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參數(shù)資料
| 型號： | AD7237JR |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 2/12頁 |
| 文件大小： | 0K |
| 描述： | IC DAC 12BIT LC2MOS DUAL 24SOIC |
| 產(chǎn)品培訓模塊： | Data Converter Fundamentals DAC Architectures |
| 標準包裝： | 1 |
| 系列： | DACPORT® |
| 設置時間： | 8µs |
| 位數(shù)： | 12 |
| 數(shù)據(jù)接口： | 并聯(lián) |
| 轉(zhuǎn)換器數(shù)目： | 2 |
| 電壓電源： | 雙 ± |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 24-SOIC（0.295"，7.50mm 寬） |
| 供應商設備封裝： | 24-SOIC W |
| 包裝： | 管件 |
| 輸出數(shù)目和類型： | 2 電壓，單極；2 電壓，雙極 |
| 采樣率（每秒）： | * |
AD7237A/AD7247A
REV. 0
–10–
APPLYING THE AD7237A/AD7247A
The internal scaling resistors provided on the AD7237A/
AD7247A allow several output voltage ranges. The part can
produce unipolar output ranges of 0 V to +5 V or 0 V to +10 V
and a bipolar output range of
±5 V. Connections for the various
ranges are outlined below. Since each DAC has its own ROFS
input the two DACs on each part can be set up for different
output ranges.
Unipolar (0 V to +10 V) Configuration
The first of the configurations provides an output voltage range
of 0 V to +10 V. This is achieved by connecting the output off-
set resistor, ROFSA, or ROFSB, to AGND (GND for AD7247A).
In this configuration, the AD7237A/AD7247A can be operated
from single or dual supplies. Figure 8 shows the connection dia-
gram for unipolar operation for DAC A of the AD7237A, while
the table for output voltage versus digital code in the DAC latch
is shown in Table III. Similar connections apply to the AD7247A.
Figure 8. Unipolar (0 to +10 V) Configuration
Table III. Unipolar Code Table (0 to +10 V Range)
DAC Latch Contents
MSB
LSB
Analog Output, VOUT
1111 1111 1111
+2 REF IN (4095/4096)
1000 0000 0001
+2 REF IN (2049/4096)
1000 0000 0000
+2 REF IN (2048/4096) = +REF IN
0111 1111 1111
+2 REF IN (2047/4096)
0000 0000 0001
+2 REF IN (1/4096)
0000 0000 0000
0 V
Note: 1 LSB = REF IN/2048.
Unipolar (0 V to +5 V) Configuration
The 0 V to +5 V output voltage range is achieved by tying ROFSA
or ROFSB to VOUTA or VOUTB. Once again, the AD7237A/
AD7247A can be operated single supply or from dual supplies.
The table for output voltage versus digital code is as in Table
III, with 2 REF IN replaced by REF IN. Note, for this range,
1 LSB = REF IN (2
–12) = (REF IN/4096).
Bipolar Configuration
The bipolar configuration for the AD7237A/AD7247A, which
gives an output range of –5 V to +5 V, is achieved by connect-
ing ROFSA, or ROFSB, to REF IN. The AD7237A/AD7247A must
be operated from dual supplies to achieve this output voltage
range. Figure 9 shows the connection diagram for bipolar opera-
tion for DAC A of the AD7247A. An AD586 provides the refer-
ence voltage for the DAC but this could be provided by the
on-chip reference by connecting REF OUT to REF IN. The
code table for bipolar operation is shown in Table IV. Similar
connections apply for the AD7237A.
Figure 9. Bipolar Configuration
Table IV. Bipolar Code Table
DAC Latch Contents
MSB
LSB
Analog Output, VOUT
1111 1111 1111
+REF IN (2047/2048)
1000 0000 0001
+REF IN (1/2048)
1000 0000 0000
0 V
0111 1111 1111
–REF IN (1/2048)
0000 0000 0001
–REF IN (2047/2048)
0000 0000 0000
–REF IN (2048/2048) = –REF IN
Note: 1 LSB = REF IN/2048.
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