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HA2557/883
July 1994
Wideband Four Quadrant Analog Multiplier (Current Output)
Description
The HA-2557/883 is a monolithic, high speed, four quadrant, analog multiplier constructed in Intersil' Dielectrically Isolated High Frequency Process. The single-ended current output of the HA-2557/883 has a 130MHz signal bandwidth (RL = 50). High bandwidth and low distortion make this part an ideal component in video systems. The suitability for precision video applications is demonstrated further by low multiplication error (1.5%), low feedthrough (-52dB), and differential inputs with low bias currents (8A). 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 output current is trimmed to 1.6mA. An internal 2500 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.
Features
* This Circuit is Processed in Accordance to MIL-STD883 and is Fully Conformant Under the Provisions of Paragraph 1.2.1. * Low Multiplication Error . . . . . . . . . . . . . . . . 1.5% (Typ) * Input Bias Currents . . . . . . . . . . . . . . . . . . . . . 8A (Typ) * Signal Input Feedthrough at 5MHz. . . . . . . -52dB (Typ) * Wide Y Channel Bandwidth . . . . . . . . . . 130MHz (Typ) * Wide X Channel Bandwidth . . . . . . . . . . . 75MHz (Typ) * Rise Time (RL = 50) . . . . . . . . . . . . . . . . . . . . 7ns (Typ) * Supply Current . . . . . . . . . . . . . . . . . . . . . . . 17mA (Max)
Applications
* Military Avionics * Missile Guidance Systems * Medical Imaging Displays * Video Mixers * Sonar AGC Processors * Radar Signal Conditioning * Voltage Controlled Amplifier * Vector Generator
Ordering Information
PART NUMBER HA1-2557/883 TEMPERATURE RANGE -55oC to +125oC PACKAGE 16 Lead CerDIP
Pinout
HA-2557/883 (CERDIP) TOP VIEW
GND VREF VYIOB VYIOA VY+ VY VIOUT 1 REF 2 3 4 X 5 Y 6 7 8 X 11 V+ 10 RZ 9 NC 12 VX16 VXIO A 15 VXIOB 14 NC 13 VX+
Schematic
V+
VBIAS VBIAS IOUT VX+ VX VY + REF + YY RZ
VXIO A
VXIOB
GND VYIO A
VYIOB V-
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures. http://www.intersil.com or 407-727-9207 | Copyright (c) Intersil Corporation 1999
Spec Number
8-12
511064-883 File Number 3638
Specifications HA2557/883
Absolute Maximum Ratings
Voltage Between V+ and V- . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35V Differential Input Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6V Output Current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3mA ESD Rating. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . < 2000V Lead Temperature (Soldering 10s) . . . . . . . . . . . . . . . . . . . . +300oC Storage Temperature Range . . . . . . . . . . . . . . -65oC TA +150oC Max Junction Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . +175oC
Thermal Information
Thermal Resistance JA JC CerDIP Package . . . . . . . . . . . . . . . . . . . . 82oC/W 27oC/W Maximum Package Power Dissipation at +75oC CerDIP Package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.22W Package Power Dissipation Derating Factor above +75oC CerDIP Package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12mW/oC
CAUTION: Stresses above those listed in "Absolute Maximum Ratings" may cause permanent damage to the device. This is a stress only rating and operation of the device at these or any other conditions above those indicated in the operational sections of this specification is not implied.
