SA878 : 2W Embedded Walkie Talkie Module Adopt TCXO Crystal Oscillator

SA878 : 2W Embedded Walkie Talkie Module Adopt TCXO Crystal Oscillator

SA878 is a cost-effective integrated professional walkie-talkie module, built-in high-speed microcontroller, high-performance RF transceiver chip and RF power amplifier, and provides a standard serial port to communicate with the module, so that the module's related parameters can be set quickly and easily. Function control. Users only need to connect an audio amplifier, microphone, and speaker to this module to work as a small walkie-talkie. The simplified interface and ultra-small size make this module widely available, and can be easily and quickly embedded in various handheld devices to improve the overall performance of the terminal products.

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SA878 2W Embedded small size walkie talkie module V1.3.pdf

Parameter	Test condition	Min	Typ.	Max	Unit
Power supply		3.3	4.2	5.5	V
Working Temperature range		-30	25	70	℃
Current Consumption
Sleep current			≤1		uA
RX current			60		mA
TX current（High power）			900	950	mA
TX current（low power）			450	550	mA
Transmitting RF Parameters
Frequency range	UHF	400		480	MHz
TX power（high power）	@VCC=4.0V	31	32.5	33	dBm
TX power（low power）	@VCC=4.0V	24	25	26	dBm
Modulation frequency	@1.5KHz/2.5KHz Frequency offset		10		mV
Audio modulation distortion	@1.5KHz/2.5KHz Frequency offset		2	5	%
SignaltoNoiseRatio	@1.5KHz/2.5KHz Frequency offset	38	40	45	dB
adjacent-channel power	@12.5K offset		-60		dBc
CTCSS Modulation frequency		0.35	0.5	0.75	KHz
Receiving RF Parameters
Receiving sensitivity	13dB Output voice signal ratio		-124		dBm
Receiving SNR	@1.5KHz Frequency offset	45	50		dB
Audio output amplitude			700		mV
Audio Output impedance			200		OHm

Type	Analog walkie talkie
Output Power	2W

Features of Walkie Talkie Module SA878

UHF band 400~480 MHz
Transmit receive frequency independent
Bandwidth 12.5 KHz
RSSI signal strength indication
Open distance is 5 kilometers
High receiving sensitivity: -124 dBm
Highly integrated small volume
38-level CTCSS analog sub-audio code
166-level positive phase, inverted CDCSS digital sub-audio
8-level squelch
8-level adjustable volume
High and low power options (1.6W/8W)
Wide operating voltage 3.3-5.5 V
Built-in EEPROM, data saved even powered off
Stable with 1ppm TCXO crystal

Application of Walkie Talkie Module SA878

Small walkie talkie
Ignore the intercom system
Building community security system
Outdoor sports products
Audio monitoring system

Pins of walkie talkie module SA878

Pin NO.	Pin name	I/O state
1	MIC_IN	Microphone or line in
2	TXD	TXD of the module and connect to external RXD
3	RXD	RXD of the module and connect to external TXD
4、5、6	NC	Not connected
7	ANT	connect 50 ohm antenna
8、9、10	GND	Grounding
11	VCC	Connect power positive
12	H/L	high/low output power control; Leave open for high output power，low level to low output power. (Please kindly note: this pin can NOT be connected to VDD or high level of cmos output)
13	CS	Power Down control, "0" for power down mode; "1" for the normal work; Default power down mode
14	PTT	Module Input, Transmitting/receiving control, "0" force the module to enter TX state; and "1" to Rx state
15	+3.3V	3.3V voltage output pin, can be connected to 50mA load
16	LINE_OUT	Audio output (between 200mv-1400mv, can be set by software)
17	NC	Not connected
18	SPKEN	Receive signal indication pin (can externally control audio power amplifier), active high level, default low level
19、20	GND	Grounding

SA878 : 2W Embedded Walkie Talkie Module Adopt TCXO Crystal Oscillator

Features of Walkie Talkie Module SA878

Application of Walkie Talkie Module SA878

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