MAX3543CTL+ Maxim Integrated Products, MAX3543CTL+ Datasheet - Page 17

• Manufacturer Part Number: MAX3543CTL+
• Description: RF Receiver Multi-band Ananlog a and Digital TV Tuner
• Manufacturer: Maxim Integrated Products

Specifications of MAX3543CTL+

• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Table 24. R14: TEST1 Register (Address: 14h)
Table 25. R15: ROM WRITE DATA Register (Address: 15h)
Note: This register is not available to the end user.
Note: This register is not available to the end user.
The MAX3543 features separate low- and high-frequency
inputs. These two inputs are combined to a single input
by an off-chip diplexer circuit as shown in the Typical
Application Circuit. When the desired channel is less
than 345MHz, use RFINL. When the desired input is
greater than 345MHz, use RFINH. Further, when the
desired input is less than 110MHz, an internal lowpass
filter should be enabled to limit high-frequency interfer-
ence incident at the mixer input. The lowpass filter is
enabled by the RFLPF bit in R05[5].
Besides selecting the appropriate input port and setting
RFLPF appropriately, one of three tracking filters must
be chosen based on the desired frequency. Set TFB
(R05[3:2]) to select VHFL, VHFH, or UHF tracking filter
bands. Use VHFL when the desired frequency is less
than 196MHz, use VHFH when the desired frequency
is between 196MHz and 440MHz, or use UHF when the
desired frequency is greater than 440MHz.
The MAX3543 is designed to control its own RF gain
based on internally measured signal and blocker levels.
The user can adjust the AGC attack points (takeover
points) by setting WDPA and NDPA in register R0B.
Alternatively, the user can control the RF gain by driving
the RFVGC input pin.
ROMW[7:0]
RESERVED
BIT NAME
BIT NAME
BIT LOCATION
BIT LOCATION
(0 = LSB)
(0 = LSB)
Applications Information
______________________________________________________________________________________
7:0
7:0
RF Inputs and Filters
SETTING
TYPICAL
TYPICAL
SETTING
N/A
0100
0000
RF Gain Control
Maxim use only
Must set to 0100 0000 for proper operation
Digital Television Tuner
The MAX3543 frequency synthesizer includes three
VCOs with 16 sub-bands for each VCO. These VCOs
and sub-bands are selected to best center the VCO
near the operating frequency. This selection process is
performed automatically by the VAS circuitry. The Maxim
driver software seeds the VCO starting band for fastest
selection time.
In addition to VCO selection, a VCO divider value of 32,
16, 8, or 4 must be selected to provide the desired mixer
LO drive frequency. The divider is selected by VDIV in
register R00[1:0].
The MAX3543 includes 13 ROM registers to store fac-
tory calibration data (see Table 26). Each ROM table
entry must be read using a two-step process. First,
the address of the ROM bits to be read must be pro-
grammed into the ROM ADDR register (R0E[3:0]).
Once the address has been programmed, the data
stored in that address is automatically transferred to the
ROM READBACK register (R10[7:0]). The ROM data at
the specified address can then be read from the ROM
READBACK register and stored in the microprocessor’s
local memory. After all ROM registers have been read
and stored in the microprocessor’s local memory, ROM
ADDR must be programmed to 00 for proper operation.
Multiband Analog and
FUNCTION
FUNCTION
VCO and VCO Divider Selection
Reading the ROM Table
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