Texas Instruments INA1620EVM Manual de usuario

SBOU205–March 2018

INA1620EVM Audio Amplifier Evaluation Module

All trademarks are the property of their respective owners.

User's Guide

SBOU205–March 2018

INA1620EVM Audio Amplifier Evaluation Module

This user's guide contains information for the INA1620 device as well as support documentation for the

INA1620 evaluation module (EVM). Included are the performance specifications, set-up procedure,

modifications, measured data, printed circuit board (PCB) layout, schematic, and bill of materials (BOM) of

the INA1620EVM.

Contents

1 Introduction ................................................................................................................... 3

2 Performance Specification Summary ..................................................................................... 3

3 Modifications.................................................................................................................. 3

3.1 Gain................................................................................................................... 4

3.2 Cutoff Frequency.................................................................................................... 5

3.3 Phase Shift .......................................................................................................... 5

3.4 Alternative Uses for Internal Resistors........................................................................... 5

4 Test Setup and Results..................................................................................................... 6

4.1 Power Supply Connections........................................................................................ 6

4.2 Input Connections .................................................................................................. 8

4.3 Output Connections ................................................................................................ 8

4.4 Enable ............................................................................................................... 8

4.5 THD+N vs. Frequency ............................................................................................. 8

4.6 THD+N vs. Amplitude .............................................................................................. 9

4.7 Fast Fourier Transforms.......................................................................................... 10

4.8 CMRR vs. Frequency............................................................................................. 12

5 Board Layout................................................................................................................ 13

5.1 Layout............................................................................................................... 13

6 Schematic, Bill of Materials, and Reference............................................................................ 16

6.1 Schematic .......................................................................................................... 16

6.2 Bill of Materials .................................................................................................... 18

6.3 Reference .......................................................................................................... 18

List of Figures

1 INA1620EVM Schematic Using Internal Resistors...................................................................... 3

2 INA1620EVM Schematic Using External Resistors..................................................................... 4

www.ti.com

2SBOU205–March 2018

Submit Documentation Feedback

INA1620EVM Audio Amplifier Evaluation Module

3 Power Supply Connections................................................................................................. 7

4 THD+N vs Frequency for a 32-ΩLoad ................................................................................... 8

5 THD+N vs Frequency for a 16-ΩLoad ................................................................................... 9

6 THD+N vs Amplitude for a 32-ΩLoad.................................................................................... 9

7 THD+N vs Amplitude for a 16-ΩLoad .................................................................................. 10

8 FFT of Left Channel With a 32-ΩLoad ................................................................................. 10

9 FFT of Right Channel With a 32-ΩLoad................................................................................ 11

10 FFT of Left Channel With a 16-ΩLoad ................................................................................. 11

11 FFT of Right Channel With a 16-ΩLoad................................................................................ 12

12 CMRR vs Frequency With No Load ..................................................................................... 12

13 Top Layer PCB Layout .................................................................................................... 14

14 Bottom Layer PCB Layout ................................................................................................ 15

15 INA1620EVM Schematic.................................................................................................. 17

List of Tables

1 INA1620EVM Measured Performance Summary ....................................................................... 3

2 Jumper and Resistor Substitutions for Internal Resistor Reuse....................................................... 5

3 INA1620EVM Bill of Materials ............................................................................................ 18

R2A (R3A) R2C (R3C)

R1A (R4A)

R1C

(R4C)

C1 (C4)

(C3)

IN±

IN+

Right Channel Input

(Left Channel Input) Right Channel Output

(Left Channel Output)

www.ti.com

Introduction

SBOU205–March 2018

INA1620EVM Audio Amplifier Evaluation Module

1 Introduction

The INA1620 is a high-performance, bipolar-input audio operational amplifier with integrated thin-film

resistors. For a full list of electrical characteristics of the INA1620, see the INA1620 product data sheet.