Operating Conditions
Operating Supply Voltage (VS) . . . . . . . . . . . . . . . . . . . . . . . . . . 15V Operating Temperature Range . . . . . . . . . . . . -55oC TA +125oC
TABLE 1. DC ELECTRICAL PERFORMANCE CHARACTERISTICS Device Tested at: VSUPPLY = 15V, RZ (Pin 10) not connected, Unless Otherwise Specified. PARAMETERS Multiplication Error SYMBOL ME CONDITIONS VY, VX = 4V FS = 1.6mA VY, VX = 4V Nominal 2500 GROUP A SUBGROUPS 1 2, 3 1 1 2, 3 IOUT Offset Input Offset Voltage (VX) Input Bias Current (VX) Input Offset Current (VX) Common Mode (VX) Rejection Ratio Power Supply (VX) Rejection Ratio IOO VXIO IB(VX) IIO(VX) CMRR(VX) + PSRR(VX) - PSRR(VX) Input Offset Voltage (VY) Input Bias Current (VY) Input Offset Current (VY) Common Mode (VY) Rejection Ratio Power Supply (VY) Rejection Ratio VYIO IB(VY) IIO(VY) CMRR(VY) + PSRR(VY) - PSRR(VY) Supply Current ICC ZOUT VX, VY = 0V VY = 4V VX = 0V, VY = 4V VX = 0V, VY = 4V VXCM = 10V VY = 4V V+ = +12V to +17V VY = 4V V- = -12V to -17V VY = 4V VX = 4V VY = 0V, VX = 4V VY = 0V, VX = 4V VYCM = +9V, -10V VX = 4V V+ = +12V to +17V VX = 4V V- = -12V to -17V VX = 4V VX, VY = 0V VOUT = 10V 1 2, 3 1 2, 3 1 2, 3 1 2, 3 1 2, 3 1 2, 3 1 2, 3 1 2, 3 1 2, 3 1 2, 3 1 2, 3 1 2, 3 1 2, 3 1 2, 3 Output Impedance 1 LIMITS TEMPERATURE +25oC +125o C, -55 C
o
MIN -3 -6 -0.25 -3 -5 -10 -15 -15 -25 -15 -25 -2 -3 65 65 65 65 45 45 -15 -25 -15 -25 -2 -3 65 65 65 65 45 45 1.0
MAX 3 6 0.25 3 5 10 15 15 25 15 25 2 3 15 25 15 25 2 3 17 17 -
UNITS %FS %FS %FS % % A A mV mV A A A A dB dB dB dB dB dB mV mV A A A A dB dB dB dB dB dB mA mA M
Linearity Error RZ Accuracy
LE RZE
+25oC +25oC +125oC, -55oC +25 C +125oC, -55oC +25 C +125oC, -55oC +25oC +125
oC, o o
-55oC
+25oC +125oC, -55oC +25oC +125
oC,
-55oC
+25oC +125oC, -55oC +25oC +125oC, -55oC +25oC +125oC, -55oC +25oC +125oC, -55oC +25oC +125oC, -55oC +25oC +125
oC,
-55oC -55oC -55oC
+25oC +125
oC,
+25oC +125
oC,
+25oC +125oC, -55oC +25oC
Spec Number 8-13
511064-883
HA2557/883
TABLE 2. AC ELECTRICAL PERFORMANCE CHARACTERISTICS
Table 2 Intentionally Left Blank. See AC Specifications in Table 3
TABLE 3. ELECTRICAL PERFORMANCE CHARACTERISTICS Device Tested at: VSUPPLY = 15V, RZ (Pin 10) not connected, Unless Otherwise Specified. LIMITS PARAMETERS VY, CHARACTERISTICS Bandwidth AC Feedthrough BW(VY) VISO -3dB, VX = 4V, VY 200mVP-P fO = 5MHz, VY = 200mVP-P VX = Nulled VY = -4V to +4V Step VX = 4V, 10% to 90% pts VY = -4V to +4V Step VX = 4V VY = 4V, VX = 0V 1 1, 2 +25oC +25oC 90 -48 MHz dB SYMBOL CONDITIONS NOTES TEMPERATURE MIN MAX UNITS
Rise and Fall Time
TR, TF
1
+25oC
-
10
ns
Overshoot Differential Input Resistance VX CHARACTERISTICS Bandwidth AC Feedthrough
+OS, -OS RIN(VY)
1 1
+25oC +25oC
650
10 -
% k
BW(VX) VISO
-3dB, VY = 4V, VX 200mVP-P fO = 5MHz, VX = 200mVP-P VY = Nulled VX = -4V to +4V Step VY = 4V, 10% to 90% pts VX = -4V to +4V Step VY = 4V VX = 4V, VY = 0V
1 1, 2
+25oC +25oC
60 -
-50
MHz dB
Rise and Fall Time Overshoot Differential Input Resistance NOTE:
TR, TF +OS, -OS RIN(VX)
1 1 1
+25oC +25oC +25oC
650
10 15 -
ns % k
