Ubiquiti M442G Users Manual
QCA9994 Dual-Band 4x4 with 4 SS MIMO
802.11 b/g/n/ac WLAN SoC
Device Specification
1 Introduction
1.1 General description
The QCA9994 with Qualcomm® VIVE
network (WLAN) system-on-chip (SoC) for 2.4 802.11n WLAN applications. The QCA9994 is a synthesizer WLAN radio. It includes a
CPU and memory for WLAN media access layer (MAC) and physical layer (PHY) management and
provides host offload of other high-level networking tasks. It enables high-performance 4x4 MIMO with 4
spatial streams for wireless applications demanding the highest robust link quality and maximum
throughput and range, plus 4 spatial stream MU-MIMO. The QCA9994 integrates a multi-protocol MAC,
PHY, analog-to-digital/digital-to-analog converters (ADC/DAC), 4x4 MIMO radio transceivers, and PCIE
interface in an all-CMOS device for low power consumption and small form-factor applications.
The QCA9994 implements half-duplex OFDM, CCK, and DSSS PHY. In 2 GHz mode it supports up to
346.7 Mbps for 20 MHz and 800 Mbps for 40 MHz channel operations, and IEEE 802.11b/g/n data rates.
, Maximal Likelihood (ML) decoding, Low-Density Parity Check (LDPC), Maximal Ratio Combining
(MRC), Space Time Block Code (STBC), and On-Chip OneTime Programmable (OTP) memory to eliminate the need for an external flash and to further reduce the external component count and BOM cost. The
QCA9994 supports 802.11 wireless MAC protocol, 802.11i security, Wi-Fi offload, error recovery, and
802.11e quality of service (QoS).
The QCA9994 supports up to four simultaneous spatial streams integrating four Tx and four Rx chains for
high throughput and extended coverage. Tx chains combine PHY in-phase (I) and quadrature (Q) signals,
convert them to the desired frequency, and drive the RF signal through external power amplifiers (PAs). Rx
chains receive from antennas through external LNAs. The frequency synthesizer supports 1-MHz steps to
match frequencies defined by IEEE 802.11b/g/n specifications. The QCA9994 supports frame data
transfer to and from the host using a PCIE interface that supports interrupt generation and reporting and
status reporting. Other external interfaces include EEPROM and GPIOs.
TM
802.11ac technology is a highly integrated wireless local area
QCA9994 Dual-Band 4x4 with 4 SS MIMO 802.11ac/abgn WLAN SoC Device Specification Introduction
1.2 Features
General
4x4 SU-/MU-MIMO technology improves effective throughput and range over existing 802.11ac/b/
g/n
products
Support for up to four spatial streams
Support for 48-MHz crystal
156-pin, 12 mm x 12 mm DRQFN package
Package footprint compatible with QCA9980/QCA9990
WLAN
Supports 20/40
Supports up to 64 QAM
Data rates of up to 346.7 Mbps for 20 MHz channels and 800 Mbps for 40 MHz channels in 2 GHz
mode using short GI
TCP and UDP checksum offload
Dynamic bandwidth switching
Maximal likelihood (ML) decoding
Supports spatial multiplexing, cyclic-delay diversity (CDD), low-density parity check (LDPC),
maximal ratio combining (MRC), Space Time Block Code (STBC)
AMSDU and AMPDU frame aggregation
802.11e-compatible bursting
Digital predistortion
Support for locationing (RSSI and RTT-based, 802.11REVmc compliant)
MHz at 2.4 GHz
Supported Standards
802.1
1ac/b/g/n
Support for IEEE 802.11d, e, h, i, j, k, r, u, v time stamp, w, and z standards
CPU/Memory
Integrated CPU for Wi-Fi offload with memory
On-chip OTP memory
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