HA-5320 Data Sheet 1 Microsecond Precision Sample and Hold Amplifier The HA-5320 was designed for use in precision, high speed data acquisition systems. The circuit consists of an input transconductance amplifier capable of providing large amounts of charging current, a low leakage analog switch, and an output integrating amplifier. The analog switch sees virtual ground as its load; therefore, charge injection on the hold capacitor is constant over the entire input/output voltage range. The pedestal voltage resulting from this charge injection can be adjusted to zero by use of the offset adjust inputs. The device includes a hold capacitor. However, if improved droop rate is required at the expense of acquisition time, additional hold capacitance may be added externally. This monolithic device is manufactured using the Intersil Dielectric Isolation Process, minimizing stray capacitance and eliminating SCRs. This allows higher speed and latchfree operation. For further information, please see Application Note AN538. April 1999 File Number 2857.4 Features • Gain, DC. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 x 106 V/V • Acquisition Time . . . . . . . . . . . . . . . . . . . . . 1.0µs (0.01%) • Droop Rate . . . . . . . . . . . . . . . . . . . . . . 0.08µV/µs (25oC) 17µV/µs (Full Temperature) • Aperture Time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25ns • Hold Step Error (See Glossary) . . . . . . . . . . . . . . . . . 5mV • Internal Hold Capacitor • Fully Differential Input • TTL Compatible Applications • Precision Data Acquisition Systems • Digital to Analog Converter Deglitcher • Auto Zero Circuits • Peak Detector Pinouts Ordering Information HA-5320 (PDIP, CERDIP) TOP VIEW -INPUT 1 14 S/H CONTROL +INPUT 2 13 SUPPLY GND OFFSET ADJUST 3 12 NC OFFSET ADJUST 4 11 CEXT V- 5 10 NC SIG. GND 6 9 V+ -55 to 25 14 Ld CERDIP F14.3 HA1-5320-5 0 to 75 14 Ld CERDIP F14.3 HA3-5320-5 0 to 75 14 Ld PDIP E14.3 HA9P5320-5 0 to 75 16 Ld SOIC M16.3 HA9P5320-9 -40 to 85 16 Ld SOIC M16.3 Functional Diagram OFFSET ADJUST 3 V+ 9 4 HA-5320 (SOIC) TOP VIEW 100pF HA-5320 -INPUT 1 -INPUT 1 16 S/H CONTROL +INPUT 2 15 SUPPLY GND OFFSET ADJUST 3 14 NC OFFSET ADJUST 4 13 CEXT V- 5 11 V+ INTEGRATOR 10 BANDWIDTH OUTPUT 7 9 NC NC 8 - +INPUT 2 7 + OUTPUT S/H CONTROL 14 12 NC SIG. GND 6 PKG. NO. PACKAGE HA1-5320-2 INTEGRATOR 8 BANDWIDTH OUTPUT 7 TEMP. RANGE (oC) PART NUMBER 13 5 SUPPLY GND V- 6 8 INTEGRATOR BANDWIDTH SIG. GND 11 CEXT 1 CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures. 1-888-INTERSIL or 321-724-7143 | Copyright © Intersil Corporation 1999 HA-5320 Absolute Maximum Ratings Thermal Information Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .40V Differential Input Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .24V Digital Input Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +8V, -15V Output Current, Continuous (Note 1) . . . . . . . . . . . . . . . . . . . ±20mA Thermal Resistance (Typical, Note 3) θJA (oC/W) θJC (oC/W) CERDIP Package. . . . . . . . . . . . . . . . . 70 18 PDIP Package . . . . . . . . . . . . . . . . . . . 75 N/A SOIC Package . . . . . . . . . . . . . . . . . . . 90 N/A Maximum Junction Temperature (Ceramic Package) . . . . . . . . .175oC Maximum Junction Temperature (Plastic Package) . . . . . . . .150oC Maximum Storage Temperature Range . . . . . . . . . . -65oC to 150oC Maximum Lead Temperature (Soldering 10s) . . . . . . . . . . . . 300oC (SOIC - Lead Tips Only) Operating Conditions Temperature Range HA-5320-2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -55oC to 125oC HA-5320-5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0oC to 75oC HA-5320-9 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -40oC to 85oC Supply Voltage Range (Typical, Note 2) . . . . . . . . . ±13.5V to ±20V 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. NOTES: 1. Internal Power Dissipation may limit Output Current below 20mA. 2. Specification based on a one time characterization. This parameter is not guaranteed. 