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参数资料
| 型号： | AD7249ANZ |
| 厂商： | ANALOG DEVICES INC |
| 元件分类： | DAC |
| 英文描述： | LC2MOS Dual 12-Bit Serial DACPORT |
| 中文描述： | DUAL, SERIAL INPUT LOADING, 5 us SETTLING TIME, 12-BIT DAC, PDIP16 |
| 封装： | PLASTIC, DIP-16 |
| 文件页数： | 11/12页 |
| 文件大小： | 149K |
| 代理商： | AD7249ANZ |
REV. C
–8–
AD7249
t2
t5
t4
t3
t10
t6
t7
t8
t9
DB15
DB14
DB13
DB12
DB11
DB0
DB15
DB14
DB13
DB12
DB10
DB0
DON'T
CARE
DON'T
CARE
DON'T
CARE
DAC
SELECT
=0
MSB
DON'T
CARE
DON'T
CARE
DON'T
CARE
DAC
SELECT
=1
MSB
LSB
DAC A
DAC B
t1
SCLK
SYNC
SDIN
LDAC
CLR
Figure 8. Timing Diagram
TRANSFER FUNCTION
The internal scaling resistors provided on the AD7249 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 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
offset resistor ROFSA, ROFSB (Pin 3, 16) to AGND. Natural Bi-
nary data format is selected by connecting
BIN/COMP (Pin 7)
to DGND. In this configuration, the AD7249 can be operated
using either single or dual supplies. Note that the VDD supply is
AD7249*
VDD
2R
A1
A2
12-BIT
DAC A
12-BIT
DAC B
REFOUT
REFIN
ROFSA
VOUTA
0V TO 10V
ROFSB
VOUTB
0V TO 10V
BIN/COMP
DGND
AGND
0V OR VSS
VSS
*ADDITIONAL PINS OMITTED FOR CLARITY.
Figure 9. Unipolar (0 V to +10 V) Configuration
restricted to +15 V
± 10% for this range in order to maintain
sufficient amplifier headroom. Dual supplies may be used to
improve settling time and give increased current sink capability
for the amplifier. Figure 9 shows the connection diagram for
unipolar operation of the AD7249. Table I shows the digital
code vs. analog output for this configuration.
Unipolar (0 V to +5 V) Configuration
The 0 V to +5 V output voltage range is achieved by tying
ROFSA to VOUTA or ROFSB to VOUTB. Once again, the AD7249
can be operated using either single or dual supplies. The table
for output voltage versus digital code is as in Table I, with
2REFIN replaced by REFIN. Note, for this range, 1 LSB =
REFIN
× (2–12) = (REFIN/4096).
Table I. Unipolar Code Table (0 V to +10 V Range)
Input Data Word
MSB
LSB
Analog Output, VOUT
XXXY 1111 1111 1111
+2REFIN
× (4095/4096)
XXXY 1000 0000 0001
+2REFIN
× (2049/4096)
XXXY 1000 0000 0000
+2REFIN
× (2048/4096) = +REFIN
XXXY 0111 1111 1111
+2REFIN
× (2047/4096)
XXXY 0000 0000 0001
+2REFIN
× (1/4096)
XXXY 0000 0000 0000
0 V
X = Don’t Care.
Y = DAC Select Bit, 0 = DAC A, 1= DAC B.
Note: 1 LSB = 2REFIN/4096.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| AD7249ANZ | 制造商:Analog Devices 功能描述:IC 12-BIT DAC |
| AD7249AR | 功能描述:IC DAC 12BIT SRL W/REF 16-SOIC 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 |
| AD7249AR-REEL | 功能描述:数模转换器- DAC LC2MOS DUAL 12-BIT SERIAL IC RoHS:否 制造商:Analog Devices 转换器数量:4 DAC 输出端数量:4 转换速率: 分辨率:12 bit 接口类型:Serial (I2C) 稳定时间: 最大工作温度:+ 105 C 安装风格: 封装 / 箱体:TSSOP 封装:Reel |
| AD7249ARZ | 功能描述:IC DAC 12BIT SRL W/REF 16-SOIC 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) |
| AD7249ARZ | 制造商:Analog Devices 功能描述:IC 12-BIT DAC |
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