参数资料
| 型号： | AD6654BBC |
| 厂商： | Analog Devices Inc |
| 文件页数： | 80/88页 |
| 文件大小： | 0K |
| 描述： | IC ADC 14BIT W/6CH 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 81 of 88
CRCF Coefficient Memory
CRCF Memory. This memory has 64 words that have 20 bits
each. The memory contains the CRCF filter coefficients. The
data written to this memory space is 20-bit in twos complement
format. See the Channel RAM Coefficient Filter (CRCF) section
for the method to program the coefficients into the coefficient
memory.
AGC Control Register <10:0>
<10>: Channel Sync Select Bit. When this bit is set, the AGC
uses the sync signal from the channel for its synchronization.
When this bit is cleared, the SYNC pin used for synchronization
is defined by Bit 9 to Bit 8 of this register.
<9:8>: SYNC Pin Select Bits. When Bit 10 of this register is
cleared, these bits specify the SYNC pin used by AGC for
synchronization. These bits are don’t care when Bit 10 of the
AGC control register is set to Logic 1.
Table 39. SYNC Pin Select Bits
AGC Control Bits <9:8>
SYNC Pin Used by AGC
00
SYNC0
01
SYNC1
10
SYNC2
11
SYNC3
<7:5>: AGC Word Length Control Bits. These bits define the
word length of the AGC output. The output word can be 4 to 8,
10, 12, or 16 bits wide. Table 40 shows the possible selections.
Table 40. AGC Word Length Control Bits
AGC Control Bits <7:5>
Output Word Length (Bits)
000
16
001
12
010
10
011
8
100
7
101
6
110
5
111
4
<4>: AGC Mode Bit. When this bit is cleared, the AGC operates
to maintain a desired signal level. When this bit is set, it
operates to maintain a constant clipping level. See the
Automatic Gain Control section for details about these modes.
<3>: AGC Sync Now Bit. This bit is used to synchronize a
particular AGC, regardless of the channel, through the
programming ports (microport or serial port). When this bit is
set, the AGC block updates a new output sample (RSSI sample)
and starts working toward a new update sample.
<2>: Initialize on Sync Bit. This bit is used to determine
whether or not the AGC should initialize on a sync. When this
bit is set, during a synchronization the CIC filter is cleared and
new values for CIC decimation, number of averaging samples,
CIC scale, Signal Gain K, and the Pole P parameter are loaded.
When Bit 2 = 0, the above-mentioned parameters are not
updated, and the CIC filter is not cleared. In both cases, an
AGC update sample is output from the CIC filter and the
decimator starts operating towards the next output sample
whenever a sync occurs.
<1>: First Sync Only. This bit is used to ignore repetitive
synchronization signals. In some applications, the synchroniza-
tion signal occurs periodically. If this bit is cleared, each
synchronization request resynchronizes the AGC. If this bit is
set, only the first occurrence causes the AGC to synchronize
and updates the AGC gain values periodically, depending on
the decimation factor of the AGC CIC filter.
<0>: AGC Bypass Bit. When this bit is set, the AGC section is
bypassed. The N-bit representation from the interpolating half-
band filters is still reduced to a lower bit width representation as
set by Bit 7 to Bit 5 of the AGC control register. A truncation at
the output of the AGC accomplishes this task.
AGC Hold-Off Register <15:0>
The AGC hold-off counter is loaded with the value written to
this address when either a soft sync or pin sync comes into the
channel. The counter begins counting down. When it reaches 1,
a sync is sent to the AGC. This sync might or might not initial-
ize the AGC, as defined by the control word. The AGC loop is
updated with a new sample from the CIC filter whenever a sync
occurs. If this register is Logic 1, the AGC is immediately
updated when the sync occurs. If this register is Logic 0, the
AGC cannot be synchronized.
AGC Update Decimation <11:0>
This 12-bit register sets the AGC decimation ratio from 1 to
4096. An appropriate scaling factor should be set to avoid loss
of bits. The decimation ratio is given by the decimal value of the
AGC update decimation<11:0> register contents plus 1, that is,
12’0x000 describes a decimation ratio of 1, and 12’0xFFF
describes a decimation ratio of 4096.
AGC Signal Gain <11:0>
This register is used to set the initial value for a signal gain used
in the gain multiplier. This 12-bit value sets the initial signal
gain in the range of 0 dB and 96.296 dB in steps of 0.024 dB.
Initial signal gain (SG) in dB should be converted to a register
setting using the following formula:
×
=
256
)
2
(
log
20
10
SG
round
Value
Register
AGC Error Threshold <11:0>
This 12-bit register is the comparison value used to determine
which loop gain value (K1 or K2) to use for optimum operation.
When the magnitude-of-error signal is less than the AGC error
threshold value, then K1 is used; otherwise, K2 is used. The word
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相关代理商/技术参数 |
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| AD6654BBCZ | 功能描述:IC ADC 14BIT W/6CH RSP 256CSPBGA RoHS:是 类别:集成电路 (IC) >> 数据采集 - 模数转换器 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:250 系列:- 位数:12 采样率（每秒）:1.8M 数据接口:并联 转换器数目:1 功率耗散（最大）:1.82W 电压电源:模拟和数字 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:48-LQFP 供应商设备封装:48-LQFP（7x7） 包装:管件 输入数目和类型:2 个单端，单极 |
| AD6654CBC | 功能描述:IC ADC 14BIT W/4CH RSP 256CSPBGA RoHS:否 类别:集成电路 (IC) >> 数据采集 - 模数转换器 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:250 系列:- 位数:12 采样率（每秒）:1.8M 数据接口:并联 转换器数目:1 功率耗散（最大）:1.82W 电压电源:模拟和数字 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:48-LQFP 供应商设备封装:48-LQFP（7x7） 包装:管件 输入数目和类型:2 个单端，单极 |
| AD6654CBCZ | 功能描述:IC ADC 14BIT W/4CH RSP 256CSPBGA RoHS:是 类别:集成电路 (IC) >> 数据采集 - 模数转换器 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:250 系列:- 位数:12 采样率（每秒）:1.8M 数据接口:并联 转换器数目:1 功率耗散（最大）:1.82W 电压电源:模拟和数字 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:48-LQFP 供应商设备封装:48-LQFP（7x7） 包装:管件 输入数目和类型:2 个单端，单极 |
| 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 |
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