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RF2938 の電気的特性と機能

RF2938のメーカーはRF Micro Devicesです、この部品の機能は「2.4GHZ SPREAD-SPECTRUM TRANSCEIVER」です。


製品の詳細 ( Datasheet PDF )

部品番号 RF2938
部品説明 2.4GHZ SPREAD-SPECTRUM TRANSCEIVER
メーカ RF Micro Devices
ロゴ RF Micro Devices ロゴ 




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RF2938 Datasheet, RF2938 PDF,ピン配置, 機能
2
Typical Applications
• Wireless LANs
• Wireless Local Loop
• Secure Communication Links
RF2938
2.4GHZ SPREAD-SPECTRUM TRANSCEIVER
• Inventory Tracking
• Wireless Security
• Digital Cordless Telephones
Product Description
The RF2938 is a monolithic integrated circuit specifically
designed for direct-sequence spread-spectrum systems
operating in the 2.4GHz ISM band. The part includes a
direct conversion from IF receiver, quadrature demodula-
tor, I/Q baseband amplifiers with gain control and RSSI,
on-chip programmable baseband filters, dual data com-
parators. For the transmit side, a QPSK modulator and
upconverter are provided. The design reuses the IF
SAW filter for transmit and receive reducing the number
of SAW filters required. Two cell or regulated three cell
(3.6V maximum) battery applications are supported by
the part. The part is also designed to be part of a 2.4GHz
chip set consisting of the RF2444 LNA/Mixer and one of
the many RFMD high efficiency GaAs HBT PA’s and a
dual frequency synthesizer.
Optimum Technology Matching® Applied
Si BJT
üSi Bi-CMOS
GaAs HBT
SiGe HBT
GaAs MESFET
Si CMOS
48 47 46 45 44 43 42 41 40 39 38 37
NC 1
36 NC
NC 2
35 NC
PD 3
RX
RX EN 4
TX EN 5
VCC1 6
34 RXQ DATA
33 Q OUT
I
32 RXI DATA
Q
31 I OUT
RX IF IN 7
RX_EN
TX IF IN 8
TX_EN
VCC9 9 TX
TX VGC 10
IF LO 11
VCC8 12
Β2 +45°
-45°
30 VCC4
29 TXQ DATA
I
28 TXQ BP
Q
27 TXI DATA
26 TXI BP
Σ
25 IF1 OUT+
13 14 15 16 17 18 19 20 21 22 23 24
9.00
+ 0.20
0.10 -A-
0.00
9.00
+ 0.10
0.50
4.57
+ 0.10 sq.
0.22
+ 0.05
7° MAX
0° MIN
Exposed pad protrusion
0.0000 to 0.0127 (see note 4).
0.17 MAX.
7.00 1.00
+ 0.10 sq.
+ 0.10
0.60
Dimensions in mm
NOTES:
1. Shaded lead is Pin 1.
+ 0.15
0.10
2. Lead coplanarity - 0.08 with respect to datum "A".
3. Leadframe material: EFTEC 64T copper or equivalent, 0.127 mm (0.005) thick.
4. Solder plating (85/15) on exposed area.
Package Style: TQFP-48 EDF, 9x9
Features
• 45MHz to 500MHz IF Quad Demod
• On-Chip Variable Baseband Filters
• Quadrature Modulator and Upconverter
• 2.7V to 3.6V Operation
• Part of 2.4GHz Radio Chipset
• 2.4GHz PA Driver
Ordering Information
RF2938TR13 2.4GHz Spread-Spectrum Transceiver (Tape & Reel)
RF2938 PCBA Fully Assembled Evaluation Board
11
Functional Block Diagram
RF Micro Devices, Inc.
7628 Thorndike Road
Greensboro, NC 27409, USA
Tel (336) 664 1233
Fax (336) 664 0454
http://www.rfmd.com
Rev A8 010418
2-1

1 Page





RF2938 pdf, ピン配列
RF2938
Parameter
Data Amplifiers
Bandwidth
Gain (Limiting mode)
Rise and Fall Time
Logic High Output
Logic Low Output
Hysteresis
Transmit Modulator and
LPF
Filter Gain
Baseband Filter 3dB Bandwidth
Passband Ripple
Group Delay
Specification
Min.
Typ.
Max.
40
VCC - 0.3 V
60
2
VCC
30
5
0.3
0
1 35
0.1
15
Group Delay
Ultimate Rejection
Input Impedance
Input AC Voltage
Input DC Offset Requirement
IF Frequency Range
Output Impedance
I/Q Phase Balance
I/Q Gain Balance
Conversion Voltage Gain
400
> 80
3
200
1.6 1.7 1.8
45 500
2
±2 ±5
0.5 ± 0.25
1.0
1.1
Output P1dB
-6
Carrier Output
-30
Harmonic Outputs
Transmit VGA and
Upconverter
VGA Gain Range
VGA Input Voltage Range
VGA Gain Sensitivity
VGA Input Impedance
RF Mixer Output Impedance
VGA/Mixer Conversion Gain
VGA/Mixer Output Power
-30
17
1.0 to 2.0
17
230-j400
75 - j350
50
+10 to +27
-9
VGA/Mixer Output Power
-4
Unit Condition
MHz
dB
ns
V
V
mV
Open Loop.
5pF load.
Source Current 1mA
Sink Current 1mA.
dB
MHz
dB
ns
ns
dB
k
mVp-p
V
MHz
k
dB
V/V
dBm
dBm
dBc
Any setting
5th order Bessel LPF, Set by BW CTRL
At 35MHz, increasing as bandwidth
decreases.
At 2MHz.
Single ended
Linear, Single ended.
For correct operation.
Open Collector when TX on, hi-Z when off
With Current Combination into 50single-
ended load
With Current Combination into 50single-
ended load
Without external offset adjustments.
280 MHz
dB
V
dB/V
dB
dBm
dBm
Positive Slope
280 MHz
374 MHz
With matching elements.
With 50match on the output.
1dB compression - Single Side Band,
TX GC=1.0V
1dB compression - Single Side Band,
TX GC=2.0V
11
Rev A8 010418
2-3


3Pages


RF2938 電子部品, 半導体
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 50input. 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 50and a DC block are required.
Upconverted Transmit signal. This 50output 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

6 Page



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部品番号部品説明メーカ
RF2938

2.4GHZ SPREAD-SPECTRUM TRANSCEIVER

RF Micro Devices
RF Micro Devices


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