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PDF OPA688 Data sheet ( Hoja de datos )
| Número de pieza | OPA688 | |
| Descripción | Unity Gain Stable / Wideband VOLTAGE LIMITING AMPLIFIER | |
| Fabricantes | Burr-Brown | |
| Logotipo |  |
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®
OPA688
OPA688
For most current data sheet and other product
information, visit www.burr-brown.com
OPA688
TM Unity Gain Stable, Wideband
VOLTAGE LIMITING AMPLIFIER
FEATURES
q HIGH LINEARITY NEAR LIMITING
q FAST RECOVERY FROM OVERDRIVE: 2.4ns
q LIMITING VOLTAGE ACCURACY: ±15mV
q –3dB BANDWIDTH (G = +1): 530MHz
q SLEW RATE: 1000V/µs
q ±5V AND 5V SUPPLY OPERATION
q HIGH GAIN VERSION: OPA689
DESCRIPTION
The OPA688 is a wideband, unity gain stable voltage
feedback op amp that offers bipolar output voltage lim-
iting. Two buffered limiting voltages take control of the
output when it attempts to drive beyond these limits.
This new output limiting architecture holds the limiter
offset error to ±15mV. The op amp operates linearly to
within 30mV of the output limit voltages.
The combination of narrow nonlinear range and low
limiting offset allows the limiting voltages to be set
within 100mV of the desired linear output range. A fast
2.4ns recovery from limiting ensures that overdrive sig-
nals will be transparent to the signal channel. Imple-
menting the limiting function at the output, as opposed to
APPLICATIONS
q FAST LIMITING ADC INPUT BUFFER
q CCD PIXEL CLOCK STRIPPING
q VIDEO SYNC STRIPPING
q HF MIXER
q IF LIMITING AMPLIFIER
q AM SIGNAL GENERATION
q NON-LINEAR ANALOG SIGNAL PROCESSING
q COMPARATOR
the input, gives the specified limiting accuracy for any
gain, and allows the OPA688 to be used in all standard
op amp applications.
Non-linear analog signal processing will benefit from
the OPA688’s sharp transition from linear operation to
output limiting. The quick recovery time supports high
speed applications.
The OPA688 is available in an industry standard pinout
in PDIP-8 and SO-8 packages. For higher gain, or
transimpedance applications requiring output limiting
with fast recovery, consider the OPA689.
2.5
2.0
1.5
1.0
0.5
0
–0.5
–1.0
–1.5
–2.0
–2.5
LIMITED OUTPUT RESPONSE
VH = –VL = 2.0V
G = +2
VIN VO
Time (200ns/div)
DETAIL OF LIMITED OUTPUT VOLTAGE
2.10
2.05
2.00
1.95
1.90
VO
1.85
1.80
1.75
1.70
1.65
1.60
Time (50ns/div)
International Airport Industrial Park • Mailing Address: PO Box 11400, Tucson, AZ 85734 • Street Address: 6730 S. Tucson Blvd., Tucson, AZ 85706 • Tel: (520) 746-1111
Twx: 910-952-1111 • Internet: http://www.burr-brown.com/ • Cable: BBRCORP • Telex: 066-6491 • FAX: (520) 889-1510 • Immediate Product Info: (800) 548-6132
©1997 Burr-Brown Corporation
PDS-11424D
OPA688Printed in U.S.A. January, 2000
®
1 page  
ABSOLUTE MAXIMUM RATINGS
Supply Voltage ................................................................................. ±6.5V
Internal Power Dissipation .......................... See Thermal Characteristics
Common-Mode Input Voltage ............................................................. ±VS
Differential Input Voltage ..................................................................... ±VS
Limiter Voltage Range ........................................................... ±(VS – 0.7V)
Storage Temperature Range: P, U ................................ –40°C to +125°C
Lead Temperature (DIP, soldering, 10s) ..................................... +300°C
(SO-8, soldering, 3s) ...................................... +260°C
Junction Temperature .................................................................... +175°C
PIN CONFIGURATION
Top View
DIP-8, SO-8
ELECTROSTATIC
DISCHARGE SENSITIVITY
Electrostatic discharge can cause damage ranging from perfor-
mance degradation to complete device failure. Burr-Brown Corpo-
ration recommends that all integrated circuits be handled and stored
using appropriate ESD protection methods.
ESD damage can range from subtle performance degradation to
complete device failure. Precision integrated circuits may be more
susceptible to damage because very small parametric changes
could cause the device not to meet published specifications.
