参数资料
型号: AD9148BBPZRL
厂商: Analog Devices Inc
文件页数: 59/72页
文件大小: 0K
描述: IC DAC 16BIT SPI/SRL 196BGA
标准包装: 1,500
系列: TxDAC+®
设置时间: 20ns
位数: 16
数据接口: 串行,SPI?
转换器数目: 4
电压电源: 单电源
功率耗散(最大): 2.67W
工作温度: -40°C ~ 85°C
安装类型: 表面贴装
封装/外壳: 196-LFBGA 裸露焊盘
供应商设备封装: 196-BGA
包装: 带卷 (TR)
输出数目和类型: 4 电流,单极
采样率(每秒): 1G
AD9148
Data Sheet
Rev. B | Page 62 of 72
Reducing LO Leakage and Unwanted Sidebands
Analog Devices modulators can introduce unwanted signals at
the LO frequency due to dc offset voltages in the I and Q baseband
inputs as well as feedthrough paths from the LO input to the
output. The LO feedthrough can be nulled by applying the correct
dc offset voltages at the DAC output. This can be done either
by using the auxiliary DACs (Register 0x32, Register 0x33,
Register 0x36, and Register 0x37) or by using the digital dc
offset adjustments (Register 0x2C to Register 0x2F). Using the
auxiliary DACs has the advantage that none of the main DAC
dynamic range is used for performing the dc offset adjustment.
The disadvantage is that the common-mode level of the output
signal changes as a function of the auxiliary DAC current. The
opposite is true when the digital offset adjustment is used.
Good sideband suppression requires both gain and phase matching
of the I and Q signals. The phase adjust (Register 0x28 to
Register 0x2B) and gain control (Register 0x50 and Register 0x51)
registers can be used to calibrate I and Q transmit paths to optimize
the sideband suppression. As an alternative to the digital gain
scaling, the DAC full-scale output current (Register 0x30,
Register 0x31, Register 0x34, and Register 0x35) can also be
adjusted to calibrate the I and Q transmit paths; however, changing
the DAC full-scale output current affects the common-mode
voltage level.
For more information on correcting imperfections in IQ
modulators to improve RF signal fidelity, refer to the AN-1039
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AD9148BPCZ 制造商:AD 制造商全称:Analog Devices 功能描述:Quad 16-Bit,1 GSPS, TxDAC+ Digital-to-Analog Converter
AD9148BPCZRL 制造商:AD 制造商全称:Analog Devices 功能描述:Quad 16-Bit,1 GSPS, TxDAC+ Digital-to-Analog Converter
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AD9148-M5372-EBZ 功能描述:BOARD EVAL FOR AD9149, ADL5372 RoHS:是 类别:编程器,开发系统 >> 评估板 - 数模转换器 (DAC) 系列:* 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:1 系列:- DAC 的数量:4 位数:12 采样率(每秒):- 数据接口:串行,SPI? 设置时间:3µs DAC 型:电流/电压 工作温度:-40°C ~ 85°C 已供物品:板 已用 IC / 零件:MAX5581
AD9148-M5375-EBZ 功能描述:BOARD EVAL FOR AD9149, ADL5375 RoHS:是 类别:编程器,开发系统 >> 评估板 - 数模转换器 (DAC) 系列:* 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:1 系列:- DAC 的数量:4 位数:12 采样率(每秒):- 数据接口:串行,SPI? 设置时间:3µs DAC 型:电流/电压 工作温度:-40°C ~ 85°C 已供物品:板 已用 IC / 零件:MAX5581