参数资料
| 型号： | AD8304ARU |
| 厂商： | Analog Devices Inc |
| 文件页数： | 8/20页 |
| 文件大小： | 0K |
| 描述： | IC LOGARITHM CONV 160DB 14-TSSOP |
| 设计资源： | Interfacing ADL5315 to Translinear Logarithmic Amplifier (CN0056) Interfacing ADL5317 High Side Current Mirror to a Translinear Logarithmic Amplifier in an Avalanche Photodiode Power Detector |
| 标准包装： | 1 |
| 类型： | 对数转换器 |
| 应用： | 光纤 |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 14-TSSOP（0.173"，4.40mm 宽） |
| 供应商设备封装： | 14-TSSOP |
| 包装： | 管件 |
REV. A
–16–
AD8304
6
3
4
PDB
BIAS
VREF
10
2
12
VPDB
VSUM
INPT
VSUM
5
1
VNEG
~10k
ACOM
14
VPS2
PWDN
VPS1
VREF
7
VLOG
8
BFIN
9
BFNG
TEMPERATURE
COMPENSATION
5k
11
VOUT
0.5V
IPD
NC
R1
750
C1
1nF
13
VP
NC = NO CONNECT
RB
VOUT
VN (–0.5V TO –3V)
10nF
VOFS
AD8304
Figure 15. Using the Buffer to Invert the Polarity
of the Slope
When the gain is set to 13 (RB = 5 k
) the 2 V VREF can be tied
directly to BFIN, in which case the starting point for the output
response is at 4 V. However, since the slope in this case is only
–0.2 V/decade, the full current range will only take the output
down by 1.6 V. Clearly, a higher slope (or gain) is desirable, in
which case VOFS should be set to a smaller voltage to avoid railing
the output at low currents. If VOFS = 1.2 V and G = 33, VOUT
now starts at 4.8 V and falls through this same voltage toward
ground with a slope of –0.6 V per decade, spanning the full
range of IPD.
Programmable Level Comparator with Hysteresis
The buffer amplifier and reference voltage permit a calibrated
level detector to be realized. Figure 16 shows the use of a 10-bit
MDAC to control the setpoint to within 0.1 dB of an exact value
over the 100 dB range of 1 nA
≤ I
PD
≤ 100 A when the full-
scale output of the MDAC is equal to that of its reference. The
2 V VREF also sets the minimum value of VSPT to 0.2 V, correspond-
ing to an input of 1 nA. Since 100 dB at the VLOG interface
corresponds to a 1 V span, the resistor network is calculated to
provide a maximum VSPT of 1.2 V while adding the required
10% of VREF.
In this example, the hysteresis range is arranged to be 0.1 dB,
(1 mV at VLOG) when using a 5 V supply. This will usually be
adequate to prevent noise that causes the comparator output to
thrash. That risk can be reduced further by using a low-pass filtering
capacitor at VLOG (shown dotted) to decrease the noise bandwidth.
6
3
4
PDB
BIAS
VREF
10
2
12
VPDB
VSUM
INPT
VSUM
5
1
VNEG
~10k
ACOM
14
VPS2
PWDN
VPS1
VREF
7
VLOG
8
BFIN
9
BFNG
TEMPERATURE
COMPENSATION
5k
11
VOUT
0.5V
IPD
NC
750
1nF
13
VP
NC = NO CONNECT
50M
VOUT
10nF
VSPT
VREF
VOUT
MDAC
49.9k
100k
RH
AD8304
Figure 16. Calibrated Level Comparator
6
3
4
PDB
BIAS
VREF
10
2
12
VPDB
VSUM
INPT
VSUM
5
1
VNEG
~10k
ACOM
14
VPS2
PWDN
VPS1
VREF
7
VLOG
8
BFIN
9
BFNG
TEMPERATURE
COMPENSATION
5k
11
VOUT
0.5V
ISRC
25k
NC
13
VP
NC = NO CONNECT
C2
1nF
VN (–0.5V TO –5V)
1k
VREF
VOUT
MDAC
C1
10nF
100k
AD8304
Figure 17. Multidecade Current Source
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相关代理商/技术参数 |
参数描述 |
|---|---|
| AD8304ARU-REEL | 制造商:Analog Devices 功能描述:SP Amp LOG Amp Single R-R O/P 5.5V 14-Pin TSSOP T/R 制造商:Analog Devices 功能描述:SP AMP LOG AMP SGL R-R O/P 5.5V 14TSSOP - Tape and Reel |
| AD8304ARU-REEL7 | 功能描述:IC LOGARITHMIC CONV 14-TSSOP T/R RoHS:否 类别:集成电路 (IC) >> 线性 - 放大器 - 专用 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:60 系列:- 类型:可变增益放大器 应用:CATV 安装类型:表面贴装 封装/外壳:20-WQFN 裸露焊盘 供应商设备封装:20-TQFN-EP（5x5） 包装:托盘 |
| AD8304ARUZ | 功能描述:IC LOGARITHM CONV 160DB 14-TSSOP RoHS:是 类别:集成电路 (IC) >> 线性 - 放大器 - 专用 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:60 系列:- 类型:可变增益放大器 应用:CATV 安装类型:表面贴装 封装/外壳:20-WQFN 裸露焊盘 供应商设备封装:20-TQFN-EP（5x5） 包装:托盘 |
| AD8304ARUZ | 制造商:Analog Devices 功能描述:Logarithmic Amplifier IC |
| AD8304ARUZ-RL7 | 功能描述:IC LOGARITHM CONV 160DB 14-TSSOP RoHS:是 类别:集成电路 (IC) >> 线性 - 放大器 - 专用 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:60 系列:- 类型:可变增益放大器 应用:CATV 安装类型:表面贴装 封装/外壳:20-WQFN 裸露焊盘 供应商设备封装:20-TQFN-EP（5x5） 包装:托盘 |
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