参数资料
型号: AD9776A-DPG2-EBZ
厂商: Analog Devices Inc
文件页数: 38/56页
文件大小: 0K
描述: BOARD EVALUATION FOR AD9776A
标准包装: 1
系列: *
DAC 的数量: 2
位数: 12
采样率(每秒): 1G
数据接口: 并联
DAC 型: 电流
工作温度: -40°C ~ 85°C
已供物品: *
已用 IC / 零件: AD9776A
AD9776A/AD9778A/AD9779A
Rev. B | Page 43 of 56
FULL-SCALE CURRENT GENERATION
I DAC
DAC FULL-SCALE
REFERENCE
CURRENT
SCALING
I DAC GAIN
Q DAC GAIN
Q DAC
AD9776A/AD9778A/AD9779A
VREF
10k
1.2V BAND GAP
0.1F
I120
06452
-073
INTERNAL REFERENCE
Full-scale current on the I DAC and Q DAC can be set from
8.66 mA to 31.66 mA. Initially, the 1.2 V band gap reference is
used to set up a current in an external resistor connected to I120
(Pin 75). A simplified block diagram of the reference circuitry is
shown in Figure 76. The recommended value for the external
resistor is 10 kΩ, which sets up an IREFERENCE in the resistor of
120 μA, which in turn provides a DAC output full-scale current
of 20 mA. Because the gain error is a linear function of this resistor,
a high precision resistor improves gain matching to the internal
matching specification of the devices. Gain drift over temperature
is also affected by this resistor. A resistor with a low temperature
coefficient is recommended in applications requiring good gain
stability.
Figure 76. Reference Circuitry
35
0
1000
DAC GAIN CODE
I FS
(m
A
)
30
25
20
15
10
5
200
400
600
800
06
45
2-
07
4
Internal current mirrors provide a current-gain scaling, where
the I DAC or Q DAC gain is a 10-bit word in the 3-wire interface
port register (Register 0x0B, Register 0x0C, Register 0x0F, and
Register 0x10). The default value for the DAC gain registers
gives an IFS of approximately 20 mA. IFS is equal to
32
1024
6
12
27
V
1.2
×
×
+
×
=
DAC Gain
R
I
FS
Figure 77. IFS vs. DAC Gain Code
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