参数资料
| 型号： | AD7244JR |
| 厂商： | Analog Devices Inc |
| 文件页数： | 10/12页 |
| 文件大小： | 0K |
| 描述： | IC DAC 14BIT LC2MOS DUAL 28SOIC |
| 产品培训模块： | Data Converter Fundamentals DAC Architectures |
| 标准包装： | 1 |
| 设置时间： | 4µs |
| 位数： | 14 |
| 数据接口： | 串行 |
| 转换器数目： | 2 |
| 电压电源： | 双 ± |
| 功率耗散（最大）： | 195mW |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 28-SOIC（0.295"，7.50mm 宽） |
| 供应商设备封装： | 28-SOIC W |
| 包装： | 管件 |
| 输出数目和类型： | 2 电压，双极 |
| 采样率（每秒）： | 250k |
AD7242/AD7244
REV. A
–7–
Output Amplifier
The outputs from each of the voltage-mode DACs are buffered
by a noninverting amplifier. The buffer amplifier is capable of
developing
±3 V across a 2 k and 100 pF load to ground, and
can produce 6 V peak-to-peak sine wave signals to a frequency
of 20 kHz. The output is updated on the falling edge of the
respective LDAC input. The output voltage settling time, to
within 1/2 LSB of its final value, is typically less than 2
s for
the AD7242 and 2.5
s for the AD7244.
The small signal (200 mV p-p) bandwidth of the output buffer
amplifier is typically 1 MHz. The output noise from the
amplifier is low, with a figure of 30 nV/
√Hz at a frequency of
1 kHz. The broadband noise from the amplifier exhibits a
typical peak-to-peak figure of 150
V for a 1 MHz output
bandwidth. Figure 4 shows a typical plot of noise spectral
density versus frequency for the output buffer amplifier and for
the on-chip reference (including and excluding the decoupling
components).
Figure 4. Noise Spectral Density vs. Frequency
TRANSFER FUNCTION
The basic circuit configuration for the AD7242/AD7244 is
shown in Figure 5. Table I and Table II show the ideal input
code to output voltage relationship for the AD7242 and
AD7244 respectively. Input coding for the AD7242/AD7244 is
2s complement.
Figure 5. Basic Connection Diagram
For the AD7242, the output voltage can be expressed in terms
of the input code, N, using the following relationship:
VOUT =
2
N REF IN
4096
where –2048
≤ N ≤ +2047
For the AD7244, the output voltage can be expressed in terms
of the input code, N, using the following relationship:
VOUT =
2
N REF IN
16384
where –8192
≤ N ≤ +8191
Table I. AD7242 Ideal Input/Output Code Table Code
DAC Latch Contents
MSB
LSB
Analog Output, VOUT*
01 11 1111 1111
+2.998535 V
01 11 1111 1110
+2.99707 V
00 00 0000 0001
+0.001465 V
00 00 0000 0000
0 V
11 11 1111 1111
–0.001465 V
10 00 0000 0001
–2.998535 V
10 00 0000 0000
–3 V
*Assuming REF IN = +3 V.
Table II. AD7244 Ideal Input/Output Code Table Code
DAC Latch Contents
MSB
LSB
Analog Output, VOUT*
01 1111 1111 1111
+2.999634 V
01 1111 1111 1110
+2.99268 V
00 0000 0000 0001
+0.000366 V
00 0000 0000 0000
0 V
11 1111 1111 1111
–0.000366 V
10 0000 0000 0001
–2.999634 V
10 0000 0000 0000
–3 V
*Assuming REF IN = +3 V.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| AD7244JR-REEL | 制造商:Rochester Electronics LLC 功能描述:- Tape and Reel |
| AD7244JRZ | 功能描述:IC DAC 14BIT LC2MOS DUAL 28SOIC 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 |
| AD7244JRZ | 制造商:Analog Devices 功能描述:D/A Converter (D-A) IC |
| AD7244JRZ-REEL | 功能描述:IC DAC 14BIT LC2MOS DUAL 28SOIC 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 |
| AD7244SQ/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 |
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