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Part Number: MX909A
Description: The MX909A is a low power CMOS device containing all of the baseband signal processing and Medium Access Control (MAC) ...
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MX909A
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DataSheet
General Description
MX909A General Description
The MX909A is a low power CMOS device containing all of the baseband signal processing and Medium Access Control (MAC) protocol functions required for a high performance GMSK Wireless Packet Data Modem. The MX909A interfaces with a host C and radio modulation/demodulation circuits to deliver reliable two-way transfer of application data over a wireless link.
The MX909A assembles application data received from the host C, adds forward error correction (FEC), and error detection (CRC) codes, time-spreads this data by interleaving (burst-error protection) and scrambles (randomizes) the bit pattern. After automatically adding bit and frame sync codewords, the data packet is converted into analog GMSK signals for modulating into the radio transmitter.
In the receive mode, the MX909A performs the reverse function using the analog signals from the receivers discriminator. After error correction and removal of the packet overhead, the recovered application data is supplied to the host C. Any CRC detected residual uncorrected errors in the data will be flagged. Readout of the SNR value during receipt of a packet is also provided.
The MX909A uses data block sizes and FEC/CRC algorithms compatible with the MobitexTM Wide Area Network over-air standard. The format used is suitable for other private applications where the high-speed transfer of data over narrow-band wireless links is required. The MX909A is programmable to operate at standard bit-rates from a wide choice of XTAL/CLOCK frequencies.
The MX909A may be used with a 3.0V to 5.5V power supply and is available in the following packages: 24-pin SSOP (MX909ADS), 24-pin SOIC (MX909ADW), 24-pin PLCC (MX909ALH), and 24-pin PDIP (MX909AP).
MX909A Maximum Ratings
Exceeding these maximum ratings can result in damage to the device. Operation of the device outside the operating limits is not implied
| General |
Min. |
Max. |
Units |
| Supply (VDD - VSS ) |
-0.3 |
7.0 |
V |
| Voltage on any pin to VSS |
-0.3 |
VDD+ 0.3 |
V |
| Current | |||
| VDD |
-30 |
30 |
mA |
| VSS |
-30 |
30 |
mA |
| Any other pin |
-20 |
20 |
mA |
| DW, LH, P Package | |||
| Total Allowable Power Dissipation at TAMB = 25 |
800 |
mW | |
| Derating above 25 |
13 |
mW/ above 25 | |
| Storage Temperature |
-55 |
125 |
|
| Operating Temperature |
-40 |
85 |
|
| DS Package | |||
| Total Allowable Power Dissipation at TAMB = 25 |
550 |
mW | |
| Derating above 25 |
9 |
mW/ above 25 | |
| Storage Temperature |
-55 |
125 |
|
| Operating Temperature |
-40 |
85 |
MX909A Features
` GMSK Modulation
` RX or TX up to 19.2k bits/sec
` Full Data Packet Framing
` MobitexTMCompatible
` Flexible Operating Modes
` Host C Interface
` Low Power 3.3V/5.0V Operation
` 24-Pin Small Form Package Option
` RX or TX up to 19.2k bits/sec
` Full Data Packet Framing
` MobitexTMCompatible
` Flexible Operating Modes
` Host C Interface
` Low Power 3.3V/5.0V Operation
` 24-Pin Small Form Package Option
MX909A
PDF/DataSheet Download
- Datasheet: MX909A
- File Size: 368907 KB
- Manufacturer: CMLMICRO [CML Microcircuits]
- Click here to Download
- ·MX909ADW
- CMLMICRO [CML Microcircuits]
- GMSK Modem Data Pump
- 368907 KB
- ·MX909AP
- CMLMICRO [CML Microcircuits]
- GMSK Modem Data Pump
- 368907 KB
- ·MX919B
- CMLMICRO [CML Microcircuits]
- 4-Level FSK Modem Data Pump
- 977860 KB
- ·MX919BDS
- CMLMICRO [CML Microcircuits]
- 4-Level FSK Modem Data Pump
- 977860 KB
- ·MX919BDW
- CMLMICRO [CML Microcircuits]
- 4-Level FSK Modem Data Pump
- 977860 KB
- ·MX919BLH
- CMLMICRO [CML Microcircuits]
- 4-Level FSK Modem Data Pump
- 977860 KB
- ·MX919BP
- CMLMICRO [CML Microcircuits]
- 4-Level FSK Modem Data Pump
- 977860 KB
- ·MX919J
- MODEM
- 2326377 KB
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