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INA103

Low Noise, Low Distortion

INSTRUMENTATION AMPLIFIER

FEATURES

● LOW NOISE: 1nV/√Hz

● LOW THD+N: 0.0009% at 1kHz, G = 100

● HIGH GBW: 100MHz at G = 1000

● WIDE SUPPLY RANGE:

±9V to ±25V

● HIGH CMRR: >100dB

● BUILT-IN GAIN SETTING RESISTORS:

G = 1, 100

● UPGRADES AD625

APPLICATIONS

● HIGH QUALITY MICROPHONE PREAMPS

(REPLACES TRANSFORMERS)

● MOVING-COIL PREAMPLIFIERS

● DIFFERENTIAL RECEIVERS

● AMPLIFICATION OF SIGNALS FROM:

Strain Gages (Weigh Scale Applications)

Thermocouples

Bridge Transducers

DESCRIPTION

The INA103 is a very low noise, low distortion mono-

lithic instrumentation amplifier. Its current-feedback

circuitry achieves very wide bandwidth and excellent

dynamic response. It is ideal for low-level audio

signals such as balanced low-impedance microphones.

The INA103 provides near-theoretical limit noise per-

formance for 200Ω source impedances. Many indus-

trial applications also benefit from its low noise and

wide bandwidth.

Unique distortion cancellation circuitry reduces dis-

tortion to extremely low levels, even in high gain. Its

balanced input, low noise and low distortion provide

superior performance compared to transformer-coupled

microphone amplifiers used in professional audio

equipment.

The INA103’s wide supply voltage (±9 to ±25V) and

high output current drive allow its use in high-level

audio stages as well. A copper lead frame in the plastic

DIP assures excellent thermal performance.

The INA103 is available in 16-pin plastic DIP and

SOL-16 surface-mount packages. Commercial and In-

dustrial temperature range models are available.

–Input

+Input

+Gain Sense

3kΩ

60.6Ω

G = 100

–R

–Gain Drive

+Gain Drive

Ref

Sense

Output

Ω

–

V–

V+

3 4

Offset

Null

Offset

Null

–Gain Sense

Ω

INA103

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

INA103

1990 Burr-Brown Corporation PDS-1016H Printed in U.S.A. March, 1998

SBOS003

Summary of content (17 pages)

