Overview
The LMH6521SQX/NOPB, produced by Texas Instruments, is a high-performance dual digitally controlled variable gain amplifier (DVGA). This component is designed for narrowband and wideband intermediate frequency sampling applications, offering exceptional gain and phase matching between channels. The LMH6521 is optimized for accurate 0.5-dB gain steps and low distortion products, making it ideal for driving analog-to-digital converters where high linearity is necessary.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| OIP3 at 200 MHz | 48.5 | dBm | ||
| Maximum Voltage Gain | 26 | dB | ||
| Gain Range | 31.5 | dB (0.5-dB steps) | ||
| Channel Gain Matching | ±0.04 | dB | ||
| Noise Figure at Maximum Gain | 7.3 | dB | ||
| -3-dB Bandwidth | 1200 | MHz | ||
| Supply Voltage | 4.75 | 5 | 5.25 | V |
| Supply Current (Both Channels Enabled) | 225 | mA (TA = 25°C) | ||
| Operating Temperature Range | -40 | 85 | °C | |
| Package Type | WQFN-32 (5x5 mm) |
Key Features
- High-performance dual digitally controlled variable gain amplifiers (DVGA)
- Accurate 0.5-dB gain steps over a 31.5-dB range
- Exceptional gain and phase matching between channels (±0.04 dB gain matching error, ±0.5° phase matching error)
- Low power dissipation and independent channel power down
- Three gain control modes: parallel interface, serial interface (SPI), and pulse mode interface
- Differential output allowing 10-VPPD signal swings on a single 5-V supply
- Low impedance output for maximum flexibility when driving filters or analog-to-digital converters
- Thermally-enhanced 32-pin WQFN package
Applications
- Cellular base stations
- Wideband and narrowband IF sampling receivers
- Wideband direct conversion
- Digital pre-distortion
- ADC drivers
Q & A
- What is the maximum voltage gain of the LMH6521?
The maximum voltage gain of the LMH6521 is 26 dB.
- What is the gain range and step size of the LMH6521?
The gain range is 31.5 dB with 0.5-dB steps.
- What are the key applications of the LMH6521?
The LMH6521 is used in cellular base stations, wideband and narrowband IF sampling receivers, wideband direct conversion, digital pre-distortion, and as ADC drivers.
- What are the gain control modes available for the LMH6521?
The LMH6521 offers three gain control modes: parallel interface, serial interface (SPI), and pulse mode interface.
- What is the operating temperature range of the LMH6521?
The operating temperature range is from -40°C to 85°C.
- What is the package type of the LMH6521?
The LMH6521 is packaged in a thermally-enhanced 32-pin WQFN package.
- What is the noise figure at maximum gain for the LMH6521?
The noise figure at maximum gain is 7.3 dB.
- How does the LMH6521 manage power consumption?
The LMH6521 features low power dissipation and independent channel power down.
- What is the -3-dB bandwidth of the LMH6521?
The -3-dB bandwidth is 1200 MHz.
- What is the supply voltage range for the LMH6521?
The supply voltage range is from 4.75 V to 5.25 V.
