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PDF HA1-2557883 Data sheet ( Hoja de datos )
| Número de pieza | HA1-2557883 | |
| Descripción | Wideband Four Quadrant Analog Multiplier (Current Output) | |
| Fabricantes | Intersil Corporation | |
| Logotipo |  |
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HA2557/883
July 1994
Wideband Four Quadrant Analog
Multiplier (Current Output)
Features
Description
• This Circuit is Processed in Accordance to MIL-STD-
883 and is Fully Conformant Under the Provisions of
Paragraph 1.2.1.
• Low Multiplication Error . . . . . . . . . . . . . . . . 1.5% (Typ)
• Input Bias Currents . . . . . . . . . . . . . . . . . . . . . 8µA (Typ)
• Signal Input Feedthrough at 5MHz. . . . . . . -52dB (Typ)
• Wide Y Channel Bandwidth . . . . . . . . . . 130MHz (Typ)
• Wide X Channel Bandwidth . . . . . . . . . . . 75MHz (Typ)
• Rise Time (RL = 50Ω) . . . . . . . . . . . . . . . . . . . . 7ns (Typ)
• Supply Current . . . . . . . . . . . . . . . . . . . . . . . 17mA (Max)
Applications
• Military Avionics
• Missile Guidance Systems
• Medical Imaging Displays
• Video Mixers
• Sonar AGC Processors
The HA-2557/883 is a monolithic, high speed, four quadrant,
analog multiplier constructed in Intersil’ Dielectrically Iso-
lated High Frequency Process. The single-ended current
output of the HA-2557/883 has a 130MHz signal bandwidth
(RL = 50Ω). High bandwidth and low distortion make this part
an ideal component in video systems.
The suitability for precision video applications is demon-
strated further by low multiplication error (1.5%), low
feedthrough (-52dB), and differential inputs with low bias cur-
rents (8µA). The HA-2557/883 is also well suited for mixer
circuits as well as AGC applications for sonar, radar, and
medical imaging equipment.
The current output of the HA-2557/883 allows it to achieve
higher bandwidths than voltage output multipliers. Full scale out-
put current is trimmed to 1.6mA. An internal 2500Ω feedback
resistor is also provided to accurately convert the current, if
desired, to a full scale output voltage of ±4V. The HA-2557/883 is
not limited to multiplication applications only; frequency doubling,
power detection, as well as many other configurations are also
possible.
Ordering Information
• Radar Signal Conditioning
• Voltage Controlled Amplifier
• Vector Generator
TEMPERATURE
PART NUMBER
RANGE
PACKAGE
HA1-2557/883
-55oC to +125oC 16 Lead CerDIP
Pinout
HA-2557/883
(CERDIP)
TOP VIEW
GND 1
VREF 2
VYIOB 3
VYIOA 4
VY+ 5
VY- 6
V- 7
IOUT 8
REF
YX
16 VXIOA
15 VXIOB
14 NC
13 VX+
X
12 VX-
11 V+
10 RZ
9 NC
Schematic
VBIAS
VX+
VXIO A
VX-
VXIOB
VY+
REF
+
-
GND VYIOA
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
http://www.intersil.com or 407-727-9207 | Copyright © Intersil Corporation 1999
8-12
V+
VBIAS
YY -
IOUT
RZ
VYIOB
V-
Spec Number 511064-883
File Number 3638
1 page  
Test Circuits
1
REF
NC 2
16 NC
15 NC
NC 3
14 NC
NC 4
VY+ 5
Y
6
13 VX+
X
12
X
11 +15V
-15V 7
10 NC
8 9 NC
50Ω
VOUT
HA2557/883
VY TRANSIENT RESPONSE
Vertical Scale: Top 5V/Div. Bottom: 100mV/Div.
Horizontal Scale: 20ns/Div.
FIGURE 1. AC AND TRANSIENT RESPONSE TEST CIRCUIT
Burn-In Circuit
HA-2557/883 CERAMIC DIP
- 15.5V
±0.5V
D1
1
NC 2
NC 3
NC 4
VY+ 5
6
0.01µF 7
8
IOUT
REF
YX
16
15
14
13
X
12
11
10
9
NC
NC
NC
VX+
RZ
NC
D2
+15.5 V
±0.5V
0.01µF
D1 = D2 = 1N4002 OR EQUIVALENT (PER BOARD)
Spec Number 511064-883
8-16
5 Page 
HA2557
DESIGN INFORMATION (Continued)
The information contained in this section has been developed through characterization by Intersil Semiconductor and is for use as
application and design information only. No guarantee is implied.
