Datasheet

ManualsBrandsTEXAS INSTRUMENTS ManualsLinear ICsLinear IC - In-amp, Op-amp InAmp PDIP 8

INA111

1992 Burr-Brown Corporation PDS-1143E Printed in U.S.A. March, 1998

INA111

(12)

(11)

(10)

10kΩ10kΩ

25kΩ

10kΩ10kΩ

(13)7

(7)4

(5)

(15)

(2)

(4)

V+

V–

INA111

DIP

(SOIC)

Ref

Feedback

G = 1 +

50kΩ

–

DIP Connected

Internally

High Speed FET-Input

INSTRUMENTATION AMPLIFIER

FEATURES

● FET INPUT: I

= 20pA max

● HIGH SPEED: T

= 4µs (G = 100, 0.01%)

● LOW OFFSET VOLTAGE: 500

µV max

● LOW OFFSET VOLTAGE DRIFT:

µV/°C max

● HIGH COMMON-MODE REJECTION:

106dB min

● 8-PIN PLASTIC DIP, SOL-16 SOIC

APPLICATIONS

● MEDICAL INSTRUMENTATION

● DATA ACQUISITION

DESCRIPTION

The INA111 is a high speed, FET-input instrumenta-

tion amplifier offering excellent performance.

The INA111 uses a current-feedback topology provid-

ing extended bandwidth (2MHz at G = 10) and fast

settling time (4µs to 0.01% at G = 100). A single

external resistor sets any gain from 1 to over 1000.

Offset voltage and drift are laser trimmed for excellent

DC accuracy. The INA111’s FET inputs reduce input

bias current to under 20pA, simplifying input filtering

and limiting circuitry.

The INA111 is available in 8-pin plastic DIP, and

SOL-16 surface-mount packages, specified for the

–40°C to +85°C temperature range.

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/ • FAXLine: (800) 548-6133 (US/Canada Only) • Cable: BBRCORP • Telex: 066-6491 • FAX: (520) 889-1510 • Immediate Product Info: (800) 548-6132

INA111

SBOS015

Summary of content (16 pages)

