欧美在线一二三_亚洲天天在线观看_国内精品久久久_美女视频污_亚州激情_麻豆免费在线_夜夜骑夜夜_欧美日韩一二区_羞羞的视频在线观看_国产AV亚洲AV麻豆专区_成人一级视频_强videoshd酒醉_天天操夜夜骑_免费播放毛片_午夜三级在线

The LT?5554 is a 7-bit digitally controlled programmable gain (PG) amplifi er with 16dB gain control range. It consists of a 50Ω input variable attenuator, followed by a high linearity variable transconductance amplifi er. The coarse 4dB input attenuator step is implemented via 2-bits of digital control (PG5, PG6). The fi ne transconductance amplifi er 0.125dB step within 3.875dB gain control range is set via 5-bits digital control (PG0 to PG4). The LT5554 gain control inputs (PGx) and the STROBE input can be directly coupled to TTL or ECL drivers. The seven parallel gain control inputs time skew can be eliminated by using the STROBE input positive transition.