参数资料
| 型号： | AD7840KPZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 12/16页 |
| 文件大小： | 0K |
| 描述： | IC DAC 14BIT LOW PWR 5V 28-PLCC |
| 产品培训模块： | Data Converter Fundamentals DAC Architectures |
| 标准包装： | 1 |
| 设置时间： | 2.5µs |
| 位数： | 14 |
| 数据接口： | 串行，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： | 管件 |
| 输出数目和类型： | 1 电压，双极 |
| 采样率（每秒）： | 400k |
AD7840
REV. B
–5–
PIN CONFIGURATIONS
DIP/SSOP
PLCC
for external use, it should he decoupled to AGND with a 200
resistor in series with a parallel combination of a 10
F tantalum
capacitor and a 0.1
F ceramic capacitor.
Figure 2. Internal Reference
EXTERNAL REFERENCE
In some applications, the user may require a system reference or
some other external reference to drive the AD7840 reference in-
put. Figure 3 shows how the AD586 5 V reference can be con-
ditioned to provide the 3 V reference required by the AD7840
REF IN. An alternate source of reference voltage for the
AD7840 in systems which use both a DAC and an ADC is to
use the REF OUT voltage of ADCs such as the AD7870 and
AD7871. A circuit showing this arrangement is shown in
Figure 20.
Figure 3. AD586 Driving AD7840 REF IN
D/A SECTION
The AD7840 contains a 14-bit voltage mode D/A converter
consisting of highly stable thin film resistors and high speed
NMOS single-pole, double-throw switches. The simplified cir-
cuit diagram for the DAC section is shown in Figure 1. The
three MSBs of the data word are decoded to drive the seven
switches A–G. The 11 LSBs switch an 11-bit R-2R ladder struc-
ture. The output voltage from this converter has the same polar-
ity as the reference voltage, REF IN.
The REF IN voltage is internally buffered by a unity gain ampli-
fier before being applied to the D/A converter and the bipolar
bias circuitry. The D/A converter is configured and sealed for a
3 V reference and the device is tested with 3 V applied to REF
IN. Operating the AD7840 at reference voltages outside the
±5% tolerance range may result in degraded performance from
the part.
Figure 1. DAC Ladder Structure
INTERNAL REFERENCE
The AD7840 has an on-chip temperature compensated buried
Zener reference (see Figure 2) which is factory trimmed to 3 V
±10 mV. The reference voltage is provided at the REF OUT
pin. This reference can be used to provide both the reference
voltage for the D/A converter and the bipolar bias circuitry. This
is achieved by connecting the REF OUT pin to the REF IN pin
of the device.
The reference voltage can also be used as a reference for other
components and is capable of providing up to 500
A to an ex-
ternal load. The maximum recommended capacitance on REF
OUT for normal operation is 50 pF. If the reference is required
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相关代理商/技术参数 |
参数描述 |
|---|---|
| AD7840KPZ-RL | 功能描述:14 Bit Digital to Analog Converter 1 28-PLCC (11.51x11.51) 制造商:analog devices inc. 系列:- 包装:带卷（TR） 零件状态:在售 位数:14 数模转换器数:1 建立时间:4μs 输出类型:Voltage - Buffered 差分输出:无 数据接口:并联，串行 参考类型:外部， 内部 电压 - 电源，模拟:±5V 电压 - 电源，数字:- INL/DNL（LSB）:±1（最大），±0.9（最大） 架构:R-2R 工作温度:0°C ~ 70°C 封装/外壳:28-LCC（J 形引线） 供应商器件封装:28-PLCC（11.51x11.51） 标准包装:1 |
| AD7840LN | 制造商:未知厂家 制造商全称:未知厂家 功能描述:14-Bit Digital-to-Analog Converter |
| AD7840LP | 制造商:未知厂家 制造商全称:未知厂家 功能描述:14-Bit Digital-to-Analog Converter |
| AD7840SE/883B | 制造商:未知厂家 制造商全称:未知厂家 功能描述:14-Bit Digital-to-Analog Converter |
| AD7840SQ | 制造商:AD 制造商全称:Analog Devices 功能描述:LC2MOS Complete 14-Bit DAC |
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