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ADF7021 Datasheet(PDF) 48 Page - Analog Devices

Part # ADF7021
Description  High Performance Narrow-Band Transceiver IC
PDF  64 Pages
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Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

ADF7021 Datasheet(HTML) 48 Page - Analog Devices

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ADF7021
Data Sheet
Rev. B | Page 48 of 64
REGISTER 1—VCO/OSCILLATOR REGISTER
R3
R2
R1
RF R COUNTER
DIVIDE RATIO
0
0
.
.
.
1
1
2
.
.
.
7
1
0
.
.
.
1
0
1
.
.
.
1
X1 XTAL OSC
0
OFF
1
ON
VA2
VA1
VCO CENTER
FREQ ADJUST
0
NOMINAL
0
VCO ADJUST UP 1
1
VCO ADJUST UP 2
1
0
1
0
1
VCO ADJUST UP 3
D1
XTAL
DOUBLER
0
DISABLE
ENABLED
1
CP2
CP1
RSET
ICP (mA)
3.6k
Ω
0
0
0.3
0
1
0.9
1
0
1.5
1
1
2.1
VB4
VB3
VB2
VB1
VCO BIAS
CURRENT
0
0.25mA
0
0.5mA
.
1
1
0
.
1
0
1
.
1
0
0
.
1
3.75mA
CL4
CL3
CL2
CL1
CLKOUT
DIVIDE RATIO
0
OFF
0
0
.
.
.
1
0
1
0
.
.
.
1
2
4
.
.
.
0
0
1
.
.
.
1
0
0
0
.
.
.
1
30
VCO_BIAS
ADDRESS
BITS
XTAL_
BIAS
XB2 XB1
XTAL
BIAS
0
20µA
0
25µA
1
30µA
1
0
1
0
1
35µA
RFD1 RF DIVIDE BY 2
0
OFF
ON
1
LOOP
CONDITION
VCO OFF
VCO ON
VE1
0
1
VCO
INTERNAL L VCO
EXTERNAL L VCO
VCL1
0
1
R_COUNTER
CLOCKOUT_
DIVIDE
Figure 63. Register 1—VCO/Oscillator Register Map
The R_COUNTER and XTAL_DOUBLER relationship is
expressed as follows:
If XTAL_DOUBLER = 0,
COUNTER
R
XTAL
PFD
_
=
If XT
AL_DOUBLER =1,
COUNTER
R
XTAL
PFD
_
2
×
=
The CLOCKOUT_DIVIDE is a divided-down and inverted
version of the XTAL and is available on Pin 36 (CLKOUT).
Set XOSC_ENABLE high when using an external crystal. If
using an external oscillator (such as TCXO) with CMOS-level
outputs into Pin OSC2, set XOSC_ENABLE low. If using an
external oscillator with a 0.8 V p-p clipped sine wave output
into Pin OSC1, set XOSC_ENABLE high.
The VCO_BIAS bits should be set according to Table 9.
The VCO_ADJUST bits adjust the center of the VCO operating
band. Each bit typically adjusts the VCO band up by 1% of the
RF operating frequency (0.5% if RF_DIVIDE_BY_2 is enabled).
Setting VCO_INDUCTOR to external allows the use of the
external inductor VCO, which gives RF operating frequencies of
80 Hz to 650 MHz. If the internal inductor VCO is being used
for operation, set this bit low.



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