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ISDB-T Single-Segment Low-IF Tuners
Loop Time Constant Pin (LTC)
The LTC function sets the wait time for an ADC read
when in VCO autoselect mode. The time constant is set
by charging an external capacitor connected to the
LTC pin with a constant current source. The value of
the current source can be programmed to 1μA or 2μA
with the LTC bit in the VCO register (see Table 4).
The LTC time constant is determined by the following
equation:
Time constant = C LTC x 1.7 / I LTC
where:
C LTC = capacitor connected from the
LTC pin to ground.
I LTC = 1μA (LTC = 0) or 2μA (LTC = 1).
Setting C LTC equal to 1000pF gives a time constant
of 1.7ms with I LTC set to 1μA and 0.85ms with I LTC
set to 2μA.
ENTCXO
The MAX2160/EBG have both an integrated crystal
oscillator and a separate TCXO buffer amplfier. The
ENTCXO pin controls which reference source is used
(see Table 14).
XTALOUT Divider
A reference buffer/divider is provided for driving exter-
nal devices. The divider can be set for any division ratio
from 1 to 31 by programming the XD[4:0] bits in the
XTAL divide register (see Table 6). The buffer can be
disabled by setting XD[4:0] to all zeros.
Table 14. Reference Source Selection
ENTCXO FUNCTION
Shutdown and Standby Modes
The MAX2160/EBG feature hardware- and software-
controlled shutdown mode as well as a software-con-
trolled standby mode. Driving the SHDN pin low with bit
EPD = 0 places the device in hardware shutdown
mode. In this mode, the entire device including the 2-
wire-compatible interface is turned off and the supply
current drops to less than 10μA. The hardware shut-
down pin overrides the software shutdown and standby
modes.
Setting the PWDN bit in the XTAL divide register
enables power-down mode. In this mode, all circuitry
except for the 2-wire-compatible bus is disabled, allow-
ing for programming of the MAX2160/EBGs’ registers
while in shutdown. Setting the STBY bit in the XTAL
divide register puts the device into standby mode, dur-
ing which only the 2-wire-compatible bus, the crystal
oscillator, the XTAL buffer, and the XTAL buffer-divider
are active.
In all cases, register settings loaded prior to entering
shutdown are saved upon transition back to active
mode. Default register values are loaded only when
V CC is applied from a no-V CC state. The various power-
down modes are summarized in Table 15. Supply cur-
rent fluctuations for nondefault register settings are
shown in Table 16.
Diagnostic Modes and Test Pin
The MAX2160/EBG have several diagnostic modes that
are controlled by the D[2:0] bits in the test register (see
Table 2). The local oscillator can be directed to the
TEST pin for LO measurements by setting the D[2:0] bits
to all ones. In this mode, the supply current will increase
by approximately 10mA. The TEST pin requires a 10k ?
pullup resistor to V CC for proper operation.
V CC
GND
The TCXO input is enabled for use with an
external TCXO
The XTAL input is enabled for use with an external
crystal
Table 15. Power-Down Modes
POWER-DOWN CONTROL
CIRCUIT STATES
MODE
Normal
Shutdown
Power-Down
Standby
SHDN PIN
V CC
GND
V CC
V CC
PWDN
BIT
0
X
1
0
STBY
BIT
0
X
0
1
SIGNAL
PATH
ON
OFF
OFF
OFF
2-WIRE
INTERFACE
ON
OFF
ON
ON
XTAL
ON
OFF
OFF
ON
DESCRIPTION
All circuits active
All circuits disabled
2-wire interface is active
2-wire interface, XTAL, and XTAL
buffer/divider are active
20
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