MAX2165ETI+ Maxim Integrated Products, MAX2165ETI+ Datasheet - Page 18

• Manufacturer Part Number: MAX2165ETI+
• Description: RF Receiver Low power, zero-IF t uner for mobile TV F
• Manufacturer: Maxim Integrated Products

Specifications of MAX2165ETI+

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

Single-Conversion DVB-H Tuner
To close the RF gain-control loop, connect the 300µA
control current sink of the power detector (pin
OVLD_DET) to V
resulting voltage is fed with an RC lowpass to the
RF_AGC input.
The MAX2165 includes 3 VCOs with each VCO contain-
ing 8 VCO sub-bands. The appropriate VCO and VCO
sub-band for the desired local oscillator frequency can
be manually selected by programming the VCO[1:0]
and SB[2:0] bits in the VCO control register (Table 11).
Alternatively, the MAX2165 can be set to autonomously
choose a VCO and VCO sub-band. Automatic VCO
selection is enabled by setting the VAS bit in the VCO
Control register (Table 11). The autotuner begins
selecting the appropriate VCO once the fractional por-
tion of the N-divider has been programmed. Therefore,
when changing LO frequencies, all the N-divider regis-
ters (integer and fractional) must be programmed to
activate the autotuner function.
PLL lock detection can be achieved by monitoring the
MUX pin or by reading the LD bit in the Chip-Status
Readback register (Table 18).
The PLL charge-pump current can also be either manu-
ally programmed or automatically selected by the VCO
autotuner. Program the CPS bit in the PLL configuration
register (Table 8) to 1 to enable automatic charge-
Table 21. ROM Table
18
Reserved
Optimal tracking
filter notch settings
for operation
below 725MHz
and above
725MHz
Optimal tracking
settings at
780MHz and
470MHz
Optimal baseband
filter BW for 8MHz
channel
DESCRIPTION
______________________________________________________________________________________
Charge-Pump Current Selection
CC
ADDRESS
with a 40kΩ pullup resistor. The
0x0
0x1
0x2
0x3
MSB
TF_NTCH[3:0]
Tracking filter notch low
Recommended notch frequency settings for Rx
frequencies below 725MHz
TF_BAL[3:0]
Optimal tracking filter settings at 780MHz
BB_BW[3:0]
8MHz wide
D7
X
VCO Autotuner
D6
X
D5
X
pump-current selection, or program CPS to 0 to enable
manual charge-pump-current selection. The autotuner
function must be enabled (VAS = 1) to enable automat-
ic charge-pump-current selection. When in manual
mode, the charge-pump current is programmed by the
ICP bit in the PLL Configuration register.
During the autotuner selection process, the autotuner
must allow time for the PLL to settle before determining
if VCO selection was successful. This wait time is pro-
grammable through the ADLY[1:0] bits in the PLL
Configuration register (Table 8). Program the wait time
to be longer than the expected PLL settling time.
The MAX2165 integrates an RF notch filter that can be
used to notch out large interfering signals in the
830MHz to 950MHz frequency range to prevent perfor-
mance degradation when operating in the presence of
large cellular phone signals. The notch frequency of the
filter is programmable through the TF_NTCH[3:0] bits in
the Tracking Filter register (Table 6). Optimal notch fil-
ter codes for two different notch frequencies are stored
in an on-chip ROM table. See the Baseband Filter and
Tracking Filter section for additional details. When no
interfering cellular signals are present or when receiving
signals in the 783MHz to 860MHz frequency range, the
TF_NTCH[3:0] bits must be programmed to 111 to move
the notch out to the highest possible frequency to mini-
mize the filter’s in-band attenuation.
D4
X
DATA BYTE
TF_NTCH[3:0]
Tracking filter notch high
Recommended notch frequency settings for Rx
frequencies above 725MHz
TF_BAL[3:0]
Optimal tracking filter settings at 470MHz
VCO Autotuner Delay Selection
D3
X
X
D2
X
X
RF Notch Filter
D1
X
X
D0
X
X
LSB