1. Parameters listed in Table 3 are controlled via design or process parameters and are not directly tested at final production. These parameters are lab characterized upon initial design release, or upon design changes. These parameters are guaranteed by characterization based upon data from multiple production runs which reflect lot to lot and within lot variation. 2. Offset voltage applied to minimize feedthrough signal. TABLE 4. ELECTRICAL TEST REQUIREMENTS MIL-STD-883 TEST REQUIREMENTS Interim Electrical Parameters (Pre Burn-In) Final Electrical Test Parameters Group A Test Requirements Groups C and D Endpoints NOTE: 1. PDA applies to Subgroup 1 only. SUBGROUPS (SEE TABLE 1) 1 (Note 1), 2, 3 1, 2, 3 1
Spec Number 8-14
511064-883
HA2557/883 Die Characteristics
DIE DIMENSIONS: 71mils x 100mils x 19mils 1mils METALLIZATION: Type: Al, 1% Cu Thickness: 16kA 2kA GLASSIVATION: Type: Nitride (Si3N4) over Silox (SiO2, 5% Phos) Silox Thickness: 12kA 2kA Nitride Thickness: 3.5kA 1.5kA TRANSISTOR COUNT: 72 SUBSTRATE POTENTIAL: VWORST CASE CURRENT DENSITY: 0.47 x 105A/cm2
Metallization Mask Layout
HA-2557/883
(16) VXIOA
VYIOB (3) VYIOA (4)
(15) VXIOB (13) VX+ (12) VX (11) V+ RZ (10)
(2) VREF VY+ (5) VY - (6)
(1) GND IOUT (8)
V- (7)
Spec Number 8-15
511064-883
HA2557/883 Test Circuits
VY TRANSIENT RESPONSE Vertical Scale: Top 5V/Div. Bottom: 100mV/Div. Horizontal Scale: 20ns/Div.
1 REF NC NC NC VY + 2 3 4 X 5 Y 6 -15V 7 8 VOUT 50 X 11 10 9 +15V NC NC 12 16 15 14 13 NC NC NC VX+
FIGURE 1. AC AND TRANSIENT RESPONSE TEST CIRCUIT
Burn-In Circuit
HA-2557/883 CERAMIC DIP
1 REF NC NC NC VY+ 2 3 4 X 5 Y 6 - 15.5V 0.5V D1 0.01F IOUT 7 8 X
16 15 14 13 12 11 10 9
NC NC NC VX+
RZ NC
+15.5 V 0.5V D2 0.01F
D1 = D2 = 1N4002 OR EQUIVALENT (PER BOARD)
Spec Number 8-16
511064-883
HA2557/883 Packaging
c1 -A-DBASE METAL E b1 M -Bbbb S BASE PLANE SEATING PLANE S1 b2 b ccc M C A-B S AA C A-B S D Q -CA L DS M (b) SECTION A-A (c) LEAD FINISH
F16.3 MIL-STD-1835 GDIP1-T16 (D-2, CONFIGURATION A)
16 LEAD DUAL-IN-LINE FRIT-SEAL CERAMIC PACKAGE INCHES SYMBOL A b b1 b2 b3 c c1 MIN 0.014 0.014 0.045 0.023 0.008 0.008 0.220 MAX 0.200 0.026 0.023 0.065 0.045 0.018 0.015 0.840 0.310 MILLIMETERS MIN 0.36 0.36 1.14 0.58 0.20 0.20 5.59 MAX 5.08 0.66 0.58 1.65 1.14 0.46 0.38 21.34 7.87 2.54 BSC 7.62 BSC 3.81 BSC 3.18 0.38 0.13 0.13 90o 16 5.08 1.52 105o 0.38 0.76 0.25 0.038 NOTES 2 3 4 2 3 5 5 6 7 2 8
eA
D E e eA eA/2 L Q
0.100 BSC 0.300 BSC 0.150 BSC 0.125 0.015 0.005 0.005 90o 16 0.200 0.060 105o 0.015 0.030 0.010 0.0015
e
DS
eA/2
c
aaa M C A - B S D S
NOTES: 1. Index area: A notch or a pin one identification mark shall be located adjacent to pin one and shall be located within the shaded area shown. The manufacturer's identification shall not be used as a pin one identification mark. 2. The maximum limits of lead dimensions b and c or M shall be measured at the centroid of the finished lead surfaces, when solder dip or tin plate lead finish is applied. 3. Dimensions b1 and c1 apply to lead base metal only. Dimension M applies to lead plating and finish thickness. 4. Corner leads (1, N, N/2, and N/2+1) may be configured with a partial lead paddle. For this configuration dimension b3 replaces dimension b1. 5. This dimension allows for off-center lid, meniscus, and glass overrun. 6. Dimension Q shall be measured from the seating plane to the base plane. 7. Measure dimension S1 at all four corners. 8. N is the maximum number of terminal positions. 9. Dimensioning and tolerancing per ANSI Y14.5M - 1982. 10. Controlling Dimension: Inch. 11. Lead Finish: Type A. 12. Materials: Compliant to MIL-M38510.
