|
|
PDF TQ5121 Data sheet ( Hoja de datos )
| Número de pieza | TQ5121 | |
| Descripción | 3V Cellular TDMA/AMPS LNA/mixer Receiver IC | |
| Fabricantes | TriQuint Semiconductor | |
| Logotipo |  |
|
Hay una vista previa y un enlace de descarga de TQ5121 (archivo pdf) en la parte inferior de esta página. Total 10 Páginas | ||
|
No Preview Available !
WIRELESS COMMUNICATIONS DIVISION
N/C 1
N/C 2
Vdd MXR 3
MXR LO 4
VDD LNA 5
GND 6
RF IN 7
GND 8
16 Optional
GND
15 N/C
14 Mixer IF/
Vdd
13 GND
12 MXR RF
11 GND
10
LNA
Out
9 N/C
Product Description
The TQ5121 is a 3V, RF receiver IC designed specifically for Cellular band TDMA
applications. It’s RF performance meets the requirements of products designed to
the IS-136 and AMPS standards. The TQ5121 is pin compatible with TQ9222, which
enables handset designers to use strategic board platform strategy. The TQ5121
contains LNA+Mixer circuits to handle the 800MHz cellular band.
The mixer uses a high-side LO frequency, with the IF covering a range of 70 to
140MHz. Most RF ports are internally matched to 50 Ω, greatly simplifying the
design and keeping the number of external components to a minimum. The TQ5121
achieves good RF performance with low current consumption, supporting long
standby times in portable applications. Coupled with the very small QSOP-16
package, the part is ideally suited for Cellular band mobile phones.
Electrical Specifications1
Parameter
Frequency
Min Typ Max
869 894
Units
MHz
Gain 17.5 dB
Noise Figure
2.7 dB
Input 3rd Order Intercept
-8.5 dBm
DC supply Current
10.0 mA
Note 1: Test Conditions: Vdd=2.8V, Ta=25C, filter IL=2.5dB, RF=881MHz, LO=991MHz, IF=110MHz,
LO input=-7dBm
TQ5121
DATA SHEET
3V Cellular TDMA/AMPS
LNA/mixer Receiver IC
Features
§Pin compatible with TQ9222
(dual-band TDMA receiver)
§Single 3V operation
§Low-current operation
§50 Ω matched inputs
§QSOP-16 plastic package
Applications
§IS-136 Mobile Phones
§AMPS Mobile Phones
§ISM 900MHz
For additional information and latest specifications, see our website: www.triquint.com
1
1 page  
TQ5121 Product Description
The TQ5121 3V RFIC Downconverter is designed specifically
for cellular band TDMA applications. The TQ5121 contains a
LNA+Mixer circuit to handle the 800 MHz cellular band. The IF
frequency range covers 70 to 140 MHz with most of the ports
internally matched to 50 Ω simplifying the design and keeping
the number of external components to a minimum.
Operation
Please refer to the test circuit above.
Low Noise Amplifier (LNA)
The LNA section of the TQ5121 consists of a cascaded
common source FETs (see Fig 1). The LNA is designed to
operate on supply voltages from 3V to 5V. The source terminal
has to be grounded very close to the pin, this will avoid a
significant gain reduction due to degeneration. The LNA
requires a matching circuit on the input to provide superior
noise, gain and return loss performance. The output is close to
50 Ω for direct connection to a 50 Ω image stripping filter.
Vdd
Fig 1. TQ5121
Simplified
Schematic of
LNA Section
LOAD
LNA
out
LNA
in
BIAS
LNA Input Match
BIAS
To obtain the best possible combination of performance and
flexibility, the LNA was designed to be used with off-chip
impedance matching on the input. Based on the system
requirements, the designer can make several performance
trade-offs and select the best impedance match for the
particular application.
The input matching network primarily determines the noise and
gain performance. Fig 2 shows a suggested input match using
a series 1.2pF capacitor and a shunt 10nH inductor.
The LNA gain, noise figure and input return loss are a function
of the source impedance (Zs), or reflection coefficient (Γs),
TQ5121
Data Sheet
Fig 2. Suggested LNA Input Match
1.2pF
RF
IN 10nH
Pin 7
Note: These values assume ideal components and neglect board parasitic.
The discrepancy between these values and those of the typical application
circuit are the board and component parasitic
presented to the input pin. Highest gain and lowest return loss
occur when Γs is equal to the complex conjugate of the LNA
input impedance. A different source reflection coefficient, Γopt,
which is experimentally determined, will provide the lowest
possible noise figure, Fmin.
The noise resistance, Rn, provides an indication of the sensitivity
of the noise performance to changes in Γs as seen by the LNA
input.
( )FLNA = FMIN +
4RN ⋅
Z0 1+
Γopt − ΓS 2
Γopt 2 ⋅ 1 − Γs 2
Components such as filters and mixers placed after the LNA
degrade the overall system noise figure according to the
following equation:
FSYSTEM = FLNA + F 2 − 1
GLNA
FLNA and GLNA represent the linear noise factor and gain of the
LNA and F2 is the noise factor of the next stage. Thus, the
system noise figure depends on the highest gain and minimum
noise figure of the LNA.
Designing the input matching network involves a compromise
between optimum noise performance and best input return loss.
For example, when the TQ5121 LNA is matched for optimum
noise figure (1.35dB @ 880 MHz), the input return loss is
approximately 4dB. On the other hand, when the LNA is
matched for best return loss, the LNA noise figure is
approximately 1.95dB @ 881 MHz. See Table 1 for noise
parameters.
For additional information and latest specifications, see our website: www.triquint.com
5
5 Page | ||
| Páginas | Total 10 Páginas | |
| PDF Descargar | [ Datasheet TQ5121.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| TQ5121 | 3V Cellular TDMA/AMPS LNA/mixer Receiver IC | TriQuint Semiconductor |
| TQ5122 | 3V Cellular TDMA/AMPS Receiver IC With Power- Down | TriQuint Semiconductor |
| Número de pieza | Descripción | Fabricantes |
| SLA6805M | High Voltage 3 phase Motor Driver IC. |
 Sanken |
| SDC1742 | 12- and 14-Bit Hybrid Synchro / Resolver-to-Digital Converters. |
 Analog Devices |
|
DataSheet.es es una pagina web que funciona como un repositorio de manuales o hoja de datos de muchos de los productos más populares, |
| DataSheet.es | 2020 | Privacy Policy | Contacto | Buscar |