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参数资料
| 型号： | AD6654CBCZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 28/88页 |
| 文件大小： | 0K |
| 描述： | IC ADC 14BIT W/4CH RSP 256CSPBGA |
| 标准包装： | 1 |
| 位数： | 14 |
| 采样率（每秒）： | 92.16M |
| 数据接口： | 串行，并联 |
| 转换器数目： | 1 |
| 功率耗散（最大）： | 2.5W |
| 电压电源： | 模拟和数字 |
| 工作温度： | -25°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 256-BGA，CSPBGA |
| 供应商设备封装： | 256-CSPBGA（17x17） |
| 包装： | 托盘 |
| 输入数目和类型： | 1 个差分，单极 |
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AD6654
Rev. 0 | Page 34 of 88
NUMERICALLY CONTROLLED OSCILLATOR (NCO)
Each channel consists of an independent complex NCO and a
complex mixer. This processing stage is comprised of a digital
tuner consisting of three multipliers and a 32-bit complex NCO.
The NCO serves as a quadrature local oscillator capable of
producing an NCO frequency of between –CLK/2 and +CLK/2
with a resolution of CLK/232 in the complex mode, where CLK
is the input clock frequency.
The frequency word used for generating the NCO is a 32-bit
word. This word is used to generate a 20-bit phase word. A
16-bit phase offset word is added to this phase word. 18 bits of
this phase word are used to generate the sine and cosine of the
required NCO frequency. The amplitude of the sine and cosine
are represented using 17 bits. The worst-case spurious signal
from the NCO is better than 100 dBc for all output
frequencies.
Because all the filtering in the AD6654 is low-pass filtering, the
carrier of interest is tuned down to dc (frequency = 0 Hz). This
is illustrated in Figure 47. Once the signal of interest is tuned
down to dc, the unwanted adjacent carriers can be rejected
using the low-pass filtering that follows.
NCO FREQUENCY
The NCO frequency value is given by the 32-bit twos comple-
ment number entered in the NCO frequency register.
Frequencies between CLK/2 and +CLK/2 (with +CLK/2
excluded) are represented using this frequency word:
0x8000 0000 represents a frequency given by CLK/2.
0x0000 0000 represents dc (frequency is 0 Hz).
0x7FFF FFFF represents CLK/2 CLK/232.
The NCO frequency word can be calculated using following the
equation:
(
)
CLK
CH
f
FREQ
NCO
,
mod
2
_
32
=
where:
NCO_FREQ
is the 32-bit twos complement number represent-
ing the NCO frequency register.
fCH
is the desired carrier frequency.
fCLK
is the clock rate for the channel under consideration.
mod( ) is a remainder function. For example, mod(110, 100) =
10 and, for negative numbers, mod(32, 10) = 2.
Note that this equation applies to the aliasing of signals in the
digital domain (that is, aliasing introduced when digitizing
analog signals).
For example, if the carrier frequency is 100 MHz and the clock
frequency is 80 MHz,
(
)
25
.
0
80
20
,
mod
=
CLK
DK
CH
f
This, in turn, converts to 0x4000 0000 in the 32-bit twos
complement representation for NCO_FREQ.
05156-036
NCO TUNES SIGNAL TO
SIGNAL OF INTEREST
AFTER FREQUENCY TRANSLATION
SIGNAL OF INTEREST
SIGNAL OF INTEREST IMAGE
–fs/2
–7fs/16
–3fs/8
–5fs/16
–fs/4
–3fs/16
–fs/8
–fs/16
DC
fs/16
fs/8
3fs/16
fs/4
5fs/16
3fs/8
7fs/16
fs/2
–fs/2
–7fs/16
–3fs/8
–5fs/16
–fs/4
–3fs/16
–fs/8
–fs/16
DC
fs/16
fs/8
3fs/16
fs/4
5fs/16
3fs/8
7fs/16
fs/2
FREQUENCY TRANSLATION (SINGLE 1MHz CHANNEL TUNED TO BASEBAND)
WIDEBAND INPUT SPECTRUM (30MHz FROM HIGH SPEED ADC)
WIDEBAND INPUT SPECTRUM (–fsample/2 TO +fsample/2)
Figure 47. Frequency Translation Principle Using the NCO and Mixer
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相关代理商/技术参数 |
参数描述 |
|---|---|
| AD6654XBCZ | 制造商:Analog Devices 功能描述:14-BIT, 92.16 MSPS, 4 & 6-CHANNEL WIDEBAND IF TO BASE BAND R - Bulk |
| AD6655 | 制造商:AD 制造商全称:Analog Devices 功能描述:IF Diversity Receiver |
| AD6655-125EBZ | 功能描述:BOARD EVAL W/AD6655 & SOFTWARE RoHS:是 类别:RF/IF 和 RFID >> RF 评估和开发套件，板 系列:- 标准包装:1 系列:- 类型:GPS 接收器 频率:1575MHz 适用于相关产品:- 已供物品:模块 其它名称:SER3796 |
| AD6655-125EBZ1 | 制造商:AD 制造商全称:Analog Devices 功能描述:IF Diversity Receiver |
| AD6655-150EBZ | 功能描述:BOARD EVAL FOR 150MSPS AD6655 RoHS:是 类别:RF/IF 和 RFID >> RF 评估和开发套件，板 系列:- 标准包装:1 系列:- 类型:GPS 接收器 频率:1575MHz 适用于相关产品:- 已供物品:模块 其它名称:SER3796 |
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