S1 S2
aaa bbb ccc M N
Spec Number 8-17
511064-883
Semiconductor
HA2557
Wideband Four Quadrant Current Output Analog Multiplier
VX BANDWIDTH
-32
DESIGN INFORMATION
August 1999
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.
Typical Performance Curves
VY BANDWIDTH
-32
GAIN (dB)
-37
GAIN (DB)
-3dB AT 77MHz -37
IOUT INTO 50 VY BANDWIDTH VY = 200MVP-P , VX = 4VDC -42 1M 10M FREQUENCY (Hz)
-3dB at 131MHz IOUT INTO 50 VX BANDWIDTH VX = 200mVP-P VY = 4VDC 100M -42 1M 10M FREQUENCY (Hz) 100M
HA2557 INTO HA2842 AS I TO V CONVERTER VY FULLPOWER BANDWIDTH
4 2 GAIN (dB) 0 -2 -4 -6 1K -3dB at 24.4MHz INTERNAL RX AS FEEDBACK RESISTOR, PLUS 3pF COMPENSATION CAPACITOR VY = 3.5VP-P , VX = 4VDC
VY TRANSIENT RESPONSE OF HA-2842 AS I TO V CONVERTER Top: VY Input 0 to 4V Step Bottom: HA-2842 0 to 4V Response
10K
100K
1M
10M
100M
FREQUENCY (Hz)
Spec Number 8-18
511064-883
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.
Typical Performance Curves
DRIVING HA5023 AS I TO V CONVERTER VY BANDWIDTH
4 FIRST STAGE USING A 909 FEEDBACK RESISTOR, OUTPUT OF SECOND STAGE (AMP 2) WITH 619 FEEDBACK RESISTOR AND 220 GAIN RESISTOR IN PARALLEL WITH A 10pF 2 PLUS 220, VY = 200mVP-P, VX = 4VDC GAIN (dB) 0 -2 -4 1M 10M FREQUENCY (Hz) 100M -3dB at 94MHz
VY TRANSIENT RESPONSE OF HA5023 AS I TO V CONVERTER Top: VY Input 0 to 4V Step Bottom: HA5023 0 to 4V Response
DRIVING HA5023 AS I TO V CONVERTER VX BANDWIDTH
FIRST STAGE USING A 909 FEEDBACK RESISTOR, OUTPUT OF SECOND STAGE (AMP 2) WITH 619 FEEDBACK RESISTOR AND 220 GAIN RESISTOR IN PARALLEL WITH A 2 10pF PLUS 220, VX = 200mVP-P , VY = 4VDC 4 GAIN (dB) 0 -2 -4 1M 10M FREQUENCY (Hz) 100M -3dB at 98MHz
VY TRANSIENT RESPONSE OF HA5023 AS I TO V CONVERTER Top: VX Input 0 to 4V Step Bottom: HA5023 0 to 4V Response
DRIVING HA5023 AS I TO V CONVERTER VY FULLPOWER BANDWIDTH
FIRST STAGE USING A 909 FEEDBACK RESISTOR OUTPUT OF SECOND STAGE (AMP 2) WITH 619 FEEDBACK RESISTOR AND 220 GAIN RESISTOR IN PARALLEL WITH A 10pF 2 PLUS 220, VY = 3.5VP-P , VX = 4VDC 4 GAIN (dB) GAIN (dB) 0 -2 -4 1M 10M FREQUENCY (Hz) 100M -3dB at 80MHz
DRIVING HA5023 AS I TO V CONVERTER VX FULLPOWER BANDWIDTH
FIRST STAGE USING A 909 FEEDBACK RESISTOR OUTPUT OF SECOND STAGE (AMP 2) WITH 619 FEEDBACK RESISTOR AND 220 GAIN RESISTOR IN PARALLEL WITH A 10pF 2 PLUS 220, VX = 3.5VP-P , VY = 4VDC 4 0 -2 -4 1M 10M FREQUENCY (Hz) 100M -3dB at 80MHz
Spec Number 8-19
511064-883
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.
