Data Sheet
Table Of Contents
- Overview
- Wi-Fi Key Features
- Specifications
- Applications
- CPU, Memory, and Flash
- Clock
- Radio
- Wi-Fi
- Power Management
- General Purpose Input/Output Interface (GPIO)
- Secure Digital Input/Output Interface (SDIO)
- Serial Peripheral Interface (SPI/HSPI)
- I2C Interface
- I2S Interface
- Universal Asynchronous Receiver Transmitter (UART)
- Pulse-Width Modulation (PWM)
- IR Remote Control
- ADC (Analog-to-Digital Converter)
- Electrical Characteristics
- RF Power Consumption
- Wi-Fi Radio Characteristics
- Must-Read Documents
- Must-Have Resources
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3. Functional Description
3.2.2. External Clock Requirements
An externally generated clock is available with the frequency ranging from 24 MHz to 52
MHz. The following characteristics are expected to achieve good performance of radio.
3.3. Radio
ESP8266EX radio consists of the following blocks.
• 2.4 GHz receiver
•
2.4 GHz transmitter
• High speed clock generators and crystal oscillator
• Bias and regulators
• Power management
3.3.1. Channel Frequencies
The RF transceiver supports the following channels according to IEEE802.11 b/g/n
standards.
Frequency tolerance
ΔFXO
–15
15
ppm
Frequency vs temperature (–25 °C ~ 75 °C)
ΔFXO,Temp
–15
15
ppm
Parameter
Symbol
Min
Max
Unit
Table 3-2. External Clock Reference
Parameter
Symbol
Min
Max
Unit
Clock amplitude
VXO
0.8
1.5
Vpp
External clock accuracy
ΔFXO,EXT
–15
15
ppm
Phase noise @1-kHz offset, 40-MHz clock
-
-
–120
dBc/Hz
Phase noise @10-kHz offset, 40-MHz clock
-
-
–130
dBc/Hz
Phase noise @100-kHz offset, 40-MHz clock
-
-
–138
dBc/Hz
Table 3-3. Frequency Channel
Channel No.
Frequency (MHz)
Channel No.
Frequency (MHz)
1
2412
8
2447
2
2417
9
2452
3
2422
10
2457
4
2427
11
2462
Espressif
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2020.10