LT5514

Features:

  Output IP3 at 100MHz: 47dBm
  Maximum Output Power: 21dBm
  Bandwidth: LF to 850MHz
  Propagation Delay: 0.8ns
  Maximum Gain: 33dB
  Noise Figure: 7.3dB (Max Gain)
  Gain Control Range: 22.5dB
 Gain Control Step: 1.5dB
  Gain Control Settling Time: 500ns
  Output Noise Floor: 134dBm/Hz (Max Gain)
  Reverse Isolation: 80dB
  Single Supply: 4.75V to 5.25V
  Low Power Mode
  Shutdown Mode
  Enable/Disable Time: 1ms
  Differential I/O Interface
 20-Lead TSSOP Package


Application

 High Linearity ADC Driver
  IF Sampling Receivers
  VGA IF Power Amplifier
  50W Driver
 Instrumentation Applications


Pinout




Specifications

(Notes 1, 2)
Power Supply Voltage (VCC1, VCC2) .......................... 6V
Output Supply Voltage (OUT+, OUT) ....................... 8V
Control Input Voltage (ENA, ENB, PGAx) .. 0.5V to VCC
Signal Input Voltage (IN+, IN) ................... 0.5V to 3V
Operating Ambient Temperature Range ..  40°C to 85°C
Storage Temperature Range ................. 65°C to 150°C
Lead Temperature (Soldering, 10 sec).................. 300°C

Description

The LT®5514 is a programmable gain amplifier (PGA) with bandwidth extending from low frequency (LF) to 850MHz. It consists of a digitally controlled variable attenuator, followed by a high linearity amplifier. The amplifier is configured with two identical transconductance amplifiers, hard wired in parallel with individual dedicated enable pins. When both amplifiers are enabled (Standard mode), the LT5514 offers an OIP3 of +47dBm (at 100MHz). Power dissipation can be reduced when a single amplifier is enabled (Low Power mode). Four parallel digital inputs control the gain over a 22.5dB range with 1.5dB step esolution. An on-chip power supply regulator/filter helps isolate the amplifier signal path from external noise sources.

The LT5514's open-loop architecture offers stable operationf or any practical load conditions, including peakingfree AC response when driving capacitive loads, and excellent reverse isolation.

The LT5514 may be operated broadband, where the output differential RC time constant sets the bandwidth, or it
may be used as a narrowband driver with the appropriate output filter.