Typical Performance Curves
INPUT BIAS CURRENT
14 13 12 BIAS CURRENT (A) 11 10 9 8 7 6 5 4 -100 -50 0 50 TEMPERATURE (oC) 100 150 OFFSET VOLTAGE (mV) 7 6 5 4 3 2 1 0 -100 |VIOY| -50 0 50 TEMPERATURE (oC) 100 150 |VIOX|
ABSOLUTE VALUE OFFSET VOLTAGE
SCALE FACTOR ERROR
2 INPUT VOLTAGE RANGE (V) 1.5 1 0.5 0 -0.5 -1 -100 6
INPUT VOLTAGE RANGE
SCALE FACTOR ERROR (%)
5 X INPUT 4 Y INPUT
3
2
1 -50 0 50 TEMPERATURE (oC) 100 150 4 6 8 10 12 14 16 SUPPLY VOLTAGE (V)
INPUT COMMON MODE RANGE
15 10 X INPUT 5 CMR (V) 0 -5 X AND Y INPUT -10 -15 Y INPUT
4
6
8 10 12 SUPPLY VOLTAGE (V)
14
16
Spec Number 8-20
511064-883
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.
Applications Information
Operation at Reduced Supply Voltages The HA-2557 will operate over a range of supply voltages, 5V to 15V. Use of supply voltages below 12V will reduce input and output voltage ranges. See "Typical Performance Curves" for more information. Offset Adjustment The channel offset voltage may be nulled by using a 20K potentiometer between the VYIO or VXIO adjust pin A and B and connecting the wiper to V-. Reducing the channel offset voltage will reduce AC feedthrough and improve the multiplication error. products where one input was dedicated to a slow moving control function as is required for Automatic Gain Control. The HA-2557 is versatile enough for both.
ACOS() AUDIO
VX+ +
-
VX1/10kV CCOS(C) VY+ CARRIER VYI OUT +
X X Y RZ IOUT
Theory of Operation
The HA-2557 creates an output current that is the product of the X and Y input voltages divided by a constant scale factor of 10kV. The resulting output has the correct polarity in each of the four quadrants defined by the combinations of positive and negative X and Y inputs. This results in the following equation, where X and Y are high impedance differential inputs:
I OUT XxY = -----------10kV
-
= -------------- ( Cos ( C - A ) + Cos ( C + A ) )
20kV
AC
FIGURE 2. AM SIGNAL GENERATION
VX + AM SIGNAL VX +
-
To accomplish this the differential input voltages are first converted into differential currents by the X and Y input transconductance stages. The currents are then scaled by a constant reference and combined in the multiplier core. The multiplier core is a basic Gilbert Cell that produces a differential output current proportional to the product of X and Y input signal currents. This current is converted into the output for the HA-2557. The purpose of the reference circuit is to provide a stable current, used in setting the scale factor. This is achieved with a bandgap reference circuit to produce a temperature stable voltage of 1.2V which is forced across a NiCr resistor. Slight adjustments to scale factor may be possible by overriding the internal reference with the VREF pin. The scale factor is used to maintain the output of the multiplier within the normal operating range of 1.6mA when full scale inputs are applied.
X X Y RZ IOUT
1/10KV CARRIER VY + +
-
VY LIKE THE FREQUENCY DOUBLER YOU GET AUDIO CENTERED AT DC AND 2FC .