3. θJA is measured with the component mounted on an evaluation PC board in free air. VSUPPLY = ±5.0V; CH = Internal; Digital Input: VIL = +0.8V (Sample), VIH = +2.0V (Hold), Unity Gain Configuration (Output tied to -Input), Unless Otherwise Specified Electrical Specifications TEST CONDITIONS HA-5320-2/-9 HA-5320-5 TEMP. (oC) MIN TYP MAX MIN TYP MAX UNITS Input Voltage Range Full ±10 - - ±10 - - V Input Resistance 25 1 5 - 1 5 - MΩ Input Capacitance 25 - - 5 - - 5 pF Offset Voltage 25 - 0.2 - - 0.5 - mV Full - - 2.0 - - 1.5 mV 25 - 70 200 - 100 300 nA Full - - 200 - - 300 nA 25 - 30 100 - 30 300 nA Full - - 100 - - 300 nA Full ±10 - - ±10 - - V PARAMETER INPUT CHARACTERISTICS Bias Current Offset Current Common Mode Range VCM = ±5V CMRR Offset Voltage Temperature Coefficient 25 80 90 - 72 90 - dB Full - 5 15 - 5 20 µV/ oC TRANSFER CHARACTERISTICS Gain DC, (Note 12) 25 106 2 x 106 - 3 x 105 2 x 106 - V/V Gain Bandwidth Product (AV = +1, Note 5) CH = 100pF 25 - 2.0 - - 2.0 - MHz CH = 1000pF 25 - 0.18 - - 0.18 - MHz Output Voltage Full ±10 - - ±10 - - V Output Current 25 ±10 - - ±10 - - mA OUTPUT CHARACTERISTICS Full Power Bandwidth Note 4 25 - 600 - - 600 - kHz Output Resistance Hold Mode 25 - 1.0 - - 1.0 - Ω Total Output Noise (DC to 10MHz) Sample 25 - 125 200 - 125 200 µVRMS Hold 25 - 125 200 - 125 200 µVRMS 2 HA-5320 VSUPPLY = ±5.0V; CH = Internal; Digital Input: VIL = +0.8V (Sample), VIH = +2.0V (Hold), Unity Gain Configuration (Output tied to -Input), Unless Otherwise Specified (Continued) Electrical Specifications TEST CONDITIONS PARAMETER HA-5320-2/-9 HA-5320-5 TEMP. (oC) MIN TYP MAX MIN TYP MAX UNITS TRANSIENT RESPONSE Rise Time Note 5 25 - 100 - - 100 - ns Overshoot Note 5 25 - 15 - - 15 - % Slew Rate Note 6 25 - 45 - - 45 - V/µs VIH Full 2.0 - - 2.0 - - V VIL Full - - 0.8 - - 0.8 V VIL = 0V 25 - - 4 - - 4 µA Full - - 10 - - 10 µA Full - - 0.1 - - 0.1 µA To 0.1% 25 - 0.8 1.2 - 0.8 1.2 µs To 0.01% 25 - 1.0 1.5 - 1.0 1.5 µs Aperture Time (Note 8) 25 - 25 - - 25 - ns Effective Aperture Delay Time 25 -50 -25 0 -50 -25 0 ns Aperture Uncertainty 25 - 0.3 - - 0.3 - ns Droop Rate 25 - 0.08 0.5 - 0.08 0.5 µV/µs Full - 17 100 - 1.2 100 µV/µs 25 - 8 50 - 8 50 pA DIGITAL INPUT CHARACTERISTICS Input Voltage Input Current VIH = +5V SAMPLE AND HOLD CHARACTERISTICS Acquisition Time (Note 7) Drift Current Note 9 Full - 1.7 10 - 0.12 10 nA Charge Transfer Note 9 25 - 0.5 1.1 - 0.5 1.1 pC Hold Step Error Note 9 25 - 5 11 - 5 11 mV Hold Mode Settling Time To 0.01% Full - 165 350 - 165 350 ns Hold Mode Feedthrough 10VP-P , 100kHz Full - 2 - - 2 - mV Positive Supply Current Note 10 25 - 11 13 - 11 13 mA Negative Supply Current Note 10 25 - -11 -13 - -11 -13 mA Supply Voltage Range Note 2 ±13.5 − ±20 ±13.5 - ±20 V Power Supply Rejection V+, Note 11 Full 80 - - 80 - - dB V-, Note 11 Full 65 - - 65 - - dB POWER SUPPLY CHARACTERISTICS NOTES: 4. VO = 20VP-P; RL = 2kΩ; CL = 50pF; unattenuated output. 5. VO = 200mVP-P; RL = 2kΩ; CL = 50pF. 6. VO = 20V Step; RL = 2kΩ; CL = 50pF. 7. VO = 10V Step; RL = 2kΩ; CL = 50pF. 8. Derived from computer simulation only; not tested. 9. VIN = 0V, VIH = +3.5V, tR < 20ns (VIL to VIH). 10. Specified for a zero differential input voltage between +IN and -IN. Supply current will increase with differential input (as may occur in the Hold mode) to approximately ±46mA at 20V. 11. Based on a 1V delta in each supply, i.e. 15V ±0.5VDC. 12. RL = 1kΩ, CL = 30pF. 3 HA-5320 Test Circuits and Waveforms 1 2 S/H CONTROL INPUT 14 -INPUT OUTPUT 7 8 +INPUT 11 S/H CONTROL VO NC NC HA-5320 (CH = 100pF) FIGURE 1. CHARGE TRANSFER AND DRIFT CURRENT HOLD (+3.5V) SAMPLE (0V) S/H CONTROL HOLD (+3.5V) SAMPLE (0V) S/H CONTROL VO ∆VO VO ∆t VP NOTES: NOTES: 13. Observe the “hold step” voltage VP . 