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ISDB-T 1-Segment Tuner
Closed-Loop RF Gain Control
The MAX2163 can provide either open-loop RF gain
control by the GC1 pin or closed-loop RF automatic
gain control (AGC) by the on-chip power detector.
Automatic RF gain control is enabled by setting the
PDBM[1:0] bits to 00 as shown in the PDET/RF-FILT
register (Table 6). Setting the PDBM[1:0] bits to 10
allows open-loop RF gain control by the GC1 pin.
When the RF AGC loop is disabled, RF gain is con-
trolled by an external voltage that is applied to the GC1
pin. The GC1 pin’s input voltage range is 0.3V to 2.1V
with 0.3V providing the maximum RF gain.
When the RF AGC loop is enabled, the IF power detec-
tor output is internally connected to the GC1 input and
the RF gain is controlled by the power detector’s output
voltage. An external capacitor connected from the GC1
pin to ground sets the AGC loop response time. The
loop response time is calculated as follows:
t SETTLING = 41.7 x R x C EXT
where:
R = 1k ?
C EXT = External capacitor from GC1 to ground in
farads.
The attack point (referred to as the RF input) of the AGC
loop can be programmed from -66dBm to -52dBm and
is controlled by the PDET[2:0] bits in the PDET/RF-FILT
register (Table 6).
High-Side and Low-Side LO Injection
The MAX2163 allows selection between high-side and
low-side LO injection through the HSLS bit in the MODE
register (Table 7). To select low-side injection, set HSLS
to 1; to select high-side injection, set HSLS to 0.
IF Filter
The nominal IF filter center frequency and bandwidth
are 571kHz and 860kHz, respectively.
The center frequency of the IF bandpass filter is tuned
at the factory; however, the factory-set trim can be
bypassed and the center frequency can be adjusted
through the FLTS and TUN[2:0] bits in the IF Filter reg-
ister (Table 3). Set the FLTS bit to 0 to select the filter’s
center frequency to the factory-set tuning. Set the FLTS
bit to 1 to allow the filter ’s center frequency to be
adjusted with the TUN[2:0] bits (Table 3).
VCO Autoselect (VAS)
The MAX2163 includes three VCOs with each VCO hav-
ing 16 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
VSB[3:0] bits in the VCO register. The selected VCO and
sub-band is reported in the VAS STATUS register (read
only) (Table 13).
Alternatively, the MAX2163 can be set to autonomously
choose a VCO and VCO sub-band. Automatic VCO
selection is enabled by setting the VAS bit in the VAS
register (Table 4) and is initiated once the N-divider LSB
register word is loaded. In the event that the R-divider
is changed, both the R-Divider MSB and R-Divider
LSB registers must be reprogrammed. Also, if the
R-Divider or the N-Divider MSB is changed, the
N-Divider LSB register must also be reprogrammed to
initiate the VCO autoselect function. The VCO and
VCO sub-band that are programmed in the VCO[1:0] and
VSB[3:0] bits serve as the starting point for the automatic
VCO selection process when VASS = 0. When VASS = 1,
the current VCO and VCO sub-bands serve as the start-
ing point for the automatic VCO selection process.
During the selection process, the VASE bit in the VAS
STATUS register is cleared to indicate the autoselection
function is active. Upon successful completion, bits VASE
and VASA are set and the VCO and sub-band selected
are reported in the VAS STATUS register (Table 13). If the
search is unsuccessful, VASA is cleared and VASE is set.
This indicates that searching has ended, but no VCO has
been found, and occurs when trying to tune to a frequen-
cy outside the VCO’s specified frequency range.
Charge-Pump Select (CPS)
The MAX2163 allows for manual selection of the
charge-pump current (CPS = 0) or automatic selection
(CPS = 1). When in manual mode, the charge-pump
current is programmed by bits CP[1:0] in the R-Divider
LSB register (Table 9). In automatic selection mode, the
charge-pump current is automatically set based on
VTUNE voltage and current VCO sub-band. ADE, ADL,
and VAS bits must be programmed to 1. The selected
charge-pump current is reported in Table 18 .
Table 18. Charge-Pump Current Setting
When CPS = 1
VSB[3]
0
0
1
1
ADC[2]
0
1
0
1
CP (mA)
2
3
1.5
2.5
20
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