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ADF4157BRUZ-RL71 Arkusz danych(PDF) 6 Page - Analog Devices

Numer części ADF4157BRUZ-RL71
Szczegółowy opis  High Resolution 6 GHz Fractional-N Frequency Synthesizer
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ADF4157BRUZ-RL71 Arkusz danych(HTML) 6 Page - Analog Devices

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ADF4157
Rev. 0 | Page 6 of 20
PIN CONFIGURATIONS AND FUNCTION DESCRIPTIONS
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
CP
CPGND
AGND
AVDD
RFINA
RFINB
RSET
DVDD
MUXOUT
LE
CE
REFIN
DGND
CLK
DATA
VP
ADF4157
TOP VIEW
(Not to Scale)
PIN 1
INDICATOR
1
CPGND
2
AGND
3
AGND
4
RFINB
5
RFINA
13 DATA
14 LE
15 MUXOUT
12 CLK
11 CE
TOP VIEW
(Not to Scale)
ADF4157
Figure 3. TSSOP Pin Configuration
Figure 4. LFCSP Pin Configuration
Table 5. Pin Function Descriptions
TSSOP
LFCSP
Mnemonic
Description
1
19
RSET
Connecting a resistor between this pin and ground sets the maximum charge pump output current.
The relationship between ICP and RSET is
SET
CPMAX
R
I
5
.
25
=
where:
RSET = 5.1 kΩ.
ICPMAX = 5 mA.
2
20
CP
Charge Pump Output. When enabled, this provides ±ICP to the external loop filter which, in turn, drives
the external VCO.
3
1
CPGND
Charge Pump Ground. This is the ground return path for the charge pump.
4
2, 3
AGND
Analog Ground. This is the ground return path of the prescaler.
5
4
RFINB
Complementary Input to the RF Prescaler. This point should be decoupled to the ground plane with
a small bypass capacitor, typically 100 pF.
6
5
RFINA
Input to the RF Prescaler. This small-signal input is normally ac-coupled from the VCO.
7
6, 7
AVDD
Positive Power Supply for the RF Section. Decoupling capacitors to the digital ground plane should be
placed as close as possible to this pin. AVDD has a value of 3 V ± 10%. AVDD must have the same voltage as
DVDD.
8
8
REFIN
Reference Input. This is a CMOS input with a nominal threshold of VDD/2 and an equivalent input
resistance of 100 kΩ. This input can be driven from a TTL or CMOS crystal oscillator, or it can be ac-
coupled.
9
9, 10
DGND
Digital Ground.
10
11
CE
Chip Enable. A logic low on this pin powers down the device and puts the charge pump output into three-
state mode.
11
12
CLK
Serial Clock Input. This serial clock is used to clock in the serial data to the registers. The data is latched
into the shift register on the CLK rising edge. This input is a high impedance CMOS input.
12
13
DATA
Serial Data Input. The serial data is loaded MSB first with the three LSBs being the control bits. This input is
a high impedance CMOS input.
13
14
LE
Load Enable, CMOS Input. When LE is high, the data stored in the shift registers is loaded into one of
the five latches, the latch being selected using the control bits.
14
15
MUXOUT
This multiplexer output allows the lock detect, the scaled RF, or the scaled reference frequency to be
accessed externally.
15
16, 17
DVDD
Positive Power Supply for the Digital Section. Decoupling capacitors to the digital ground plane should be
placed as close as possible to this pin. DVDD has a value of 3 V ± 10%. DVDD must have the same voltage as
AVDD.
16
18
VP
Charge Pump Power Supply. This should be greater than or equal to VDD. In systems where VDD is 3 V, it can
be set to 5.5 V and used to drive a VCO with a tuning range of up to 5.5 V.


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