15. Observe the voltage “droop”, ∆VO/∆t. 16. Measure the slope of the output during hold, ∆VO/∆t, and compute drift current: ID = CH ∆VO/∆t. 14. Compute charge transfer: Q = VPCH. FIGURE 2. CHARGE TRANSFER TEST FIGURE 3. DRIFT CURRENT TEST V+ V IN 10VP-P 100kHz SINE WAVE VHA-5320 ANALOG MUX OR SWITCH 9 1 -IN 2 +IN VOUT OUT 14 S/H CONTROL SUPPLY CEXT GND AIN S/H CONTROL INPUT 13 TO SUPPLY COMMON NOTE: 5 11 NC REF COM 6 TO SIGNAL GND 7 INT. COMP. Feedthrough in V OUT dB = 20 log --------------V IN where: VOUT = VP-P, Hold Mode, VIN = VP-P. 8 NC FIGURE 4. HOLD MODE FEEDTHROUGH ATTENUATION Application Information Hold Capacitor The HA-5320 has the uncommitted differential inputs of an op amp, allowing the Sample and Hold function to be combined with many conventional op amp circuits. See the Intersil Application Note AN517 for a collection of circuit ideas. The HA-5320 includes a 100pF MOS hold capacitor, sufficient for most high speed applications (the Electrical Specifications section is based on this internal capacitor). Layout A printed circuit board with ground plane is recommended for best performance. Bypass capacitors (0.01µF to 0.1µF, ceramic) should be provided from each power supply terminal to the Supply Ground terminal on pin 13. The ideal ground connections are pin 6 (SIG. Ground) directly to the system Signal Ground, and pin 13 (Supply Ground) directly to the system Supply Common. 4 Additional capacitance may be added between pins 7 and 11. This external hold capacitance will reduce droop rate at the expense of acquisition time, and provide other trade-offs as shown in the Performance Curves. If an external hold capacitor CEXT is used, then a noise bandwidth capacitor of value 0.1CEXT should be connected from pin 8 to ground. Exact value and type are not critical. The hold capacitor CEXT should have high insulation resistance and low dielectric absorption, to minimize droop errors. Polystyrene dielectric is a good choice for operating temperatures up to 85oC. Teflon® and glass dielectrics offer good performance to 125oC and above. ®Teflon is a registered Trademark of Dupont Corporation. HA-5320 The hold capacitor terminal (pin 11) remains at virtual ground potential. Any PC connection to this terminal should be kept short and “guarded” by the ground plane, since nearby signal lines or power supply voltages will introduce errors due to drift current. Aperture Time Typical Application Hold Step Error Figure 5 shows the HA-5320 connected as a unity gain noninverting amplifier - its most widely used configuration. As an input device for a fast successive - approximation A/D converter, it offers very high throughput rate for a monolithic IC sample/hold amplifier. Also, the HA-5320’s hold step error is adjustable to zero using the Offset Adjust potentiometer, to deliver a 12-bit accurate output from the converter. Hold Step Error is the output error due to Charge Transfer (see above). It may be calculated from the specified parameter, Charge Transfer, using the following relationship: The application may call for an external hold capacitor CEXT as shown. As mentioned earlier, 0.1CEXT is then recommended at pin 8 to reduce output noise in the Hold mode. Effective Aperture Delay Time (EADT) The time required for the sample-and-hold switch to open, independent of delays through the switch driver and input amplifier circuitry. The switch opening time is the interval between the conditions of 10% open and 90% open. Charge Transfer (pC) Hold Step (V) = -----------------------------------------------------------Hold Capacitance (pF) See Performance Curves. The difference between the digital delay time from the Hold command to the opening of the