PAGE 1
® INA103 INA 103 INA 103 Low Noise, Low Distortion INSTRUMENTATION AMPLIFIER FEATURES APPLICATIONS ● LOW NOISE: 1nV/√Hz ● LOW THD+N: 0.
PAGE 2
SPECIFICATIONS All specifications at TA = +25°C, VS = ±15V and RL = 2kΩ, unless otherwise noted. INA103KP, KU PARAMETER CONDITIONS GAIN Range of Gain Gain Equation (1) Gain Error, DC G = 1 G = 100 Equation Gain Temp. Co.
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SPECIFICATIONS (CONT) All specifications at TA = +25°C, VS = ±15V and RL = 2kΩ, unless otherwise noted.
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TYPICAL PERFORMANCE CURVES At TA = +25°C, VS = ±15V, unless otherwise noted. OUTPUT SWING vs SUPPLY ±25 ±20 ±20 Output Voltage (V) Input Voltage Range (V) INPUT VOLTAGE RANGE vs SUPPLY ±25 ±15 ±10 ±15 ±10 ±5 ±5 ±5 ±10 ±15 ±20 ±25 ±5 ±10 Power Supply Voltage (V) MAX COMMON-MODE VOLTAGE vs OUTPUT VOLTAGE ±20 ±25 OUTPUT SWING vs LOAD RESISTANCE 22 ±16 16.5 V S = ±25V Output Voltage (V) Common-Mode Voltage (V) ±15 Power Supply Voltage (V) 11 V S = ±15V 5.5 ±12 ±8 ±4 ±0 0 5.
PAGE 5
TYPICAL PERFORMANCE CURVES (CONT) At TA = +25°C, VS = ±15V, unless otherwise noted. SMALL SIGNAL TRANSIENT RESPONSE (G = 1) INPUT BIAS CURRENT vs TEMPERATURE Output Voltage (V) 5 4 3 2 1 –55 0 50 100 Time (µs) 125 Temperature (°C) LARGE SIGNAL TRANSIENT RESPONSE (G = 1) Output Voltage (V) SMALL SIGNAL TRANSIENT RESPONSE (G = 100) Output Voltage (V) Time (µs) Time (µs) SETTLING TIME vs GAIN (0.
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TYPICAL PERFORMANCE CURVES (CONT) At TA = +25°C, VS = ±15V, unless otherwise noted. SETTLING TIME vs GAIN (0.
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TYPICAL PERFORMANCE CURVES (CONT) At TA = +25°C, VS = ±15V, unless otherwise noted. V– POWER SUPPLY REJECTION vs FREQUENCY THD + N vs LEVEL 1 G = 100, 1000 f = 1kHz 120 G = 10 100 0.1 G=1 THD + N (%) Power Supply Rejection (dB) 140 80 60 0.010 40 G=1 20 0.001 0 0.0005 1 10 100 1k 10k 100k 1M –60 –45 –30 Frequency (Hz) 15 5 G=1 V OUT = 20Vp-p f = 1kHz 1 0.01 CCIF IMD (%) THD + N (%) 0 CCIF IMD vs AMPLITUDE THD + N vs LOAD 0.1 0.001 G = 1000 0.1 G = 100 0.
PAGE 8
TYPICAL PERFORMANCE CURVES (CONT) At TA = +25°C, VS = ±15V unless, otherwise noted. CURRENT NOISE SPECTRAL DENSITY SMPTE IMD vs FREQUENCY 100 Current Noise Density (pA/ Hz) 5 SMPTE IMD (%) 1 0.1 G = 1000 0.010 G = 100 G=1 G = 10 0.001 0.0005 10 1 2k 10k 1 20k 10 100 1k 10k Frequency (Hz) Frequency (Hz) APPLICATIONS INFORMATION useful if various input sources are connected to the INA103.
PAGE 9
V+ 1µF Tantalum + 50Ω 9 16 16 1.2µH 15 – V IN RG + 13 11 INA103 14 VO = G • VIN 10 11 INA103 7 6 7 RL VOUT 2 1.2µH 1 8 1 + V– NOTES: (1) No RG required for G = 1. See gain-set connections in Figure 4. (2) RG for G = 100 is internal. See gain-set connection in Figure 5. GAIN GAIN (dB) RG (Ω) 1 3.16 10 31.6 100 316 1000 0 10 20 30 40 50 60 Note 1 2774 667 196 60.6(2) 19 6 50Ω FIGURE 2. Input Stabilization Network.
PAGE 10
OUTPUT SENSE An output sense terminal allows greater gain accuracy in driving the load. By connecting the sense connection at the load, I•R voltage loss to the load is included inside the feedback loop. Current drive can be increased by connecting a current booster inside the feedback loop as shown in Figure 11. Figure 6 shows an active control loop that adjusts the output offset voltage to zero. A2, R, and C form an integrator that produces an offsetting voltage applied to one input of the INA103.
PAGE 11
RF 16 R1 15 16 13 11 INA103 ∆ VIN 14 R2 15 10 VOUT 7 6 ∆V IN RG 11 10 INA103 14 7 R3 2 12 13 VOUT 6 5 1 2 G = 1+ 1 Output Stage Gain = OUTPUT STAGE GAIN R1 and R3 (kΩ) R2 (Ω) 2 5 10 1k 1.2k 1.2k 2.4k 632Ω 273Ω (R2 || 12k) + R1 + R3 (R2 || 12k) 2RF RG RF RF > 10kΩ can increase noise and reduce bandwidth—see text. NOTE: AD625 equivalent pinout. FIGURE 7. Gain Adjustment of Output Stage. FIGURE 8. Use of External Resistors for Gain Set.
PAGE 12
47µF/63V 16 + 6.8kΩ +48V 15 2.2kΩ 20dB Pad 1 Phantom Power 240Ω cm 3 2 6.8kΩ 10Ω Gain Adjust 47kΩ 13 1kΩ 11 10 INA103 14 V OUT 7 6 100kΩ 1µF 2 47µF/63V 1 + – 2.2kΩ 20dB Pad OPA627 + 240Ω Output offset voltage control loop. FIGURE 12. Microphone Preamplifier with Provision for Phantom Power Microphones. 16 15 10kΩ 12 13 INA103 14 ∆V IN 10kΩ 11 10 VOUT 7 6 10kΩ 10kΩ 5 2 1 – 100Ω + Shield driver minimizes degradation of CMR due to distributed capacitance on the input lines.
PAGE 13
PACKAGE OPTION ADDENDUM www.ti.
PAGE 14
PACKAGE OPTION ADDENDUM www.ti.com 24-Jan-2013 continues to take reasonable steps to provide representative and accurate information but may not have conducted destructive testing or chemical analysis on incoming materials and chemicals. TI and TI suppliers consider certain information to be proprietary, and thus CAS numbers and other limited information may not be available for release.
PAGE 15
PACKAGE MATERIALS INFORMATION www.ti.com 26-Jan-2013 TAPE AND REEL INFORMATION *All dimensions are nominal Device INA103KU/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 16
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) INA103KU/1K SOIC DW 16 1000 367.0 367.0 38.
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