OP293FS Analog Devices Inc, OP293FS Datasheet - Page 14

• Manufacturer Part Number: OP293FS
• Description: IC OPAMP GP 35KHZ DUAL 8SOIC
• Manufacturer: Analog Devices Inc

Specifications of OP293FS

• Slew Rate: 0.015 V/µs
• Rohs Status: RoHS non-compliant
• Design Resources: 4 mA-to-20 mA Loop-Powered Temperature Monitor Using ADuC7060/1 (CN0145)
• Amplifier Type: General Purpose
• Number Of Circuits: 2
• Output Type: Rail-to-Rail
• Gain Bandwidth Product: 35kHz
• Current - Input Bias: 20nA
• Voltage - Input Offset: 250µV
• Current - Supply: 30µA
• Current - Output / Channel: 25mA
• Voltage - Supply, Single/dual (±): 1.7 V ~ 36 V, ±0.85 V ~ 18 V
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: 8-SOIC (3.9mm Width)
• Op Amp Type: Precision
• No. Of Amplifiers: 2
• Bandwidth: 35kHz
• No. Of Pins: 8
• Operating Temperature Range: -40°C To +125°C
• Peak Reflow Compatible (260 C): No
• Leaded Process Compatible: No
• -3db Bandwidth: -
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

OP193/OP293/OP493
PINS 9(LSB)–16(MSB)
5V
DAC DATA BUS
3.6k
25
24 I
23
4
5
6
I
AD589
I
I
OUT2C/2D
I
OUT2A/2B
1.23V
OUT1B
OUT1C
OUT1D
I
OUT1A
DAC8408ET
DAC8408
DAC8408
DGND
DAC8408
DAC8408
V
DAC C
DAC D
DAC A
DAC B
5V
DD
1/4
1/4
1/4
1/4
1
28
V
V
V
V
REF
REF
REF
REF
A/B
R/W
DS1
DS2
A
B
C
D
2
8
27
21
17
18
19
20
13
12
10
2
3
6
9
5
DIGITAL
CONTROL
SIGNALS
1/4 OP493
1/4 OP493
1/4 OP493
1/4 OP493
OP493
A
B
C
D
5V
4
1
11
14
7
8
R3
100k
R4
100k
R2
100k
V
V
V
V
R1
100k
OUT
OUT
OUT
OUT
B
C
D
A
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 µA (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:
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 MΩ 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.
V
V
OUT
IN
=
256
n