NC 1
Inverting Input 2
Non-Inverting Input 3
–VS 4
8 VH
7 +VS
6 Output
5 VL
PACKAGE/ORDERING INFORMATION
PRODUCT
OPA688P
OPA688U
"
PACKAGE
DIP-8 Plastic DIP
SO-8 Surface Mount
"
PACKAGE
DRAWING
NUMBER
006
182
"
SPECIFIED
TEMPERATURE
RANGE
–40°C to +85°C
–40°C to +85°C
"
PACKAGE
MARKING
OPA688P
OPA688U
"
ORDERING
NUMBER(1)
OPA688P
OPA688U
OPA688U/2K5
TRANSPORT
MEDIA
Rails
Rails
Tape and Reel
NOTES: (1) Models with a slash (/) are available only in Tape and Reel in the quantities indicated (e.g., /2K5 indicates 2500 devices per reel). Ordering 2500 pieces
of OPA688U/2K5” will get a single 2500-piece Tape and Reel.
The information provided herein is believed to be reliable; however, BURR-BROWN assumes no responsibility for inaccuracies or omissions. BURR-BROWN assumes
no responsibility for the use of this information, and all use of such information shall be entirely at the user’s own risk. Prices and specifications are subject to change
without notice. No patent rights or licenses to any of the circuits described herein are implied or granted to any third party. BURR-BROWN does not authorize or warrant
any BURR-BROWN product for use in life support devices and/or systems.
®
5 OPA688
5 Page 
TYPICAL APPLICATIONS
DUAL SUPPLY, NON-INVERTING AMPLIFIER
Figure 1 shows a non-inverting gain amplifier for dual
supply operation. This circuit was used for AC characteriza-
tion of the OPA688, with a 50Ω source, which it matches,
and a 500Ω load. The power supply bypass capacitors are
shown explicitly in Figures 1 and 2, but will be assumed in
the other figures. The limiter voltages (VH and VL) and their
bias currents (IVH and IVL) have the polarities shown.
SINGLE SUPPLY, NON-INVERTING AMPLIFIER
Figure 2 shows an AC coupled, non-inverting gain amplifier
for single supply operation. This circuit was used for AC
characterization of the OPA688, with a 50Ω source, which
+VS = +5V
3.01kΩ 1.91kΩ
+
2.2µF
0.1µF
0.1µF
VH = +2V
174Ω
37
VIN 8 IVH
49.9Ω
OPA688 6
RG
402Ω
2
RF
402Ω
4
5 IVL
VO
500Ω
–VS = –5V
0.1µF
0.1µF
VL = –2V
+
2.2µF
3.01kΩ 1.91kΩ
it matches, and a 500Ω load. The power supply bypass
capacitors are shown explicitly in Figures 1 and 2, but will
be assumed in the other figures. The limiter voltages (VH
and VL) and their bias currents (IVH and IVL) have the
polarities shown. Notice that the single supply circuit can
use 3 resistors to set VH and VL, where the dual supply
circuit usually uses 4 to reference the limit voltages to
ground.
LIMITED OUTPUT, ADC INPUT DRIVER
Figure 3 shows a simple ADC driver that operates on single
supply, and gives excellent distortion performance. The
limit voltages track the input range of the converter, com-
pletely protecting against input overdrive.
VS = +5V
+
2.2µF
0.1µF
0.1µF
806Ω
0.1µF
VIN
37
IVH
8
57.6Ω
806Ω OPA688 6
2
4
5
IVL
RF
402Ω
RG
402Ω
0.1µF
0.1µF
523Ω
VH = 3.7V
976Ω
0.1µF
VO
500Ω
VL = 1.3V
523Ω
FIGURE 1. DC-Coupled, Dual Supply Amplifier.
FIGURE 2. AC-Coupled, Single Supply Amplifier.
VS = +5V
VH = +3.6V
0.1µF
VIN
715Ω
VS = +5V
715Ω
37
OPA688 8 6
25
4
24.9Ω
402Ω
402Ω
0.1µF
VL = +1.4V
562Ω
0.1µF
IN
100pF
102Ω
+3.5V
REFT
VS = +5V
RSEL +VS
ADS822
10-Bit
40MSPS
REFB
+1.5V
102Ω
INT/EXT GND
0.1µF
562Ω
10-Bit
Data
FIGURE 3. Single Supply, Limiting ADC Input Driver.
11
OPA688
®
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet OPA688.PDF ] | |
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