Datasheet Texas Instruments PGA870 — 数据表

PG A8 70 PGA870
SBOS436A – DECEMBER 2009 – REVISED FEBRUARY 2011 www.ti.com High-Speed, Fully Differential, Programmable-Gain Amplifier
Check for Samples: PGA870 FEATURES 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 PowerPADв„ў
package. 1 23 Wideband +5-V Operation: 650-MHz Bandwidth …