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參數(shù)資料
| 型號： | AD7242JR |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 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, 12-BIT DAC, PDSO28 |
| 封裝： | PLASTIC, SOIC-28 |
| 文件頁數(shù)： | 7/12頁 |
| 文件大?。?/td> | 319K |
| 代理商： | AD7242JR |
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.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| AD7242KR | LC2MOS Dual, Complete, 12-Bit/14-Bit Serial DACs |
| AD7244 | LC2MOS Dual, Complete, 12-Bit/14-Bit Serial DACs |
| AD7244AQ | LC2MOS Dual, Complete, 12-Bit/14-Bit Serial DACs |
| AD7242JN | LC2MOS Dual, Complete, 12-Bit/14-Bit Serial DACs |
| AD7243 | LC2MOS 12-Bit Serial DACPORT |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AD7242KN | 制造商:AD 制造商全稱:Analog Devices 功能描述:LC2MOS Dual, Complete, 12-Bit/14-Bit Serial DACs |
| AD7242KR | 制造商:AD 制造商全稱:Analog Devices 功能描述:LC2MOS Dual, Complete, 12-Bit/14-Bit Serial DACs |
| AD7243 | 制造商:AD 制造商全稱:Analog Devices 功能描述:LC2MOS 12-Bit Serial DACPORT |
| AD7243AN | 功能描述:IC SRL DAC 12BIT LC2MOS 16-DIP RoHS:否 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 數(shù)模轉(zhuǎn)換器 系列:DACPORT® 產(chǎn)品培訓(xùn)模塊:Data Converter Fundamentals DAC Architectures 標(biāo)準(zhǔn)包裝:750 系列:- 設(shè)置時間:7µs 位數(shù):16 數(shù)據(jù)接口:并聯(lián) 轉(zhuǎn)換器數(shù)目:1 電壓電源:雙 ± 功率耗散（最大）:100mW 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:28-LCC（J 形引線） 供應(yīng)商設(shè)備封裝:28-PLCC（11.51x11.51） 包裝:帶卷 (TR) 輸出數(shù)目和類型:1 電壓，單極；1 電壓，雙極 采樣率（每秒）:143k |
| AD7243ANZ | 功能描述:IC SRL DAC 12BIT LC2MOS 16-DIP RoHS:是 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 數(shù)模轉(zhuǎn)換器 系列:DACPORT® 產(chǎn)品培訓(xùn)模塊:Data Converter Fundamentals DAC Architectures 標(biāo)準(zhǔn)包裝:750 系列:- 設(shè)置時間:7µs 位數(shù):16 數(shù)據(jù)接口:并聯(lián) 轉(zhuǎn)換器數(shù)目:1 電壓電源:雙 ± 功率耗散（最大）:100mW 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:28-LCC（J 形引線） 供應(yīng)商設(shè)備封裝:28-PLCC（11.51x11.51） 包裝:帶卷 (TR) 輸出數(shù)目和類型:1 電壓，單極；1 電壓，雙極 采樣率（每秒）:143k |
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