Data Sheet

Page 31
nRF51822 Product Specification v3.1
4 Peripheral blocks
Peripheral blocks which have a register interface and/or interrupt vector assigned are instantiated, one or
more times, in the device address space. The instances, associated ID (for those with interrupt vectors), and
base address of features are found in Table 18 on page 36. Detailed functional descriptions, configuration
options, and register interfaces can be found in the nRF51 Series Reference Manual.
4.1 2.4 GHz radio (RADIO)
The nRF51 series 2.4 GHz RF transceiver is designed and optimized to operate in the worldwide ISM
frequency band at 2.400 to 2.4835 GHz. Radio modulation modes and configurable packet structure enable
interoperability with Bluetooth® low energy (BLE), ANT™, Enhanced ShockBurst™, and other
2.4 GHz protocol implementations.
The transceiver receives and transmits data directly to and from system memory for flexible and efficient
packet data management. The nRF51 series transceiver has the following features:
• General modulation features
•GFSK modulation
• Data whitening
•On-air data rates
• 250 kbps
•1 Mbps
•2 Mbps
• Transmitter with programmable output power of +4 dBm to -20 dBm, in 4 dB steps
• Transmitter whisper mode -30 dBm
• RSSI function (1 dB resolution)
• Receiver with integrated channel filters achieving maximum sensitivity
• -96 dBm at 250 kbps
• -93 dBm at 1 Mbps BLE
•-90 dBm at 1 Mbps
•-85 dBm at 2 Mbps
• RF Synthesizer
• 1 MHz frequency programming resolution
• 1 MHz non-overlapping channel spacing at 1 Mbps and 250 kbps
• 2 MHz non-overlapping channel spacing at 2 Mbps
• Works with low-cost
± 60 ppm 16 MHz crystal oscillators
• Baseband controller
• EasyDMA RX and TX packet transfer directly to and from RAM
• Dynamic payload length
• On-the-fly packet assembly/disassembly and AES CCM payload encryption
• 8 bit, 16 bit, and 24 bit CRC check (programmable polynomial and initial value)
Note: EasyDMA is an integrated DMA implementation requiring no configuration to take advantage
of flexible data management and avoids copying operations to and from RAM.