ADF4213BRU-REEL7 Analog Devices Inc, ADF4213BRU-REEL7 Datasheet - Page 17

• Manufacturer Part Number: ADF4213BRU-REEL7
• Description: IC PLL FREQ SYNTHESIZER 20-TSSOP
• Manufacturer: Analog Devices Inc
• Type: Clock/Frequency Synthesizer (RF/IF)r

Specifications of ADF4213BRU-REEL7

• Rohs Status: RoHS non-compliant
• Pll: Yes
• Input: CMOS
• Output: Clock
• Number Of Circuits: 1
• Ratio - Input:output: 3:1
• Differential - Input:output: Yes/No
• Frequency - Max: 3GHz
• Divider/multiplier: No/No
• Voltage - Supply: 2.7 V ~ 5.5 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 20-TSSOP
• Frequency-max: 3GHz

RF PROGRAM MODES
Table III and Table V show how to set up the Program Modes
in the ADF421x family.
RF Charge Pump Currents
RFCP2, RFCP1, RFCP0 program current setting for the RF
charge pump. See Table V.
PROGRAMMABLE RF N COUNTER
If control bits C2, C1 are 1, 1, the data in the input register is
used to program the RF N (A + B) counter. The N counter
consists of a 6-bit swallow counter (A Counter) and 12-bit
programmable counter (B Counter). Table IV shows the input
register data format for programming the RF N counter and the
possible divide ratios.
RF Prescaler Value
P14 and P15 in the RF A, B Counter Latch sets the RF pres-
caler value. See Table VI.
RF Power-Down
Table III and Table V show the power-down bits in the
ADF421x family.
RF Fastlock
The RF CP Gain bit (P17) of the RF N register in the ADF421x
family is the Fastlock Enable Bit. Only when this is “1” is IF
Fastlock enabled. When Fastlock is enabled, the RF CP current
is set to its maximum value. Also an extra loop filter damping
resistor to ground is switched in using the FL
pensating for the change in loop characteristics while in Fastlock.
Since the RF CP Gain bit is contained in the RF N Counter, only
one write is needed to both program a new output frequency and
also initiate Fastlock. To come out of Fastlock, the RF CP Gain bit
on the RF N register must be set to “0.” See Table VI.
IF
OUT
18
18
100pF
18
DECOUPLING CAPACITORS (22 F/10PF) ON V
ADF4211/ADF4212/ADF4213 AND ON V
BEEN OMITTED FROM THE DIAGRAM TO AID CLARITY.
100pF
51
VCO190-
540T
V
CC
100pF
FREF
620pF
IN
3.3k
8.2nF
5.6k
1000pF
51
O
2.7k
CC
pin, thus com-
1000pF
OF THE VCOS HAVE
1.3nF
DD
, V
CP
R
RF
SET
V
P
IN
V
IF
P
OF THE
P
2
B
ADF4210/
ADF4211/
ADF4212/
ADF4213
V
V
DD
DD
2 V
REF
ADF4210/ADF4211/ADF4212/ADF4213
APPLICATIONS SECTION
Local Oscillator for GSM Handset Receiver
Figure 7 shows the ADF4210/ADF4211/ADF4212/ADF4213
being used with a VCO to produce the LO for a GSM base
station transmitter.
The reference input signal is applied to the circuit at FREF
and, in this case, is terminated in 50 Ω. A typical GSM system
would have a 13 MHz TCXO driving the reference input with-
out any 50 Ω termination. In order to have a channel spacing of
200 kHz (the GSM standard), the reference input must be
divided by 65, using the on-chip reference.
WIDEBAND PLL
Many of the wireless applications for synthesizers and VCOs in
PLLs are narrowband in nature. These applications include
various wireless standards such as GSM, DSC1800, CDMA, or
WCDMA. In each of these cases, the total tuning range for the
local oscillator is less than 100 MHz. However, there are also
wideband applications where the local oscillator could have up
to an octave tuning range. For example, cable TV tuners have
a total range of about 400 MHz. Figure 8 shows an applica-
tion where the ADF4213 is used to control and program the
Micronetics M3500–1324. The loop filter was designed for an
RF output of 2100 MHz, a loop bandwidth of 40 kHz, a PFD
frequency of 1 MHz, I
multiplied by the gain factor of 4), VCO K
sitivity of the M3500–1324 at an output of 2100 MHz) and a
phase margin of 45°C.
In narrowband applications, there is generally a small variation
(less than 10%) in output frequency and also a small variation
(typically < 10%) in VCO sensitivity over the range. However,
DD
IN
1
MUXOUT
DATA
CP
V
RF
CLK
V
P
LE
P
RF
1
IN
1.3nF
LOCK
DETECT
3.3k
5.6k
8.2nF
100pF
CP
of 10 mA (2.5 mA synthesizer I
620pF
VCO190-
51
902T
V
CC
100pF
D
100pF
18
of 80 MHz/V (sen-
18
18
RF
OUT
CP
IN