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參數(shù)資料
| 型號： | OP293FSZ-REEL7 |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 6/16頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC OPAMP GP 35KHZ DUAL 8SOIC |
| 設(shè)計資源： | 4 mA-to-20 mA Loop-Powered Temperature Monitor Using ADuC7060/1 (CN0145) |
| 標準包裝： | 1 |
| 放大器類型： | 通用 |
| 電路數(shù)： | 2 |
| 輸出類型： | 滿擺幅 |
| 轉(zhuǎn)換速率： | 0.015 V/µs |
| 增益帶寬積： | 35kHz |
| 電流 - 輸入偏壓： | 20nA |
| 電壓 - 輸入偏移： | 250µV |
| 電流 - 電源： | 30µA |
| 電流 - 輸出 / 通道： | 25mA |
| 電壓 - 電源，單路/雙路(±)： | 1.7 V ~ 36 V，±0.85 V ~ 18 V |
| 工作溫度： | -40°C ~ 125°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 8-SOIC（0.154"，3.90mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 8-SOIC |
| 包裝： | 標準包裝 |
| 產(chǎn)品目錄頁面： | 768 (CN2011-ZH PDF) |
| 其它名稱： | OP293FSZ-REEL7DKR |
REV. B
OP193/OP293/OP493
–14–
VOUTA
1/4 OP493
A
2
3
R1
100k
11
1
2
VREFA
IOUT1A
IOUT1B
4
5
6
IOUT2A/2B
DAC A
1/4
DAC8408
DAC B
1/4
DAC8408
IOUT1C
DAC C
1/4
DAC8408
IOUT1D
DAC D
1/4
DAC8408
VOUTB
1/4 OP493
B
6
5
R2
100k
7
8
VREFB
VOUTC
1/4 OP493
C
13
12
R3
100k
14
27
VREFC
VOUTD
1/4 OP493
D
9
10
R4
100k
8
21
VREFD
DAC DATA BUS
PINS 9(LSB)–16(MSB)
24 IOUT2C/2D
23
25
5V
1
VDD
AD589
1.23V
5V
17
18
19
20
A/B
R/
W
DS1
DS2
DAC8408ET
DIGITAL
CONTROL
SIGNALS
28
DGND
OP493
4
5V
3.6k
Figure 13. Micropower Single-Supply Quad Voltage-
Output 8-Bit DAC
A Single-Supply Micropower Quad Programmable-Gain
Amplifier
The combination of the quad OP493 and the DAC8408 quad
8-bit CMOS DAC creates a quad programmable-gain amplifier
with a quiescent supply drain of only 140
A (Figure 14). The
digital code present at the DAC, which is easily set by a micro-
processor, determines the ratio between the fixed DAC feedback
resistor and the resistance that the DAC feedback ladder pre-
sents to the op amp feedback loop. The gain of each amplifier is:
V
Vn
OUT
IN
=
256
where n equals the decimal equivalent of the 8-bit digital code
present at the DAC.
If the digital code present at the DAC consists of all zeros, the
feedback loop will be open causing the op amp to saturate. The
10 M
resistors placed in parallel with the DAC feedback loop
eliminates this problem with a very small reduction in gain
accuracy. The 2.5 V reference biases the amplifiers to the center
of the linear region providing maximum output swing.
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