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AD608AR Scheda tecnica(PDF) 10 Page - Analog Devices

Il numero della parte AD608AR
Spiegazioni elettronici  Low Power Mixer/Limiter/RSSI 3 V Receiver IF Subsystem
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Produttore elettronici  AD [Analog Devices]
Homepage  http://www.analog.com
Logo AD - Analog Devices

AD608AR Scheda tecnica(HTML) 10 Page - Analog Devices

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REV. B
–10–
AD608
Applications
Figure 22 shows the AD608 configured for operation in a digital
system at a 10.7 MHz IF. The filter’s input and output imped-
ance are parallel terminated using 330
Ω resistors and the con-
version gain is 24 dB. The RF port is terminated in 50
Ω; in a
typical application the input would be matched to a SAW filter
using the impedance data shown previously in Table I.
Figure 23 shows the AD608 configured for narrowband FM op-
eration at a 450 kHz or 455 kHz with an external discriminator.
The IF filter has 1500
Ω input and output impedances— the
input is matched via a resistive divider and the output is termi-
nated in 1500
Ω. The discriminator requires 1 V p-p drive from
a 1 k
Ω source impedance, here provided by a gain-of-2.5 Class
A amplifier.
10.7MHz BPF Z = 330
R2
330
C5
0.1µF
R1
330
C2
100pF
C3
100pF
C4
100pF
C1
1µF
VPOS
LIMO
C6
10nF
SUPPLY
2.7V TO 5.5V
POWER-UP
3V CMOS
LIMITER
OUTPUT
VPOS –1V
±200mV
RSSI OUTPUT
+0.2V TO +1.8V
(20mV/dB)
LO INPUT
–16dBm
RF INPUT
–95dBm
TO
–15dBm
BIAS POINT
AT VPOS/2
IF BIAS POINT
DECOUPLING
BPF REVERSE
TERMINATION
OFFSET-CONTROL
LOOP FILTER
BPF
TERMINATION
C7
18nF
16
15
12
11
10
14
13
9
1
2
5
6
7
3
4
8
AD608
VPS1
COM1
RFHI
RFLO
MXOP
LOHI
COM2
VMID
PRUP
LMOP
COM3
RSSI
IFLO
VPS2
FDBK
IFHI
R3
100
R4
47k
R6
51.1
R5
51.1
Figure 22. Application at 10.7 MHz. The Bandpass Filter
Can Be a Toko Type SK107 or Murata Type SFE10.7
+5V
R1
51.1
C1 0.1µF
C2
1nF
GND
R2
51.1
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
AD608
VPS1
COM1
RFHI
RFLO
MXOP
LOHI
COM2
VMID
PRUP
LMOP
COM3
RSSI
IFLO
VPS2
FDBK
IFHI
R3
374
R4
1.5k
R6
1k
LOHI
RFHI
C3
1nF
R7
1130
F1
C7
0.1µF
C6 0.1µF
C8 0.1µF
C9
0.2µF
R5 200
C5 0.1µF
R14
8.66k
R15
24.9k
R13
402
R12
1k
CR1
CR2
R8
1k
R9
1k
C10
0.01µF
R11
3.3k
AUDIO
PRUP
RSSI
JUMPER
F1: TOKO HCFM2–455B
F2: MURATA CFY455S
CR1, CR2: 1N60
Q1: 2N3906
F2
R10
3.3k
R16
47k
Q1
C11
0.1µF
C4
1nF
Figure 23. Narrowband FM Application at 450 kHz or 455 kHz


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