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參數(shù)資料
| 型號(hào)： | ADF4106BRU |
| 廠商： | Analog Devices, Inc. |
| 元件分類： | XO, clock |
| 英文描述： | PLL Frequency Synthesizer |
| 中文描述： | PLL頻率合成器 |
| 封裝： | MO-153AB, TSSOP-16 |
| 文件頁數(shù)： | 8/20頁 |
| 文件大?。?/td> | 228K |
| 代理商： | ADF4106BRU |
REV. 0
ADF4106
–8–
PRESCALER OUTPUT FREQUENCY
3.5
3.0
050
300
100
D
D
–
150
200
250
2.0
1.5
1.0
0.5
2.5
V
DD
= 3V
V
P
= 3V
TPC 13. DI
DD
vs. Prescaler Output Frequency
V
CP
–
V
6
0
–
6
0
5.0
0.5
I
C
–
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
4
2
–
2
–
4
V
P
= 5V
I
CP
= 5mA
TPC 14. Charge Pump Output Characteristics
CIRCUIT DESCRIPTION
REFERENCE INPUT SECTION
The Reference Input stage is shown in Figure 2. SW1 and SW2
are normally-closed switches. SW3 is normally-open. When
Powerdown is initiated, SW3 is closed and SW1 and SW2 are
opened. This ensures that there is no loading of the REF
IN
pin
on power-down.
POWER-DOWN
CONTROL
100k
NC
REF
IN
NC
NO
SW1
SW2
SW3
BUFFER
TO R COUNTER
NC = NO CONNECT
Figure 2. Reference Input Stage
RF INPUT STAGE
The RF input stage is shown in Figure 3. It is followed by a 2-stage
limiting amplifier to generate the CML clock levels needed for the
prescaler.
AV
DD
500
1.6V
RF
IN
A
RF
IN
B
500
AGND
BIAS
GENERATOR
Figure 3. RF 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 RF input stage and divides it
down to a manageable frequency for the CMOS A and B
counters. The prescaler is programmable. It can be set in soft-
ware to 8/9, 16/17, 32/33 or 64/65. It 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: (P
2
–
P).
A AND B COUNTERS
The A and B CMOS counters combine with the dual modulus
prescaler to allow a wide ranging 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 an RF input
frequency of 4.0 GHz, a prescaler value of 16/17 is valid but a
value of 8/9 is not valid.
Pulse Swallow Function
The A and B counters, in conjunction with the dual modulus
prescaler make it possible to generate output frequencies which
are spaced only by the Reference Frequency divided by R. The
equation for the VCO frequency is as follows:
f
P
B
A
f
R
VCO
REFIN
=
×
+
×
[(
)
]
f
VCO
Output Frequency of external voltage controlled
oscillator (VCO).
Preset modulus of dual modulus prescaler
(8/9, 16/17, etc.,).
Preset Divide Ratio of binary 13-bit counter
(3 to 8191).
Preset Divide Ratio of binary 6-bit swallow
counter (0 to 63).
External reference frequency oscillator.
P
B
A
f
REFIN
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