Data Sheet
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Espressif Systems
ESP8266 Datasheet
7.1. Channel Frequencies
The RF transceiver supports the following channels according to the IEEE802.11b/g/n standards.
Table 20 Frequency Channel
7.2. 2.4 GHz Receiver
The 2.4GHz receiver downconverts the RF signal to quadrature baseband signals and converts them
to the digital domain with 2 high resolution high speed ADCs. To adapt to varying signal channel
conditions, RF filters, automatic gain control (AGC), DC offset cancelation circuits and baseband
filters are integrated within ESP8266EX.
7.3. 2.4 GHz Transmitter
The 2.4GHz transmitter up-converts the quadrature baseband signals to 2.4GHz, and drives the
antenna with a high powered CMOS power amplifier. The use of digital calibration further improves
the linearity of the power amplifier, enabling a state of art performance of delivering +19.5dBm
average power for 802.11b transmission and +16dBm for 802.11n transmission.
Additional calibrations are integrated to cancel any imperfections of the radio, such as:
▪
carrier leakage,
▪
I/Q phase matching, and
▪
baseband nonlinearities
This reduces the amount of time required and test equipment required for production testing.
7.4. Clock Generator
The clock generator generates quadrature 2.4 GHz clock signals for the receiver and transmitter. All
components of the clock generator are integrated on-chip, including:
Channel No
Frequency (MHz)
Channel No
Frequency (MHz)
1
2412
8
2447
2
2417
9
2452
3
2422
10
2457
4
2427
11
2462
5
2432
12
2467
6
2437
13
2472
7
2442
14
2484
Espressif Systems / August 1, 2015
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