Intersil Corporation HFA1112 Datasheet

HFA1112

September 1998 File Number 2992.5

850MHz, Low Distortion Programmable Gain Buffer Ampliﬁer

The HFA1112 is a closed loop Buffer featuring user programmable gain and ultra high speed performance. Manufactured on Intersil’s proprietary complementary bipolar UHF-1 process, the HFA1112 offers a wide -3dB bandwidth of 850MHz, very fast slew rate, excellent gain ﬂatness, low distortion and high output current.

A unique feature of the pinout allows the user to select a voltage gain of +1, -1, or +2, without the use of any external components. Gain selection is accomplished via connections to the inputs, as described in the “Application Information” section. The result is a more ﬂexible product, fewerpart types in inventory, and more efﬁcient use of board space.

Compatibility with existing op amp pinouts provides ﬂexibility to upgrade low gain ampliﬁers, while decreasing component count. Unlike most buffers, the standard pinout provides an upgrade path should a higher closed loop gain be needed at a future date.

This ampliﬁer is available with programmable output limiting as the HFA1113.Forapplications requiring a standard buffer pinout, please refer to the HFA1110 datasheet. For Military product, refer to the HFA1112/883 data sheet.

Pinout

HFA1112

(PDIP, SOIC)

TOP VIEW

300

V+

OUT

-IN

+IN

V-

Features

• User Programmable for Closed-Loop Gains of +1, -1 or +2 without Use of External Resistors

• Wide -3dB Bandwidth. . . . . . . . . . . . . . . . . . . . . .850MHz

• Very Fast Slew Rate. . . . . . . . . . . . . . . . . . . . . . 2400V/µs

• Fast Settling Time (0.1%). . . . . . . . . . . . . . . . . . . . . 11ns

• High Output Current. . . . . . . . . . . . . . . . . . . . . . . . .60mA

• Excellent Gain Accuracy . . . . . . . . . . . . . . . . . . . 0.99V/V

• Overdrive Recovery . . . . . . . . . . . . . . . . . . . . . . . . <10ns

• Standard Operational Ampliﬁer Pinout

Applications

• RF/IF Processors

• Driving Flash A/D Converters

• High-Speed Communications

• Impedance Transformation

• Line Driving

• Video Switching and Routing

• Radar Systems

• Medical Imaging Systems

• Related Literature

- AN9507, Video Cable Drivers Save Board Space

Ordering Information

PART NUMBER

(BRAND)

HFA1112IP -40 to 85 8 Ld PDIP E8.3 HFA1112IB

(H1112I) HFA11XXEVAL High Speed Op Amp DIP Evaluation Board

TEMP.

RANGE (oC) PACKAGE

-40 to 85 8 Ld SOIC M8.15

PKG.

NO.

Pin Description

NAME

NC 1, 5, 8 No Connection

-IN 2 Inverting Input +IN 3 Non-Inverting Input

V- 4 Negative Supply

OUT 6 Output

V+ 7 Positive Supply

NUMBER DESCRIPTION

CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.

HFA1112

Absolute Maximum Ratings Thermal Information

Voltage Between V+ and V-. . . . . . . . . . . . . . . . . . . . . . . . . . . . .12V

Input Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . V

Output Current. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60mA

SUPPLY

Operating Conditions

Temperature Range. . . . . . . . . . . . . . . . . . . . . . . . . . -40oC to 85oC

CAUTION: Stresses above those listed in “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress only rating and operationofthe device at these or any other conditions above those indicated in the operational sections of this speciﬁcation is not implied.

NOTE:

1. θJA is measured with the component mounted on an evaluation PC board in free air.

