency oscillator.
N = BP + A
TO PFD
FROM VCO
N DIVIDER
MODULUS
CONTROL
LOAD
13-BIT B
COUNTER
5-BIT A
COUNTER
PRESCALER
P/P+1
04441-017
Figure 17. A and B Counters
R COUNTER
The 14-bit R counter allows the input reference frequency to
be divided down to produce the reference clock to the phase
frequency detector (PFD). Division ratios from 1 to 16,383 are
allowed.
PFD AND CHARGE PUMP
The PFD takes inputs from the R counter and N counter
(N = BP + A) and produces an output proportional to the phase
and frequency difference between them. Figure 18 is a simpli-
fied schematic. The PFD includes a programmable delay ele-
ment that controls the width of the antibacklash pulse. This
pulse ensures that there is no dead zone in the PFD transfer
function and minimizes phase noise and reference spurs. Two
bits in the R counter latch, ABP2 and ABP1, control the width
of the pulse (see Table 9).
04441-
018
PROGRAMMABLE
DELAY
U3
CLR2
Q2
D2
U2
CLR1
Q1
D1
CHARGE
PUMP
DOWN
UP
HI
U1
ABP1
ABP2
R DIVIDER
N DIVIDER
CP OUTPUT
R DIVIDER
N DIVIDER
CP
CPGND
VP
Figure 18. PFD Simplified Schematic and Timing (In Lock)
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