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MAX7060
280MHz to 450MHz Programmable
ASK/FSK Transmitter
SDI_PWR1
SCLK_PWR0
Table 27. Output Power Settings
dB BELOW
P MAX
0 0 0
0 1 3
1 0 6
When the frequency is set to 315MHz, the PA capaci-
tance increases by the programmed value.
Figure 8 illustrates how to set the capacitance. It begins
with the ENABLE pin pulled low. The frequency is
sampled at the rising edge of the first pulse. Pulses
2–11 set the capacitance code to 0x0A (10dec), which
is approximately 2.5pF. The ENABLE pin is then pulled
1
1
10
high to finish the setting.
Frequency Deviation
Reset pin 19 ( CS _DEV) to 0 for 32kHz ( Q 16kHz) FSK
deviation and 1 for 100kHz ( Q 50kHz) FSK deviation.
Transmitter Power
Set SDI_PWR1 (pin 20) and SCLK_PWR0 (pin 21) to four
power settings (relative to the maximum power setting).
Note that at battery voltages below 3V, the top two power
settings are compressed and the power difference is
less than 3dB.
PA Variable Capacitor Setting
In manual mode, capacitance can be added to the PA
output for one selected frequency. This allows the user
to adjust the matching network when switching between
two frequencies in the manual selection table, or for
switching to one frequency that is significantly different
from the others in the table. The user can set the capaci-
tance by resetting the ENABLE pin to a logic-low, then
selecting the frequency for which the variable capacitor
is to be added from the seven possible settings, and
then sending a stream of 1 to 32 pulses through the DIN
pin. The first pulse is used to reset the internal capacitor
counter and to latch the selected frequency. After the first
pulse, the remaining number of pulses sent equals the
variable capacitor setting. When the ENABLE pin goes
high, the capacitor setting for the specified frequency is
set, so that it adds the programmed capacitance to the
PA when the chosen frequency is selected. This scheme
must be executed only once to set the value of the vari-
able capacitor.
For example, a user can operate the MAX7060 at
315MHz and 433.92MHz into a narrowband antenna
by resetting the ENABLE pin low, setting the FREQ0,
FREQ1, FREQ2 pins to 001 (315MHz), and sending the
appropriate number of pulses into the DIN pin, and then
setting the ENABLE pin high. When the frequency is set
to 433.92MHz (or any other frequency in the table except
315MHz), no capacitance is added to the PA output.
Maxim Integrated
Emulation Mode Settings
All the settings available through the manual mode of
operation are also easily accessible in the SPI mode.
This mode is called emulation mode, whereby only writ-
ing one or two registers, the whole transmitter can be
configured. The Conf2 register controls this mode.
The emulation mode is a subset of SPI mode. It gives SPI
users the capability to operate the part by programming
just one or two registers instead of all registers.
Since it is still SPI mode, pins 5, 6, and 7 (FREQ0, FREQ1,
and FREQ2) must be pulled low. The Conf2 register is
the only register that needs to be programmed. Setting
bit 7 (fixed) to 1 enables this mode. Bit 6 (fxmode) is
equivalent to pin 1 (GPO2_MOD) in manual mode. Bits
5 and 4 (fxpwr[1:0]) are equivalent to pin 20 and 21
(SDI_PWR1 and SCLK_PWR0) in manual mode. Bit 3
(fxhdev) is equivalent to pin 19 ( CS _DEV) in manual
mode. Bits 2, 1, and 0 (fxfrq[2:0]) are equivalent to pins
5, 6, and 7 (FREQ0, FREQ1, and FREQ2) in manual
mode.
Similar to manual mode, the PA capacitor setting in the
emulation mode can be done by toggling the DIN pin
with the ENABLE pin low. In addition, the capacitor set-
ting can also be done by directly writing to the capacitor
register (bits 4:0 of the Conf1 register, cap[4:0]). As long
as the capacitor register value is not zero, the capacitor
value sent in by toggling the DIN pin is ignored.
Control Interface Considerations
When operating the MAX7060 with a +4.5V to +5.5V
supply voltage, the CS _DEV, SCLK_PWR0, SDI_PWR1,
FREQ0, FREQ1, FREQ2, ENABLE, DIN, and LSHDN
pins can be driven by a microcontroller with either 3V or
5V interface logic levels. When operating the MAX7060
with a +2.1V to +3.6V supply, the microcontroller must
produce logic levels that conform to the V IH and V IL
specifications in the DC Electrical Characteristics for the
MAX7060.
27
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