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參數資料
| 型號： | U4314B |
| 英文描述： | Logarithmic AM Demodulator/RSSI |
| 中文描述： | 對數的AM解調器/接收信號強度指示 |
| 文件頁數： | 3/7頁 |
| 文件大小： | 73K |
| 代理商： | U4314B |
TELEFUNKEN Semiconductors
U4314B
Rev. A1: 26.06.1995
3 (7)
Electrical Characteristics
V
S
= 5 V, T
amb
= 25
°
C, f
in
= 10.7 MHz unless otherwise specified. Test circuit see figure 8. IF voltage levels are referred
to the input of the matching network and therefore approximately 5.6 dB higher than referred to Pin 5.
Parameters
Test Conditions / Pins
Symbol
Min.
Typ.
Max.
Unit
Characteristics
Supply voltage range
Supply current
Bandgap
Regulated voltage (without
external load)
Source resistance
Output current
External capacitor
Power supply rejection
ratio
IF amplifier
Input resistance
Input capacitance
–3 dB limiting point
Maximum AM input
voltage
AM
out
quiescent current
Maximum AM
out
current
Pin 8
Pin 8
V
S
I
S
3
12
1.25
V
0.8
mA
Pin 7
V
ref
2.3
2.4
2.5
V
Pin 7
Pin 7
Pin 7
Pin 7
R
ref
I
ref
C
ref
psrr
2
5
5
mA
F
dB
4.7
60
f = 50 Hz
Pin 5
Pin 5
Pin 5
Pin 5
R
in
C
in
V
IFin
V
IFinmax
200
330
5
36
96
650
pF
26
46
dB V
dB V
R
load
= 10 k
V
IFin
= 96 dB V,
R
load
= 10 k
Pin 4
I
AMout
I
AMoutmax
10
75
22
105
38
125
Pin 4
Circuit Description
General functions
The integrated circuit U4314B includes the following
functions: IF-amplifier, logarithmic RSSI / AM demodu-
lator and voltage-regulator.
The 10.7 MHz IF-signal from the front end passes the in-
tegrated IF-amplifier which operates to a logarithmic
RSSI / AM-demodulator. A logarithmic demodulator
was implemented to avoid settling time problems ef-
fected by use of an AGC. The temperature compensated
reference voltage of 2.4 V is externally available. The
value of the external blocking capacitor can be adapted to
the maximum expected load current out of the voltage
regulator. The total supply current is typically 0.8 mA
plus this load current.
95 10216
1, 2, 3, 6
Figure 3. Pin 1, 2, 3, 6 GND
7
95 10219
4
Figure 4. Pin 4 AM
out
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