THAT CORPORATION THAT1570 Manual de usuario

THAT1570/THAT5171

Digitally-Controlled Microphone Preamplifier

Demo Board

User's Guide

Document 600134 Rev 02

Contents

Features/Specifications....................................................................................... 3

Overview ............................................................................................................ 4

Connections ....................................................................................................... 5

Hardware Set-up ................................................................................................. 5

Software Set-up ................................................................................................... 6

Operation ........................................................................................................... 7

Jumper Options ................................................................................................. 7

Appendix A - Schematic...................................................................................... 9

Appendix B - Bill of Materials............................................................................. 10

Appendix C - PCB Layout .................................................................................. 12

THAT Corporation; 45 Sumner Street; Milford, MA 01757-1656; US

Tel: +1 508 478 9200; Fax: +1 508 478 0990; Web: www.thatcorp.com

Packing List

(1) THAT1570/5171 DEMO Board PCB Assembly

(1) USB Cable

(1) Software CD

If you are missing any of the above items please contact us at

[email protected].

FCC Warning

This device is only intended for laboratory test environments. It may radiate radio

frequency energy and has not been tested for compliance with subpart J of part

15 of the FCC regulations. Operation of this device in other environments may

cause interference with radio communications.

Document 600134 Rev 02 Page 2 of 16 THAT 1570/5171-DEMO User’s Guide

THAT Corporation; 45 Sumner Street; Milford, MA 01757-1656; US

Tel: +1 508 478 9200; Fax: +1 508 478 0990; Web: www.thatcorp.com

Features

• “Combo” XLR/TRS balanced input with switchable 48V phantom power

• Balanced audio output on XLR and TRS connectors

• Supports pro audio signal levels: +21dBu input / output

• Gain (measured input to output) adjustable in 1dB steps: 0dB, and 8-63dB

• USB 1.1 and USB 2.0 compatible control port

• Graphical user interface software for controlling 5171 parameters

• Prototyping area

Description

The THAT Digitally-Controlled Mic Preamp Demo Board allows developers to

evaluate the performance of the THAT1570 / THAT5171 chipset. The demo

board provides a balanced audio input on a Neutrik “combo” connector with 48V

phantom power, and a balanced audio output on XLR and ¼” TRS connectors.

The supplied graphical user interface (GUI) controls all functions in the 5171 chip

via USB. A prototyping area is available for adding or modifying circuitry.

Specifications

23 (V+ supply)

23 (V- supply)

0.5 (+5V supply)

ICC; -IEE, IDD

Supply Current

nV/√Hz

1.65 (60dB gain)

1.9 (40dB gain)

4.8 (20dB gain)

20 (0dB gain)

EIN

Equivalent Input Noise

(1570 output)

nV/√Hz

1.65 (60dB gain)

1.9 (40dB gain)

5.0 (20dB gain)

22.9 (0dB gain)

EIN

Equivalent Input Noise

(main output)

0.0003 (0dB gain)

0.0003 (20dB gain)

0.0008 (40dB gain)

0.006 (60dB gain)

THD

Total Harmonic Distortion

(VOUT = +16dBu (5VRMS); RL= 10kΩ;

CL= 10 pF; f = 1kHz; BW = 22 kHz)

±0.15

Aerr

Gain error (all settings)

8 to 63 in 1dB steps

AdB

Gain (input to output)

dBu+21VOUT

Maximum Differential Output Level

(V+ /V- = ±15V)

dBu+21vin-BAL

Maximum Input Level

(V+ /V- = ±15V)

±15

V+ - V-Power Supply Voltage

UnitsTypicalSymbolParameter

Document 600134 Rev 02 Page 3 of 16 THAT 1570/5171-DEMO User’s Guide

THAT Corporation; 45 Sumner Street; Milford, MA 01757-1656; US

Tel: +1 508 478 9200; Fax: +1 508 478 0990; Web: www.thatcorp.com

THAT1570 / THAT5171 Overview

The THAT1570 and THAT5171 ICs enable digitally-controlled microphone

preamplifier applications with exceptionally high performance. Operating on

maximum +/-17V supplies, the chipset accepts pro audio input levels (+22dBu

max) without an input pad. Gain is adjustable to 5.6dB, and 13.6dB to 68.6dB in

1dB increments (a 5.6dB attenuator at the output offsets the overall gain range to

