ADF7901

Features:

Single chip low power UHF transmitter
369.5 MHz to 395.9 MHz frequency operation using Fractional-N  PLL and fully integrated VCO
3.0 V supply voltage
Data rates supported < 2.5 kbps
Low current consumption 26 mA at 12 dBm 
Output at 384 MHz
Power-down mode (< 1 µA)
24-Lead TSSOP package


Pinout




Specifications

V_^DD to GND²                                                           −0.3 V to +4.0 V
RFVDD to GND                                                         −0.3 V to +4.0 V
Digital I/O Voltage to GND                              −0.3 V to VDD + 0.3 V
Operating Temperature Range  
Industrial (B Version)                                                  0°C to +50°C
Storage Temperature Range                                −65°C to +125°C
Maximum Junction Temperature                                             125°C
TSSOP _JA Thermal Impedance                                       150.4°C/W
Lead Temperature, Soldering  
Vapor Phase (60 sec)                                                             235°C
Infrared (15 sec)                                                                    240°C


Description

The ADF7901 is a low power OOK/FSK UHF transmitter designed for use in RF Remote Control Devices. ADF7901 is capable of Frequency Shift Keying (FSK) modulation on 8 different channels, selectable by 3 external control lines. OOK modulation is performed by modulating the PA control line. The on-chip VCO operates at 2 × the output frequency. The divide by 2 at the output of the VCO reduces the amount of PA feedthrough. As a result of this, OOK modulation depths of greater than 50 dB are easily achievable. The FSK_ADJ and ASK_ADJ resistors can be adjusted in the system to optimize output power, for each modulation scheme. An additional 1.5 dB of output power is provided for the lower bank of channels to adjust for antenna performance. The CE line of ADF7901 allows the transmitter to be powered down completely. In this mode, the leakage current is typically 0.1 µA.