Thermal Resistance (Typical, Note 1) θJA (oC/W) θJC (oC/W)

PDIP Package . . . . . . . . . . . . . . . . . . . 98 N/A

SOIC Package . . . . . . . . . . . . . . . . . . . 170 N/A

Maximum Junction Temperature (Plastic Package) . . . . . . . .150oC

Maximum Storage Temperature Range. . . . . . . . . . -65oC to 150oC

Maximum Lead Temperature (Soldering 10s) . . . . . . . . . . . . 300oC

(SOIC - Lead Tips Only)

Electrical Speciﬁcations V

PARAMETER TEST CONDITIONS TEMP (oC) MIN TYP MAX UNITS

INPUT CHARACTERISTICS

Output Offset Voltage 25 - 8 25 mV

Output Offset Voltage Drift Full - 10 - µV/oC PSRR 25 39 45 - dB

Input Noise Voltage (Note 3) 100kHz 25 - 9 - nV/√Hz Non-Inverting Input Noise Current (Note 3) 100kHz 25 - 37 - pA/√Hz Non-Inverting Input Bias Current 25 - 25 40 µA

Non-Inverting Input Resistance 25 25 50 - kΩ Inverting Input Resistance (Note 2) 25 240 300 360 Ω Input Capacitance 25 - 2 - pF Input Common Mode Range Full ±2.5 ±2.8 - V

TRANSFER CHARACTERISTICS

Gain AV = +1, VIN = +2V 25 0.980 0.990 1.02 V/V

Gain AV = +2, VIN = +1V 25 1.96 1.98 2.04 V/V

DC Non-Linearity (Note 3) AV = +2, ±2V Full Scale 25 - 0.02 - %

OUTPUT CHARACTERISTICS

Output Voltage (Note 3) AV = -1 25 ±3.0 ±3.3 - V

Output Current (Note 3) RL = 50Ω 25, 85 50 60 - mA

Closed Loop Output Impedance DC, AV = +2 25 - 0.3 - Ω

POWER SUPPLY CHARACTERISTICS

Supply Voltage Range Full ±4.5 - ±5.5 V Supply Current (Note 3) 25 - 21 26 mA

= ±5V, AV = +1, RL = 100Ω, Unless Otherwise Speciﬁed

SUPPLY

Full - - 35 mV

Full 35 - - dB

Full - - 65 µA

Full 0.975 - 1.025 V/V

Full 1.95 - 2.05 V/V

Full ±2.5 ±3.0 - V

-40 35 50 - mA

Full - - 33 mA

HFA1112

Electrical Speciﬁcations V

PARAMETER TEST CONDITIONS TEMP (oC) MIN TYP MAX UNITS

AC CHARACTERISTICS

-3dB Bandwidth (V

= 0.2V

OUT

Slew Rate (V

= 5V

OUT

Full Power Bandwidth (V

= 5V

OUT

Gain Flatness (to 30MHz, Notes 2, 3)

Gain Flatness (to 50MHz, Notes 2, 3)

Gain Flatness (to 100MHz, Notes 2, 3)

Linear Phase Deviation (to 100MHz, Note 3)

2nd Harmonic Distortion (30MHz, V

3rd Harmonic Distortion (30MHz, V

2nd Harmonic Distortion (50MHz, V

3rd Harmonic Distortion (50MHz, V

2nd Harmonic Distortion (100MHz, V

3rd Harmonic Distortion (100MHz, V

P-P

OUT

, Notes 2, 3)

, Note 2)

, Note 3)

= 2V

P-P

= 2V

P-P

= 2V

P-P

= 2V

P-P

= 2V

P-P

= 2V

P-P

, Notes 2, 3)

= ±5V, AV = +1, RL = 100Ω, Unless Otherwise Speciﬁed (Continued)