FIGURE 3. SYNCHRONOUS AM DETECTION
ACOS()
VX+ + VX -
-
X IOUT X Y RZ
Communications
ACOS(+)
1/10kV VY+ VY 2 +
The multiplier function of the HA-2557 has applications in AM Signal Generation, Synchronous AM Detection and Phase Detection. These circuit configurations are shown in Figure 2, Figure 3 and Figure 4. By feeding a signal into both X and Y inputs a Square function results that is useful as a Frequency Doubler as shown in Figure 5. The HA-2557 is particularly useful in applications that require the interaction of high speed signals. Both inputs X and Y have similar wide bandwidth and input characteristics. This is unlike earlier
-
I
OUT
A = -------------- ( Cos ( ) + Cos ( 2 + ) ) 20kV
DC COMPONENT IS PROPORTIONAL TO COS()
FIGURE 4. PHASE DETECTION
Spec Number 8-21
511064-883
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() VX + + VX 1 X IOUT X Y RZ VY 0.01 6 10kV ( I REF NC NC NC 2 3 4 X 5 Y 7 IOUT 2 8 3pF RZ X 2.5K 11 10 9 NC 1.0 +15V 16 NC 15 NC 14 NC VX 13 0.01 12
-
1/10KV VY + VY +
-
( ACos ( ) x ACos ( ) ) =
WHICH EVALUATES TO: I OUT A = -------- ( 1 + Cos ( 2 ) ) 20K
OUT
)
-15V
1.0
FIGURE 5. FREQUENCY DOUBLER
+
-
VOUT HA-2842
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 signal bandwidth of typically 130MHz verses 75MHz for the X channel. Therefore in AM Signal Generation, the best performance will be obtained with the Carrier applied to the Y channel and the modulation signal (lower frequency) applied to the X channel.
10k 1N914 10k +15V 0.01F +
0.1F
-
5k
HA-5127 20k 0.1F
5.6V
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 configured for current output with an output sensing resistor (Refer to the HA-2556 datasheet).
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.
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 voltage 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 integrator automatically compensating for offset and other constant error terms.
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/s slew rate and 80MHz Gain Bandwidth product will maintain signal dynamics while providing a full scale 4V output. The HA-2842 also provides a hefty output drive capability of 100mA. This voltage feedback amplifier takes advantage of the internal 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 8-22
511064-883
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.
Another choice for an I to V converter that takes better advantage of the wide bandwidth of the HA-2557, is to use the HA5023 Dual 100MHz current feedback amp. The optimum bandwidth of a current feedback amp is obtained with a fixed feedback resistor. Therefore scaling the I to V conversion to a convenient value requires two stages. Fortunately the HA5023 provides two wideband amplifiers in a single 8 pin Mini-DIP or SOIC package, while their current feedback architecture provides signal gain with minimal reduction in bandwidth. This circuit configuration is shown in Figure 8.
The optimum bandwidth is achieved in stage 1 with a 909 feedback resistor. This voltage is then gained up by the second stage to provide a 4V Fullscale Voltage output with a bandwidth in excess of 90MHz. The 10pF capacitor and the additional 220 resistor improve gain flatness and reduce gain peaking. The HA5023 also provides excellent Full Power Bandwidth (-3dB at 80MHz for a 3.5VP-P signal). Refer to Typical Performance Curves for more information.
1 REF NC NC NC VY 0.01 6 -15V 1.0 IOUT 7 8 3pF RZ 2 3 4 X 5 Y X 2.5K
16 NC 15 NC 14 NC 13 12 11 1.0 10 9 NC IOUT 0.01 VY +15V -15V 0.01 VX NC NC NC
1 REF 2 3 4 X 5 Y 6 2.5K 1.0 7 RZ 8 10pF X
16 NC 15 NC 14 NC 13 12 11 10 NC 9 NC 0.01 +15V VX
1.0
909 2 HA-2842 3
220 6 5
619 2 of 2
+
-
6 0.01 1.0 0.01 1.0
VOUT
2 HA5023 3 (1/2) 8
+ 4
-
1 of 2 1
220 0.01 1.0 0.01 1.0
+ HA5023 (1/2)
-
8
VOUT
+15V -15V
+15V -15V
FIGURE 7. VOLTAGE OUTPUT CONVERSION
FIGURE 8. VOLTAGE OUTPUT CONVERSION
Spec Number 8-23
511064-883
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.
