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参数资料
| 型号： | DAC8562FSZ-REEL |
| 厂商： | Analog Devices Inc |
| 文件页数： | 12/16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
–5–
OPERATION
The DAC8562 is a complete ready to use 12-bit digital-to-
analog converter. Only one +5 V power supply is necessary for
operation. It contains a voltage-switched, 12-bit, laser-trimmed
digital-to-analog converter, a curvature-corrected bandgap refer-
ence, a rail-to-rail output op amp, and a DAC register. The par-
allel data interface consists of 12 data bits, DB0–DB11, and a
active low CE strobe. In addition, an asynchronous CLR pin
will set all DAC register bits to zero causing the VOUT to be-
come zero volts. This function is useful for power on reset or
system failure recovery to a known state.
D/A CONVERTER SECTION
The internal DAC is a 12-bit voltage-mode device with an out-
put that swings from AGND potential to the 2.5 volt internal
bandgap voltage. It uses a laser trimmed R-2R ladder which is
switched by N channel MOSFETs. The output voltage of the
DAC has a constant resistance independent of digital input
code. The DAC output (not available to the user) is internally
connected to the rail-to-rail output op amp.
AMPLIFIER SECTION
The internal DAC’s output is buffered by a low power con-
sumption precision amplifier. This low power amplifier contains
a differential PNP pair input stage which provides low offset
voltage and low noise, as well as the ability to amplify the zero-
scale DAC output voltages. The rail-to-rail amplifier is config-
ured in a gain of 1.6384 (= 4.095 V/2.5 V) in order to set the
4.095 volt full-scale output (1 mV/LSB). See Figure 3 for an
equivalent circuit schematic of the analog section.
R1
R2
VOUT
RAIL-TO-RAIL
OUTPUT
AMPLIFIER
R
BANDGAP
REFERENCE
REFOUT
2.5V
2R
R
2R
SPDT
N ch FET
SWITCHES
2R
AV = 4.096/2.5
= 1.636V/V
VOLTAGE SWITCHED 12-BIT
R-2R D/A CONVERTER
BUFFER
Figure 3. Equivalent DAC8562 Schematic of
Analog Portion
The op amp has a 16
s typical settling time to 0.01%. There
are slight differences in settling time for negative slewing signals
versus positive. See the oscilloscope photos in the Typical Per-
formances section of this data sheet.
OUTPUT SECTION
The rail-to-rail output stage of this amplifier has been designed
to provide precision performance while operating near either
power supply. Figure 4 shows an equivalent output schematic of
the rail-to-rail amplifier with its N channel pull down FETs that
will pull an output load directly to GND. The output sourcing
current is provided by a P channel pull-up device that can sup-
ply GND terminated loads, especially important at the –5%
supply tolerance value of 4.75 volts.
VDD
VOUT
AGND
N-CH
P-CH
Figure 4. Equivalent Analog Output Circuit
Figures 5 and 6 in the typical performance characteristics sec-
tion provide information on output swing performance near
ground and full scale as a function of load. In addition to resis-
tive load driving capability, the amplifier has also been carefully
designed and characterized for up to 500 pF capacitive load
driving capability.
REFERENCE SECTION
The internal 2.5 V curvature-corrected bandgap voltage refer-
ence is laser trimmed for both initial accuracy and low tempera-
ture coefficient. The voltage generated by the reference is
available at the REFOUT pin. Since REFOUT is not intended
to drive external loads, it must be buffered–refer to the applica-
tions section for more information. The equivalent emitter fol-
lower output circuit of the REFOUT pin is shown in Figure 3.
Bypassing the REFOUT pin is not required for proper opera-
tion. Figure 7 shows broadband noise performance.
POWER SUPPLY
The very low power consumption of the DAC8562 is a direct
result of a circuit design optimizing use of the CBCMOS pro-
cess. By using the low power characteristics of the CMOS for
the logic, and the low noise, tight matching of the complemen-
tary bipolar transistors, good analog accuracy is achieved.
For power-consumption sensitive applications it is important to
note that the internal power consumption of the DAC8562 is
strongly dependent on the actual logic-input voltage-levels
present on the DB0–DB11, CE and CLR pins. Since these in-
puts are standard CMOS logic structures, they contribute static
power dissipation dependent on the actual driving logic VOH and
VOL voltage levels. The graph in Figure 9 shows the effect on to-
tal DAC8562 supply current as a function of the actual value of
input logic voltage. Consequently for optimum dissipation use
of CMOS logic versus TTL provides minimal dissipation in the
static state. A VINL = 0 V on the DB0–DB11 pins provides the
lowest standby dissipation of 600
A with a +5 V power supply.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| 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 |
| DAC8562SDSCT | 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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