参数资料
| 型号： | AD7537LPZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 7/10页 |
| 文件大小： | 0K |
| 描述： | IC DAC 12BIT DUAL MULT 28PLCC |
| 产品培训模块： | Data Converter Fundamentals DAC Architectures |
| 标准包装： | 1 |
| 设置时间： | 250µs |
| 位数： | 12 |
| 数据接口： | 并联 |
| 转换器数目： | 2 |
| 电压电源： | 单电源 |
| 功率耗散（最大）： | 24mW |
| 工作温度： | -40°C ~ 85°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： | 管件 |
| 输出数目和类型： | 2 电流，单极；2 电流，双极 |
| 采样率（每秒）： | 667k |
AD7537
REV.
–6–
SEPARATE AGND PINS
The DACs in the AD7537 have separate AGND lines taken to
pins AGNDA and AGNDB on the package. This increases the
applications versatility of the part. Figure 6 is an example of
this. DAC A is connected in standard fashion as a program-
mable attenuator. AGNDA is at ground potential. DAC B is op-
erating with AGND B biased to +5 V by the AD584. This gives
an output range of +5 V to +10 V.
Figure 6. AD7537 DACs Used in Different Modes
PROGRAMMABLE OSCILLATOR
Figure 7 shows a conventional state variable oscillator in which
the AD7537 controls the programmable integrators. The fre-
quency of oscillation is given by:
f
=
1
2
π
R
6
R
5
×
1
C
1
×C2× REQ1× REQ2
where REQ1 and REQ2 are the equivalent resistances of the
DACs. The same digital code is loaded into both DACs.
If C1 = C2 and R5 = R6, the expression reduces to
f
=
1
2
π
×
1
C
1
REQ1 × REQ2
Since R
EQ
=
2n
× R
LAD
N
, (RLAD = DAC ladder resistance).
f
=
1
2
π
×
1
C
(N /2n )2
RLAD1 × RLAD2
=
1
2
π
×
D
C
1
RLAD1 × RLAD2
D
=
N
2n
=
1
2
π
×
D
C
× R
LAD m
where m is the DAC ladder resistance mismatch ratio, typically
1.005.
With the values shown in Figure 7, the output frequency varies
from 0 Hz to 1.38 kHz. The amplitude of the output signal at
the A3 output is 10 V peak-to-peak and is constant over the
entire frequency span.
Figure 7. Programmable State Variable Oscillator
A
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相关代理商/技术参数 |
参数描述 |
|---|---|
| AD7537LPZ-REEL | 制造商:AD 制造商全称:Analog Devices 功能描述:LC2MOS 84) Loading Dual 12-Bit DAC |
| AD7537SE | 制造商:AD 制造商全称:Analog Devices 功能描述:LC2MOS (8+4) Loading Dual 12-Bit DAC |
| AD7537SE/883B | 制造商:未知厂家 制造商全称:未知厂家 功能描述:12-Bit Digital-to-Analog Converter |
| AD7537SQ | 制造商:Analog Devices 功能描述: |
| AD7537SQ/883B | 制造商:Analog Devices 功能描述: |
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