Samsung NFA455 Users Manual
OEM/Intergrator manual of NFA455
Item
Vendor
Part Number
IEEE802.11 a.b.g.n.ac
Bluetooth 4.1 + HS
1. Introduction
NFA455 is a Wi-Fi / Bluetooth Combo module compliant with Dual-band 1x1 IEEE802.11a/b/g/n/ac and
Bluetooth 4.1+HS optimized for low-power applications.
The core chipset is from Qualcomm, part number QCA9377.
2. Hardware Architecture:
2.1 M
ain Chipset Information
mac/baseband/radio
2.2 Circuit Block Diagram
The major internal and external block diagram of
Qualcomm QCA9377
NFA455 is illustrated in Figure 1-1.
igure 1-1
F
Main (ANT0): WLAN 2.4G(2412~2462MHz), 5G(5180~5825MHz)
Aux (ANT1): Bluetooth (2402~2480MHz)
OSC: 48MHz
Version 1.0 Samsung Electronics page 1 of 5
NFA455 block diagram and System Interface
3. O
perational Description
NFA455 is the 802.11a/b/g/n /ac and Bluetooth 4.1 COMBO Module that acts as a communication
controller for users of a wireless device to connect to PC
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Features
>IEEE 802.11ac Draft compliant.
>Dual-band 2.4GHz /5 GHz
>Supports 20 MHz/40 MHz at 2.4 GHz and supports 20 MHz, 40 MHz, or 80 MHz at 5 GHz
>On-chip power amplifiers and low –noise amplifiers for both bands
>Complies with Bluetooth Core Specification Version 4.1 + HS
>Supports BT for class 1 and class 2 power-level transmissions without requiring an external PA
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Time base of the RF frequency
For RF frequency, 48MHz crystal is a clock reference.
Synthesizer
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Synthesizer and Internal voltage controlled oscillator (VCO) inside Transceiver provides the desired LOsignal based on the phase-locked loop (PLL) with a relatively wide tuning range for this application.
Also, generate the desired RF frequency through up-converting or down-converting using frequency direct
conversion method
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WIFI Transmission
Baseband data is modulated and upconverted to the 2.4GHz ISM and 5-GHz U-NII bands, respectively.
Linear on chip power amplifier are included, which are capable of delivering high output powers while
meeting IEEE802.11ac and IEEE802.a/b/g/n specifications without the need for external PAs. When using
the internal PAs, closed-loop output power control is completely integrated. Base-band Processing (BBP)
IC has DSSS (BPSK/QPSK/CCK) and OFDM (BPSK/QPSK/16QAM/64QAM/25QAM) modulation
function, it provides transmission data rate are 1, 2, 5.5, 11Mbps on DSSS and 6, 12, 18, 24, 36, 48, 54
Mbps on OFDM. Digital data signal will be converted to analog (TX IQ) signals through DAC in BBP IC,
TX IQ pass through to low pass filter. TX I/Q signal use direct conversion (zero-IF) architecture converter
to generate carrier frequency signal. Transceiver IC and internal PA magnify output power.
- WIFI Receiver
The NFA455 has a wide dynamic range, direct conversion receiver that employs high-order on-chip
channel filtering to ensure reliable operation in the noisy 2.4GHz ISM band or the entire 5GHz U-NII band.
Control signals are available that can support the use of optional LNAs for each band, wh ich can in cr ea s e
the receive sensitivity by several decibels.
Reverse direction isolation of LNA inside Transceiver IC suppresses unwanted radiation. Then RF signal
will be directly down to IF signal (RX IQ) and high frequency spurious emissions are suppressed by LPF.
At last RX IQ signal will be demodulated digital data.
Bluetooth Low Energy
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Version 1.0 Samsung Electronics page 2 of 5
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