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| 型號： | TDA8780M |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 運(yùn)動控制電子 |
| 英文描述： | True logarithmic amplifier |
| 中文描述： | LOG OR ANTILOG AMPLIFIER, 14 MHz BAND WIDTH, PDSO20 |
| 封裝： | 4.40 MM, PLASTIC, SOT-266-1, SSOP-20 |
| 文件頁數(shù)： | 9/16頁 |
| 文件大?。?/td> | 70K |
| 代理商： | TDA8780M |
1995 Jul 25
9
Philips Semiconductors
Product specification
True logarithmic amplifier
TDA8780M
APPLICATION INFORMATION
The circuit is typically connected as shown in Fig.6. The
single-ended 10.7 MHz input IF signal is applied
(arbitrarily) to one of the two input pins via a ceramic filter.
These inputs should not be DC coupled as this will disable
the on-chip feedback which sets the DC operating point of
the true logarithmic amplifier. The relatively high
impedance of these inputs facilitates correct termination of
the ceramic filter by an off-chip resistor.
The low-frequency cut-off point is determined by the value
of capacitors connected to pins 6 and 15 which decouple
the overall DC feedback and the value of the input coupling
capacitors. The output is coupled to an analog-to-digital
converter thus the value of the voltage fed to the reference
voltage input is not critical. It could be useful in other
applications, where the output may be DC coupled to an
alternative analog-to-digital converter, to derive this
reference voltage from the centre of the input resistor
chain of the analog-to-digital converter.
Fig.6 Typical application diagram.
handbook, full pagewidth
100 pF
100 pF
33 pF
56 pF
100 pF
56 pF
330
3.3 k
Rg
Clf
Clf
Vref
Vout
VP
CDEC1
CDEC2
Vin
Vin
GND1
Rg
IF input
IF filter 10.7 MHz
GND2
GND4
GND5
CE
TEST
GND3
2.5 V
circuit
enable
input
n.c.
n.c.
TDA8780M
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
5 V
47 nF
2.2 nF
output to
ADC
MGC117
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| TDA8781 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述: |
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| TDA8783HL | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:40 Msps, 10-bit analog-to-digital interface for CCD cameras |
| TDA8783HL/C4,118 | 功能描述:視頻模擬/數(shù)字化轉(zhuǎn)換器集成電路 10-BITS CCD 40MSPS 5V ADC RoHS:否 制造商:Texas Instruments 輸入信號類型:Differential 轉(zhuǎn)換器數(shù)量:1 ADC 輸入端數(shù)量:4 轉(zhuǎn)換速率:3 Gbps 分辨率:8 bit 結(jié)構(gòu): 輸入電壓:3.3 V 接口類型:SPI 信噪比: 電壓參考: 電源電壓-最大:3.45 V 電源電壓-最小:3.15 V 最大功率耗散: 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:TCSP-48 封裝:Reel |
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