A8291SETTR-TB中文资料ALLEGRO数据手册PDF规格书

Features and Benefits

▪ 2-wire serial I2C™ -compatible interface: control (write) and

status (read)

▪ LNB voltages (16 programmable levels) compatible with

all common standards

▪ Tracking switch-mode power converter for lowest dissipation

▪ Integrated converter switches and current sensing

▪ Provides up to 500 mA load current

▪ Static current limit circuit allows full current at startup and

13→18 V output transition; reliably starts wide load range

▪ Push-pull output stage minimizes 13→18 V and 18→13 V

output transition times for highly capacitive loads

▪ Adjustable rise/fall time via external timing capacitor

▪ Built-in tone oscillator, factory-trimmed to 22 kHz

facilitates DiSEqC™ tone encoding, even at no-load

▪ Four methods of 22 kHz tone generation, via I2C™ data

bits and/or external pin

▪ Filter bypass MOSFET minimizes losses during tone transmit

▪ 22 kHz tone detector facilitates DiSEqC™ 2.0 decoding

▪ Auxiliary modulation input

▪ LNB overcurrent with timer

▪ Diagnostics for output voltage level, input supply UVLO,

and DiSEqC™ tone output

▪ Cable disconnect diagnostic