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ADRF6701 데이터시트(PDF) 17 Page - Analog Devices

부품명 ADRF6701
상세설명  400 MHz to 1250 MHz Quadrature Modulator
PDF  36 Pages
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제조업체  AD [Analog Devices]
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ADRF6701 데이터시트(HTML) 17 Page - Analog Devices

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Data Sheet
ADRF6701
Rev. 0 | Page 17 of 36
MUX
RSET
NC
NOTES
1. NC = NO CONNECT. DO NOT CONNECT TO THIS PIN.
CP
VTUNE
LOSEL
LON
LOP
2:1
MUX
VCO
CORE
TEMP
SENSOR
DECL2
DECL1
DECL3
RFOUT
OPEN
BUFFER
BUFFER
–
+
CHARGE PUMP
250µA,
500µA (DEFAULT),
750µA,
1000µA
PRESCALER
÷2
MUXOUT
GND
REFIN
ADRF6701
5
8
36
11
7
4
20
15
23
21
25
24
30
28
35
31
PHASE
FREQUENCY
DETECTOR
THIRD-ORDER
FRACTIONAL
INTERPOLATOR
FRACTION
REG
MODULUS
INTEGER
REG
N COUNTER
21 TO 123
×2
÷2
÷4
DIVIDER
÷2
SPI
INTERFACE
DIVIDER
÷2
C43
10µF
(0603)
C14
22pF
(0603)
CP
TEST
POINT
(OPEN)
C13
6.8pF
(0603)
C40
22pF
(0603)
C3
100pF
(0402)
R3
OPEN
(0402)
VCC
VTUNE
OPEN
C15
2.7nF
(1206)
C2
OPEN
(0402)
C1
100pF
(0402)
R38
OPEN
(0402)
R37
0Ω
(0402)
R2
OPEN
(0402)
C42
10µF
(0603)
C17
0.1µF
(0402)
R63
OPEN
(0402)
R65 10kΩ
(0402)
R9 10kΩ
(0402)
R12
0Ω
(0402)
R10
3kΩ
(0603)
R62
0Ω
(0402)
R11
OPEN
(0402)
RFOUT
C16
100pF
(0402)
C41
OPEN
(0603)
C11
0.1µF
(0402)
C12
100pF
(0402)
R16
OPEN
(0402)
C29
100pF
(0402)
C5
100pF
(0402)
R39
10kΩ
(0402)
VCC
S1
R40
10kΩ
(0402)
C6
100pF
(0402)
R73
49.9Ω
(0402)
SEE TEXT
5
EXT LO
REF_IN
REFOUT OPEN
1
43
T3
MABA-007159
R20
0Ω
(0402)
R43
10kΩ
(0402)
S2
R47
10kΩ
(0402)
VDD
VDD
VDD
VDD
VDD
VDD
VDD
27
13 12
C9
0.1µF
(0402)
C10
100pF
(0402)
C27
0.1µF
(0402)
C26
100pF
(0402)
C25
0.1µF
(0402)
C24
100pF
(0402)
C23
0.1µF
(0402)
C22
100pF
(0402)
C20
0.1µF
(0402)
C21
100pF
(0402)
C19
0.1µF
(0402)
C18
100pF
(0402)
14
2
9
40
39
3
6
38
37
29
C7
0.1µF
(0402)
VCC
RED
+5V
C28
10µF
(3216)
C8
100pF
(0402)
34
22
17
10
1
QN
QP
÷2
0/90
IP
IN
QN
QP
IP
IN
18
19
32
33
26
R23
OPEN
(0402)
16
LE (USB)
DATA (USB)
CLK (USB)
Figure 35. Basic Connections for Operation (Loop Filter Set to 130 kHz)
LOOP FILTER
The loop filter is connected between the CP and VTUNE pins.
The return for the loop filter components should be to Pin 40
(DECL3). The loop filter design in Figure 35 results in a 3 dB
loop bandwidth of 130 kHz. The ADRF6701 closed loop phase
noise was also characterized using a 3.5 kHz loop filter design.
The recommended components for both filter designs are
shown in Table 8. For assistance in designing loop filters with
other characteristics, download the most recent revision of
ADIsimPLL™ from www.analog.com/adisimpll. Operation with
an external VCO is possible. In this case, the return for the loop
filter components is ground (assuming a ground reference on
the external VCO tuning input). The output of the loop filter is
connected to the external VCO’s tuning pin. The output of the
VCO is brought back into the device on the LOP and LON pins
(using a balun if necessary).
Table 8. Recommended Loop Filter Components
Component
130 kHz Loop Filter
3.5 kHz Loop Filter
C14
22 pF
0.1 μF
R10
3 kΩ
68 Ω
C15
2.7 nF
4.7 μF
R9
10 kΩ
270 Ω
C13
6.8 pF
47 nF
R65
10 kΩ
0 Ω
C40
22 pF
Open
R37
0 Ω
0 Ω
R11
Open
Open
R12
0 Ω
0 Ω



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