PGA870中文资料高速全差分可编程增益放大器数据手册TI规格书

描述 Description

The PGA870 is a wideband programmable-gain amplifier (PGA) for high-speed signal chain and data acquisition systems. The PGA870 has been optimized to provide high bandwidth, low distortion, and low noise, making it ideally suited as a 14-bit analog-to-digital converter (ADC) driver for wireless base station signal chain applications. The wide gain range of –11.5 dB to +20 dB can be adjusted in 0.5-dB gain steps through a 6-bit control word applied to the parallel interface. The gain control interface may be configured as a level-triggered latch or an edge-triggered latch, or it may be placed in an unlatched (transparent) mode. In addition to the 6-bit gain control, the PGA870 contains a power-down pin (PD) that can be used to put the device into a low-current, power-down mode. In this mode, the quiescent current drops to 2 mA, but the gain control circuitry remains active, allowing the gain of the PGA870 to be set before device power-up. The PGA870 is offered in a QFN-28 PowerPAD™ package.

特性 Features

• Wideband +5-V Operation: 650-MHz Bandwidth
• Wide Gain Range: –11.5 dB to +20 dB
• HD2: –93 dBc at 100 MHz
• IMD3: –98 dBc at 100 MHz, –95 dBc at 200 MHz
• Flexible Gain Control Interface:
• Gain may be set in power-down state
• Low Disable Current: 2 mA
• APPLICATIONS
• Programmable Gain IF Amplifier:
• Single-ended to differential conversion
• Fast Gain Control Loops for:
• Digital radio signal chains
• ADC Driver for Wireless Base Station Signal Chains: GSM, WCDMA, MC-GSM
• Radar/Ranging Systems
PowerPAD is a trademark of Texas Instruments. All other trademarks are the property of their respective owners.