User's Manual

9/29/2004 OV4F2
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User Manual BCM2035
04/23/03
Broadcom Corporation
Document 2035-UM100-R BCM2035 Usage Models Page 19
Section 3: BCM2035 Usage Models
MOBILE PHONE USAGE MODEL
The BCM2035 is designed to directly interface with new and existing handset designs as shown in Figure 4.
The
BCM2035 has a very flexible PCM and UART interfaces, enabling it to transparently connect with the
existing circuits. In addition, the TCXO and external LPO inputs allow the use of existing features of the
handset to further minimizing the size, power, and cost of the integration.
The
BCM2035 incorporates a number of unique features to accommodate the integration into mobile phone
platforms.
1. The PCM interface and UART interface have separate power domains allowing the BCM2035 to interface
with two separate devices with different interface voltage requirements.
2. The PCM interface provides multiple modes of operation to support both master and slave as well as
hybrid interfacing to single or multiple external codec devices.
3. The UART interface supports both hardware and software flow based flow control and with tight
integration with power control side band signaling to support the lowest power operation.
4. The TCXO interface accommodates any of the typical reference frequencies used by cell phones.
5. A programmable TCXO power-up or power-down signal (active high or active low) allows the device to
interface with TCXO devices with different start-up times.
6. Both the TCXO and external LPO inputs are high impedance inputs that have minimal loading on the
driving source regardless of if the BCM2035 has power applied to it or power has been removed.
7. The internal power control on the transceiver power amplifier can be offset to a lower output power, saving
25% over the normal transmit power consumption.
8. The highly linear design of the radio transceiver ensures that the device has the lowest output spurious
emissions regardless of the state of operation and has been fully characterized in the global cellular
bands.
9. The transceiver design has excellent blocking (eliminating desensitization of the Bluetooth receiver) and
intermodulation performance (distortion of the transmitted signal caused by the mixing of the cellular and
Bluetooth transmissions) in the presence of any cellular transmission (GSM, GPRS, CDMA, WCDMA, or
iDEN). Minimal external filtering is required for integration inside the handset.
10. Minimal external components are required for integration and very compact packaging is available,
eliminating the need for modules