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參數資料
| 型號： | AD8309ARU |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 運動控制電子 |
| 英文描述： | 5 MHz.500 MHz 100 dB Demodulating Logarithmic Amplifier with Limiter Output |
| 中文描述： | LOG OR ANTILOG AMPLIFIER, 495 MHz BAND WIDTH, PDSO16 |
| 封裝： | TSSOP-16 |
| 文件頁數： | 18/20頁 |
| 文件大?。?/td> | 311K |
| 代理商： | AD8309ARU |
REV. B
AD8309
–18–
Modulated Limiter Output
The limiter output stage of the AD8309 also provides an analog
multiplication capability: the amplitude of the output square
wave can be controlled by the current withdrawn from LMDR
(Pin 9). An analog control input of 0 V to +1 V is used to gener-
ate an exactly-proportional current of 0 mA to 10 mA in the npn
transistor, whose collector is held at a fixed voltage of
～
400 mV
by the internal bias in the AD8309. When the input signal is
above the limiting threshold, the output will then be a square-
wave whose amplitude is proportional to the control bias.
1
2
3
4
5
6
7
8
VLOG
VPS2
PADL
LMHI
LMLO
PADL
FLTR
LMDR
COM2
VPS1
PADL
INHI
INLO
PADL
COM1
ENBL
AD8309
9
10
11
14
15
16
10
V
10
V
12
13
V
S
1.8k
V
AD8031
0.1
m
F
RSSI
0.1
m
F
VARIABLE
OUTPUT
8.2k
V
0V TO +1V
18
V
0mA TO
10mA
2N3904
0.1
m
F
Figure 39. Variable Limiter Output Programming
Effect of Waveform Type on Intercept
The AD8309 fundamentally responds to voltage and not to
power. A direct consequence of this characteristic is that input
signals of equal rms power, but differing crest factors, will pro-
duce different results at the log amp’s output.
The effect of differing signal waveforms is to shift the effective
value of the log amp’s intercept. Graphically, this looks like a
vertical shift in the log amp’s transfer function. The device’s
logarithmic slope however is not affected. For example, consider
the case of the AD8309 being alternately fed by an unmodu-
lated sine wave and by a single CDMA channel of the same rms
power. The AD8309’s output voltage will differ by the equiva-
lent of 3.55 dB (71 mV) over the complete dynamic range of the
device (the output for a CDMA input being lower).
Table III shows the correction factors that should be applied to
measure the rms signal strength of a various signal types. A
sine
wave
input is used as a reference. To measure the rms power of
a square wave, for example, the mV equivalent of the dB value
given in the table (20 mV/dB times 3.01 dB) should be sub-
tracted from the output voltage of the AD8309.
Table III. Shift in AD8309 Output for Signals with Differing
Crest Factors
Correction Factor
(Add to Output Reading)
Signal Type
Sine Wave
Square Wave or DC
Triangular Wave
GSM Channel (All Time Slots On) +0.55 dB
CDMA Channel
PDC Channel (All Time Slots On) +0.58 dB
Gaussian Noise
0 dB
–3.01 dB
+0.9 dB
+3.55 dB
+2.51 dB
Evaluation Board
An evaluation board, carefully laid out and tested to demon-
strate the specified high speed performance of the AD8309 is
available. Figure 40 shows the schematic of the evaluation board
which fairly closely follows the basic connections schematic
shown in Figure 30. For ordering information, please refer to
the Ordering Guide. Links, switches and component settings for
different setups are described in Table IV.
1
2
3
4
5
6
7
8
VLOG
VPS2
PADL
LMHI
LMLO
PADL
FLTR
LMDR
COM2
VPS1
PADL
INHI
INLO
PADL
COM1
ENBL
AD8309
9
10
11
14
15
16
12
13
C3
0.1
m
F
R/L
52.3
V
C1
0.01
m
F
C2
0.01
m
F
R2
4.7
V
R1
0
V
+V
S
EXT
ENABLE
C7 (OPEN)
R6
402
V
C4
0.1
m
F
R7
402
V
R3
0
V
R5
4.7
V
R4
(OPEN)
V
RSSI
+V
S
L1
(OPEN)
C5
0.01
m
F
LMHI
C6
0.01
m
F
LMLO
LK1
R8
402
V
SIG
INHI
SIG
INLO
A
B
Figure 40. Evaluation Board Schematic
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