參數(shù)資料
型號(hào)： TDA7528
廠商： STMICROELECTRONICS
元件分類： 消費(fèi)家電
英文描述： SPECIALTY CONSUMER CIRCUIT, PQFP64
封裝： 10 X 10 MM, 1.40 MM HEIGHT, ROHS COMPLIANT, LQFP-64
文件頁數(shù)： 26/65頁
文件大?。?/td> 610K
代理商： TDA7528
Electrical characteristics
TDA7528
Doc ID 13141 Rev 6
3.7.2
Reference oscillator / reference frequency input buffer
3.7.3
Divider
The mixer divider V is followed by a division-by-4-stage that generates 0°/90°/-90° LO
signals for the IMR mixer (90°/-90° mode to switch between upper or lower sideband
suppression in the IMR).
The main divider N can be operated in integer mode or in fractional mode. Three fraction
factors are programmable: 2, 3 and 6. A fractional compensation circuit is located at the
charge pump. The compensation acts for the low current only.
Table 18.
Reference oscillator / reference frequency input buffer electrical characteristics
Parameter
Test condition, comments
Min.
Typ
Max
Units
Reference oscillator mode – fundamental crystal
Oscillation frequency
Fundamental mode
-
74.1
-
MHz
Phase noise
@ 1 Hz
@ 10 Hz
@ 100 Hz
@ 1 kHz
@ 10 kHz
@ 100 kHz
@ 1 MHz
-
-20
-50
-80
-110
-130
< -130
-
dBc
Frequency stability
Degradation generated by the
oscillator
-20
-
20
ppm
Single ended input
Input frequency
-
75
MHz
Input voltage range
Single ended mode
200
-
1000
mVPP
Input impedance
Single ended mode
10
-
k
Ω
Reference frequency input buffer mode
reference input frequency
differential input
0.1
-
150
MHz
max input voltage high
-
1475
mV
min. input voltage low
-
925
-
mV
Input differential voltage
-
247
-
454
mV
Input offset voltage
-
1125
-
1275
mV
input impedance
-
150
-
k
Ω
Table 19.
Divider electrical characteristics
Symbol
Parameter
Test condition, comments
Min.
Typ
Max
Units
Mixer divider V – integer values
NV
Divider value divider_V
7 bit
5
-
131
-
Main divider N – fractional 2, 3 and 6 / integer divider
NN
Divider value divider_N
22bit (32/33 pre scaler)
1024
-
4194304
-
Reference divider R – integer values
NR
Divider value divider_R
16 bit
1
-
65535
-
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