0dB, and 8-63dB). The 5171’s built-in zero-crossing detector and other patent-

pending techniques for reducing zipper noise enable very smooth and silent gain

changes. A differential servo reduces output offsets to less than 1.5mV. Four

general purpose outputs on the 5171 can be connected to a variety of peripheral

functions, e.g. an input pad, phantom power switch, signal routing switches,

LEDs, etc. The 5171’s addressable SPI interface supports read-back. By separat-

ing the analog mic pre amp front end (THAT1570) from the digital functions and

switched resistor ladder (THAT5171), each IC is optimized for high performance.

The THAT1570 is fabricated using THAT’s complementary dielectric isolation

process and precision laser-trimmed Si-Chrome thin film resistors, yielding

extremely high performance. The THAT5171 is fabricated using a high-voltage

CMOS process, with proprietary techniques for reducing FET switching glitches.

Packaged in 4x4mm QFN16 and 7x7mm QFN32 packages respectively, the

THAT1570 and THAT5171 require very little PCB area.

Block Diagram

Document 600134 Rev 02 Page 4 of 16 THAT 1570/5171-DEMO User’s Guide

THAT Corporation; 45 Sumner Street; Milford, MA 01757-1656; US

Tel: +1 508 478 9200; Fax: +1 508 478 0990; Web: www.thatcorp.com

THAT

1570

Servo

Rg1

Rg2

AGnd

DGnd

IN2

IN1

SCAP2

SCAP1

SOUT1

SOUT2

Resistor

Network

with FET

Switches

Control

Logic

SCLK

DIN

DOUT

GPO1

GPO2

GPO3

GPO0

LEDs

RST

TRC

Vcc

Vee

Vdd

BSY

THAT

5171 --

Phantom

Power

Fault

Protection

RFI

Protection

RFI

Protection

USB

Interface

Ext

SPI

Conn

MUX

USB

SPI Bus

Reset

Switch

REG

+3.3V +5V

Mic/Line

Input

Balanced

Output

+48VCHAS +15 V -15V +5VGND

Power Supply Inputs

INPUT SECTION

Balanced

Output

Driver

OUTPUT

SECTION

Figure 1 -- Block Diagram of the THAT 1570/5171 Demo Board

Connections

Power

The USB interface runs on USB bus power, but the rest of the demo board

requires an external power supply. +/-15 V (maximum +/-17V) supplies the

analog circuitry. +48V phantom power is input (not generated on the board) and

switched on and off via the on-board Phantom Power switch. Note that the ground

return for +48V phantom power is via the CHAS (chassis ground) connector. The

+5V input is regulated on board to 3.3V and supplies the digital logic.

Audio Input

The Neutrik combo connector accepts an XLR or ¼” TRS cable. Maximum input

signal level is +21dBu with +/-15V supplies, or +22dBu with +/-17V supplies.

The 1/4” TRS signal path includes a 20dB pad in order to support very high line

levels.

Audio Output

Separate XLR and ¼” TRS connectors are wired in parallel. Maximum output

signal level is +21dBu with +/-15V supplies, or +22dBu with +/-17V supplies.

The differential attenuator/output buffer (U3) adds a small amount of noise and

distortion to the signal and it is therefore recommended that test points TP1-TP3

be used to measure performance of the 1570/5171 ICs.

USB

A PC must be plugged into the demo board via USB in order to control parame-

ters in the 5171 (e.g. gain). Take care not to hot plug the demo board while the

GUI software is running as this will often crash the Windows drivers.

General Purpose Outputs (GPO)

The GPO3:0 pins are connected to header J12. J12 is conveniently located near

the prototyping area, so the user can easily connect optional circuitry to them.

