有没有比PGA204精度更好的程控放大器啊？？？

什么应用？

可以看下PGA280 Zerø-Drift Programmable Gain Instrumentation Amplifier:

• WIDE INPUT RANGE: ±15.5V at ±18V SUPPLY
• BINARY GAIN STEPS: 128V/V to 1/8V/V
• ADDITIONAL SCALING FACTOR: 1V/V and 1⅜V/V
• LOW OFFSET VOLTAGE: 3µV at G = 128
• NEAR-ZERO LONG-TERM DRIFT OF OFFSET VOLTAGE
• NEAR-ZERO GAIN DRIFT: 0.5ppm/°C
• EXCELLENT LINEARITY: 1.5ppm
• EXCELLENT CMRR: 140dB
• HIGH INPUT IMPEDANCE
• VERY LOW 1/f NOISE

http://www.ti.com.cn/cn/lit/ds/symlink/pga280.pdf

可以看下PGA的选型指南，根据自己实际应用情况进行筛选：

http://www.ti.com/lsds/ti/amplifiers/pga-vga/pga-vga-products.page#p3229=PGA