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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.
| 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 | 470 | MHz | |
| TX power（high power） | @VCC=4.0V | 31 | 32.5 | 33 | dBm |
| TX power（low power） | 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 400~470 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
| 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 |
