EM2420-STR Ember, EM2420-STR Datasheet - Page 48

• Manufacturer Part Number: EM2420-STR
• Description: IC RF TXRX ZIGBEE 2.4GHZ 48-QLP
• Manufacturer: Ember

Specifications of EM2420-STR

• Mfg Application Notes: EM2420
• Frequency: 2.4GHz
• Data Rate - Maximum: 250kbps
• Modulation Or Protocol: 802.15.4
• Applications: ZigBee™
• Power - Output: -3dBm
• Sensitivity: -94dBm
• Voltage - Supply: 2.1 V ~ 3.6 V
• Current - Receiving: 19.7mA
• Current - Transmitting: 17.4mA
• Data Interface: PCB, Surface Mount
• Antenna Connector: PCB, Surface Mount
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 48-QLP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Memory Size: -

VCO and PLL Self-Calibration
VCO
The VCO is completely integrated and
operates at 4800 – 4966 MHz. The VCO
frequency is divided by 2 to generate
frequencies in the desired band (2400-
2483.5 MHz).
PLL self-calibration
The VCO's characteristics will vary with
temperature, changes in supply voltages,
and the desired operating frequency.
Output Power Programming
The RF output power of the device is
programmable and is controlled by the
TXCTRL.PA_LEVEL
shows the output power for different
settings,
programming
PA_LEVEL
31
27
23
19
15
11
7
3
Voltage Regulator
The
voltage regulator. This is used to provide a
1.8 V power supply to the
supplies. The voltage regulator should not
be used to provide power to other circuits
because
capability and noise considerations.
The voltage regulator input pin VREG_IN
is connected to the unregulated 2.1 to 3.6
V power supply. The voltage regulator is
enabled / disabled using the active high
Ember Part Number: 120-0049-000D
EM2420
Table 9. Output power settings and typical current consumption @ 2.45 GHz
of
including
includes a low drop-out
of
limited
TXCTRL register
0xA0FF
0xA0FB
0xA0F7
0xA0F3
0xA0EF
0xA0EB
0xA0E7
0xA0E3
the
register.
power
TXCTRL control
the
EM2420
Table
complete
sourcing
power
EM2420 Datasheet
9
Output Power [dBm]
0
-1
-3
-5
-7
-10
-15
-25
In order to ensure reliable operation the
VCO’s bias current and tuning range are
automatically calibrated every time the RX
mode or TX mode is enabled, i.e., in the
RX_CALIBRATE,
TX_ACK_CALIBRATE control states in
Figure 23 on page 41.
register. The typical current consumption
is also shown.
The power amplifier can be operated in
differential mode.
voltage regulator enable pin VREG_EN.
The regulated 1.8 V voltage output is
available
simplified
regulator is shown in Figure 26.
The voltage regulator requires external
components
Application Circuit section on page 17.
When disabling the voltage regulator, note
that register and RAM programming will
on
schematic
Current Consumption [mA]
17.4
16.5
15.2
13.9
12.5
11.2
9.9
8.5
as
the
TX_CALIBRATE and
described
VREG_OUT
EM2420
of
the
Page 48 of 84
in
pin.
voltage
the
A