Overview
The LMH6521SQ/NOPB, produced by Texas Instruments, is a high-performance dual digitally controlled variable gain amplifier (DVGA). This device is designed for narrowband and wideband intermediate frequency sampling applications, offering exceptional gain and phase matching between channels. The LMH6521 features two independent channels, each with a digitally controlled attenuator followed by a high linearity, differential output amplifier. This configuration ensures low distortion and maximum system design flexibility, 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 step size) | ||
| 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 |
| Operating Temperature Range | -40 | 85 | °C | |
| Package Type | 32-Pin WQFN |
Key Features
- High linearity and low distortion, making it suitable for driving analog-to-digital converters.
- Digitally controlled attenuator with 0.5-dB gain steps over a 31.5-dB range.
- Three gain control modes: parallel interface, serial interface (SPI), and pulse mode interface.
- Independent channel power down and high-speed power down mode.
- 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.
- Low power dissipation and thermally-enhanced 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 a 0.5-dB step size.
- What are the gain control modes available for the LMH6521?
The LMH6521 supports parallel interface, serial interface (SPI), and pulse mode interface.
- What is the operating temperature range of the LMH6521?
The operating temperature range is -40°C to +85°C.
- What is the package type of the LMH6521?
The LMH6521 comes in a 32-Pin WQFN package.
- What are some typical applications of the LMH6521?
Typical applications include cellular base stations, wideband and narrowband IF sampling receivers, wideband direct conversion, digital pre-distortion, and ADC drivers.
- What is the -3-dB bandwidth of the LMH6521?
The -3-dB bandwidth is 1200 MHz.
- How does the LMH6521 manage power consumption?
The LMH6521 has independent channel power down and a high-speed power down mode to manage power consumption efficiently.
- What is the noise figure at maximum gain for the LMH6521?
The noise figure at maximum gain is 7.3 dB.
- What is the OIP3 at 200 MHz for the LMH6521?
The OIP3 at 200 MHz is 48.5 dBm.