S/H switch, and the propagation time from the analog input to the switch. The HA-5320 output circuit does not include short circuit protection, and consequently its output impedance remains low at high frequencies. Thus, the step changes in load current which occur during an A/D conversion are absorbed at the S/H output with minimum voltage error. A momentary short circuit to ground is permissible, but the output is not designed to tolerate a short of indefinite duration. EADT may be positive, negative or zero. If zero, the S/H amplifier will output a voltage equal to VIN at the instant the Hold command was received. For negative EADT, the output in Hold (exclusive of pedestal and droop errors) will correspond to a value of VIN that occurred before the Hold command. Aperture Uncertainty Glossary of Terms The range of variation in Effective Aperture Delay Time. Aperture Uncertainty (also called Aperture Delay Uncertainty, Aperture Time Jitter, etc.) sets a limit on the accuracy with which a waveform can be reconstructed from sample data. Acquisition Time The time required following a “sample” command, for the output to reach its final value within ±0.1% or ±0.01%. This is the minimum sample time required to obtain a given accuracy, and includes switch delay time, slewing time and settling time. Drift Current The net leakage current from the hold capacitor during the hold mode. Drift current can be calculated from the droop rate using the formula: Charge Transfer The small charge transferred to the holding capacitor from the inter-electrode capacitance of the switch when the unit is switched to the HOLD mode. Charge transfer is directly proportional to sample-to-hold offset pedestal error, where: Charge Transfer (pC) = CH (pF) x Hold Step Error (V) OFFSET ADJUST ±15mV 10kΩ -15V +15V HI-574A 3 4 5 9 11 CEXT 1 100pF + VIN - 2 13 7 INPUT - DIGITAL OUTPUT + 14 S/H CONTROL CONVERT HA-5320 H S ∆V I D (pA) = C H ( pF ) × -------- (V/s) ∆t 6 13 5 8 R/C 0.1CEXT SYSTEM POWER GROUND SYSTEM SIGNAL GROUND 9 ANALOG COMMON NOTE: Pin Numbers Refer to DIP Package Only. FIGURE 5. TYPICAL HA-5320 CONNECTIONS; NONINVERTING UNITY GAIN MODE 5 HA-5320 Typical Performance Curves CH = 100pF, INTERNAL 10 ACQUISITION TIME FOR 10V STEP TO +0.01% (µs) 5 1000 IDRIFT (pA) VOLTAGE DROOP DURING HOLD MODE, (mV/100ms) 1.0 0.5 0.1 SAMPLE-TO-HOLD OFFSET (HOLD STEP) ERROR, (mV) 0.05 0.01 100 100 10 1 1000 10K 0 100K -25 0 CH VALUE (pF) FIGURE 6. TYPICAL SAMPLE AND HOLD PERFORMANCE AS A FUNCTION OF HOLD CAPACITOR 25 50 75 TEMPERATURE (oC) 100 FIGURE 7. DRIFT CURRENT vs TEMPERATURE 100 0 80 45 PHASE 90 60 (CH = 100pF) GAIN GAIN (CH = 1100pF) 40 135 180 20 0 PHASE (DEGREES) GAIN (dB) 120 0 10 100 1K 10K 100K 1M 10M FREQUENCY (Hz) FIGURE 8. OPEN LOOP GAIN AND PHASE RESPONSE CH = 100pF TA = 25oC -10 -8 -6 -4 5.0 CH = 100pF 0.5 CH = 1000pF 0.05 CH = 0.01µF -2 2 4 6 75oC HOLD STEP VOLTAGE HOLD STEP VOLTAGE (mV) 8 DC INPUT (V) FIGURE 9A. HOLD STEP vs INPUT VOLTAGE 10 25oC 2 3 4 LOGIC LEVEL HIGH (V) FIGURE 9B. HOLD STEP vs LOGIC (VIH) VOLTAGE FIGURE 9. TYPICAL SAMPLE-TO-HOLD OFFSET (HOLD STEP) ERROR 6 5 125 HA-5320 Die Characteristics DIE DIMENSIONS: PASSIVATION: Type: Nitride (Si3N4) over Silox (SiO2, 5% Phos) Silox Thickness: 12kÅ ±2kÅ Nitride Thickness: 3.5kÅ ±1.5kÅ 92 mils x 152 mils x 19 mils METALLIZATION: Type: Al, 1% Cu Thickness: 16kÅ ±2kÅ TRANSISTOR COUNT: 184 SUBSTRATE POTENTIAL: V- Metallization Mask Layout HA-5320 CEXT (11) SUPPLY GND (13) V+ (9) S/H CTRL (14) -INPUT (1) (8) INT BW (7) OUTPUT +INPUT (2) (6) SIG GND (3) (4) (5) VIO ADJ VIO ADJ V- All Intersil semiconductor products are manufactured, assembled and tested under ISO9000 quality systems certification. Intersil semiconductor 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. 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