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參數(shù)資料
| 型號： | RF2938TR13 |
| 英文描述： | Interface IC |
| 中文描述： | 接口IC |
| 文件頁數(shù)： | 6/20頁 |
| 文件大?。?/td> | 606K |
| 代理商： | RF2938TR13 |
2-6
RF2938
Rev A9 020122
11
T
SeeUpgradedProductRF2948B
Q OUT
Baseband analog signal output for quadrature channel.
500mV
P-P
linear output.
RXQ DATA
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.
NC
No internal connection. May be grounded or connected on adjacent
signal or left floating. Connect to ground for best results.
Pin
17
Function
NC
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 50
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
18
PA IN
See pin 14.
19
NC
20
VCC5
21
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-.
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 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 20.
22
RF OUT
See pin 20.
23
IF1 OUT-
24
NC
25
IF1 OUT+
See pin 23.
26
TXI BP
27
28
TXI DATA
TXQ BP
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.
29
30
31
TXQ DATA
VCC4
I OUT
Power supply for quadrature modulator.
Baseband analog signal output for in-phase channel.
500mV
P-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.
32
RXI DATA
33
34
35
C
BLOCK
22 pF
To TX RF
Image Filter
12 mA
From
TX VGA
V
CC
C
BYP
22 nF
VCC5
Pin 20
V
CC
C
BYP
22 nF
RF OUT
Pin 22
VB
RF LO
Pin 21
From
RF VCO
IF1 OUT+
IF1 OUT-
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