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参数资料
| 型号： | AD7247A |
| 厂商： | Analog Devices, Inc. |
| 英文描述： | LC2MOS Dual 12-Bit DACPORTs |
| 中文描述： | LC2MOS双12位DACPORTs |
| 文件页数： | 10/12页 |
| 文件大小： | 392K |
| 代理商： | AD7247A |
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 R
OFS
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, R
OFSA
, or R
OFSB
, 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, V
OUT
1111 1111 1111
1000 0000 0001
1000 0000 0000
0111 1111 1111
0000 0000 0001
0000 0000 0000
+2
REF IN (4095/4096)
+2 REF IN (2049/4096)
+2 REF IN (2048/4096) = +REF IN
+2 REF IN (2047/4096)
+2 REF IN (1/4096)
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 R
OFSA
or R
OFSB
to V
OUTA
or V
OUTB
. 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 R
OFSA
, or R
OFSB
, 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, V
OUT
1111 1111 1111
1000 0000 0001
1000 0000 0000
0111 1111 1111
0000 0000 0001
0000 0000 0000
+REF IN (2047/2048)
+REF IN (1/2048)
0 V
–REF IN (1/2048)
–REF IN (2047/2048)
–REF IN (2048/2048) = –REF IN
Note: 1 LSB = REF IN/2048.
相关PDF资料 |
PDF描述 |
|---|---|
| AD7237A | LC2MOS Dual 12-Bit DACPORTs |
| AD7237AAN | CAPACITOR, 10UF, 50V ELECTROLYTIC, RADIAL |
| AD7237AAR | LC2MOS Dual 12-Bit DACPORTs |
| AD7237ABN | 10K 10-TURN WW 1/4 DIA SHAFT |
| AD7237ABR | LC2MOS Dual 12-Bit DACPORTs |
相关代理商/技术参数 |
参数描述 |
|---|---|
| AD7247AAN | 功能描述:IC DAC 12BIT W/AMP W/BUFF 24-DIP RoHS:否 类别:集成电路 (IC) >> 数据采集 - 数模转换器 系列:DACPORT® 产品培训模块:Data Converter Fundamentals DAC Architectures 标准包装:750 系列:- 设置时间:7µs 位数:16 数据接口:并联 转换器数目:1 电压电源:双 ± 功率耗散（最大）:100mW 工作温度:0°C ~ 70°C 安装类型:表面贴装 封装/外壳:28-LCC（J 形引线） 供应商设备封装:28-PLCC（11.51x11.51） 包装:带卷 (TR) 输出数目和类型:1 电压，单极；1 电压，双极 采样率（每秒）:143k |
| AD7247AANZ | 功能描述:IC DAC 12BIT W/AMP W/BUFF 24-DIP RoHS:是 类别:集成电路 (IC) >> 数据采集 - 数模转换器 系列:DACPORT® 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:50 系列:- 设置时间:4µs 位数:12 数据接口:串行 转换器数目:2 电压电源:单电源 功率耗散（最大）:- 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:8-TSSOP，8-MSOP（0.118"，3.00mm 宽） 供应商设备封装:8-uMAX 包装:管件 输出数目和类型:2 电压，单极 采样率（每秒）:* 产品目录页面:1398 (CN2011-ZH PDF) |
| AD7247AAR | 功能描述:IC DAC 12BIT W/AMP W/BUFF 24SOIC RoHS:否 类别:集成电路 (IC) >> 数据采集 - 数模转换器 系列:DACPORT® 产品培训模块:Data Converter Fundamentals DAC Architectures 标准包装:750 系列:- 设置时间:7µs 位数:16 数据接口:并联 转换器数目:1 电压电源:双 ± 功率耗散（最大）:100mW 工作温度:0°C ~ 70°C 安装类型:表面贴装 封装/外壳:28-LCC（J 形引线） 供应商设备封装:28-PLCC（11.51x11.51） 包装:带卷 (TR) 输出数目和类型:1 电压，单极；1 电压，双极 采样率（每秒）:143k |
| AD7247AAR-REEL | 制造商:Analog Devices 功能描述:DAC 2-CH R-2R 12-bit 24-Pin SOIC W T/R 制造商:Analog Devices 功能描述:DAC 2CH R-2R 12-BIT 24SOIC W - Tape and Reel |
| AD7247AAR-REEL7 | 功能描述:IC DAC 12BIT W/AMP W/BUFF 24SOIC RoHS:否 类别:集成电路 (IC) >> 数据采集 - 数模转换器 系列:DACPORT® 产品培训模块:Data Converter Fundamentals DAC Architectures 标准包装:750 系列:- 设置时间:7µs 位数:16 数据接口:并联 转换器数目:1 电压电源:双 ± 功率耗散（最大）:100mW 工作温度:0°C ~ 70°C 安装类型:表面贴装 封装/外壳:28-LCC（J 形引线） 供应商设备封装:28-PLCC（11.51x11.51） 包装:带卷 (TR) 输出数目和类型:1 电压，单极；1 电压，双极 采样率（每秒）:143k |
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