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參數(shù)資料
| 型號： | MAX3507 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | Upstream CATV Amplifier with On-Chip Anti-Alias Filter |
| 中文描述： | CATV上行放大器 |
| 文件頁數(shù)： | 7/12頁 |
| 文件大?。?/td> | 356K |
| 代理商： | MAX3507 |
Detailed Description
Internal Filter
The internal filter consists of an input transconductance
amplifier, a balanced fifth-order elliptic active lowpass
filter, and an offset-correction feedback network. The
signal at the output of the filter is level-shifted into the
programmable-gain amplifier.
The transconductance amplifier provides a high input
impedance to the user, and current drives the filter to
minimize insertion loss. The filter is a Gm-C topology to
provide sufficient bandwidth and linearity. The cutoff
frequency of the filter is fixed at 75MHz, while the spec-
ified stopband attenuation is met at 120MHz.
The internal offset-correction feedback network
removes any DC offset at the output of the filter. An off-
set voltage at this node would generate a transient dur-
ing a TX-enable or -disable transition, which would not
be acceptable. The offset-correction loop effectively
AC-couples the filter output to the programmable-gain
amplifier input. The network generates a highpass cor-
ner frequency at:
f
-3dB
(kHz) = 12.5/C(μF)
Specified performance is achieved when the input is
driven differentially. The MAX3507 may be driven sin-
gle-ended. To drive the device in this manner, one of
the input pins must be capacitively coupled to ground.
Use a capacitor whose value is large enough to allow
for a low-impedance path to ground at the lowest fre-
quency of operation. For operation down to 5MHz, a
0.001μF capacitor is suggested.
Programmable-Gain Amplifier
The programmable-gain amplifier (PGA) consists of the
variable-gain amplifier (VGA) and the digital-to-analog
converter (DAC), which provide better than 55dB of
output-level control in 0.5dB steps. The PGA is imple-
mented as a programmable Gilbert-cell attenuator. It
uses a differential architecture to achieve maximum lin-
earity. The gain of the PGA is determined by a 7-bit
M
Upstream CATV Amplifier with
On-Chip Anti-Alias Filter
_______________________________________________________________________________________
7
Pin Description
PIN
1
2
3
NAME
BIASF
DC+
DC-
GND
V
CC
IN+
IN-
CS
SDA
SCLK
N.C.
SHDN
CEXT
DESCRIPTION
Filter Bias. Connect to GND.
Filter Offset Correction. Connect 0.1μF capacitor between this pin and DC-.
Filter Offset Correction. Connect 0.1μF capacitor between this pin and DC+.
Ground
+5V Supply. Bypass this pin to GND with a 0.1μF capacitor as close to the part as possible.
Positive Input. Along with IN-, this port forms a high-impedance differential input to the filter.
Negative Input. When not used, this port must be AC-coupled to ground. See IN+.
Serial Interface Enable (Chip Select). TTL-compatible input. See
Serial Interface
section.
Serial Interface Data (Serial Data). TTL-compatible input. See
Serial Interface
section.
Serial Interface Clock (Serial Clock). TTL-compatible input. See
Serial Interface
section.
No Connection. Not internally connected.
Shutdown. When
SHDN
is set low, all functions (including the serial interface) are disabled.
RF Output Bypass. Bypass to ground with a 0.1μF capacitor.
4, 8, 12, 23, 26
5, 22, 25
6
7
9
10
11
13, 15, 17, 20, 24
14
16
18
OUT-
Negative Output. Along with OUT+, this port forms a 300
impedance output. This port is matched
to a 75
load using a 2:1 (voltage ratio) transformer.
Positive Output. See OUT-.
19
OUT+
21
TXEN
Signal Path Enable. Setting this pin low turns off the PGA and power amplifier, leaving the filter
and serial interface enabled to save the last gain setting.
27
EQ+
Positive Equalizer. Connect an RC network if equalization of the filter passband is desired; leave
open otherwise. See
Typical Operating Characteristics
.
28
EQ-
Negative Equalizer. Connect an RC network if equalization of the filter passband is desired; leave
open otherwise. See
Typical Operating Characteristics
.
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相關代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX3507EGI | 功能描述:射頻放大器 Upstream CATV Amplifier RoHS:否 制造商:Skyworks Solutions, Inc. 類型:Low Noise Amplifier 工作頻率:2.3 GHz to 2.8 GHz P1dB:18.5 dBm 輸出截獲點:37.5 dBm 功率增益類型:32 dB 噪聲系數(shù):0.85 dB 工作電源電壓:5 V 電源電流:125 mA 測試頻率:2.6 GHz 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:QFN-16 封裝:Reel |
| MAX3507EGI+ | 功能描述:射頻放大器 Upstream CATV Amplifier RoHS:否 制造商:Skyworks Solutions, Inc. 類型:Low Noise Amplifier 工作頻率:2.3 GHz to 2.8 GHz P1dB:18.5 dBm 輸出截獲點:37.5 dBm 功率增益類型:32 dB 噪聲系數(shù):0.85 dB 工作電源電壓:5 V 電源電流:125 mA 測試頻率:2.6 GHz 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:QFN-16 封裝:Reel |
| MAX3507EGI+T | 功能描述:射頻放大器 Upstream CATV Amplifier RoHS:否 制造商:Skyworks Solutions, Inc. 類型:Low Noise Amplifier 工作頻率:2.3 GHz to 2.8 GHz P1dB:18.5 dBm 輸出截獲點:37.5 dBm 功率增益類型:32 dB 噪聲系數(shù):0.85 dB 工作電源電壓:5 V 電源電流:125 mA 測試頻率:2.6 GHz 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:QFN-16 封裝:Reel |
| MAX3507EGI-T | 功能描述:射頻放大器 Upstream CATV Amplifier RoHS:否 制造商:Skyworks Solutions, Inc. 類型:Low Noise Amplifier 工作頻率:2.3 GHz to 2.8 GHz P1dB:18.5 dBm 輸出截獲點:37.5 dBm 功率增益類型:32 dB 噪聲系數(shù):0.85 dB 工作電源電壓:5 V 電源電流:125 mA 測試頻率:2.6 GHz 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:QFN-16 封裝:Reel |
| MAX3509EUP | 功能描述:射頻放大器 RoHS:否 制造商:Skyworks Solutions, Inc. 類型:Low Noise Amplifier 工作頻率:2.3 GHz to 2.8 GHz P1dB:18.5 dBm 輸出截獲點:37.5 dBm 功率增益類型:32 dB 噪聲系數(shù):0.85 dB 工作電源電壓:5 V 電源電流:125 mA 測試頻率:2.6 GHz 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:QFN-16 封裝:Reel |
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