参数资料
| 型号： | AD667KP |
| 厂商： | Analog Devices Inc |
| 文件页数： | 5/8页 |
| 文件大小： | 0K |
| 描述： | IC DAC 12BIT W/BUFF LATCH 28PLCC |
| 产品培训模块： | Data Converter Fundamentals DAC Architectures |
| 标准包装： | 1 |
| 设置时间： | 3µs |
| 位数： | 12 |
| 转换器数目： | 1 |
| 电压电源： | 双 ± |
| 功率耗散（最大）： | 1W |
| 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，单极；1 电压，双极 |
| 采样率（每秒）： | 500k |
AD667
REV. A
–5–
ANALOG CIRCUIT CONNECTIONS
Internal scaling resistors provided in the AD667 may be connected
to produce bipolar output voltage ranges of
±10, ±5 or ±2.5 V or
unipolar output voltage ranges of 0 V to +5 V or 0 V to +10 V.
Gain and offset drift are minimized in the AD667 because of the
thermal tracking of the scaling resistors with other device com-
ponents. Connections for various output voltage ranges are
shown in Table I.
Figure 1. Output Amplifier Voltage Range Scaling Circuit
UNIPOLAR CONFIGURATION (Figure 2)
This configuration will provide a unipolar 0 volt to +10 volt out-
put range. In this mode, the bipolar offset terminal, Pin 4, should
be grounded if not used for trimming.
Figure 2. 0 V to +10 V Unipolar Voltage Output
STEP I . . . ZERO ADJUST
Turn all bits OFF and adjust zero trimmer R1, until the output
reads 0.000 volts (1 LSB = 2.44 mV). In most cases this trim is
not needed, and Pin 4 should be connected to Pin 5.
STEP II . . . GAIN ADJUST
Turn all bits ON and adjust 100
gain trimmer R2, until the
output is 9.9976 volts. (Full scale is adjusted to 1 LSB less than
nominal full scale of 10.000 volts.)
BIPOLAR CONFIGURATION (Figure 3)
This configuration will provide a bipolar output voltage from
–5.000 to +4.9976 volts, with positive full scale occurring with
all bits ON (all 1s).
STEP I . . . OFFSET ADJUST
Turn OFF all bits. Adjust 100
trimmer R1 to give –5.000
volts output.
STEP II . . . GAIN ADJUST
Turn ON all bits. Adjust 100
gain trimmer R2 to give a read-
ing of +4.9976 volts.
Figure 3.
±5 V Bipolar Voltage Output
INTERNAL/EXTERNAL REFERENCE USE
The AD667 has an internal low noise buried Zener diode refer-
ence which is trimmed for absolute accuracy and temperature
coefficient. This reference is buffered and optimized for use in a
high speed DAC and will give long-term stability equal or superior
to the best discrete Zener reference diodes. The performance of
the AD667 is specified with the internal reference driving the
DAC since all trimming and testing (especially for full-scale
error and bipolar offset) is done in this configuration.
The internal reference has sufficient buffering to drive external
circuitry in addition to the reference currents required for the
DAC (typically 0. 5 mA to Ref In and 1.0 mA to Bipolar Off-
set). A minimum of 0.1 mA is available for driving external
loads. The AD667 reference output should be buffered with an
external op amp if it is required to supply more than 0.1 mA
output current. The reference is typically trimmed to
±0.2%,
then tested and guaranteed to
±1.0% max error. The tempera-
ture coefficient is comparable to that of the full-scale TC for a
particular grade.
If an external reference is used (10.000 V, for example), addi-
tional trim range must be provided, since the internal reference
has a tolerance of
±1%, and the AD667 full-scale and bipolar
offset are both trimmed with the internal reference. The gain
and offset trim resistors give about
±0.25% adjustment range,
which is sufficient for the AD667 when used with the internal
reference.
It is also possible to use external references other than 10 volts.
The recommended range of reference voltage is from +8 to
+11 volts, which allows both 8.192 V and 10.24 V ranges to be
used. The AD667 is optimized for fixed-reference applications.
If the reference voltage is expected to vary over a wide range in a
particular application, a CMOS multiplying DAC is a better
choice.
Reduced values of reference voltage will also permit the
±12
volt
± 5% power supply requirement to be relaxed to ±12 volts
± 10%.
It is not recommended that the AD667 be used with external
feedback resistors to modify the scale factor. The internal resis-
tors are trimmed to ratio-match and temperature-track the other
resistors on the chip, even though their absolute tolerances are
±20%, and absolute temperature coefficients are approximately
–50 ppm/
°C. If external resistors are used, a wide trim range
(
±20%) will be needed and temperature drift will be increased
to reflect the mismatch between the temperature coefficients of
the internal and external resistors.
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相关代理商/技术参数 |
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| AD667KP-REEL | 制造商:Rochester Electronics LLC 功能描述:- Tape and Reel |
| AD667KPZ | 功能描述:IC DAC 12BIT W/BUFF LATCH 28PLCC RoHS:是 类别:集成电路 (IC) >> 数据采集 - 数模转换器 系列:- 标准包装:1 系列:- 设置时间:4.5µs 位数:12 数据接口:串行，SPI? 转换器数目:1 电压电源:单电源 功率耗散（最大）:- 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:8-SOIC（0.154"，3.90mm 宽） 供应商设备封装:8-SOICN 包装:剪切带 (CT) 输出数目和类型:1 电压，单极；1 电压，双极 采样率（每秒）:* 其它名称:MCP4921T-E/SNCTMCP4921T-E/SNRCTMCP4921T-E/SNRCT-ND |
| AD667KPZ-REEL | 功能描述:IC DAC 12BIT W/BUFF LATCH 28PLCC 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 |
| AD667SD | 功能描述:数模转换器- DAC IC - 12-BIT D/A CONVERTER 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 |
| AD667SD/883B | 功能描述:数模转换器- DAC IC - 12-BIT D/A CONVERTER 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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