HFA3860 Datasheet, PDF (3/40 Pages) Intersil Corporation – 11 Mbps Direct Sequence Spread Spectrum Baseband Processor

HFA3860
HFA3726
(FILE# 4067)
HFA3860
(FILE# 4347)
HFA3424 (NOTE)
(FILE# 4131)
HFA3624
UP/DOWN
CONVERTER
(FILE# 4066)
RXI
A/D
DEMOD
DE-
SPREAD
I
RXQ
A/D
÷2
0^o/90^{o M}
U
M RSSI
U
802.11
A/D
CCA
MAC-PHY
INTERFACE
X
X
TXI
RFPA
HFA3925
(FILE# 4132)
VCO VCO
Q
DUAL SYNTHESIZER
HFA3524 (FILE# 4062)
QUAD IF MODULATOR
SPREAD
TXQ
MOD.
DSSS BASEBAND PROCESSOR
TYPICAL TRANSCEIVER APPLICATION CIRCUIT USING THE HFA3860
NOTE: Required for systems targeting 802.11 specifications.
Pin Descriptions
NAME
V_DDA
(Analog)
V_DD
(Digital)
GND
(Analog)
GND
(Digital)
V_REFN
V_REFP
I_IN
Q_IN
ANTSEL
ANTSEL
RSSI
PIN
10, 18, 20
TYPE I/O
DESCRIPTION
Power DC power supply 2.7V - 3.6V (Not Hardwired Together On Chip).
7, 21, 29, 42 Power DC power supply 2.7 - 3.6V
11, 15, 19 Ground DC power supply 2.7 - 3.6V, ground (Not Hardwired Together On Chip).
6, 22, 31, 41 Ground DC power supply 2.7 - 3.6V, ground.
17
I
“Negative” voltage reference for A/D’s (I and Q) [Relative to V_REFP]
16
I
“Positive” voltage reference for A/D’s (I, Q and RSSI)
12
I
Analog input to the internal 3-bit A/D of the In-phase received data.
13
I
Analog input to the internal 3-bit A/D of the Quadrature received data.
26
O
The antenna select signal changes state as the receiver switches from antenna to antenna during the
acquisition process in the antenna diversity mode. This is a complement for ANTSEL (pin 27) for
differential drive of antenna switches.
27
O
The antenna select signal changes state as the receiver switches from antenna to antenna during the
acquisition process in the antenna diversity mode. This is a complement for ANTSEL (pin 26) for
differential drive of antenna switches.
14
I
Receive Signal Strength Indicator Analog input.
4-3