Note that the GPO pins are also connected to LEDs, D1-D4, and pull up and pull

down resistors which set the 5171 device address during reset. Consideration

must be given to how any application circuitry that is added interacts with these

other functions.

Hardware Set-up

1. Connect a power supply to the V+, V-, +5V, +48V, CHAS and GND

connectors. Do not turn on power yet.

2. Plug in the audio input and output

3. Attach a USB cable to the demo board, but do not plug it into the PC yet

4. Turn on the power supply

5. Turn on phantom power to microphone (if appropriate)

6. Plug USB cable into PC. Windows should go through its procedure for discov-

ering the new USB peripheral and loading its driver.

Document 600134 Rev 02 Page 5 of 16 THAT 1570/5171-DEMO User’s Guide

THAT Corporation; 45 Sumner Street; Milford, MA 01757-1656; US

Tel: +1 508 478 9200; Fax: +1 508 478 0990; Web: www.thatcorp.com

7. Once the Windows driver has been loaded, launch the THAT Corporation

MicPreController GUI application. See software section (below) for further

instructions on operating the GUI.

8. When finished, close the MicPreController GUI first, then power down the

demo board. Unplugging the USB cable before the demo board is powered

down will likely crash the Windows drivers.

Software Set-up

Installation

1. Copy the files from the supplied Software CD into a folder on your PC hard

drive.

Document 600134 Rev 02 Page 6 of 16 THAT 1570/5171-DEMO User’s Guide

THAT Corporation; 45 Sumner Street; Milford, MA 01757-1656; US

Tel: +1 508 478 9200; Fax: +1 508 478 0990; Web: www.thatcorp.com

Figure 2. Control GUI

2. Run the software installer pro

ram (double-click

"1570_5171_Demo_Setup.msi"). The installer automatically detects your

operating system and configures the appropriate drivers without any further

input from you. You will see a "DOS box" and Windows dialogue box temporar-

ily appear and then disappear during the process. Once the software installa-

tion process is complete, you will find an icon labeled "THAT 1570 5171 Demo"

on your desktop and a new THAT Corporation group in your start menu.

Operation

1. Apply power to the demo board, then plug the demo board into the PC via USB.

2. Launch the MicPreController GUI application.

3. The USB interface on the demo board will appear in Windows as a new COM

port. Click the COM drop down menu in the MicPreController application

and select the COM port associated with the USB module.

4. The GUI should now be connected to the demo board and ready to control its

parameters. The GUI initially turns on LED1 as an indication that it is

successfully communicating with the demo board. If LED1 is not lit, confirm

proper cable connections and that you selected the correct COM port in the

previous step.

5. Select “Immediate Update” or “Update on Zero Crossings” via the Gain Mode

drop down box, depending on your preference.

6. Move the gain slider to adjust gain of the 5171. Gains are continuously

adjusted as you move the slider. Note that gain settings of 1-7dB are invalid.

You may also adjust the gain slider by first giving it scope (clicking it with the

mouse) and then pressing the UP and DOWN arrow keys on your computer

keyboard, or by clicking the up or down arrow buttons next to the numeric

gain text box below the gain slider. The Step Size box in the Options area

allows you to set how many decibels the slider changes when you press the

UP/DOWN and arrow keys.

Jumper Options

T-Bias Jumper, J4

The input circuit provides a jumper (J4) which enables/disables the “T-Bias”

function. With a shunt intalled on J4, T-Bias is disabled and the circuit provides

a 2 kΩdiferential input impedance to the XLR input. With the shunt removed

from J4, T-Bias is enabled and provides a high common mode impedance (ideal

for both mic and line inputs) but maintains a modest differential impedance.

VCM Jumper/Input, J6

The output attenuator (U3) is normally biased at 0 VDC via R30 connected to

ground through a shunt on jumper J6. If the J6 shunt is removed, a bias voltage

may be input via J6, e.g. the common mode voltage output pin (VCOM) of an A/D

Converter.