2 Performance Specification Summary

A summary of the INA1620EVM performance specifications is provided in Table 1. Specifications are

given for a supply voltage of Vs= ±15 V and at an ambient temperature of 25°C, unless otherwise noted.

Table 1. INA1620EVM Measured Performance Summary

SPECIFICATION TEST CONDITIONS MEASURED

PERFORMANCE

Total Harmonic Distortion Plus Noise

(THD+N) at 1 kHz VIN = 1 VRMS, Load = 32 Ω, measurement bandwidth =

90 kHz –107.8 dB

THD+N vs at 1 kHz VIN = 1 VRMS, Load = 16 Ω, measurement bandwidth =

90 kHz –107.1 dB

Second Harmonic – Left Channel VIN = 1 VRMS, Load = 32 Ω, Fin = 1 kHz –129.62 dBV

Second Harmonic – Right Channel VIN = 1 VRMS, Load = 32 Ω, Fin = 1 kHz –125.53 dBV

Second Harmonic – Left Channel VIN = 1 VRMS, Load = 16 Ω, Fin = 1 kHz –122.91 dBV

Second Harmonic – Right Channel VIN = 1 VRMS, Load = 16 Ω, Fin = 1 kHz –121.36 dBV

CMRR - Left VIN = 1 VRMS, FIN = 1 kHz, no load –83 dB

CMRR - Right VIN = 1 VRMS, FIN = 1 kHz, no load –84 dB

3 Modifications

This EVM is designed to provide access to the features of and measure the performance of the INA1620.

The phase shift and cutoff frequency of this EVM can be modified by changing external capacitors. The

INA1620EVM allows external resistors to be used instead of the internal thin-film resistors INA1620. This

may be useful for applications where the excellent matching of the INA162 resistors is desired for another

use. The schematic of the INA1620EVM configured to use internal resistors is displayed in Figure 1. For a

full schematic of the INA1620EVM, see Figure 15.

Figure 1. INA1620EVM Schematic Using Internal Resistors

 

RightChan tLeftChannelO p nelOutpu 1

ut ut

VRIN IN

V 

§ ·

¸

15 20 20

LeftChannelOutput 13 15 19 19

R R R

1 IV N IN

R R R R

 

§ · § ·



¨ ¨¸ ¨ ¸

§ ·



¹ ¹

u u

©

7 2

RightChannelOutput 6 7

1 1

VR R

1 IN IN

R R R R

 

§ · § ·



¨ ¸ §¨ ¸

u  u u

¨¹ ¹

©

R1 (R19) R2 (R20)

R7 (R13)

(R15)

C1 (C4)

(C3)

IN±

IN+

Right Channel Input

(Left Channel Input) Right Channel Output

(Left Channel Output)

RightChannelOutpLeftChan tnelOut u up t

V V IN IN

 



3C 3C

LeftChannelO C

utput 34A 3A

R R R

1 IV N IN

R R R R

 

§ · § ·



¨ ¨¸ ¨ ¸

§ ·



¹ ¹

u u

©

2C 2C

RightChannelOutput 2A

1C 1A 2A

R R R

1 IN IN

R R R

 

§ · § ·



¨¨

¸¨ ¸



§ · u u

© ¹

Modifications

www.ti.com

4SBOU205–March 2018

Submit Documentation Feedback

INA1620EVM Audio Amplifier Evaluation Module

3.1 Gain

Equation 1 and Equation 2 display the transfer function of the circuit shown in Figure 1.

(1)

(2)

When using the internal thin-film resistors, all resistance values in Equation 1 and Equation 2 are 1 kΩ.

This simplifies Equation 1 and Equation 2 into Equation 3.

(3)

The INA1620EVM also allows the use of external resistors to set the amplifier gain. Note that external

resistors must be used if the thin-film resistors in the INA1620 are to be used for other purposes.

Equation 4 and Equation 5 display the transfer function for the circuit shown in Figure 2.

