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SiW1711
60 0047 R00Grf SiW1711 Radio Modem IC DS
Description
The following figure shows the SiW1711 Radio Modem functional block diagram. During the receive process, the radio sig-
nal is taken from the single ended RF input pin that feeds into the low noise amplifier (LNA). The signal from the LNA is
directly down-converted to I/Q baseband, filtered with an anti-aliasing filter, and converted to digital with a high resolution
analog-to-digital converter. The critical channel filtering is done in the digital domain for stable and repeatable perfor-
mance. The signal is then processed by a high performance GFSK demodulator. The demodulator is programmable to
support baseband ICs from multiple OEMs. Within the demodulator, data detection and timing recovery circuits convert
the data for transfer to an external device. In addition, the IC has multiple internal self-calibration circuits to maintain stable
and repeatable performance from part-to-part as well as over the full temperature range.
The IC has two fully integrated regulators: one for the radio (analog regulator) and one for the digital logic (digital regula-
tor). The digital regulator can be used to supply a Bluetooth baseband controller.
Note: Both regulators can be bypassed if external regulation is desired. When bypassing the analog regulator, the
VBATT_ANA and VCC_OUT pins must be tied together and the external analog voltage (1.8 V) should be applied to the
VBATT_ANA pin. When bypassing the digital regulator, the VBATT_DIG pin should be left unconnected and the external
digital voltage (1.8 V) should be applied to VBB_OUT pin.
The IC also provides power on reset and glitch-free clock start-up. A reference PLL can be enabled to support a number of
different reference frequencies.
Digital control functions and a programming interface provide radio modem control and a flexible interface to external Blue-
tooth link controllers.
Radio Interface
The RF_IN and RF_OUT signals are combined using a simple matching circuit and then connected to a filter and the
antenna. The signals are single-ended to save the cost and space of a balun.
An internal power control loop maintains a very stable RF_OUT signal level over the full temperature range and from part
to part. This means predictable and repeatable range at any temperature.
For class 1 operation, the TX_RX_SWITCH and IDAC signals can be used to control a RX/TX switch and the gain of an
external PA. This interface is programmable. Features include control of signal polarity, 3 modes of gain control and full
programmability to linearize the PA gain control curve.
Modem Interface
The modem interface transfers the Bluetooth data between the SiW1711 Radio Modem and an external controller. For ref-
erence purposes, the pin description table provides a brief description of typical interface modes.
Clock Signals
Multiple reference clock frequencies (using either a crystal or an external reference source) can be used as a reference for
the RF circuits, to synthesize clocks for most of the internal digital circuits, and to supply external processors with timing
signals.
Serial Programming Interface (SPI)
The serial programming interface (SPI) is used to access the internal registers of the SiW1711 Radio Modem. The SPI is
a synchronous serial interface that can be clocked to speeds up to 8 MHz.
Host I/F
SPI
Modem I/F
& Data
Ext Power
Single-ended LNA
and Downconverter
Single-ended Driver
and Upconverter
ADC
DAC
Radio
Programming
and Control
GFSK
Demodulator
GFSK
Modulator
Reference
PLL
Modem
Clock
Generator
XTAL
Circuit
Analog
Regulator
Digital
Regulator
SiW1711 Radio Modem
SiW1750 or SiW1760
(or any compatible
Bluetooth controller)
Baseband
Bluetooth Subsystem Using the SiW1711 Radio Modem
Reference Clock
or
Crystal Input
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