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PDF XR2008 Data sheet ( Hoja de datos )
| Número de pieza | XR2008 | |
| Descripción | Rail-to-Rail Amplifiers | |
| Fabricantes | Exar | |
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XR1008, XR2008
0.5mA, 75MHz Rail-to-Rail Amplifiers
General Description
The XR1008 (single) and XR2008 (dual) are rail-to-rail output ampli ers that
offer superior dynamic performance with 75MHz small signal bandwidth
and 50V/μs slew rate. The XR1008 and XR2008 ampli ers consume only
505μA of supply current per channel and are designed to operate from a
supply range of 2.5V to 5.5V (±1.25 to ±2.75).
The combination of low power, high output current drive, and rail-to-rail
performance make the XR1008 and XR2008 well suited for battery-powered
metering and test equipment.
The combination of low cost and high performance make these ampli ers
suitable for high volume industrial applications such as ultrasonic heat
meters, water meters and other applications requiring high speed and low
power.
F E AT U R E S
■ 505μA supply current
■ 75MHz bandwidth
■ Input voltage range with 5V supply:
-0.3V to 3.8V
■ Output voltage range with 5V supply:
0.07V to 4.86V
■ 50V/μs slew rate
■ 12nV/√Hz input voltage noise
■ 15mA linear output current
■ Fully specified at 2.7V and 5V supplies
A P P L I C AT I O N S
■ Portable/battery-powered applications
■ Mobile communications, cell phones,
pagers
■ ADC buffer
■ Active lters
■ Portable test instruments
■ Signal conditioning
■ Medical equipment
■ Portable medical instrumentation
■ Flow meters
Ordering Information - back page
Typical Application
+2.7
6.8μF
+
In
RIN
0.1μF
+
XR1008
-
Rf Rg
Out
ROUT
Frequency Response vs. Temperature
0.01 0.1 1 10 100
Frequency (MHz)
© 2014 Exar Corporation
1 / 17
exar.com/XR1008
Rev 1B
1 page  
XR1008 Pin Con gurations
TSOT-5
OUT 1
5 +Vs
-Vs 2
+-
+IN 3
4 -IN
SOIC-8
NC 1
-IN 2
+IN 3
-
+
-Vs 4
8 NC
7 +Vs
6 OUT
5 NC
XR1008, XR2008
XR1008 Pin Assignments
TSOT-5
Pin No.
1
2
3
4
5
Pin Name
OUT
-VS
+IN
-IN
+VS
Description
Output
Negative supply
Positive input
Negative input
Positive supply
SOIC-8
Pin No.
1
2
3
4
5
6
7
8
Pin Name
NC
-IN
+IN
-VS
NC
OUT
+VS
NC
Description
No Connect
Negative input
Positive input
Negative supply
No Connect
Output
Positive supply
No Connect
XR2008 Pin Con guration
SOIC-8 / MSOP-8
OUT1 1
-IN1 2 -
+IN1 3 +
-Vs 4
8 +Vs
7 OUT2
- 6 -IN2
+ 5 +IN2
XR2008 Pin Assignments
SOIC-8 / MSOP-8
Pin No.
1
2
3
4
5
6
7
8
Pin Name
OUT1
-IN1
+IN1
-VS
+IN2
-IN2
OUT2
+VS
Description
Output, channel 1
Negative input, channel 1
Positive input, channel 1
Negative supply
Positive input, channel 2
Negative input, channel 2
Output, channel 2
Positive supply
© 2014 Exar Corporation
5 / 17
exar.com/XR1008
Rev 1B
5 Page 
XR1008, XR2008
Power Dissipation
Power dissipation should not be a factor when operating
under the stated 1kΩ load condition. However, applications
with low impedance, DC coupled loads should be analyzed
to ensure that maximum allowed junction temperature is
not exceeded. Guidelines listed below can be used to verify
that the particular application will not cause the device to
operate beyond it’s intended operating range.
Maximum power levels are set by the absolute maximum
junction rating of 150°C. To calculate the junction
temperature, the package thermal resistance value ThetaJA
(θJA) is used along with the total die power dissipation.
TJunction = TAmbient + (θJA × PD)
Where TAmbient is the temperature of the working
environment.
In order to determine PD, the power dissipated in the load
needs to be subtracted from the total power delivered by the
supplies.
PD = Psupply - Pload
Supply power is calculated by the standard power equation.
Assuming the load is referenced in the middle of the power
rails or Vsupply/2.
The XR1008 is short circuit protected. However, this may not
guarantee that the maximum junction temperature (+150°C)
is not exceeded under all conditions. Figure 6 shows the
maximum safe power dissipation in the package vs. the
ambient temperature for the packages available.
1.5
SOIC-8
1
0.5 MSOP-8
TSOT-5
0
-40
-20
0 20 40 60 80
Ambient Temperature (°C)
100
Figure 6. Maximum Power Derating
120
Psupply = Vsupply × IRMSsupply
Vsupply = VS+ - VS-
Power delivered to a purely resistive load is:
Pload = ((Vload)RMS2)/Rloadeff
The effective load resistor (Rloadeff) will need to include the
effect of the feedback network. For instance,
Driving Capacitive Loads
Increased phase delay at the output due to capacitive loading
can cause ringing, peaking in the frequency response, and
possible unstable behavior. Use a series resistance, RS,
between the ampli er and the load to help improve stability
and settling performance. Refer to Figure 7.
Rloadeff in Figure 3 would be calculated as:
RL || (Rf + Rg)
These measurements are basic and are relatively easy to
perform with standard lab equipment. For design purposes
however, prior knowledge of actual signal levels and load
impedance is needed to determine the dissipated power.
Here, PD can be found from
Input
+
-
Rg
Rf
Rs Output
CL RL
Figure 7. Addition of RS for Driving Capacitive Loads
PD = PQuiescent + PDynamic - Pload
Quiescent power can be derived from the speci ed IS values
along with known supply voltage, Vsupply. Load power can
be calculated as above with the desired signal amplitudes
using:
(Vload)RMS = Vpeak / √2
( Iload)RMS = ( Vload)RMS / Rloadeff
Table 1 provides the recommended RS for various capacitive
loads. The recommended RS values result in approximately
<1dB peaking in the frequency response.
CL (pF)
10pF
20pF
RS (Ω)
0
100
-3dB BW (MHz)
22
19
The dynamic power is focused primarily within the output
stage driving the load. This value can be calculated as:
50pF
100pF
100
100
12
10.2
PDynamic = (VS+ - Vload)RMS × ( Iload)RMS
Table 1: Recommended RS vs. CL
© 2014 Exar Corporation
11 / 17
exar.com/XR1008
Rev 1B
11 Page | ||
| Páginas | Total 17 Páginas | |
| PDF Descargar | [ Datasheet XR2008.PDF ] | |
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