参数资料
| 型号： | AD7847BRZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 11/12页 |
| 文件大小： | 0K |
| 描述： | IC DAC 12BIT DUAL MULT 24-SOIC |
| 产品培训模块： | Data Converter Fundamentals DAC Architectures |
| 标准包装： | 1 |
| 设置时间： | 4µs |
| 位数： | 12 |
| 数据接口： | 并联 |
| 转换器数目： | 2 |
| 电压电源： | 双 ± |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 24-SOIC（0.295"，7.50mm 宽） |
| 供应商设备封装： | 24-SOIC W |
| 包装： | 管件 |
| 输出数目和类型： | 2 电压，单极；2 电压，双极 |
| 采样率（每秒）： | 250k |
AD7837/AD7847
REV. C
–8–
VALID
DATA
t6
t3
t8
WR
DATA
ADDRESS DATA
t7
t1
t2
t5
t4
CS
A0/A1
LDAC
Figure 14. AD7837 Write Cycle Timing Diagram
CS, WR, A0 and A1 control the loading of data to the input
latches. The eight data inputs accept right-justified data. Data
can be loaded to the input latches in any sequence. Provided that
LDAC is held high, there is no analog output change as a result
of loading data to the input latches. Address lines A0 and A1
determine which latch data is loaded to when
CS and WR are low.
The control logic truth table for the part is shown in Table II.
Table II. AD7837 Truth Table
CS WR A1 A0 LDAC Function
1
X
1
No Data Transfer
X
1
X
1
No Data Transfer
0
1
DAC A LS Input Latch Transparent
0
1
DAC A MS Input Latch Transparent
0
1
0
1
DAC B LS Input Latch Transparent
0
1
DAC B MS Input Latch Transparent
1
X
0
DAC A and DAC B DAC Latches
Updated Simultaneously from the
Respective Input Latches
X = Don’t Care.
The
LDAC input controls the transfer of 12-bit data from the
input latches to the DAC latches. When
LDAC is taken low, both
DAC latches, and hence both analog outputs, are updated at
the same time. The data in the DAC latches is held on the rising
edge of
LDAC. The LDAC input is asynchronous and indepen-
dent of
WR. This is useful in many applications especially in the
simultaneous updating of multiple AD7837s. However, care must
be taken while exercising
LDAC during a write cycle. If an LDAC
operation overlaps a
CS and WR operation, there is a possibility
of invalid data being latched to the output. To avoid this,
LDAC
must remain low after
CS or WR return high for a period equal
to or greater than t8, the minimum LDAC pulsewidth.
UNIPOLAR BINARY OPERATION
Figure 15 shows DAC A on the AD7837/AD7847 connected
for unipolar binary operation. Similar connections apply for
DAC B. When VIN is an ac signal, the circuit performs 2-quad-
rant multiplication. The code table for this circuit is shown in
Table III. Note that on the AD7847 the feedback resistor RFB is
internally connected to VOUT.
DAC A
AGNDA
VOUTA
VREFA
VIN
DGND
VSS
RFBA
*
VSS
VDD
AD7837
AD7847
VOUT
*INTERNALLY
CONNECTED
ON AD7847
Figure 15. Unipolar Binary Operation
Table III. Unipolar Code Table
DAC Latch Contents
MSB
LSB
Analog Output, VOUT
1111 1111 1111
–VIN
×
4095
4096
1000 0000 0000
–VIN
×
2048
4096
= –1/ 2 V
IN
0000 0000 0001
–VIN
×
1
4096
0000 0000 0000
0 V
Note 1 LSB =
V
IN
4096
.
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相关代理商/技术参数 |
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|---|---|
| AD7847BRZ | 制造商:Analog Devices 功能描述:IC 12-BIT DAC |
| AD7847BRZ-REEL | 功能描述:IC DAC 12BIT DUAL MULT 24-SOIC RoHS:是 类别:集成电路 (IC) >> 数据采集 - 数模转换器 系列:- 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 |
| AD7847SQ | 制造商:Rochester Electronics LLC 功能描述:LC2MOS COMPLETE, DUAL 12-BIT MDAC, PARALLEL LOADING STRUCTUR - Bulk 制造商:Analog Devices 功能描述: |
| AD7847SQ/883B | 制造商:AD 制造商全称:Analog Devices 功能描述:LC2MOS Complete, Dual 12-Bit MDACs |
| AD7847SQ883B | 制造商:AD 制造商全称:Analog Devices 功能描述:LC2MOS Complete, Dual 12-Bit MDACs |
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