BC41B143A-ds-001Pe CSR, BC41B143A-ds-001Pe Datasheet - Page 51

• Manufacturer Part Number: BC41B143A-ds-001Pe
• Description: Blue Core ROM
• Manufacturer: CSR

10 Device Terminal Descriptions
10.1
The BlueCore4-ROM RF_IN terminal can be configured as either a single ended or differential input. The
operational mode is determined by the setting the PS Key PSKEY_TXRX_PIO_CONTROL (0x20).
10.1.1 TX_A and TX_B
TX_A and TX_B form a complementary balanced pair. On transmit; their outputs are combined using a balun into
the single-ended output required for the antenna. Similarly, on receive their input signals are combined internally.
Both terminals present similar complex impedances that require matching networks between them and the balun.
Starting from the substrate (chip side), the outputs can each be modelled as an ideal current source in parallel
with a lossy resistance and a capacitor. The bond wire can be represented as series inductance.
BC41B143A-ds-001Pe
RF Ports
PA
+
_
LNA
_
+
This material is subject to CSR’s non-disclosure agreement
Figure 10.1: Circuit TX/RX_A and TX/RX_B
© Cambridge Silicon Radio Limited 2005
Production Information
Switch
Switch
RF
RF
R2
10
R3
10
0.9pF
0.9pF
Device Terminal Descriptions
BlueCore4-ROM
L2
1.5nH
L3
1.5nH
Page 51 of 102
TX_A
TX_B