米6体育平台手机版

ZHCSNB7A February 2021 – October 2022 ADC3581 , ADC3582 , ADC3583

PRODUCTION DATA

封装选项

机械数据 (封装 | 引脚)

RSB|40
- MPQF185C

散热焊盘机械数据 (封装 | 引脚)

RSB|40
- QFND255H

订购信息

8.3.4.5 Decimation Filter

The ADC358x supports complex decimation by 2, 4, 8, 16 and 32 with a stopband rejection of at least 85 dB and a pass-band bandwidth of ~ 80%. Table 8-3 gives an overview of the pass-band bandwidth of the different decimation settings with respect to ADC sampling rate F_S. In real decimation mode the output bandwidth is half of the complex bandwidth.

Table 8-3 Decimation Filter Summary and Maximum Available Output Bandwidth

REAL/COMPLEX DECIMATION	DECIMATION SETTING N	OUTPUT RATE	OUTPUT BANDWIDTH	OUTPUT RATE (F_S = 65 MSPS)	OUTPUT BANDWIDTH (F_S = 65 MSPS)
Complex	2	F_S / 2 complex	0.8 × F_S / 2	32.5 MSPS complex	26 MHz
	4	F_S / 4 complex	0.8 × F_S / 4	16.25 MSPS complex	13 MHz
	8	F_S / 8 complex	0.8 × F_S / 8	8.125 MSPS complex	6.5 MHz
	16	F_S / 16 complex	0.8 × F_S / 16	4.0625 MSPS complex	3.25 MHz
	32	F_S / 32 complex	0.8 × F_S / 32	2.03125 MSPS complex	1.625 MHz
Real	2	F_S / 2 real	0.4 × F_S / 2	32.5 MSPS	13 MHz
	4	F_S / 4 real	0.4 × F_S / 4	16.25 MSPS	6.5 MHz
	8	F_S / 8 real	0.4 × F_S / 8	8.125 MSPS	3.25 MHz
	16	F_S / 16 real	0.4 × F_S / 16	4.0625 MSPS	1.625 MHz
	32	F_S / 32 real	0.4 × F_S / 32	2.03125 MSPS	0.8125 MHz

The decimation filter responses are normalized to the ADC sampling clock frequency F_S and illustrated in Figure 8-28 to Figure 8-37. They are interpreted as follows:

Each figure contains the filter pass-band, transition band(s) and alias or stop-band(s) as shown in Figure 8-27. The x-axis shows the offset frequency (after the NCO frequency shift) normalized to the ADC sampling rate F_S.

For example, in the divide-by-4 complex setup, the output data rate is F_S / 4 complex with a Nyquist zone of F_S / 8 or 0.125 × F_S. The transition band (colored in blue) is centered around 0.125 × F_S and the alias transition band is centered at 0.375 × F_S. The stop-bands (colored in red), which alias on top of the pass-band, are centered at 0.25 × F_S and 0.5 × F_S. The stop-band attenuation is greater than 85 dB.