- 您现在的位置：买卖IC网 > PDF目录8607 > AD8309ARUZ-REEL7 (Analog Devices Inc)IC AMP LOG DEMODULATING 16TSSOP PDF资料下载
参数资料
| 型号： | AD8309ARUZ-REEL7 |
| 厂商： | Analog Devices Inc |
| 文件页数： | 10/20页 |
| 文件大小： | 0K |
| 描述： | IC AMP LOG DEMODULATING 16TSSOP |
| 标准包装： | 1,000 |
| 类型： | 对数放大器 |
| 应用： | 接收器信号强度指示（RSSI） |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-TSSOP（0.173"，4.40mm 宽） |
| 供应商设备封装： | 16-TSSOP |
| 包装： | 带卷 (TR) |
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wave can be controlled by the current withdrawn from LMDR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
12
13
VS
1.8k
AD8031
0.1 F
RSSI
0.1 F
VARIABLE
OUTPUT
8.2k
0V TO +1V
18
0mA TO
10mA
2N3904
0.1 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
Signal Type
(Add to Output Reading)
Sine Wave
0 dB
Square Wave or DC
–3.01 dB
Triangular Wave
+0.9 dB
GSM Channel (All Time Slots On) +0.55 dB
CDMA Channel
+3.55 dB
PDC Channel (All Time Slots On) +0.58 dB
Gaussian Noise
+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 F
R/L
52.3
C1
0.01 F
C2
0.01 F
R2
4.7
R1
0
+VS
EXT
ENABLE
C7 (OPEN)
R6
402
C4
0.1 F
R7
402
R3
0
R5
4.7
R4
(OPEN)
VRSSI
+VS
L1
(OPEN)
C5
0.01 F
LMHI
C6
0.01 F
LMLO
LK1
R8
402
SIG
INHI
SIG
INLO
A
B
Figure 40. Evaluation Board Schematic
相关PDF资料 |
PDF描述 |
|---|---|
| 74LVC1G04FW4-7 | IC GATE INVERTER SGL DFN1010-6 |
| LTC2619IGN#PBF | IC DAC 14BIT R-R QUAD 16SSOP |
| AD8307AR-REEL7 | IC LOGARITHMIC AMP 8-SOIC |
| VI-242-IV-F4 | CONVERTER MOD DC/DC 15V 150W |
| VI-242-IV-F3 | CONVERTER MOD DC/DC 15V 150W |
相关代理商/技术参数 |
参数描述 |
|---|---|
| AD8309-EVAL | 制造商:Analog Devices 功能描述:AD8309 EVALUATION BOARD - Bulk |
| AD8309-EVALZ | 制造商:Analog Devices 功能描述:EVAL KIT FOR 5 MHZ-500 MHZ 100DB DEMODULATING LOGARITHMIC AM - Bulk 制造商:Analog Devices 功能描述:EVAL BOARD, AD8309 LOGARITHMIC AMPLIFIER, Silicon Manufacturer:Analog Devices, Silicon Core Number:AD8309, Kit Application Type:RF / IF, Kit Contents:Eval Board AD8309, Features:(Not Applicable) |
| AD830AN | 制造商:Analog Devices 功能描述:Video Amp Single 85MHz 制造商:Analog Devices 功能描述:IC AMP DIFF VIDEO DIP8 830 |
| AD830ANZ | 功能描述:IC VIDEO DIFF AMP HS 8-DIP RoHS:是 类别:集成电路 (IC) >> 线性 - 放大器 - 视频放大器和频缓冲器 系列:- 标准包装:1,000 系列:- 应用:驱动器 输出类型:差分 电路数:3 -3db带宽:350MHz 转换速率:1000 V/µs 电流 - 电源:14.5mA 电流 - 输出 / 通道:60mA 电压 - 电源，单路/双路(±):5 V ~ 12 V，±2.5 V ~ 6 V 安装类型:表面贴装 封装/外壳:20-VFQFN 裸露焊盘 供应商设备封装:20-QFN 裸露焊盘（4x4） 包装:带卷 (TR) |
| AD830AR | 功能描述:IC VIDEO DIFF AMP HS 8-SOIC RoHS:否 类别:集成电路 (IC) >> 线性 - 放大器 - 视频放大器和频缓冲器 系列:- 标准包装:1,000 系列:- 应用:驱动器 输出类型:差分 电路数:3 -3db带宽:350MHz 转换速率:1000 V/µs 电流 - 电源:14.5mA 电流 - 输出 / 通道:60mA 电压 - 电源，单路/双路(±):5 V ~ 12 V，±2.5 V ~ 6 V 安装类型:表面贴装 封装/外壳:20-VFQFN 裸露焊盘 供应商设备封装:20-QFN 裸露焊盘（4x4） 包装:带卷 (TR) |
发布紧急采购，3分钟左右您将得到回复。