Figure 2. INA1620EVM Schematic Using External Resistors

(4)

(5)

For best CMRR performance, it is desirable to balance the gain from the IN+ and IN– components by

setting R1 = R7, R13 = R19, R2 = R6, and R20 = R5. For a typical headphone amplifier application, both

the left and right channels will be identical, so R1 = R7 = R13 = R19 and R2 = R6 = R15 = R20. In this

case, Equation 4 and Equation 5 simplify to Equation 6.

(6)

tan§ ·

¨ ¸

 ¹

e15 3

c l ft 1

2 R C

S u u

c right 2 1

2 R C



g S u u

www.ti.com

Modifications

SBOU205–March 2018

INA1620EVM Audio Amplifier Evaluation Module

3.2 Cutoff Frequency

This EVM provides the ability to filter the output of the INA1620. The cutoff frequency of the filter can be

calculated using Equation 7 and Equation 8.

given

• R1= R7, R2= R6, and C1= C2(7)

given

• R13 = R19, R15 = R20, and C3= C4(8)

If the internal resistors of the INA1620 are used instead, both R2and R15 above are 1-kΩresistors.

3.3 Phase Shift

The phase shift, Θ, is calculated using Equation 9.

where

• ƒ is the maximum frequency of interest within the audio band

• ƒcis the cutoff frequency discussed in Section 3.2 (9)

3.4 Alternative Uses for Internal Resistors

For most headphone amplifier applications, the internal thin-film resistors in the INA1620 are used as

shown in Figure 1. However, these resistors may be used for other purposes, if desired. The

INA1620EVM supports disconnecting each of the four matched resistor pairs for external use, as

described below.

Table 2. Jumper and Resistor Substitutions for Internal Resistor Reuse

INA1620 INTERNAL RESISTOR PAIR 0-ΩRESISTORS TO REMOVE 1-kΩRESISTORS TO INSTALL

R1 (terminals R1A, R1B, R1C) R8, R9, R10 R6, R7

R2 (terminals R2A, R2B, R2C) R3, R4, R5 R1, R2

R3 (terminals R3A, R3B, R3C) R16, R17, R18 R19, R20

R4 (terminals R4A, R4B, R4C) R11, R12, R14 R13, R15

Table 2 shows the 0-Ωresistors that must be removed and 1-kΩresistors that must be added in order to

use each internal resistor pair in the INA1620 separately. When the appropriate changes have been

made, the internal resistor pairs may be accessed on the corresponding connections on the EVM labelled

U1R1 A, B, and C, U1R2 A, B, and C, etc, as shown in Figure 13.

Test Setup and Results

www.ti.com

6SBOU205–March 2018

Submit Documentation Feedback

INA1620EVM Audio Amplifier Evaluation Module

4 Test Setup and Results

This section describes how to properly connect, set up, and use the INA1620EVM. This section also

includes measured data of the INA1620EVM to display typical performance of the INA1620EVM.

Measurements include:

•THD+N vs Frequency for a 32- and 16-Ωload

•THD+N vs Amplitude for a 32- and 16-Ωload

•Fast-Fourier Transform (FFT) for a 32- and 16-Ωload

• CMRR vs. Frequency with no output load

The THD+N vs Frequency,THD+N vs Amplitude,FFT, and CMRR vs Frequency measurements were

taken using an Audio Precision APx555. All measurements were taken using ±15-V supplies at an

ambient temperature of 25 °C, unless otherwise noted.

4.1 Power Supply Connections

Power-supply connections to the INA1620EVM are made through screw terminal connector J5 at the top

of the EVM. The positive power supply connection is marked Vcc, the negative supply connection Vee, and

the ground connection GND. To connect power to the EVM, insert wires into each terminal, then tighten

the screws to make the connection. Figure 3 shows the proper way to connect power to the INA1620EVM.

