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參數(shù)資料
| 型號(hào)： | AD9864-EB |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | IF Digitizing Subsystem |
| 中文描述： | 中頻數(shù)字化子系統(tǒng) |
| 文件頁(yè)數(shù)： | 38/44頁(yè) |
| 文件大小： | 1984K |
| 代理商： | AD9864-EB |
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AD9864
The LO, CLK, and IFIN signals are coupled to their respective
inputs using 10 nF capacitors. The output of the mixer is cou-
pled to the input of the ADC using 100 pF. An external 100 k
resistor from the RREF pin to GND sets up the AD9864’s
internal bias currents. VREFP and VREFN provide a differen-
tial reference voltage to the AD9864’s Σ- ADC and must be
decoupled by a 0.01 μF differential capacitor along with two
100 pF capacitors to GND. The remaining capacitors are used
to decouple other sensitive internal nodes to GND.
Although power supply decoupling capacitors are not shown, it
is recommended that a 0.1 μF surface-mount capacitor be
placed as close as possible to each power supply pin for maxi-
mum effectiveness. Also not shown is the input impedance
matching network used to match the AD9864’s IF input to the
external IF filter. Lastly, the loop filter components associated
with the LO and CLK synthesizers are not shown.
LC component values for
f
CLK
= 18 MHz are given Figure 70.
For other clock frequencies, the two inductors and the capaci-
tor of the LC tank should be scaled in inverse proportion to the
clock. For example, if
f
CLK
= 26 MHz, the two inductors should
be = 6.9 μH and the capacitor should be about 120 pF. A toler-
ance of 10% is sufficient for these components since tuning of
the LC tank is performed upon system startup.
APPLICATIONS
SuperHeterodyne Receiver Example
The AD9864 is well suited for analog and/or digital narrow-band
radio systems based on a superheterodyne receiver architecture. The
superheterodyne architecture is noted for achieving exceptional
dynamic range and selectivity by using two or more downconversion
stages to provide amplification of the target signal while filtering the
undesired signals. The AD9864 greatly simplifies the design of these
radio systems by integrating the complete IF strip (excluding the LO
VCO) while providing an I/Q digital output (along with other sys-
tem parameters) for the demodulation of both analog and digital
modulated signals. The AD9864’s exceptional dynamic range often
simplifies the IF filtering requirements and eliminates the need for an
external AGC.
RF
INPUT
PRESELECT
FILTER
TUNER
IF CRYSTAL OR
SAW FILTER
VDDA
Σ
-
ADC
LNA
VCO
ADF42xx
PLL SYN
REFIN
TO
DSP
AD9864
DECIMATION
FILTER
SAMPLE CLOCK
SYNTHESIZER
I
LOOP
FILTER
L
L
VCO
LOOP
FILTER
VDDC
I
C
C
FROM DSP
LO
SYNTH.
VOLTAGE
REFERENCE
SPI
R
V
V
S
P
P
P
CRYSTAL
OSCILLATOR
IFIN
–16dB
LNA
V
V
I
I
DAC AGC
FORMATTING/SSI
DOUTA
DOUTB
FS
CLKOUT
CONTROL LOGIC
G
G
IF2 =
f
CLK
/8
0
Figure 71. Typical Dual Conversion Superheterodyne Application Using the AD9864
Rev. 0 | Page 38 of 44
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