CT UNITE ZK-7921 WiFi 6 Communication Module User Manual

CT UNITE ZK-7921 WiFi 6 Communication Module

Product Information

The ZK-7921 is a WiFi 6 communication module designed by Diao Pengjun. It can be used with laptops, computers, TVs, and set-top boxes. The module operates with a minimum distance of 20cm between the radiator and the user’s body. The model is Wi-Fi 6, 2T2R and has absolute maximum ratings that define levels at which permanent damage to the device can occur. The module should not be used or stored in a corrosive atmosphere, especially where chloride gas, sulfide gas, acid, alkali, salt, or moisture are present. Assembling the modules should be done within 6 months, and the soldering ability should be checked in case of 6 months over.

Product Usage Instructions

To use the ZK-7921, follow these instructions:

1. Install the module on your laptop device, computer, TV, or set-top box.
2. Ensure that there is a minimum distance of 20cm between the radiator and your body while using the device.
3. Do not use or store the module in a corrosive atmosphere, especially where chloride gas, sulfide gas, acid, alkali, salt, or moisture are present.
4. Store the module where the temperature and relative humidity do not exceed 5 to 40 and 20 to 60%.
5. Assemble the modules within 6 months and check the soldering ability in case of 6 months over.

Features

• ZK-7921 is the small size and low power module for IEEE 802.11a/b/g/n/ac/a wireless LAN. ZK-7921 is based on MT7921AUN
• solution.IEEE802.11a/b/g/n/ac/axDual Band WLAN infrastructure Size: 100.3mmx 50.5mmx 11.5mm 2.4GHz&5GHZ &BT5.2
• Support 1024QAM
• Support 2*2 MU-MIMO,OFDMA
• Rate up to 1774.5Mbps
• Operation mode STA,AP,P2P USB2.0*1
• Supports drivers for Windows/Linux/Android
• Security: WPA3,WPA2, WPS2.0,WAPI, WEP,T KIP, CKIP, AES, GCMP, SMS4
• Application: DTV, DVR, HD DVD Player, Blue-ray Disk Player, STB This equipment could be used on a laptop device, computer, TV, and set-top box, but it needs to be installed and operated with a minimum distance of 20cm between the radiator & your body.

Ordering Information

Absolute Maximum Ratings

Caution: The specifications in Table 1 define levels at which permanent damage to the device can occur. Function operation is not guaranteed under these conditions. Operating at absolute maximum conditions for extend periods can adversely affect the long-term reliability of the device.

< Table 1 Absolute Maximum Ratings > . Other conditions

1. Do not use or store modules in the corrosive atmosphere, especially where chloride gas, sulfide gas, acid, alkali, salt or the like are contained. Also, avoid exposure to moisture.
2. Store the modules where the temperature and relative humidity do not exceed 5 to 40℃ and 20 to 60%.
3. Assemble the modules within 6 months. Check the soldering ability in case of 6 months over.

Operating Conditions

Standard Test Conditions

The Test for electrical specification shall be performed under the following condition unless otherwise specified.

1. Ambient condition
   • Temperature:25℃ ± 5℃. Humidity:65% ± 5% R.H.
2. Power supply voltages
   • 3.3V (±5%) input power at the Module
3. Current consumption over recommended range of supply voltage and
   • operating
   • conditions is like below.
   • When it’s tested, it must be supplied more than 2 times of maximal current.

Electrical Specifications

DC Characteristics

mA

Idle and Associated state| –| 160| –
Radio disabled state| –| 20| –

RF Characteristics for IEEE802.11b ( 11Mbps mode unless otherwise specified)

Spectrum Mask
1st side lobes ( to fc ±11MHz)| –| -43| -30| dBr
2nd side lobes ( to fc ±22MHz)| –| -58| -50| dBr
Modulation Accuracy (EVM)| –| 30| 30| %
Power On/Off ramp| –| 0.5| 2.0| Usec
Freq. Tolerance| -15| –| 15| ppm
Chip Clock Freq. Tolerance| -15| –| 15| ppm
RX Characteristics| Min.| Typ.| Max.| Unit
Minimum Input Level Sens   (FER ≤ 8%)| –| -86| -76| dBm
Maximum Input Level (FER ≤ 8%)| -10| –| –| dBm

Normal Condition : 25℃, VDD=3.3.

