atr2434 ATMEL Corporation, atr2434 Datasheet - Page 5

• Manufacturer Part Number: atr2434
• Description: Wirelessusb 2.4-ghz Dsss Radio Soc - Atmel Corporation
• Manufacturer: ATMEL Corporation

32 Chips/Bit Dual Channel
32 Chips/Bit Single Channel
2 × Oversampled
32 Chips/Bit Single Channel
Dual Data Rate (DDR)
Serializer/Deserializer
(SERDES)
Application Interfaces
Clocking and Power
Management
4822C–ISM–09/04
The baseband supports two non-simultaneous data streams each operating at
31.25 kbits/s.
The baseband supports a single data stream operating at 31.25 kbits/s that is sampled
twice as much as the other modes. The advantage of selecting this mode is its ability to
tolerate a noisy environment.
The baseband spreads bits in pairs and supports a single data stream operating at
62.5 kbits/s.
The ATR2434 provides a data Serializer/Deserializer (SERDES), which provides
byte-level framing of transmit and receive data. Bytes for transmission are loaded into
the SERDES and receive bytes are read from the SERDES via the SPI interface. The
SERDES provides double buffering of transmit and receive data. While one byte is
being transmitted by the radio the next byte can be written to the SERDES data register
insuring there are no breaks in transmitted data.
After a receive byte has been received it is loaded into the SERDES data register and
can be read at any time until the next byte is received, at which time the old contents of
the SERDES data register will be overwritten.
The ATR2434 has a fully synchronous SPI slave interface for connectivity to the applica-
tion MCU. Configuration and byte-oriented data transfer can be performed over this
interface. An interrupt is provided to trigger real time events.
An optional SERDES Bypass mode (DIO) is provided for applications that require a syn-
chronous serial bit-oriented data path. This interface is for data only.
A 13-MHz crystal is directly connected to X13IN and X13 without the need for external
capacitors. The ATR2434 has a programmable trim capability for adjusting the on-chip
load capacitance supplied to the crystal. The Radio Frequency (RF) circuitry has on-
chip decoupling capacitors. The ATR2434 is powered from a 2.7 V to 3.6 V DC supply.
The ATR2434 can be shutdown to a fully static state using the PD pin.
Below are the requirements for the crystal to be directly connected to X13IN and X13:
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Nominal frequency: 13 MHz
Operating mode: fundamental mode
Resonance mode: parallel resonant
Frequency stability: ±30 ppm
Series resistance: ≤ 100 Ω
Load capacitance: 10 pF
Drive level: 10 µW to 100 µW
ATR2434 [Preliminary]
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