For minimum and maximum supply voltages of the INA1620EVM, see the INA1620 product data sheet.

www.ti.com

Test Setup and Results

SBOU205–March 2018

INA1620EVM Audio Amplifier Evaluation Module

Figure 3. Power Supply Connections

THD+N Ratio (dB)

Frequency (Hz)

-110

-105

-100

-95

-90

-85

-80

100 1k 10k

Left Channel

Right Channel

Test Setup and Results

www.ti.com

8SBOU205–March 2018

Submit Documentation Feedback

INA1620EVM Audio Amplifier Evaluation Module

4.2 Input Connections

Signals for the left channel and right channel inputs are applied through connectors J3 and J1,

respectively. Connect wires to J1 and J3 to provide an input signal from an audio source such as an audio

analyzer or audio digital-to-analog converter (DAC). The positive input connects to the pin labeled +, the

negative input to the pin labeled –, and the ground connection connects to the center pin, marked GND.

4.3 Output Connections

Output connections are provided through the use of the audio jack, J2, and two test points labelled Left

Out and Right Out. The audio jack provides a way to connect headphones or a resistive load to the output

of the INA1620. The test points provide a connection to measure the performance of the two channels

with an audio analyzer, distortion analyzer, or other test equipment.

4.4 Enable

Jumper J4 provides access to the EN pin on the INA1620. Placing a shunt across J4 disables the

INA1620 by grounding the EN pin. When the EN pin is grounded, a current flows through R3 to ground

that is larger than the shutdown current of the OPA1622. Removing the shunt across J5 enables the

INA1620 by pulling the EN pin up to the positive supply through resistor R3. Voltages up to the positive

supply can be applied to the EN pin. External sources can be applied to the enable pin by removing the

shunt and resistor R3 and connecting an external source to J4.

4.5 THD+N vs. Frequency

For all THD+N vs Frequency measurements, the input signal frequency was swept from 20 Hz to 20 kHz

and had an amplitude of 1 VRMS on the output of the INA1620 with the measurement bandwidth of the

Audio Precision set to 90 kHz. A small variation in the THD+N performance between amplifier channels is

normal. Figure 4 shows the THD+N vs Frequency for a 32-Ωload.

Figure 4. THD+N vs Frequency for a 32-ΩLoad

Input Level (Vrms)

THD+N Ratio (dB)

0.01 0.1 1 3

-120

-100

-80

-60

-40

-20

0Left Channel

Right Channel

Frequency (Hz)

THD+N Ratio (dB)

-110

-105

-100

-95

-90

-85

-80

100 1k 10k

Left Channel

Right Channel

www.ti.com

Test Setup and Results

SBOU205–March 2018

INA1620EVM Audio Amplifier Evaluation Module

Figure 5 shows the THD+N vs Frequency for a 16-Ωload.

Figure 5. THD+N vs Frequency for a 16-ΩLoad

4.6 THD+N vs. Amplitude

For all THD+N vs Amplitude measurements, the output amplitude was swept from 10 mVRMS to 3 VRMS at a

frequency of 1 kHz. The measurement bandwidth of the Audio Precision was set to 22 kHz. Note that

driving low impedance loads from power supply voltages larger than ±5 V may cause the output of the

INA1620 to clip at a lower output amplitude than what is shown in the measurements because the

increased power dissipation in the amplifier will trigger the thermal protection circuitry. See the INA1620

product datasheet Application and Implementation section for information on calculating power dissipation.

Figure 6 shows the THD+N vs Amplitude for a 32-Ωload.

Figure 6. THD+N vs Amplitude for a 32-ΩLoad

Frequency (Hz)

Amplitude (dBV)

0 2000 4000 6000 8000 10000 12000 14000 16000 18000 20000

-160

-140

-120

-100

-80

-60

-40

-20

0Left Channel

Input Level (Vrms)

THD+N Ratio (dB)

0.01 0.1 1 3

-120

-100

-80

-60

-40

-20

0Left Channel

Right Channel

Test Setup and Results

www.ti.com

10 SBOU205–March 2018

Submit Documentation Feedback

INA1620EVM Audio Amplifier Evaluation Module

Figure 7 shows the THD+N vs Amplitude for a 16-Ωload.