RF Characteristics for IEEE802.11g ( 54Mbps mode unless otherwise specified)

Spectrum Mask
at fc ±11MHz| –| -32| -20| dBr
at fc ±20MHz| –| -43| -28| dBr
at fc ≥ ± 30MHz| –| -48| -40| dBr
Constellation Error (EVM)| –| -34| -28| dB
Freq. Tolerance| -15| –| 15| ppm
Chip Clock Freq. Tolerance| -15| –| 15| ppm
RX Characteristics| Min.| Typ.| Max.| Unit
Minimum Input Level Sens. (PER ≤ 10%)| –| -75| –| dBm
Maximum Input Level (PER ≤ 10%)| -20| –| –| dBm

Normal Condition : 25℃, VDD=3.3

RF Characteristics for IEEE802.11n ( MCS7 mode unless otherwise specified)

7,40.5,54,81,108,121.5,135Mbps

TX Characteristics| Min.| Typ.| Max.| Unit
Power Level| 12| 14| 16| dBm
Spectrum Mask
at fc ±11MHz| –| -32| -20| dBr
at fc ±20MHz| –| -43| -28| dBr
at fc ≥ ± 30MHz| –| -48| -40| dBr
Constellation Error (EVM)| –| -35| -29| dB
Freq. Tolerance| -15| –| 15| ppm
Chip Clock Freq. Tolerance| -15| –| 15| ppm
RX Characteristics| Min.| Typ.| Max.| Unit
Minimum Input Level Sens.(HT20,PER ≤ 10%)| –| -73| -66| dBm
Minimum Input Level Sens.(HT40,PER ≤ 10%)| –| -70| -63| dBm
Maximum Input Level (PER ≤ 10%)| -20| –| –| dBm

RF Characteristics for IEEE802.11a ( 54Mbps mode unless otherwise specified)

Spectrum Mask
at fc ±11MHz| –| -32| -20| dBr
at fc ±20MHz| –| -35| -28| dBr
at fc ≥ ± 30MHz| –| -45| -40| dBr
Constellation Error (EVM)| –| -35| -28| dB
Freq. Tolerance| -15| –| 15| ppm
Chip Clock Freq. Tolerance| -15| –| 15| ppm
RX Characteristics| Min.| Typ.| Max.| Unit
Minimum Input Level Sens. (PER ≤ 10%)| –| -75| -68| dBm
Maximum Input Level (PER ≤ 10%)| -30| –| –| dBm

RF Characteristics for IEEE802.11n ( MCS7 mode unless otherwise specified)

Spectrum Mask
at fc ±11MHz| –| -32| -20| dBr
at fc ±20MHz| –| -35| -28| dBr
at fc ≥ ± 30MHz| –| -45| -40| dBr
Constellation Error (EVM)| –| -35| -29| dB
Freq. Tolerance| -15| –| 15| ppm
Chip Clock Freq. Tolerance| -15| –| 15| ppm
RX Characteristics| Min.| Typ.| Max.| Unit
Minimum Input Level Sens.(HT20,PER ≤ 10%)| –| -76| -64| dBm
Minimum Input Level Sens.(HT40,PER ≤ 10%)| –| -73| -61| dBm
Maximum Input Level (PER ≤ 10%)| -30| –| –| dBm

