THAT Corporation 1570-5171 Digital Microphone Preamplifier Chip Set

THAT 1570/5171 Digitally Controlled Microphone Preamplifier				STATUS Active RoHS Compatible

Key Specifications	Packaging/Pricing/ Samples	Design Notes	Related Products	Additional Resources
IMPORTANT: The 1570/5171 combination is not recommended for new designs. For your new circuits designs see our latest model 1580/5171 Digitally Controlled Microphone Preamplifier. The 1580 audio preamplifier is pin compatible with 1570 and offers nearly identical specifications.
Features / Applications / Description

FEATURES
• Versatile two-chip solution:
- 1570 Programmable analog gain block
- 5171 Digital gain controller

• Accommodates full pro audio levels
  +21 dBu max input @ min gain and ±15V supplies

• Programmable gain:
+5.6 dB, +13.6 ~ 68.6 dB in 1dB steps

• Low Noise: -128 dBu EIN, 68.8 dB gain, Rs = 150 Ω

• Low THD+N: 0.0003% @ 21.6 dB gain

• Integrated servo minimizes dc offset

• Integrated zero crossing detector minimizes zipper noise

• Addressable SPI control interface with
   read-back Operates up to 10MHz

• Four general purpose outputs (GPOs)

• Small footprint:
   4 x 4 mm QFN16 (1570)
   7 x 7 mm QFN32 (5171)

Datasheet Download 5171 Datasheet (362 kB) High Performance Digital Preamplifier Controller 1570 Datasheet (130kB) Differential Audio Preamplifier	Demo Board Datasheet & Software 1570-5171-DEMO Datasheet (392 kB PDF file) 1570-5171-DEMO Software (1.125 MB ZIP file)

THAT 1570/5171 Digital Microphone Preamp Circuit

DESCRIPTION

The THAT1570 and THAT5171 ICs enable digitally controlled microphone preamplifier applications with unprecedented 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 from 13.6dB to 68.6dB in 1dB increments. 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 1.5 mV.

Four general purpose outputs on the 5171 can be connected to a variety of peripheral functions, e.g. input pad, phantom power switches, signal routing switches, LED indicators, etc. The addressable SPI interface on the 5171 supports read-back, enabling fault-tolerant control software to verify proper operation. Separating the analog mic pre front end (THAT1570) from the digital functions and switched resistor ladder (THAT5171) allows each IC to be optimized for high performance.

Key Specifications (see 5171 datasheet for complete specifications)

Parameter	Conditions	1570/5171 Combination	Units
Analog Supply Voltage	Referenced to AGND	5 - 17	V
Digital Supply Voltage	Referenced to DGND	3.0 - 3.6	V
Analog Supply Current	No Signal	15.8	mA
Digital Supply Current	No Signal	2	uA
Max Differential Input Level	—	21	dB
Max Differential Output Level	—	27	dB
Equivalent Input Noise, Rs = 150 Ω	0 dB gain 30 dB gain 60 dB gain	-108 -124 -128	dBu
THD + N	0 dB gain 30 dB gain 60 dB gain	0.0006 0.0005 0.006	%
Bandwidth (small signal)	0 dB gain 30 dB gain 60 dB gain	6 1.7 170	MHz MHz kHz
Slew Rate	—	53	V/µs
Dynamic Range	Power supply voltage: ±17V 0 dB gain 30 dB gain 60 dB gain	127 121 95	dB

Gain settings include 5.6 dB output attenuator

Packaging / Pricing / Samples

Model	Package	Order Number	Pricing (1000)	Min Order Quantity	Reference
1570	16 pin QFN	1570N16-U	$10.35*	92	Request Samples
1570	16 pin QFN Tape & Reel**	1570N16-UR		2000
5171	32 pin QFN	5171N32-U		52
5171	32 pin QFN Tape & Reel**	5171N32-UR		2000
1570/5171 Demo Board	—	1570/5171DEMO	$250.00	1
All 1570 and 5171 parts are RoHS compliant. Minimum order quantity (MOQ) is one tube or one reel. Parts must be ordered in multiples of the MOQ. Samples are available to qualified applicants. Pricing is subject to change. * Price when 1570 and 5171 are purchased as a pair. Pricing varies when purchased separately. **There is a small additional charge for tape and reel packaging.

Design Notes (as PDF files)

Design Note 140 Input and Output Circuits for THAT Preamplifier ICs (244k)

More Analog Secrets Your Mother Never Told You (915k)
At the 127th AES Convention attendees were invited to attend a THAT exhibitor seminar — "More Analog Secrets Your Mother Never Told You". A sequel to our popular first "Analog Secrets" seminar, this new presentation exposes more design secrets including “extreme performance” microphone preamps, protecting audio inputs/outputs during phantom power faults, and maintaining high dynamic range in low cost applications.

Related Products

Differential Audio Preamplifiers
THAT 1580	Low Noise Differential Audio Preamplifier	1580 Datasheet
THAT 1583	Low Noise Differential Audio Preamplifier	1583 Datasheet
Gain Controllers
THAT 5171	Digital Preamplifier Controller	5171 Datasheet
THAT 5173	Low-Cost Digital Preamplifier Controller	5173 Datasheet
THAT 5263	2 Channel Digital Preamplifier Controller	5263 Datasheet
Digitally Controlled Microphone Preampifiers
THAT 1580/5171	5171 Digital Microphone Preamplifier Chip Set

THAT 1580/5173	5173 Digital Microphone Preamplifier Chip Set
THAT 1583/5173	5173 Digital Microphone Preamplifier Chip Set

THAT 1580/5263	5263 Digital Microphone Preamplifier Chip Set
THAT 1583/5263	5263 Digital Microphone Preamplifier Chip Set

THAT 626X	626x Dual Programmable-Gain Preamplifier/ADC Driver	626x Datasheet
Audio Preampifiers
THAT 1510/1512	Low Noise Single Ended Output Audio Preamplifiers	1510/1512 Datasheet

Additional Resources

Digitally Controlled Microphone Preamplifier Selector
A side by side comparison of the features and specifications of our digitally controlled microphone preamplifier chip sets.

1570/5171 Digitally-Controlled Mic Preamp Demo Board - The THAT 1570/5171 Digitally-Controlled Mic Preamp Demo Board (US$250) 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. See the 1570/5171 DEMO User's Guide for more information.

1570 Material Data Declaration Sheet
Material Data Declaration Sheets (MDDS) disclose the hazardous materials in our integrated circuits as required by the European RoHS directive.

5171 Material Data Declaration Sheet
Material Data Declaration Sheets (MDDS) disclose the hazardous materials in our integrated circuits as required by the European RoHS directive.

THAT 1570/5171 Digitally Controlled Microphone Preamplifier

THAT 1570/5171
Digitally Controlled Microphone Preamplifier