参数资料
型号: TLE7719-T
厂商: INFINEON TECHNOLOGIES AG
元件分类: 模拟信号调理
英文描述: SPECIALTY ANALOG CIRCUIT, PDSO28
封装: PLASTIC, TSSOP-28
文件页数: 19/75页
文件大小: 1485K
代理商: TLE7719-T
TLE7719-T
Functional Block Description
Data Sheet
26
V1.1, 2004-09-13
Figure 6
Satellite Receiver Channel
3.2.1
Analog decoding of satellite signals
3.2.1.1
General signal conditioning
The external satellite communicates to the receiver by modulating its current
consumption at LINEx (x = 1 … 4). In order to ensure a constant threshold value of the
modulation current, the idle (base) current consumption of the sensor is measured,
integrated and afterwards subtracted from the line current. Therefore a constant
threshold current value for detecting high and low level signals can be provided over a
wide base current range.
6 Bit
up/down
Counter
&
Leakage
Detector
R
S2
400
- +
R
S1
2
GND
I
BASE
I
BASE
6 Bit Current DAC
I
REF
VC5
-
+
-
+
I
TH
Current Generator
I
REF
VC5
Resistor Network
L=down
H=up
Leakage
to GND
Leakage
to supply
voltage
RxD
Difference
Detector
R
2 x R
ILINE/
200
proportional
to 12,5mA
on pin SATx
x y
1 27
2 2
3 13
4 16
6 Bit
Clock signal frequency for
sampling the LINEx current
LOW
f
Sample / 4
f
Sample / 256
Clock signal frequency for
sampling the LINEx current
HIGH
To digital receiver
block and LINELx
monitoring output
Gate
Driver
LINEx
28
BOOST12
Voltage for
Synchr. Pulse
Satellite Supply
Voltage
1
SLINE12
Current
Limitation
15
BOOST34
14
SLINE34
Active Diode
circuit
Power
D-
M
O
S
Regulator
Control
Power
Switch
y
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