RF Characteristics for IEEE802.11ac

Spectrum Mask
at fc ±11MHz| –| -32| -20| dBr
at fc ±20MHz| –| -35| -28| dBr
at fc ≥ ± 30MHz| –| -45| -40| dBr
Constellation Error (EVM)| –| -35| -29| dB
Freq. Tolerance| -15| –| 15| ppm
Chip Clock Freq. Tolerance| -15| –| 15| ppm
RX Characteristics| Min.| Typ.| Max.| Unit
Minimum Input Level Sens.(HT80,PER ≤ 10%)| –| -68| -61| dBm
Maximum Input Level (PER ≤ 10%)| -30| –| –| dBm

RF Characteristics for IEEE802.11ax

Spectrum Mask
at fc ±11MHz| –| -32| -20| dBr
at fc ±20MHz| –| -35| -28| dBr
at fc ≥ ± 30MHz| –| -45| -40| dBr
Constellation Error (EVM)| –| -35| -29| dB
Freq. Tolerance| -15| –| 15| ppm
Chip Clock Freq. Tolerance| -15| –| 15| ppm
RX Characteristics| Min.| Typ.| Max.| Unit
Minimum Input Level Sens.(HT80,PER ≤ 10%)| –| -67| -61| dBm
Maximum Input Level (PER ≤ 10%)| -30| –| –| dBm

Bluetooth Specification

Bluetooth Specification Conditions : VBAT=3.3V; Temp:25°C

General Specification
Bluetooth Standard| Bluetooth 5.2 BLE
Host Interface| USB /SDIO/UART
Antenna Reference| Small antennas with 0~2 dBi peak gain
Frequency Band| 2.400 GHz ~ 2483.5 GHz
Number of Channels| 80 channels
Modulation| FHSS, GFSK, DPSK, DQPSK
RF Specification
 | Min.| Typical.| Max.
Output Power (Class 1.5)|  | 10|
Output Power (Class 2)|  | 2|
Sensitivity @ BER=0.1%

for GFSK (1Mbps)

|  | -86|
Sensitivity @ BER=0.01%

for π/4-DQPSK (2Mbps)

|  | -86|
Sensitivity @ BER=0.01%

for 8DPSK (3Mbps)

|  | -80|

Maximum Input Level

| GFSK (1Mbps):-20dBm
π/4-DQPSK (2Mbps) :-20dBm
8DPSK (3Mbps) :-20dBm

The device supports BT and WIFI functions. It is in conformity with the relevant Union harmonization legislation: Radio Equipment directive: 2014/53/EU. 5G Wifi alerts and restricted country codes The device is restricted to indoor use only when operating in the 5150 to 5350 MHz frequency range.

This equipment complies with CE radiation exposure limits set forth for an uncontrolled environment. This equipment should be installed and operated with minimum distance of 20 cm between the radiator and your body.Any Changes or modifications not expressly approved by the party responsible for compliance could void the user’s authority to operate the equipment. This device complies with Part 15 of the FCC Rules. Operation is subject to the following two conditions:

1. this device may not cause harmful interference, and
2. this device must accept any interference received, including interference that may cause undesired operation.

Note: This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates uses and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one or more of the following measures:

• Reorient or relocate the receiving antenna.
• Increase the separation between the equipment and the receiver.
• Connect the equipment to an outlet on a circuit different from that to which the receiver is connected.
• Consult the dealer or an experienced radio/TV technician for help.

This equipment complies with FCC radiation exposure limits set forth for an uncontrolled environment. This equipment should be installed and operated with minimum distance 20cm between the radiator & your body.

Version：

• Date： 2022.8.31
• MODEL NAME: ZK-7921,ZK-7921AU-TV,ZK-7921US, ZK-7921-M2AE,ZK-7921-DG,ZK-7921-DGX, ZK-7921-PC
• PRODUCT NAME: WiFi 6 communication module
• DESIGN： Diao Pengjun
• CHECK：
• APPROVAL：

The information contained herein is the exclusive property of ZK and shall not be distribwritten permission of ZK

References

• Ren Røros

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