Document 600134 Rev 02 Page 7 of 16 THAT 1570/5171-DEMO User’s Guide

THAT Corporation; 45 Sumner Street; Milford, MA 01757-1656; US

Tel: +1 508 478 9200; Fax: +1 508 478 0990; Web: www.thatcorp.com

External SPI Host Jumpers & Connectors

The demo board has two connectors, J8 and J10, for connecting up to 8 boards

to an external SPI master device, such as a microcontroller. J8 is not installed at

the factory and it is up to the user to add it if required. Note also that current

limiting resistors R34, R36, R40, and R41 must be installed with the appropriate

value for the application. Please contact THAT Corporation technical support for

assistance.

Document 600134 Rev 02 Page 8 of 16 THAT 1570/5171-DEMO User’s Guide

THAT Corporation; 45 Sumner Street; Milford, MA 01757-1656; US

Tel: +1 508 478 9200; Fax: +1 508 478 0990; Web: www.thatcorp.com

ppendix A. Schematic Diagram

Document 600134 Rev 02 Page 9 of 16 THAT 1570/5171-DEMO User’s Guide

THAT Corporation; 45 Sumner Street; Milford, MA 01757-1656; US

Tel: +1 508 478 9200; Fax: +1 508 478 0990; Web: www.thatcorp.com

+48V

VA+

VA-

VA+

VA-

VA+

INPUT

PHANTOM

POWER

OUTPUT

close to chip

49R9

C24

22p

2k15

SW1

6C11

100p

C17

22p

S1DB

THAT5171

U2A

TP3

J18

OPEN

R24

1k2

0.1%

1M2

C19

22p

C25

100n

TP1

22u NP

22p

100n

22u NP

C14

22p

R16

1M2

C22

100p

49R9 R11

49R9

1k13

R13

49R9

R18

49R9

R20

49R9

R29

VA-

4k99

R28

10k

R26

49R9

U3B

2114

U3A

2114

VA+

R30

2k49 C28

100n

C29

100n

1570

10 17 12

C13

22p

+C27

47u

D11

RED

C23

100n

TP2

R12

2k15

2k7

R31

1M2

R32

4148

R10

C12

220p

22p C10

47u

C16

47u

22p

9k09

220p

R42

6k81

C26

22p

R27

4k99

J19

OPEN

C18

22p

R15

1k13

T-BIAS

ENABLE

VCM

INPUT

USB_CS

USB_SCK

USB_SDI

SPI_SCK

SPI_SDI

SPI_SDO

SPI_CS

USB_SDO

3V3

+5V

USB

CONTROLLER

SPI HOST

SELECT R38

10K R39

10K

J11

DLP-232PC

CH3 1

CH4 2

CH5 3

CH2 4

CH1 5

CH9 6

GND 7

CH10 8

PORTVCC 9

GND

10 CH11

11 CH12

12 CH13

13 CH14

14 CH8

15 CH7

16 CH6

17 MCLR

GND VCC

74AHCT1G125

EXT_SCK

SEE NOTE 1

EXT_SDI

EXT_SDO

EXT_CS

J10

R58

J22

J9 1

R37

10k

SN74CB3T3257

R35

10k

C45

100n

C30

100n

3V3

VA+

VA-

RESET

R44

10k

R43

22M

R45

10k

C34

100n

R52

330

3V3

R50

330

SW2

R46

10k

C33

1n U6

ADM706SARZ

1VCC

2GND

3PFI

4PFO 5

WDI 6

RST 7

WDO 8

Red

U2B

THAT5171

VDD

13 VDD

DGND

12 DGND

VA+

AGND

10 AGND

VA-

CS 16

RST 15

SCK 17

SDI 18

SDO 19

BSY 22

TRC 14

GPO0 23

GPO1 24

GPO2 25

GPO3 26

C32

100n

C35

100n

C31

100n