ACOS(ωτ)
VX +
+
-
VX -
X
1/10KVΩ X
VY +
+
-
VY -
Y
RZ
IOUT
( ACos ( ωτ) × ACos ( ωτ) ) = 10kVΩ ( IOUT)
WHICH EVALUATES TO:
2
IOUT
=
--A------ ( 1 + Cos ( 2ωτ) )
20 K
VY
-15V
1
NC 2
NC 3
NC 4
5
0.01µ
6
1.0µ
IOUT
7
8
REF
16 NC
15 NC
14 NC
13 VX
X 0.01µ
12
YX
11
2.5K
1.0µ
10
RZ 9 NC
3pF
+15V
FIGURE 5. FREQUENCY DOUBLER
Although the X and Y inputs have similar AC characteristics,
they are not the same. The designer should consider input
parameters such as small signal bandwidth and ac
feedthrough to get the most performance from the HA-2557.
The Y channel is the faster of the two inputs with a small sig-
nal bandwidth of typically 130MHz verses 75MHz for the X
channel. Therefore in AM Signal Generation, the best perfor-
mance will be obtained with the Carrier applied to the Y
channel and the modulation signal (lower frequency) applied
to the X channel.
Operation Over a Wide Supply Range
The HA-2557 is able to operate over a wide supply voltage
range ±5V to ±17.5V. The ±5V range is particularly useful in
video applications. At ±5V the input voltage range is reduced
to ±1.4V limiting the fullscale output current. Another current
output option is the HA-2556 voltage output multiplier config-
ured for current output with an output sensing resistor (Refer
to the HA-2556 datasheet).
Automatic Gain Control
Figure 6 shows the HA-2557 configured in an Automatic
Gain Control or AGC application. The HA-2842 serves as an
output I to V converter using RZ which is trimmed to provide
an accurate 4V Fullscale conversion. Refer to Voltage
Output Conversion for more details about this function. The
HA-5127 low noise amplifier provides the gain control signal
to the X input. This control signal sets the peak output volt-
age of the multiplier to match the preset reference level. The
feedback network around the HA-5127 provides a response
time adjustment. High frequency changes in the peak are
rejected as noise or the desired signal to be transmitted.
These signals do not indicate a change in the average peak
value and therefore no gain adjustment is needed. Lower
frequency changes in the peak value are given a gain of -1
for feedback to the control input. At DC the circuit is an inte-
grator automatically compensating for offset and other con-
stant error terms.
-
+
HA-2842
VOUT
1N914
5kΩ
10kΩ
+15V
20kΩ
10kΩ
0.1µF
0.01µF
-
+
HA-5127
0.1µF
5.6V
FIGURE 6. AUTOMATIC GAIN CONTROL
This multiplier has the advantage over other AGC circuits, in
that the signal bandwidth is not affected by the control signal
gain adjustment.
Voltage Output Conversion
The HA-2842 is an excellent choice to perform the output
current to voltage conversion as shown in Figure 7. The
combination of 400V/µs slew rate and 80MHz Gain Band-
width product will maintain signal dynamics while providing a
full scale ±4V output. The HA-2842 also provides a hefty out-
put drive capability of 100mA.
This voltage feedback amplifier takes advantage of the inter-
nal RZ resistor, trimmed to provide an accurate 4V fullscale
conversion. The parasitic capacitance at the negative input
of the HA-2842 must be compensated with a 3pF capacitor
from pin 2 to pin 6. This compensation will also insure that
the amp will see a noise gain of 2 at its crossover frequency,
the minimum required for stability with this device. The full
power bandwidth curve and large signal pulse response for
this circuit are shown in Typical Performance Curves. The
fast slew rate of the HA-2842 results in a minimal reduction
of bandwidth for large signals.
Spec Number 511064-883
8-22
11 Page | ||
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| PDF Descargar | [ Datasheet HA1-2557883.PDF ] | |
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