Texas Instruments TRF1500 Manuale Utente

TRF1500 Integrated Dual-Band RF Receiver User’s Guide

17

The TRF1500 operates in 18 different states: The control code
and active circuits are given in Table 2.

Table 2.  Control State and the Corresponding Active Circuits

000000

Sleep Mode

010000

Low-Band LO Input Buffer On

LB LO Buffer

011000

Low-Band Receive Normal

LB LO Buffer, LB LNA, LB Mixer

011010

Low-Band Receive Strong Signal

LB LO Buffer, LB Mixer

010100

Low-Band Transmit Mixer

LB LO Buffer, LB TX Mixer

011100

Low-Band Receive and Transmit Mixer

LB LO Buffer, LB LNA (On High), LB Mixer, LB TX
Mixer

011110

Low-Band Transmit Mixer

LB LO Buffer, LB LNA (On High), LB Mixer

010001

Doubler On

LB LO Buffer, Frequency Doubler, HB LO Buffer

011001

Low-Band Receive Normal, Doubler On

LB LO Buffer, LB LNA, LB Mixer, Frequency
Doubler

011011

Low-Band Receive Strong Signal, Doubler
On

LB LO Buffer, LB Mixer, Frequency Doubler

011111

Low-Band Transmit, Doubler On

LB LO Buffer, LB LNA (On High), LB Mixer, LB TX
Mixer

111011

High-Band Receive Strong Signal, Doubler
On

HB LO Buffer, HB Mixer, Frequency Doubler

110000

High-Band LO Input Buffer On

HB LO Buffer

111000

High-Band Receive Normal

HB LO Buffer, HB LNA, HB Mixer

111010

High-Band Receive Strong Signal

HB LO Buffer, HB Mixer

111001

High-Band Receive Frequency, Doubler On

LB LO Buffer, HB LO Buffer, HB LNA, HB Mixer,
Frequency Doubler

110100

High-Band Transmit Normal

HB LO Buffer, HB TX Mixer

110101

High-Band Transmit Frequency,  Doubler
On

HB LO Buffer, HB TX Mixer, Frequency Doubler,
LB LO Buffer