GPO

J12

R54

330

3V3

Red

R56

330

3V3

Red

VA+

VA-

+5V

+48V

3V3

BLK

V-

RED

V+

GRN

GND

BLU

+5V

YLW

+48V

GRN

PHANTOM GND

D14

S1DB

C38

100n

C40

10u

J13

+C44

22u

J17

D13

S1DB

J14

D15

S1DB

J15

+C37

22u

C43

100n

+C42

22u

+C39

22u

D12

S1DB

J16

C41

100n

J20

TP5

R57

MAX604

1GND

2GND

3OFF

4SET 5

GND 6

GND 7

OUT 8

C36

100n

Appendix B. Bill of Materials

DSS4320T-7Diodes, IncNPN, 20V, 2ADSS4320TQ1130

22-28-4363MolexConn., HEADER 36POS .100

VERT GOLD

CON3J22129

3760-4PomonaConn., 5-way binding post,

Yellow

5WBP, YLWJ17128

3760-6PomonaConn., 5-way binding post, Blue5WBP, BLUJ16126

3760-0PomonaConn., 5-way binding post,

Black

5WBP, BLKJ15125

3760-5PomonaConn., 5-way binding post,

Green

5WBP, GRNJ14, J20224

3760-2PomonaConn., 5-way binding post, Red5WBP, REDJ13123

22-28-4363MolexConn., HEADER 36POS .100

VERT GOLD

CON5J12122

DLP-232PCDLPPCB, USB ModuleDLP-232PCJ11121

22-28-4363MolexConn., HEADER 36POS .100

VERT GOLD

CON6J10120

OPENMolexConn., HEADER 36POS .100

VERT GOLD

CON6J8119

382811-6TYCOConn, shunt, 2-pos, 100milSHUNT-2POSJ5, J7, J21318

22-28-4363MolexConn., HEADER 36POS .100

VERT GOLD

CON2J4, J6, J9317

NRJ6HF-1Neutrik

Conn., Phone Jack, TRSNRJ6HF-1J3116

NCJ6FI-HNeutrikConn., Combo, PCBNCJ6FI-HJ2115

NC3MAHNeutrikConn., XLR, Male, PCBNC3MAHJ1114

CDSU4148ComchipDiode, DIODE SWITCHING

75V 150MA

4148D6, D9213

S1DB-13Diodes, IncDiode, RECTIFIER GPP SMD

200V 1A

S1DBD5, D7, D8, D10,

D12, D13, D14,

D15

812

SLA-560LT3FRohmLED, red, T1REDD1, D2, D3, D4,

D11

511

EEV-TG1J220PPanasonicCap, EL, 20%, 63V, 1ohm22uFC44110

ECJ-2FB1A106KPanasonicCap., 10V,10%, X5R10uFC4019

EEV-FC1E220PPanasonicCap. EL, 20%, 25V22uFC37, C39, C4238

ECJ-2VB1H102KPanasonicCap., 50V,10%, X7R1nFC3317

ECJ-2YB1H104KPanasonicCap., 50V, 5%, NPO100PFC11, C2226

EEV-TG1J470PPanasonicCap, EL, 20%, 63V, 1ohm47UFC10, C16, C2735

ECJ-2YB1H104KPanasonicCap., 50V,10%, X7R100nFC7, C23, C25,

C28, C29, C30,

C31, C32, C34,

C35, C36, C38,

C41, C43, C45

154

ECJ-2VC1H221JPanasonicCap., 50V, 5%, NPO220pFC4, C9, C12,

C15, C21

ECJ-2VC1H220JPanasonicCap., 50V, 5%, NPO22pFC3, C5, C6, C8,

C13, C14, C17,

C18, C19, C24,

C26

112

UWP1C220MCL1GBNichiconCap. EL, nonpol, 20%, 16V22uF/NPC1, C221

MFR PNMFRDescriptionValueRefQtyItem

Document 600134 Rev 02 Page 10 of 16 THAT 1570/5171-DEMO User’s Guide

THAT Corporation; 45 Sumner Street; Milford, MA 01757-1656; US

Tel: +1 508 478 9200; Fax: +1 508 478 0990; Web: www.thatcorp.com

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