SUPPLY

AV = -1 25 450 800 - MHz AV = +1 25 500 850 - MHz AV = +2 25 350 550 - MHz AV = -1 25 1500 2400 - V/µs AV = +1 25 800 1500 - V/µs AV = +2 25 1100 1900 - V/µs AV = -1 25 - 300 - MHz AV = +1 25 - 150 - MHz AV = +2 25 - 220 - MHz AV = -1 25 - ±0.02 - dB AV = +1 25 - ±0.1 - dB AV = +2 25 - ±0.015 ±0.04 dB AV = -1 25 - ±0.05 - dB AV = +1 25 - ±0.2 - dB AV = +2 25 - ±0.036 ±0.08 dB AV = -1 25 - ±0.10 - dB AV = +2 25 - ±0.07 ±0.22 dB AV = -1 25 - ±0.13 - Degrees AV = +1 25 - ±0.83 - Degrees AV = +2 25 - ±0.05 - Degrees AV = -1 25 - -52 - dBc AV = +1 25 - -57 - dBc AV = +2 25 - -52 -45 dBc AV = -1 25 - -71 - dBc AV = +1 25 - -73 - dBc AV = +2 25 - -72 -65 dBc AV = -1 25 - -47 - dBc AV = +1 25 - -53 - dBc AV = +2 25 - -47 -40 dBc AV = -1 25 - -63 - dBc AV = +1 25 - -68 - dBc AV = +2 25 - -65 -55 dBc AV = -1 25 - -41 - dBc AV = +1 25 - -50 - dBc AV = +2 25 - -42 -35 dBc AV = -1 25 - -55 - dBc AV = +1 25 - -49 - dBc AV = +2 25 - -62 -45 dBc

HFA1112

Electrical Speciﬁcations V

PARAMETER TEST CONDITIONS TEMP (oC) MIN TYP MAX UNITS

3rd Order Intercept (AV = +2, Note 3)

1dB Compression (AV = +2, Note 3)

Reverse Isolation (S12, Note 3)

TRANSIENT CHARACTERISTICS

Rise Time (V

= 0.5V Step, Note 2)

OUT

Rise Time (V

= 2V Step)

OUT

Overshoot (V

= 0.5V Step, Input tR/tF = 200ps,

OUT

Notes 2, 3, 4)

0.1% Settling Time (Note 3) V

0.05% Settling Time V Overdrive Recovery Time VIN = 5V Differential Gain AV = +1, 3.58MHz, RL = 150Ω 25 - 0.03 - %

Differential Phase AV = +1, 3.58MHz, RL = 150Ω 25 - 0.05 - Degrees

NOTES:

2. This parameter is not tested. The limits are guaranteed based on lab characterization, and reflect lot-to-lot variation.

3. See Typical Performance Curves for more information.

4. Overshoot decreases as input transition times increase, especially for AV = +1. Please refer to Typical Performance Curves.

= ±5V, AV = +1, RL = 100Ω, Unless Otherwise Speciﬁed (Continued)

SUPPLY

100MHz 25 - 28 - dBm 300MHz 25 - 13 - dBm 100MHz 25 - 19 - dBm 300MHz 25 - 12 - dBm 40MHz 25 - -70 - dB 100MHz 25 - -60 - dB 600MHz 25 - -32 - dB

AV = -1 25 - 500 800 ps AV = +1 25 - 480 750 ps AV = +2 25 - 700 1000 ps AV = -1 25 - 0.82 - ns AV = +1 25 - 1.06 - ns AV = +2 25 - 1.00 - ns AV = -1 25 - 12 30 % AV = +1 25 - 45 65 % AV = +2 25 - 6 20 %

= 2V to 0V 25 - 11 - ns

OUT

= 2V to 0V 25 - 15 - ns

OUT

P-P

AV = +2, 3.58MHz, RL = 150Ω 25 - 0.02 - %

AV = +2, 3.58MHz, RL = 150Ω 25 - 0.04 - Degrees

25 - 8.5 - ns

Application Information

Closed Loop Gain Selection

The HFA1112 features a novel design which allows the user to select from three closed loop gains, without any external components. The result is a more ﬂexibleproduct, fewer part types in inventory, and more efﬁcient use of board space.

This “buffer” operates in closed loop gains of -1, +1, or +2, and gain selection is accomplished via connections to the ±inputs. Applying the input signal to +IN and floating -IN selects a gain of +1, while grounding -IN selects a gain of +2. A gain of -1 is obtained by applying the input signal to -IN with +IN grounded.

The table below summarizes these connections:

GAIN (ACL)

-1 GND Input +1 Input NC (Floating) +2 Input GND

+INPUT (PIN 3) -INPUT (PIN 2)

CONNECTIONS

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