Figure 7. THD+N vs Amplitude for a 16-ΩLoad

4.7 Fast Fourier Transforms

For all FFT measurements, a frequency of 1 kHz and amplitude of 1 VRMS on the output was used. The 1-

VRMS fundamental corresponds to 0 dBV in all FFT measurements. Figure 8 shows an FFT of the left

channel with a 32-Ωload. The second harmonic was measured to be –125.45 dBV.

Figure 8. FFT of Left Channel With a 32-ΩLoad

Tabla de contenidos

Otros manuales de Placa madre de Texas Instruments

Texas Instruments

Texas Instruments LP8860-Q1EVM Manual de usuario

Texas Instruments

Texas Instruments CSD87588NEVM-603 Manual de usuario

Texas Instruments

Texas Instruments LMQ61460EVM-400K Manual de usuario

Texas Instruments

Texas Instruments LM5158EVM-BST Manual de usuario

Texas Instruments

Texas Instruments ADS1263EVM-PDK Manual de usuario

Texas Instruments

Texas Instruments LM63625QDRREVM Manual de usuario

Texas Instruments

Texas Instruments ADS54J54EVM Manual de usuario

Texas Instruments

Texas Instruments TLV320AIC13EVM Manual de usuario

Texas Instruments

Texas Instruments bq76PL455EVM Manual de usuario

Texas Instruments

Texas Instruments TPS65261EVM-650 Manual de usuario

Texas Instruments

Texas Instruments DAC5668 Manual de usuario

Texas Instruments

Texas Instruments DS90UB95x-Q1EVM Series Manual de usuario

Texas Instruments

Texas Instruments TPS23861EVM-612 Manual de usuario

Texas Instruments

Texas Instruments Chipcon CC2430DB Manual de usuario

Texas Instruments

Texas Instruments BQ24450EVM Manual de usuario

Texas Instruments

Texas Instruments SmartRF06 Manual de usuario

Texas Instruments

Texas Instruments DAC8728EVM Manual de usuario

Texas Instruments

Texas Instruments TRF3722EVM Manual de usuario

Texas Instruments

Texas Instruments ADS8910BEVM-PDK Manual de usuario

Texas Instruments

Texas Instruments ADC08060 Manual de usuario

Texas Instruments

Texas Instruments TPL0401EVM Manual de usuario

Texas Instruments

Texas Instruments ADS131E08EVM-PDK Manual de usuario

Texas Instruments

Texas Instruments INA226EVM Manual de usuario

Texas Instruments

Texas Instruments DRV425 Manual de usuario

Manuales populares de Placa madre de otras marcas

DFI

DFI SD170 Manual de usuario

ASROCK

ASROCK ROMED8-2T Manual de usuario

Asus

Asus P2L97A Manual de usuario

Winmate

Winmate IC70 Manual de usuario

Asus

Asus MES-B Manual de usuario

Grantech

Grantech SYS8F377VGGA-3OMN Manual de usuario

Telit Wireless Solutions

Telit Wireless Solutions SL869-3DR Manual de usuario

Gigabyte

Gigabyte GA-9IVDT Manual de usuario

Commell

Commell MS-C73 Manual de usuario

IBT Technologies

IBT Technologies MB860 Manual de usuario

Nvidia

Nvidia TEGRA DG-04927-001_V01 Manual de usuario

Biostar

Biostar M7VIT Bravo Instrucciones de funcionamiento e instalación

Intel

Intel D33217CK Manual de usuario

Asus

Asus F1A55-M LX PLUS R2.0 Manual de usuario

EPC

EPC EPC9147C Manual de usuario

Asus

Asus EX-B760M-V5 D4 Manual de usuario

EPOX

EPOX MU-8KHA0010 Manual de usuario

Ski-Doo

Ski-Doo Bombardier MPEM 219 700 090 Manual de usuario