參數(shù)資料
型號： ACE9030
廠商： Mitel Networks Corporation
英文描述： Radio Interface and Twin Synthesiser
中文描述： 無線接口和雙合成器
文件頁數(shù)： 18/39頁
文件大?。?/td> 379K
代理商： ACE9030
18
ACE9030
DAC2
DAC2
CIN1
CIN2
1 nF
47 pF
C1
82 pF
C2
82 pF
D2
BB639
D1
BB535
VSSA
47 pF
100 pF
LO2
470
MIXER
LOAD
6 k8
TUNED CIRCUIT AT
HARMONIC, VALUES
GIVEN FOR 44.55 MHz
VDDA
ACE9030
220 nH
DRIVE
FROM
CRYSTAL
OSC.
5.6 pF
Crystal
14·85 MHz
15·36 MHz
Multiplier
x 3
x 5
LO2
1st I.F.
2nd I.F
.
44·55 MHz 45·00 MHz 450 kHz
76·80 MHz 77·25 MHz 450 kHz
Fig. 14 Crystal Oscillator Trimming Circuit with Typical
Component Values
Crystal Multiplier for LO2
To mix the first intermediate frequency signal down to the
second IF a second local oscillator is needed. In the ACE9030
there is a crystal frequency multiplier to generate this signal by
squaring the crystal oscillator waveform and selecting the
desired harmonic. To multiply the crystal frequency by 3 or 5
output LO2 is driven at the reference frequency with a 1:1 mark
space ratio. This ratio of 1:1 is chosen to minimise the even
harmonics, especially the second and fourth. A tuned circuit
will pick off the required harmonic. ACE9030 is specified with
the external components shown in Figure 15 giving 44.55 MHz
derived from 14.85 MHz crystal. The 6.8k
resistor and 5.6pF
capacitor represent the input impedance of a typical IF
amplifier LO input.
Typical performance for noise power measured in the
adjacent channels,16 kHz wide at 25 kHz offset is – 70 dBc.
To power down the multiplier if it is not required, a Normal
command can be used with DATA3 bit D6 set to LOW, to set
the multiplier power on DATA3 bit D6 should be set to HIGH:
Typical frequencies generated by the multiplier are:
Fig. 15 Basic Circuit of the Crystal Multiplier
Band-Gap Reference
A band-gap voltage reference is used to set levels in the
ADC, in the DAC’s and the currents in the synthesiser charge
pumps. This voltage is smoothed by an external decoupling
capacitor on the DECOUP pin.
The voltage derived for the ADC full range reference can
be monitored through pin DOUT8. The Radio Interface DAC
reference is nominally the same as the ADC reference and it
can be monitored independantly of DOUT8 by setting DAC3
(the low output impedance DAC) to full scale.
To power down the band-gap reference to allow the use
of an external reference voltage on pin DECOUP the following
Set-up command can be used:
where the band-gap is powered down if DATA3 bit D6 is LOW
or is active if DATA3 bit D6 is HIGH.
The band-gap voltage multiplier for the ADC and DAC
reference (nominally 3·45 V) can be adjusted by a Set-up
command to correct for production spreads:
DATA1
DDDDDDDD
DATA2
10xxxxxx
DATA3
xxx1xx00
DATA1
xxxxxxxx
DATA2
10 xxxxxx
DATA3
x D
6
xxxx00
DATA1
xxxxxxxx
DATA2
01xxxxxx
DATA3
x D
6
xxxxxx
where the value in DATA1, G
sets the gain from band-gap
to output voltage according to the approximate equation:
For a typical V
of 1·2 V the number is approximately 144
(= 90
) and for a typical V
of 1·3 V the number is approxi-
mately 70 (= 46
HEX
) and a suitable trimming pattern can be
chosen.
OUT
BG
(430 x G + 355 x 10
3
)
BG
(145 x 10
3
)
=
V
V
相關(guān)PDF資料
PDF描述
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
ACE9030IGFP1N 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Parallel-Input Frequency Synthesizer
ACE9030IGFP1R 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Parallel-Input Frequency Synthesizer
ACE9030IGFP2N 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Parallel-Input Frequency Synthesizer
ACE9030IGFP2R 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Parallel-Input Frequency Synthesizer
ACE9030M 制造商:MITEL 制造商全稱:Mitel Networks Corporation 功能描述:Radio Interface and Twin Synthesiser
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