参数资料
| 型号： | AD7849CNZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 6/20页 |
| 文件大小： | 0K |
| 描述： | IC DAC 16BIT SERIAL INP 20DIP |
| 产品培训模块： | Data Converter Fundamentals DAC Architectures |
| 标准包装： | 18 |
| 设置时间： | 7µs |
| 位数： | 16 |
| 数据接口： | 串行 |
| 转换器数目： | 1 |
| 电压电源： | 模拟和数字，双 ± |
| 功率耗散（最大）： | 100mW |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 通孔 |
| 封装/外壳： | 20-DIP（0.300"，7.62mm） |
| 供应商设备封装： | 20-PDIP |
| 包装： | 管件 |
| 输出数目和类型： | 1 电压，单极；1 电压，双极 |
| 采样率（每秒）： | 143k |
AD7849
Rev. C | Page 14 of 20
Unipolar Configuration
configuration. The DAC is driven by the AD586, 5 V reference.
Because ROFS is tied to 0 V, the output amplifier has a gain of ×2,
and the output range is 0 V to 10 V. If a 0 V to 5 V range is
required, ROFS should be tied to VOUT, configuring the output
stage for a gain of ×1. Table 7 gives the code table for the circuit
shown in Figure 20.
ROFS
VDD
VCC
VREF+
VOUT
(0V TO 10V)
AGND
VREF–
VSS
–15V
AD7849*
R1
10k
AD586
C1
1nF
SIGNAL GND
6
8
4
5
*ADDITIONAL PINS OMITTED FOR CLARITY.
2
DGND
+15V
+5V
01
00
8-
02
1
Figure 20. Unipolar Binary Operation
Table 7. Code Table for Figure 20
Binary Number in DAC Latch
MSB
LSB
Analog Output (VOUT)
1111 1111 1111 1111
10 (65,535/65,536) V
1000 0000 0000 0000
10 (32,768/65,536) V
0000 0000 0000 0001
10 (1/65,536) V
0000 0000 0000 0000
0 V
10 V/65,536 = 152 μV.
Offset and gain can be adjusted in Figure 20 as follows:
To adjust offset, disconnect the VREF input from 0 V, load the
DAC with all 0s, and adjust the VREF voltage until VOUT = 0 V.
To adjust gain, load the AD7849 with all 1s and adjust R1
until VOUT = 10 (65,535/65,536) = 9.9998474 V for the 16-bit,
B and C versions. For the 14-bit A version, VOUT should be
10 (16,383/16,384) = 9.9993896 V.
If a simple resistor divider is used to vary the VREF voltage, it is
important that the temperature coefficients of these resistors
match that of the DAC input resistance (300 ppm/°C). Otherwise,
extra offset errors will be introduced over temperature. Many
circuits do not require these offset and gain adjustments. In
these circuits, R1 can be omitted. Pin 5 of the AD586 may be
Bipolar Configuration
The AD588 provides precision ±5 V tracking outputs that are
Full-scale and bipolar-zero adjustment are provided by varying
the gain and balance on the AD588. R2 varies the gain on the
AD588, while R3 adjusts the +5 V and 5 V outputs together
with respect to ground.
VOUT
(–10V TO +10V)
+15V
+5V
VDD
VCC
VREF+
VOUT
ROFS
AGND
DGND
VREF–
VSS
–15V
AD7849*
SIGNAL
GND
*ADDITIONAL PINS OMITTED FOR CLARITY
AD588
C1
1F
R2
100k
R3
100k
R1
39k
6
15
2
8
5
14
7
9
3
1
10
12
11
4
13
16
01
008-
022
Figure 21. Bipolar ±10 V Operation
Table 8. Code Table for Figure 21
Binary Number in DAC Latch
MSB
LSB
Analog Output (VOUT)
1111 1111 1111 1111
+10 (32,767/32,768) V
1000 0000 0000 0001
+10 (1/32,768) V
1000 0000 0000 0001
0 V
0111 1111 1111 1111
10 (1/32,768) V
0000 0000 0000 0000
10 (32,768/32,768) V
For bipolar-zero adjustment on the AD7849, load the DAC with
100 … 000 and adjust R3 until VOUT = 0 V. Full scale is adjusted
by loading the DAC with all 1s and adjusting R2 until VOUT =
9.999694 V.
When bipolar-zero and full-scale adjustment are not needed,
omit R2 and R3, connect Pin 11 to Pin 12 on the AD588 and
leave Pin 5 on the AD588 floating.
If a ±5 V output range is desired with the circuit shown in
output gain stage to unity and giving an output range of ±5 V.
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