PAGE 1
INA1 ® INA111 11 INA1 11 High Speed FET-Input INSTRUMENTATION AMPLIFIER FEATURES DESCRIPTION ● FET INPUT: IB = 20pA max The INA111 is a high speed, FET-input instrumentation amplifier offering excellent performance. ● LOW OFFSET VOLTAGE: 500µV max ● LOW OFFSET VOLTAGE DRIFT: 5µV/°C max The INA111 uses a current-feedback topology providing extended bandwidth (2MHz at G = 10) and fast settling time (4µs to 0.01% at G = 100). A single external resistor sets any gain from 1 to over 1000.
PAGE 2
SPECIFICATIONS ELECTRICAL At TA = +25°C, VS = ±15V, RL = 2kΩ, unless otherwise noted.
PAGE 3
ELECTROSTATIC DISCHARGE SENSITIVITY PIN CONFIGURATIONS Top View DIP RG 1 8 RG V–IN 2 7 V+ + IN 3 6 VO V– 4 5 Ref V Top View This integrated circuit can be damaged by ESD. Burr-Brown recommends that all integrated circuits be handled with appropriate precautions. Failure to observe proper handling and installation procedures can cause damage. ESD damage can range from subtle performance degradation to complete device failure.
PAGE 4
TYPICAL PERFORMANCE CURVES At TA = +25°C, VS = ±15V, unless otherwise noted. GAIN vs FREQUENCY COMMON-MODE REJECTION vs FREQUENCY 10k 120 Common-Mode Rejection (dB) G = 1k Gain (V/V) 1k G = 100 100 G = 10 10 G=1 1 100 80 G = 1k 60 G = 100 40 G = 10 20 G=1 0 0.
PAGE 5
TYPICAL PERFORMANCE CURVES (CONT) At TA = +25°C, VS = ±15V, unless otherwise noted. INPUT BIAS CURRENT vs TEMPERATURE 50 200 25 100 0 0 G ≥ 10 –100 –25 G=1 –200 –50 10n 0 1 –10m 2 3 4 –75 –25 0 25 50 75 100 Temperature (°C) INPUT BIAS CURRENT vs DIFFERENTIAL INPUT VOLTAGE INPUT BIAS CURRENT vs COMMON-MODE INPUT VOLTAGE 125 –10m –15.7V Input Bias Current (A) –10µ G = 10 G = 100 G = 1k +1p G=1 G = 10 +10p G = 1k –5 0 –100µ –10µ +1p +15.7V +15.
PAGE 6
TYPICAL PERFORMANCE CURVES (CONT) At TA = +25°C, VS = ±15V, unless otherwise noted. TOTAL HARMONIC DISTORTION + NOISE vs FREQUENCY QUIESCENT CURRENT vs TEMPERATURE 1 3.5 3.4 G = 1k 0.1 THD + N (%) Quiescent Current (mA) VO = 3Vrms, RL = 2kΩ Measurement BW = 80kHz 3.3 3.2 Single-Ended Drive G = 1 G = 100 0.01 G = 10 0.001 Differential Drive G = 1 3.1 0.0001 3.
PAGE 7
APPLICATION INFORMATION The 50kΩ term in equation 1 comes from the sum of the two internal feedback resistors. These are on-chip metal film resistors which are laser trimmed to accurate absolute values. The accuracy and temperature coefficient of these resistors are included in the gain accuracy and drift specifications of the INA111. Figure 1 shows the basic connections required for operation of the INA111.
PAGE 8
INPUT BIAS CURRENT RETURN PATH The INA111 exhibits approximately 6dB rise in gain at 2MHz in unity gain. This is a result of its current-feedback topology and is not an indication of instability. Unlike an op amp with poor phase margin, the rise in response is a predictable +6dB/octave due to a response zero. A simple pole at 700kHz or lower will produce a flat passband response (see Input Filtering). The input impedance of the INA111 is extremely high— approximately 1012Ω.
PAGE 9
the 1N4148 may have leakage currents far greater than the input bias current of the INA111 and are usually sensitive to light. A combination of common-mode and differential input voltage can cause the output of A1 or A2 to saturate. Figure 4 shows the output voltage swing of A1 and A2 expressed in terms of a common-mode and differential input voltages.
PAGE 10
mismatched values, causes a high frequency common-mode signal to be converted to a differential signal. This degrades common-mode rejection. The differential input capacitor, C3, reduces the bandwidth and mitigates the effects of mismatch in C1 and C2. Make C3 much larger than C1 and C2. If properly matched, C1 and C2 also improve CMR. Surface-mount package version only.
PAGE 11
VIN OPA177 – VIN + RG INA111 Ref C1 50nF VO R1 1MΩ C1 0.1µF R1 10kΩ RG INA111 1 f–3dB = 2πR1C1 OPA602 R2 Ref IL = = 1.59Hz Load Make G ≤ 10 where G = 1 + 50k RG FIGURE 11. AC-Coupled Instrumentation Amplifier. VIN G • R2 FIGURE 12. Voltage Controlled Current Source. – VIN 22.1kΩ 22.1kΩ + VIN 511Ω VO INA111 Ref 100Ω NOTE: Driving the shield minimizes CMR degradation due to unequally distributed capacitance on the input line.
PAGE 12
PACKAGE OPTION ADDENDUM www.ti.
PAGE 13
PACKAGE OPTION ADDENDUM www.ti.com 11-Apr-2013 Pb-Free (RoHS Exempt): This component has a RoHS exemption for either 1) lead-based flip-chip solder bumps used between the die and package, or 2) lead-based die adhesive used between the die and leadframe. The component is otherwise considered Pb-Free (RoHS compatible) as defined above. Green (RoHS & no Sb/Br): TI defines "Green" to mean Pb-Free (RoHS compatible), and free of Bromine (Br) and Antimony (Sb) based flame retardants (Br or Sb do not exceed 0.
PAGE 14
PACKAGE MATERIALS INFORMATION www.ti.com 26-Jan-2013 TAPE AND REEL INFORMATION *All dimensions are nominal Device INA111AU/1K Package Package Pins Type Drawing SOIC DW 16 SPQ Reel Reel A0 Diameter Width (mm) (mm) W1 (mm) 1000 330.0 16.4 Pack Materials-Page 1 10.75 B0 (mm) K0 (mm) P1 (mm) W Pin1 (mm) Quadrant 10.7 2.7 12.0 16.
PAGE 15
PACKAGE MATERIALS INFORMATION www.ti.com 26-Jan-2013 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) INA111AU/1K SOIC DW 16 1000 367.0 367.0 38.
PAGE 16
IMPORTANT NOTICE Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, enhancements, improvements and other changes to its semiconductor products and services per JESD46, latest issue, and to discontinue any product or service per JESD48, latest issue. Buyers should obtain the latest relevant information before placing orders and should verify that such information is current and complete.