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Complete Single-Conversion
Television Tuner
Application Information
RF Inputs
The MAX3541 features separate UHF and VHF inputs
that are matched to 75 Ω . Both inputs require a DC-
blocking capacitor. The active inputs are selected by
the input registers. In addition, the input registers
enable or disable the lowpass filter, which can be used
when the VHF input is selected. For the 47MHz to
68MHz, select the VHF_IN with the LPF filter enabled
(INPT = 00). For 174MHz to 230MHz, select VHF_IN
with LPF disabled (INPT = 01). For 470MHz to 862MHz,
select UHF_IN (INPT = 10).
RF Gain Control
The gain of the RF low-noise amplifier can be adjusted
over a typical range of 45dB with the RFAGC pin. The
RFAGC input accepts a DC voltage from 0.5V to 3V,
with 3V providing maximum gain. This pin can be con-
trolled with the IF power-detector output to form a
closed RF gain-control loop. See the Closed-Loop RF
Gain Control section for more information.
RF Tracking Filter
The MAX3541 includes a programmable tracking filter
for each band of operation to optimize rejection of
out-of-band interference while minimizing insertion
Table 16. ROM Table
MSB
DESCRIPTION ADDRESS
loss for the desired received signal. The center fre-
quency of each tracking filter is selected by a
switched-capacitor array that is programmed by the
TFS[7:0] bits in the Tracking Filter Series Capacitor
register and the TFP[5:0] bits in the Tracking Filter
Parallel Cap register.
Optimal tracking filter settings for each channel varies
from part to part due to process variations. To accom-
modate part-to-part variations, each part is factory cal-
ibrated by Maxim. During calibration, the y-intercept
and slope for the series and parallel tracking capacitor
arrays is calculated and written into an internal ROM
table. The user must read the ROM table upon power-
up and store the data in local memory (8 bytes total) to
calculate the optimal TFS[7:0] and TFP[5:0] settings
for each channel. Table 16 shows the address and
bits for each ROM table entry. See the Interpolating
Tracking Filter Coefficients section for more informa-
tion on how to calculate the required values.
Reading the ROM Table
Each ROM table entry must be read using a two-step
process. First, the address of the ROM bits to be read
must be programmed into the TFA[3:0] bits in the
Tracking Filter ROM Address register (Table 11).
LSB
DATA BYTE
D7
D6
D5
D4
D3
D2
D1
D0
Reserved
VHF Series
Y-Intercept
VHF Series
Slope
VHF Parallel
Y-Intercept
VHF Parallel
Slope
UHF Series
Y-Intercept
UHF Series
Slope
UHF Parallel
Y-Intercept
UHF Parallel
Slope
0x0
0x1
0x2
0x3
0x4
0x5
0x6
0x7
0x8
OD2
VS0[7]
VS1[7]
VP0[7]
VP1[7]
US0[7]
US1[7]
UP0[7]
UP1[7]
OD1
VS0[6]
VS1[6]
VP0[6]
VP1[6]
US0[6]
US1[6]
UP0[6]
UP1[6]
OD0
VS0[5]
VS1[5]
VP0[5]
VP1[5]
US0[5]
US1[5]
UP0[5]
UP1[5]
X
VS0[4]
VS1[4]
VP0[4]
VP1[4]
US0[4]
US1[4]
UP0[4]
UP1[4]
X
VS0[3]
VS1[3]
VP0[3]
VP1[3]
US0[3]
US1[3]
UP0[3]
UP1[3]
X
VS0[2]
VS1[2]
VP0[2]
VP1[2]
US0[2]
US1[2]
UP0[2]
UP1[2]
X
VS0[1]
VS1[1]
VP0[1]
VP1[1]
US0[1]
US1[1]
UP0[1]
UP1[1]
X
VS0[0]
VS1[0]
VP0[0]
VP1[0]
US0[0]
US1[0]
UP0[0]
UP1[0]
16
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MAX3542EVKIT+ 功能描述:射频开发工具 MAX3542 Eval Kit RoHS:否 制造商:Taiyo Yuden 产品:Wireless Modules 类型:Wireless Audio 工具用于评估:WYSAAVDX7 频率: 工作电源电压:3.4 V to 5.5 V
MAX3543CTL+ 功能描述:调谐器 Broadband Analog & Digital TV Tuner RoHS:否 制造商:NXP Semiconductors 功能: 噪声系数: 工作电源电压: 最小工作温度: 最大工作温度:
MAX3543CTL+T 功能描述:调谐器 Broadband Analog & Digital TV Tuner RoHS:否 制造商:NXP Semiconductors 功能: 噪声系数: 工作电源电压: 最小工作温度: 最大工作温度:
MAX3543EVKIT+ 功能描述:射频开发工具 MAX3542/3 Eval Kit RoHS:否 制造商:Taiyo Yuden 产品:Wireless Modules 类型:Wireless Audio 工具用于评估:WYSAAVDX7 频率: 工作电源电压:3.4 V to 5.5 V
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