RF2938 Просмотр технического описания (PDF) - RF Micro Devices
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RF2938 Datasheet PDF : 20 Pages
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RF2938
Pin
17
18
19
20
Function
NC
PA IN
NC
VCC5
Description
No internal connection. May be grounded or connected on adjacent
signal or left floating. Connect to ground for best results.
Input to the power amplifier stage. This is a 50Ω input. Requires DC
blocking/tuning cap.
No internal connection. May be grounded or connected on adjacent
signal or left floating. Connect to ground for best results.
Supply for the RF LO buffer, RF upconverter and amplifier.
Interface Schematic
See pin 14.
CBYP
22 nF
From
TX VGA
VCC
CBYP
22 nF
VCC5
Pin 20
VB
VCC
RF OUT
Pin 22
12 mA
To TX RF
Image Filter
RF LO
Pin 21
CBLOCK
22 pF
From
RF VCO
21
22
23
24
11 25
26
27
28
29
30
31
32
33
34
35
2-6
RF LO
RF OUT
IF1 OUT-
NC
IF1 OUT+
TXI BP
TXI DATA
TXQ BP
TXQ DATA
VCC4
I OUT
RXI DATA
Q OUT
RXQ DATA
NC
Single ended LO input for the transmit upconverter. External matching See pin 20.
to 50Ω and a DC block are required.
Upconverted Transmit signal. This 50Ω output is intended to drive an See pin 20.
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 VCC to IF1 OUT-.
IF1 OUT+
No internal connection. May be grounded or connected on adjacent
signal or left floating. Connect to ground for best results.
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 VCC to IF1 OUT+.
See pin 23.
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.
This is the quadrature modulator bypass pin. A 10nF capacitor to
ground is recommended.
Q input to the baseband 5 pole Bessel LPF for the transmit modulator.
Power supply for quadrature modulator.
Baseband analog signal output for in-phase channel.
500mVP-P linear output.
Logic-level data output for the in-phase channel. This is a digital output
signal obtained from the output of a Schmitt trigger.
0.3V to VCC3 - 0.3V swing minimum.
Baseband analog signal output for quadrature channel.
500mVP-P linear output.
Logic-level data output for the quadrature channel. This is a digital out-
put signal obtained from the output of a Schmitt trigger.
0.3V to VCC3 - 0.3V swing minimum.
No internal connection. May be grounded or connected on adjacent
signal or left floating. Connect to ground for best results.
IF1 OUT-
Rev A8 010418
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