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參數(shù)資料
| 型號： | RF2948B |
| 廠商： | RF MICRO DEVICES INC |
| 元件分類： | 無繩電話/電話 |
| 英文描述： | 2.4GHz SPREAD-SPECTRUM TRANSCEIVER |
| 中文描述： | TELECOM, CELLULAR, RF AND BASEBAND CIRCUIT, QCC32 |
| 封裝： | 5 X 5 MM, QFN-32 |
| 文件頁數(shù)： | 6/18頁 |
| 文件大?。?/td> | 413K |
| 代理商： | RF2948B |
11-244
RF2948B
Rev A6 040930
NOTFORNEWDESGNS
capacitor to ground. (22nF recommended)
29
BW CTRL
This pin requires a resistor to ground to set the baseband LPF band-
width of the receiver and transmit GmC filter amps.
30
VCC2
Supply for the I and Q baseband and GmC filters. This pin should be
bypassed with a 10nF capacitor.
Pin
13
Function
PA IN
Description
Input to the power amplifier stage. This is a 50
input. Requires DC-
blocking/tuning cap.
Supply for the RF LO buffer, RF upconverter and amplifier.
Interface Schematic
See pin 12.
14
VCC5
15
RF LO
Single-ended LO input for the transmit upconverter. External matching
to 50
and a DC-block are required.
Upconverted Transmit signal. This 50
output is intended to drive an
RF filter to suppress the undesired sideband, harmonics, and other out-
of-band mixer products.
The inverting open collector output of the quadrature modulator. This
pin needs to be externally biased and DC isolated from other parts of
the circuit. This output can drive a Balun with IF1 OUT+, to convert to
unbalanced to drive a SAW filter. The Balun can be either broadband
(transformer) or narrowband (discrete LC matching). Alternatively, just
IF1 OUT+ can be used to drive a SAW single-ended with an RF choke
(high Z
at IF) from V
CC
to IF1 OUT-.
The non-inverting open collector output of the quadrature modulator.
This pin needs to be externally biased and DC isolated from other parts
of the circuit. This output can drive a Balun with IF1 OUT-, to convert to
unbalanced to drive a SAW filter. The Balun can be either broadband
(transformer) or narrowband (discrete LC matching). Alternatively, just
IF1 OUT+ can be used to drive a SAW single-ended with an RF choke
(high Z
at IF) from V
CC
to IF1 OUT+.
This is the in-phase modulator bypass pin. A 10nF capacitor to ground
is recommended.
I input to the baseband 5 pole Bessel LPF for the transmit modulator.
See pin 14.
16
RF OUT
See pin 14.
17
IF1 OUT-
18
IF1 OUT+
See pin 17.
19
TXI BP
20
21
TXI DATA
TXQ BP
This is the quadrature phase modulator bypass pin. A 10nF capacitor
to ground is recommended.
Q input to the baseband 5 pole Bessel LPF for the transmit modulator.
22
23
24
TXQ DATA
VCC4
I OUT
Power supply for quadrature modulator.
Baseband analog signal output for in-phase channel.
700mV
P-P
linear output.
Baseband analog signal output for quadrature channel.
700mV
P-P
linear output.
Buffered version of the VREF1 output. See pin 31.
Sink/Source current <1mA.
DC feedback capacitor for in-phase channel. Requires capacitor to
ground. (22nF recommended)
DC feedback capacitor for quadrature channel. Requires decoupling
25
Q OUT
26
VREF1 BUF
27
DCFB I
28
DCFB Q
C
BLOCK
22 pF
To TX RF
Image Filter
12 mA
From
TX VGA
V
CC
C
BYP
22 nF
V
CC
C
BYP
22 nF
RF LO
From
RF VCO
VB
VCC5
RF OUT
IF1 OUT+
IF1 OUT-
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