PBL 402 15
Pin Descriptions (cont.):
Pin number
Name
24
GndRSSI
Function
Ground connection to the RSSI.
Schematic in/output of the pin
A diode to GndFM and GndIF
VCCRF
25
PA Gate
Output control signal for external PA power on/off. PA - Gate
26
IFIN-
27
IFIN+
28
GndIF
29
VCCIF
30
LD
31
32
33, 36
37, 40
34
35
IFOUT-
IFOUT+
GndRF
RX-
RX+
38
TX-
39
TX+
41
VCCRF
Rx IF inputs to internal channel filtering, limiting
amplifiers,RSSI and FM discriminator. Internally
matched to 300 Ω.
Ground connection to the down IF convertor and
channel filter sections.
Voltage supply to the down IF convertor and
channel filter sections.
Lock detect.
GndRF
VCCIF
IFIN-/IFIN+
both inputs alike
GndIF
A diode to GndFM and GndIF
Clamp to GndIF
VCCRF
LD
Rx IF outputs to external adjacent channel filter.
Internally matched to 300Ω.
GndRF
VCCRF
IFOUT-/IFOUT+
both outputs alike
Ground connection to the RF sections.
RF inputs to LNA and image reject mixer.
Internally matched to 100Ω.
Tx outputs to external PA. Internally matched to
100 Ω. Each output requires an externalchoke
to VCC.
Voltage supply to the RF sections.
GndRF
A diode to GndIF and GndPLL
VCCRF
RX-/RX+
both inputs alike
GndRF
VCCRF
TX-/TX+
Both inputs alike
GndRF
Clamp to GndRF
VCCPLL
42
GATE
Input to gate the Tx output power.
43
D
Serial interface, Data .
GATE
GndPLL
VCCPLL
D
GndPLL
Bias
Bias
5