Description

100M-4GHz Variable Gain Amplifier RF IF Digitally Controlled VGA ADL5240 + STM32 + 1.3" TFT

ADL5240:
Description:
The ADL5240 is a high performance, digitally controlled variable gain amplifier (VGA) operating from 100 MHz to 4000 MHz. The VGA integrates a high performance, 20 dB gain, internally matched amplifier (AM P) with a 6-bit digital step attenuator (DSA) that has a gain control range of 31.5 dB in 0.5 dB steps with ±0.25 dB step accuracy. The attenuation of the DSA can be controlled using a serial or parallel interface.Both the gain block and DSA are internally matched to 50 Ω at their inputs and outputs and are separately biased. The separate bias allows all or part of the ADL5240 to be used, which facilitates easy reuse throughout a design. The pin out of the ADL5240 also enables either the gain block or DSA to be first, giving the VGA maximum flexibility in a signal chain. The ADL5240 consumes just 93 mA and operates from a single supply ranging from 4.75 V to 5.25V. The VGA is packaged in a thermally efficient, 5 mm × 5 mm, 32-lead LFCSP and is fully specified for operation from −40°C to +85°C. A fully populated evaluation board is available.

Features:
- Operating frequency: 100 MHz to 4000 MHz (100M to 4GHz )
- Digitally controlled VGA with serial and parallel interfaces
- 6-bit, 0 .5 dB digital step attenuator
- Gain control range: 31.5 dB; Step accuracy: ±0 .2 5 dB

Gain Module Amplifier Specifications:
- Gain: 19.7 dB (2.14 GHz)
- OIP3: 41.0 dBm (2.14 GHz)
- P1dB: 19.5 dBm (2.14 GHz)
- Noise figure: 2.9 dB (2.14 GHz)

- Can set gain module or digital step attenuator as the first
- Powered by single power supply from 4.75 V to 5.25 V
- Low quiescent current: 93 mA
- High heat dissipation performance 5mm x 5mm, 32-pin LFCSP packaging
- The companion ADL5243 integrates a 1/4 W driver amplifier to drive gain module and the output of DSA

Applications:
- Wireless infrastructure
- Automated test equipment
- RF/IF gain control


Module Parameters:
- Power supply: + 5V
- Frequency range: 100MHZ-4GHZ
- Digital control attenuator attenuation range: 0-31.5DB
- Gain of fixed gain amplifier: 20DB
- Flatness and insertion loss: refer to the actual measured S21 parameters
- PCB board layers: four layers; with metal shield box

Package Included:
- 1 x Variable Gain Amplifier

Measured S21 Parameters:
Fixed amplifier measured S21 parameters


Program-controlled gain attenuator measured S21 parameters (0DB)


Program-controlled gain attenuator measured S21 parameters (10DB)


Program-controlled gain attenuator measured S21 parameters (20DB)


Program-controlled gain attenuator measured S21 parameters (30DB)


Reference PDF schematic (provided after purchasing)

Parallel and Serial Port Protocol Control:
/*The chip will using GPIO to Init*/

void ADL5240_Init(void)

{

GPIO_InitTypeDef GPIO_InitStruct;

RCC_APB2PeriphClockCmd(RCC_ADL5240 GPIO_ADL5240_L , ENABLE);

#if Communication_Mode

GPIO_InitStruct.GPIO_Pin = GPIO_Pin_ADL5240_CLK GPIO_Pin_ADL5240_DATA;

GPIO_InitStruct.GPIO_Mode = GPIO_Mode_Out_PP;

GPIO_InitStruct.GPIO_Speed = GPIO_Speed_50MHz;

ADL5240_D3_Clr();

ADL5240_D4_Clr();

ADL5240_D5_Clr();

ADL5240_LSB_Set();

GPIO_Init(GPIO_ADL5240,&GPIO_InitStruct);

GPIO_InitStruct.GPIO_Pin = GPIO_Pin_ADL5240_LE;

GPIO_InitStruct.GPIO_Mode = GPIO_Mode_Out_PP;

GPIO_InitStruct.GPIO_Speed = GPIO_Speed_50MHz;

GPIO_Init(GPIO_ADL5240_G,&GPIO_InitStruct);

#else

GPIO_InitStruct.Pin = GPIO_Pin_ADL5240_D1 GPIO_Pin_ADL5240_D2 GPIO_Pin_ADL5240_D3

GPIO_Pin_ADL5240_D4 GPIO_Pin_ADL5240_D5 GPIO_Pin_ADL5240_D6 GPIO_Pin_ADL5240_D0;

GPIO_InitStruct.GPIO_Mode = GPIO_Mode_Out_PP;

GPIO_InitStruct.GPIO_Speed = GPIO_Speed_50MHz;

GPIO_Init(GPIO_ADL5240,&GPIO_InitStruct);

#endif

}

#if Communication_Mode

/* Write a data to ADL5240-serial*/

void ADL5240_Write(uint8_t data)

{

uint8_t i;

//data = 0x7f;

ADL5240_LE_Clr(); //Pull down LE as as staring signal

ADL5240_CLK_Clr();

ADL5240_LE_Set();

delay(10);

ADL5240_LE_Clr(); //Now start to write data

for(i = 0 ; i < 6 ; i ++){

if(data & 0x80)

ADL5240_DATA_Set();

else

ADL5240_DATA_Clr();

ADL5240_CLK_Set();

delay(2);

ADL5240_CLK_Clr();

data <<= 1;

delay(5);

}

// delay(1);

ADL5240_LE_Set();

delay(20);

ADL5240_LE_Clr();

}

#else

/* Write a data to ADL5240-parallel*/

void ADL5240_Write(uint8_t data)

{

if(data & 0x80)

ADL5240_D1_Set();

else

ADL5240_D1_Clr();

data <<= 1;

if(data & 0x80)

ADL5240_D2_Set();

else

ADL5240_D2_Clr();

data <<= 1;

if(data & 0x80)

ADL5240_D3_Set();

else

ADL5240_D3_Clr();

data <<= 1;

if(data & 0x80)

ADL5240_D4_Set();

else

ADL5240_D4_Clr();

data <<= 1;

if(data & 0x80)

ADL5240_D5_Set();

else

ADL5240_D5_Clr();

data <<= 1;

if(data & 0x80)

ADL5240_D6_Set();

else

ADL5240_D6_Clr();

}

#endif