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参数资料
型号： AD9146-M5375-EBZ
厂商： Analog Devices Inc
文件页数： 35/56页
文件大小： 0K
描述： BOARD EVAL FOR AD9146 DAC
设计资源： AD9146-M5375-EBZ Schematic
AD9146-M5375-EBZ Gerber Files
标准包装： 1
系列： TxDAC+®
DAC 的数量： 2
位数： 16
采样率（每秒）： 1G
数据接口： 串行
设置时间： 20ns
DAC 型： 电流
工作温度： -40°C ~ 85°C
已供物品： 板
已用 IC / 零件： AD9146
AD9146
Data Sheet
Rev. A | Page 40 of 56
Figure 52 shows the most basic transmit DAC output circuitry.
A pair of resistors, RO, is used to convert each of the comple-
mentary output currents to a differential voltage output, VOUT.
Because the current outputs of the DAC are high impedance,
the differential driving point impedance of the DAC outputs,
ROUT, is equal to 2 × RO. Figure 53 illustrates the output voltage
waveforms.
RO
VIP +
VIN –
VOUTI
IOUT1P
IOUT1N
RO
VQP +
VQN –
VOUTQ
IOUT2P
IOUT2N
09691-
057
Figure 52. Basic Transmit DAC Output Circuit
+VPEAK
VP
VOUT
VN
VCM
0
–VPEAK
09691-
058
Figure 53. Output Voltage Waveforms
The common-mode signal voltage, VCM, is calculated as
O
FS
CM
R
I
V
×
=
2
The peak output voltage, VPEAK, is calculated as
VPEAK = IFS × RO
With this circuit configuration, the single-ended peak voltage is
the same as the peak differential output voltage.
Transmit DAC Linear Output Signal Swing
To achieve optimum performance, the DAC outputs have a
linear output compliance voltage range that must be adhered
to. The linear output signal swing is dependent on the full-scale
output current, IFS, and the common-mode level of the output.
Figure 54 shows the IMD performance vs. the output common-
mode voltage at different full-scale currents.
–85
–80
–75
–70
–65
–60
–55
–50
0
0.2
0.4
0.6
0.8
1.0
1.2
1.4
IM
D
(
d
Bc)
IFS = 10mA
IFS = 20mA
IFS = 30mA
VCM (V)
09691-
004
Figure 54. IMD vs. Output Common-Mode Voltage (fOUT = 161 MHz,
RLOAD = 50 Differential, IFS = 10 mA, 20 mA, and 30 mA)
AUXILIARY DAC OPERATION
The AD9146 has two auxiliary DACs: one associated with the
I path and one associated with the Q path. These auxiliary DACs
can be used to compensate for dc offsets in the transmitted signal.
Each auxiliary DAC has a single-ended current that can sink or
source current into either the positive (P) or negative (N) out-
put of the associated transmit DAC. The auxiliary DAC
structure is shown in Figure 55.
IOUT1P
IOUT1N
I DAC
VB
I AUX DAC
CURRENT
DIRECTION
I AUX DAC[9:0]
I AUX DAC
SIGN
09691-
061
Figure 55. Auxiliary DAC Structure
The control registers for the I and Q auxiliary DACs are
Register 0x42, Register 0x43, Register 0x46, and Register 0x47.
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