OP292GSZ Analog Devices Inc, OP292GSZ Datasheet - Page 14

• Manufacturer Part Number: OP292GSZ
• Description: IC OPAMP GP 4MHZ DUAL 8SOIC
• Manufacturer: Analog Devices Inc

Specifications of OP292GSZ

• Slew Rate: 4 V/µs
• Amplifier Type: General Purpose
• Number Of Circuits: 2
• Gain Bandwidth Product: 4MHz
• Current - Input Bias: 375nA
• Voltage - Input Offset: 1000µV
• Current - Supply: 1mA
• Current - Output / Channel: 10.5mA
• Voltage - Supply, Single/dual (±): 4.5 V ~ 33 V, ±2.25 V ~ 16.5 V
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: 8-SOIC (3.9mm Width)
• Op Amp Type: General Purpose
• No. Of Amplifiers: 2
• Bandwidth: 4MHz
• Supply Voltage Range: 4.5V To 33V
• Amplifier Case Style: SOIC
• No. Of Pins: 8
• Channel Separation: 100
• Common Mode Rejection Ratio: 95
• Current, Input Bias: 450 nA
• Current, Input Offset: 7 nA
• Current, Output: 8 mA
• Current, Supply: 0.8 mA
• Impedance, Thermal: 43 °C/W
• Number Of Amplifiers: Dual
• Package Type: SOIC-8
• Temperature, Operating, Range: -40 to +125 °C
• Voltage, Gain: 200 V/mV
• Voltage, Input: 4 V
• Voltage, Noise: 15 nV/sqrt Hz
• Voltage, Offset: 0.1 mV
• Voltage, Output, High: 4.1 V
• Voltage, Output, Low: 280 mV
• Voltage, Supply: 5 V
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Output Type: -
• -3db Bandwidth: -
• Lead Free Status / Rohs Status: RoHS Compliant part Electrostatic Device

OP292/OP492
TYPICAL APPLICATIONS
DIRECT ACCESS ARRANGEMENT FOR TELEPHONE
LINE INTERFACE
Figure 36 shows a 5 V single-supply transmit/receive telephone line
interface for a modem circuit. It allows full duplex transmission
of modem signals on a transformer-coupled 600 V line in a
differential manner. The transmit section gain can be set for the
specific modem device output. Similarly, the receive amplifier
gain can be appropriately selected based on the modem device
input requirements. The circuit operates on a single 5 V supply.
The standard value resistors allow the use of a SIP-packaged
resistor array; coupled with a quad op amp in a single package,
this offers a compact, low part count solution.
SINGLE-SUPPLY INSTRUMENTATION AMPLIFIER
A low cost, single-supply instrumentation amplifier can be built
as shown in Figure 37. The circuit uses two op amps to form a
high input impedance differential amplifier. Gain can be set by
selecting resistor R
function equation. Normally, V
voltage is a function of the gain times the differential input
voltage. However, the output can be offset by setting V
0 V to 4 V, as long as the input common-mode voltage of the
amplifier is not exceeded.
Figure 36. Universal Direct Access Arrangement for Telephone Line Interface
TO
TELEPHONE
LINE
6.2V
1:1
T1
20kΩ
20kΩ
300kΩ
300kΩ
6.2V
G
20kΩ
, which can be calculated using the transfer
100pF 5kΩ
20kΩ
1/4
OP492
5V
5kΩ
5V DC
0.1µF
20kΩ
20kΩ
50kΩ
REF
1/4
OP492
1/4
OP492
20kΩ
TX GAIN ADJUST
is set to 0 V. Then the output
10µF
RX GAIN ADJUST
50kΩ
20kΩ
0.1µF
0.1µF
TRANSMIT
TXA
MODEM
RECEIVE
RXA
REF
from
Rev. C | Page 14 of 20
In this configuration, the output can swing to near 0 V;
however, be careful because the common-mode voltage range of
the input cannot operate to 0 V. This is because of the limitation
of the circuit configuration where the first amplifier must be able to
swing below ground to attain a 0 V common-mode voltage,
which it cannot do. Depending on the gain of the instrumentation
amplifier, the input common-mode extends to within about 0.3 V
of zero. The worst-case common-mode limit for a given gain
can be easily calculated.
DAC OUTPUT AMPLIFIER
The OP292/OP492 are ideal for buffering the output of single-
supply DACs. Figure 38 shows a typical amplifier used to buffer
the output of a CMOS DAC that is connected for single-supply
operation. To do that, the normally current output 12-bit CMOS
DAC (R-2R ladder type) is connected backward to produce a
voltage output. This operating configuration necessitates a low
voltage reference. In this case, a 1.235 V low power reference is
used. The relatively high output impedance (10 kΩ) is buffered
by the OP292, and at the same time, gained up to a much more
usable level. The potentiometer provides an accurate gain trim
for a 4.095 V full-scale, allowing 1 mV increment per LSB of
control resolution.
The
a cost-effective, compact solution to a 12-bit analog channel.
5V
V
V
REF
7.5kΩ
1.235V
AD589
IN
DAC8043
NC
Figure 38. 12-Bit Single-Supply DAC with Serial Bus Control
1
2
3
4
20kΩ
Figure 37. Single-Supply Instrumentation Amplifier
GND
V
R
I
OUT
REF
FB
DAC8043
device comes in an 8-lead PDIP package, providing
CLK
V DD
V
SRI
OP292
LD
DD
Clk
Sri
1/2
5kΩ
8
7
6
5
LD
1
CONTROL
5V
DIGITAL
SRI
R
G
5kΩ
CLK
500kΩ
5
8.45kΩ
V
OP292
OP292
20kΩ
5V
OUT
1/2
1/2
20kΩ
8
4
5V
= 5 +
7
40kΩ
R
G
1mV/LSB
0V – 4.095V
FS
V
V
+ V
OUT
OUT
REF