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PDF ADA-4643 Data sheet ( Hoja de datos )
| Número de pieza | ADA-4643 | |
| Descripción | Silicon Bipolar Darlington Amplifier | |
| Fabricantes | AVAGO | |
| Logotipo |  |
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ADA-4643
Silicon Bipolar Darlington Amplifier
Data Sheet
Description
Avago Technologies’ ADA-4643 is an economical, easy-to-
use, general purpose silicon bipolar RFIC gain block am-
plifiers housed in a 4-lead SC-70 (SOT-343) surface mount
plastic package which requires only half the board space
of a SOT-143 package.
The Darlington feedback structure provides inherent
broad bandwidth performance, resulting in useful ope-
rating frequency up to 2.5 GHz. This is an ideal device for
small-signal gain cascades or IF amplification.
ADA-4643 is fabricated using Avago’s HP25 silicon bipolar
process, which employs a double-diffused single poly-
silicon process with self-aligned submicron emitter
geometry. The process is capable of simultaneous high fT
and high NPN breakdown (25 GHz fT at 6 V BVCEO). The
process utilizes industry standard device oxide isolation
technologies and submicron aluminum multilayer inter-
connect to achieve superior performance, high uniformity,
and proven reliability.
Surface Mount Package
SOT-343
Pin Connections and Package Marking
Features
Small Signal gain amplifier
Operating frequency DC – 2.5 GHz
Unconditionally stable
50 Ohms input & output
Flat, Broadband Frequency Response up to 1 GHz
Operating Current: 20 to 60 mA
Industry standard SOT-343 package
Lead-free option available
Specifications
900 MHz, 3.5 V, 35 mA (typ.)
17 dB associated gain
13.4 dBm P1dB
28.3 dBm OIP3
4 dB noise figure
VSWR < 2.2 throughput operating frequency
Single supply, typical Id = 35 mA
Applications
Cellular/PCS/WLL base stations
Wireless data/WLAN
Fiber-optic systems
ISM
Typical Biasing Configuration
Rc
=
Vcc –
Id
Vd
VCC = 5 V
Rc Cbypass
RFout
& Vd
GND
GND
RFin
RF
input
Cblock
2Tx
RFC
Cblock
Vd = 3.5 V
RF
output
Note:
Top View. Package marking provides orientation and identification.
“2T” = Device Code
“x” = Date code character identifies month of manufacture.
Attention: Observe precautions for
handling electrostatic sensitive devices.
ESD Machine Model (Class A)
ESD Human Body Mode (Class 1B)
Refer to Avago Application Note A004R:
Electrostatic Discharge, Damage and Control.
1 page  
ADA-4643 Typical Performance Curves (at 25° C, unless specified otherwise), continued
20 35
15 30
10 25
5 20
0
-5
-10
0 10 20 30 40
Id (mA)
Figure 9. P1dB vs. Id and Temperature at 900 MHz.
50
-40° C
25° C
85° C
60 70
15
10
5
0 10 20 30 40 50
Id (mA)
Figure 10. OIP3 vs. Id and Temperature at 900 MHz.
-40° C
25° C
85° C
60 70
16
5
4
3
2
1
0
0 10 20 30 40
Id (mA)
Figure 11. NF vs. Id and Temperature at 900 MHz.
50
-40° C
25° C
85° C
60 70
20
18
16
14
12
10
8
0 10 20 30 30
Id (mA)
Figure 12. Gain vs. Id and Frequency (GHz).
30
0.1
0.5
0.9
1.5
2.0
2.5
3
4
5
6
30 40
25 40
20
0.1 35
0.5
0.1
0.5
15
0.9
1.5
30
0.9
2.0 1.5
10
2.5
3
25
2.0
2.5
5
4
5
20
3
64
0
15
5
6
-5 10
-10 0 10 20 30 40 50 60 70
Id (mA)
5 0 10 20 30 40 50 60 70
Id (mA)
Figure 13. P1dB vs. Id and Frequency (GHz).
Figure 14. OIP3 vs. Id and Frequency (GHz).
5
5 Page 
Ordering Information
Part Number
No. of Devices
Container
ADA-4643-TR1
3000
7” Reel
ADA-4643-TR2
10000
13” Reel
ADA-4643-BLK
100
antistatic bag
ADA-4643-TR1G
3000
7” Reel
ADA-4643-TR2G
10000
13” Reel
ADA-4643-BLKG
100
antistatic bag
Note: For lead-free option, the part number will have the character “G” at the end.
Package Dimensions
Outline 43
SOT-343 (SC70 4-lead)
1.30 (.051)
BSC
HE E
Recommended PCB Pad Layout for
Avago’s SC70 4L/SOT-343 Products
1.30
(0.051)
1.00
(0.039)
0.60
(0.024)
2.00
(0.079)
b1
D
1.15 (.045) BSC
A A2
b A1
SYMBOL
E
D
HE
A
A2
A1
b
b1
c
L
DIMENSIONS (mm)
MIN. MAX.
1.15 1.35
1.85 2.25
1.80 2.40
0.80 1.10
0.80 1.00
0.00 0.10
0.15 0.40
0.55 0.70
0.10 0.20
0.10 0.46
LC
NOTES:
1. All dimensions are in mm.
2. Dimensions are inclusive of plating.
3. Dimensions are exclusive of mold flash & metal burr.
4. All specifications comply to EIAJ SC70.
5. Die is facing up for mold and facing down for trim/form,
ie: reverse trim/form.
6. Package surface to be mirror finish.
0.9
(0.035)
1.15
(0.045)
Dimensions in
mm
(inches)
11
11 Page | ||
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