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參數資料
| 型號： | RF2938TR13 |
| 英文描述： | Interface IC |
| 中文描述： | 接口IC |
| 文件頁數： | 5/20頁 |
| 文件大?。?/td> | 606K |
| 代理商： | RF2938TR13 |
2-5
RF2938
Rev A9 020122
11
T
SeeUpgradedProductRF2948B
lector output. The output match is formed by an inductor to V
CC
, which
supplies DC and a series cap.
VCC6
Power supply for the PA driver amp. This inductance to ground via
decoupling, along with an internal series capacitor, forms the interstage
match.
Pin
1
Function
NC
Description
No internal connection. May be grounded or connected on adjacent
signal or left floating. Connect to ground for best results.
No internal connection. May be grounded or connected on adjacent
signal or left floating. Connect to ground for best results.
This pin is used to power up or down the transmit and receive base-
band sections. A logic high powers up the quad demod mixers, TX and
RX GmC LPF’s, baseband VGA amps, data amps, and IF LO buffer
amp/ phase splitter. A logic low powers down the entire IC for sleep
mode. Also, see State Decode Table.
Interface Schematic
2
NC
3
PD
4
RX EN
Enable pin for the receiver 15dB gain IF amp and the RX VGA amp.
Powers up all receiver functions when PD is high, turns off the receiver
IF circuits when low. Also, see State Decode Table.
This pin is used to enable the transmit upconverter, buffer amps, 15db
IF amp, quad mod mixers, TX LO buffer, TX VGA, and PA driver. TX EN
is active low, when TX EN <1V, the transmit circuit is active if PD is
high. A logic high (TX EN >2V) disables the transmit IF/RF circuitry and
quad mod. Also, see State Decode Table.
Power supply for RX VGA amplifier, IC logic and RX references.
See pin 3.
5
TX EN
See pin 3.
6
7
VCC1
RX IF IN
IF input for receiver section. Must have DC blocking cap. The capacitor
value should be appropriate for the IF frequency. External matching to
50
recommended. For half duplex operation, connect RX IF IN and
TX IF IN signals together after the DC blocking caps, then run a trans-
mission line from the output of the IF SAW. AC coupling capacitor must
be less than 150pF to prevent delay in switching RX to TX/TX to RX.
Input for the TX IF signal after SAW filter. External DC blocking cap
required. External matching to 50
recommended. For half duplex
operation, connect RX IF IN and TX IF IN signals together after the DC
blocking caps, then run a transmission line from the output of the IF
SAW. AC coupling capacitor must be less than 150pF to prevent delay
in switching RX to TX/TX to RX.
See pin 8.
8
TX IF IN
9
VCC9
TX VGC
IF LO
Power supply for the TX 15dB gain amp and TX VGA.
10
11
Gain control setting for the transmit VGA. Positive slope.
IF LO input. Must have DC blocking cap. The capacitor value should be
appropriate for the IF frequency. LO frequency=2xIF. Quad mod/
demod phase accuracy requires low harmonic content from IF LO, so it
is recommended to use an n=3 LPF between the IF VCO and IF LO.
This is a high impedance input and the recommended matching
approach is to simply add a 100
shunt resistor at this input to con-
strain the mismatch. This pin requires a 6.5
μ
A DC bias current. This
can be accomplished with a 270k
resistor to V
CC
for 3.3V operation.
Power supply for IF LO buffer and quadrature phase network.
12
13
VCC8
NC
No internal connection. May be grounded or connected on adjacent
signal or left floating. Connect to ground for best results.
This is the output transistor of the power amp stage. It is an open col-
lector output. The output match is formed by an inductor to V
CC
, which
supplies DC and a series cap.
14
RF OUT
15
16
See pin 14.
10k
ESD
VCC
To Logic
Pins
3, 4, 5
DC Block
50
μ
strip
IF
SAW
Filter
Pin 7
Pin 8
IF VCO
C2
150 pF
IF LO
Pin 11
Recommended Matching
Network for IF LO
100
270 k
V
CC
From
TX RF
Image Filter
Bias
VCC6
Pin 16
V
CC
C
BYP
22 nF
V
CC
C
BYP
22 nF
PA OUT
Pin 14
PA OUT
Pin 15
PA IN
Pin 18
Power
Amp
Output
34 mA
14 mA
μ
s
Bias
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