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| 型号： | AD7244AQ |
| 厂商： | ANALOG DEVICES INC |
| 元件分类： | DAC |
| 英文描述： | LC2MOS Dual, Complete, 12-Bit/14-Bit Serial DACs |
| 中文描述： | DUAL, SERIAL INPUT LOADING, 2 us SETTLING TIME, 14-BIT DAC, CDIP24 |
| 封装： | 0.300 INCH, HERMETIC SEALED, CERDIP-24 |
| 文件页数： | 7/12页 |
| 文件大小： | 319K |
| 代理商： | AD7244AQ |
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
μ
s for
the AD7242 and 2.5
μ
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
μ
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:
V
OUT
=
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:
V
OUT
=
2
N
REF IN
where –8192
≤
N
≤
+8191
16384
Table I. AD7242 Ideal Input/Output Code Table Code
DAC Latch Contents
MSB
LSB
Analog Output, V
OUT
*
01 11 1111 1111
01 11 1111 1110
00 00 0000 0001
00 00 0000 0000
11 11 1111 1111
10 00 0000 0001
10 00 0000 0000
+2.998535 V
+2.99707 V
+0.001465 V
0 V
–0.001465 V
–2.998535 V
–3 V
*Assuming REF IN = +3 V.
Table II. AD7244 Ideal Input/Output Code Table Code
DAC Latch Contents
MSB
LSB
Analog Output, V
OUT
*
01 1111 1111 1111
01 1111 1111 1110
00 0000 0000 0001
00 0000 0000 0000
11 1111 1111 1111
10 0000 0000 0001
10 0000 0000 0000
+2.999634 V
+2.99268 V
+0.000366 V
0 V
–0.000366 V
–2.999634 V
–3 V
*Assuming REF IN = +3 V.
相关PDF资料 |
PDF描述 |
|---|---|
| AD7242JN | LC2MOS Dual, Complete, 12-Bit/14-Bit Serial DACs |
| AD7243 | LC2MOS 12-Bit Serial DACPORT |
| AD7243AN | LC2MOS 12-Bit Serial DACPORT |
| AD7243AQ | LC2MOS 12-Bit Serial DACPORT |
| AD7243AR | LC2MOS 12-Bit Serial DACPORT |
相关代理商/技术参数 |
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| AD7244JNZ | 功能描述:IC DAC 14BIT SERIAL W/REF 24DIP 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 |
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| AD7244JR-REEL | 制造商:Rochester Electronics LLC 功能描述:- Tape and Reel |
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