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参数资料
| 型号： | DAC8562FSZ-REEL |
| 厂商： | Analog Devices Inc |
| 文件页数： | 4/16页 |
| 文件大小： | 0K |
| 描述： | IC DAC 12BIT PARALLEL 5V 20-SOIC |
| 产品培训模块： | Data Converter Fundamentals DAC Architectures |
| 标准包装： | 1,000 |
| 设置时间： | 16µs |
| 位数： | 12 |
| 数据接口： | 并联 |
| 转换器数目： | 1 |
| 电压电源： | 单电源 |
| 功率耗散（最大）： | 30mW |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 20-SOIC（0.295"，7.50mm 宽） |
| 供应商设备封装： | 20-SOIC W |
| 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）： | 62.5k |
DAC8562
REV. A
–12–
Alternatively, the output voltage can be coded in complementary
offset binary using the circuit in Figure 35. This configuration
eliminates the need for a pull-down resistor or an op amp for
REFOUT The transfer equation of the circuit is given by:
V
O = –1 mV × Digital Code ×
R2
R1
+ REFOUT
×
R4
R3
+ R4
× 1+
R2
R1
and, for the values shown, becomes:
V
O =2. 44 mV × Digital Code + 5 V
DAC-8562
REFOUT
VOUT
R1
R4
R3
R2
VO
RANGE
±5V
R2
23.7k + 715
R4
13.7k + 169
R1 = R3 = 10k
Figure 35 Bipolar Output Operation Without
Trim Version 2
Generating a Negative Supply Voltage
Some applications may require bipolar output configuration, but
only have a single power supply rail available. This is very com-
mon in data acquisition systems using microprocessor-based sys-
tems. In these systems, only +12 V, +15 V, and/or +5 V are
available. Shown in Figure 36 is a method of generating a nega-
tive supply voltage using one CD4049, a CMOS hex inverter,
operating on +12 V or +15 V. The circuit is essentially a charge
pump where two of the six are used as an oscillator. For the val-
ues shown, the frequency of oscillation is approximately 3.5 kHz
and is fairly insensitive to supply voltage because R1 > 2
R2.
The remaining four inverters are wired in parallel for higher out-
put current. The square-wave output is level translated by C2 to
a negative-going signal, rectified using a pair of 1N4001s, and
then filtered by C3. With the values shown, the charge pump
will provide an output voltage of –5 V for current loading in the
range 0.5 mA
≤ I
OUT
≤ 10 mA with a +15 V supply and
0.5 mA
≤ I
OUT
≤ 7 mA with a +12 V supply.
910
6
11
12
14
15
7
32
5
4
R2
5.1k
R1
510k
C1
0.02F
C2
47F
D1
1N4001
C3
47F
1N5231
5.1V
ZENER
D2
1N4001
R3
470
–5V
INVERTERS = CD4049
Figure 36. Generating a –5 V Supply When
Only +12 V or +15 V Are Available
Audio Volume Control
The DAC8562 is well suited to control digitally the gain or
attenuation of a voltage controlled amplifiers. In professional
audio mixing consoles, music synthesizers, and other audio proces-
sors, VCAs, such as the SSM2018, adjust audio channel gain and
attenuation from front panel potentiometers. The VCA provides a
clean gain transition control of the audio level when the slew rate of
the analog input control voltage, VC, is properly chosen. The cir-
cuit in Figure 37 illustrates a volume control application using the
DAC8562 to control the attenuation of the SSM2018.
15
16
DGND
AGND
DATA
DAC-8562
13
+15V
10
CE
CLR
20
12
0.1F
4
REF-02
6
2
0.1F
18k
10pF
470k
P1
100k
10M
OFFSET
TRIM
47pF
SYMMETRY
TRIM
P2
500k
VOUT
+15V
–15V
30k
+15V
–15V
0.1F
+15V
18k
VIN
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
SSM-2018
+5V
CCON
1F
R6
825
R7
1k
*
0V
≤ V
C ≤ +2.24V
* – PRECISION RESISTOR PT146
1k
COMPENSATOR
Figure 37. Audio Volume Control
Since the supply voltage available in these systems is typically
±15 V or ±18 V, a REF02 is used to supply the +5 V required
to power the DAC. No trimming of the reference is required be-
cause of the reference’s tight initial tolerance and low supply
current consumption of the DAC8562. The SSM2018 is config-
ured as a unity-gain buffer when its control voltage equals
0 volt. This corresponds to a 000H code from the DAC8562.
Since the SSM2018 exhibits a gain constant of –28 mV/dB
(typical), the DAC’s full-scale output voltage has to be scaled
down by R6 and R7 to provide 80 dB of attenuation when the
digital code equals FFFH. Therefore, every DAC LSB corre-
sponds to 0.02 dB of attenuation. Table V illustrates the attenu-
ation versus digital code of the volume control circuit.
Table V. SSM2018 VCA Attenuation vs.
DAC8562 Input Code
Hexadecimal Number
Control Voltage
VCA Attenuation
in DAC Register
(V)
(dB)
000
0
400
+0.56
20
800
+1.12
40
C00
+1.68
60
FFF
+2.24
80
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| DAC8562GBC | 制造商:AD 制造商全称:Analog Devices 功能描述:+5 Volt, Parallel Input Complete 12-Bit DAC |
| DAC8562SDGSR | 功能描述:数模转换器- DAC 16B,Dual,Lo Pwr Ultra-Lo Glitch DAC RoHS:否 制造商:Texas Instruments 转换器数量:1 DAC 输出端数量:1 转换速率:2 MSPs 分辨率:16 bit 接口类型:QSPI, SPI, Serial (3-Wire, Microwire) 稳定时间:1 us 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-14 封装:Tube |
| DAC8562SDGST | 功能描述:数模转换器- DAC 16B,Dual,Lo Pwr Ultra-Lo Glitch DAC RoHS:否 制造商:Texas Instruments 转换器数量:1 DAC 输出端数量:1 转换速率:2 MSPs 分辨率:16 bit 接口类型:QSPI, SPI, Serial (3-Wire, Microwire) 稳定时间:1 us 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-14 封装:Tube |
| DAC8562SDSCR | 功能描述:数模转换器- DAC 16B,Dual,Lo Pwr Ultra-Lo Glitch DAC RoHS:否 制造商:Texas Instruments 转换器数量:1 DAC 输出端数量:1 转换速率:2 MSPs 分辨率:16 bit 接口类型:QSPI, SPI, Serial (3-Wire, Microwire) 稳定时间:1 us 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-14 封装:Tube |
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