TYPICAL PERFORMANCE CHARACTERISTICS Device Tested at VSUPPLY = 15V, RZ (Pin 10) Not Connected, Unless Otherwise Specified. PARAMETERS Multiplication Error SYMBOL ME CONDITIONS VY, VX = 4V TEMPERATURE +25oC +125oC, -55oC Multiplication Error Drift Linearity Error METC LE3V LE4V Scale Factor Voltage Noise SF EN(1kHz) EN(100kHz) Positive Power Supply Rejection Ratio +PSRR f = 1kHz, VX = 0V, VY = 0V f = 100kHz, VX = 0V, VY = 0V VS+ = +12V to +15V, VS - = -15V VY, VX = 4V VY, VX = 3V VY, VX = 4V +125oC, -55oC +25oC +25oC +25oC +25oC +25oC +25oC +125oC, -55oC +25oC +125oC, -55oC +25oC +125oC, -55oC INPUT CHARACTERISTICS Input Offset Voltage VIO VY = 4V +25oC +125oC, -55oC Input Offset Voltage Drift Input Bias Current VIOTC IB VY = 4V VX = 0V, VY = 4V +125oC, -55oC +25oC +125oC, -55oC Input Offset Current IIO VX = 0V, VY = 4V +25oC +125oC, -55oC Differential Input Range +25oC 4 8 35 8 12 0.5 1.0 4 mV mV V/oC A A A A V TYPICAL 1.5 3.0 0.003 0.02 0.05 10 150 40 80 80 55 55 13 13 UNITS %FS %FS %FS/oC %FS %FS kV nV/Hz nV/Hz dB dB dB dB mA mA
Negative Power Supply Rejection Ratio
-PSRR
VS - = -12V to -15V, VS+ = +15V
Supply Current
ICC
VX, VY = 0V
Spec Number 8-24
511064-883
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.
TYPICAL PERFORMANCE CHARACTERISTICS Device Tested at VSUPPLY = 15V, RZ (Pin 10) Not Connected, Unless Otherwise Specified. PARAMETERS VY CHARACTERISTICS Bandwidth AC Feedthrough BW(VY) VISO(5MHz) -3dB, VX = 4V, VY 200mVP-P fO = 5MHz, VY = 200mVP-P VX = Nulled (Note 1) VY = -4V to +4V Step, VX = 4V, 10% to 90% pts VY = 4V, VX = 0V +25oC +25oC 130 -52 MHz dB SYMBOL CONDITIONS TEMPERATURE TYPICAL UNITS
Rise and Fall Time
TR, TF
+25oC
7
ns
Differential Input Resistance VX CHARACTERISTICS Bandwidth
RIN(VY)
+25oC
1
M
BW(VX)
-3dB, VY = 4V, VX 200mVP-P fO = 5MHz, VX = 200mVP-P VY = nulled (Note 1) VX = -4V to +4V step, VY = 4V, 10% to 90% pts VX = 4V, VY = 0V
+25oC
75
MHz
AC Feedthrough
VISO(5MHz)
+25oC
-54
dB
Rise and Fall Time
TR, TF
+25oC
7
ns
Differential Input Resistance OUTPUT CHARACTERISTICS Output Offset Current
RIN(VX)
+25oC
1
M
IOO
VX, VY = 0V
+25oC +125oC, -55oC
2.4 5.6 1.6 1.5 6.5
A A mA M pF
Full Scale Output Current Output Resistance Output Capacitance NOTE:
IOUTFS ZOUT COUT
VX, VY = 4V VOUT = 10V
+25oC +25oC +25oC
1. Offset voltage applied to minimize feedthrough signal.
All Intersil semiconductor products are manufactured, assembled and tested under ISO9000 quality systems certification.
Intersil products are sold by description only. Intersil Corporation reserves the right to make changes in circuit design and/or specifications at any time without notice. Accordingly, the reader is cautioned to verify that data sheets are current before placing orders. Information furnished by Intersil is believed to be accurate and reliable. However, no responsibility is assumed by Intersil or its subsidiaries for its use; nor for any infringements of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Intersil or its subsidiaries.
For information regarding Intersil Corporation and its products, see web site http://www.intersil.com
Spec Number 8-25
511064-883

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