EM250-BBRD-R Ember, EM250-BBRD-R Datasheet - Page 108

• Manufacturer Part Number: EM250-BBRD-R
• Description: EM250 BREAKOUT BOARD
• Manufacturer: Ember
• Type: Transceiver, 802.15.4r

Specifications of EM250-BBRD-R

• Frequency: 2.4GHz
• For Use With/related Products: EM250
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 636-1024

EM250
7 Typical Application
120-0082-000S
Figure 16 illustrates the typical application circuit, and Table 39 contains an example Bill of Materials for the
off-chip components required by the EM250.
Note: The circuit shown in Figure 16 is for illustrations purposes only as it does not contain the decoupling
The Balun provides the impedance transformation from the antenna to the EM250 for both TX and RX modes.
Ember has developed reference designs based upon two balun topologies, a monolithic (ceramic) balun and a
LC Lattice Balun.
The harmonic filter (L2, C2 and C3) provides additional suppression of the second harmonic, which increases
the margin over the FCC limit.
The 24MHz crystal with loading capacitors is required and provides the high frequency source for the EM250.
The 32.768kHz crystal generates the clock source for the Sleep Timer, but it is not mandatory as the internal
RC Oscillator can be used.
The RC debounce filter (R4 and C9) is suggested to improve the noise immunity of the RESET logic (Pin 13).
capacitors for the different VDD nets. For a complete reference design, please download one of the
Ember Reference Designs from the Ember website (www.ember.com).
Figure 16. Typical Application Circuit
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