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Bottom Port PDM Digital Output Multi-Mode Microphone
GENERAL DESCRIPTION
The T3903 is a multi-mode, low noise digital MEMS
microphone in a small package. The T3903 consists of a
MEMS microphone element and an impedance converter
amplifier followed by a fourth-order Σ-Δ modulator. The digital
interface allows the pulse density modulated (PDM) output of
two microphones to be time multiplexed on a single data line
using a single clock.
The T3903 has multiple modes of operation: High Quality,
Low-Power (AlwaysOn), and Sleep. The T3903 has high SNR in
all operational modes. It has 133 dB SPL AOP in High Quality
Mode and 120 dB SPL AOP in Low-Power mode.
The T3903 is available in a standard 3.5 × 2.65 × 0.98 mm
surface-mount package. It is reflow solder compatible with
no sensitivity degradation.
FUNCTIONAL BLOCK DIAGRAM
ICS-51360
T3903
ADC
POWER
MANAGEMENT
This document contains information on a preproduction
product. Specifications and information herein are
subject to change without notice
CLK
PDM
MODULATOR
DATA
CHANNEL
SELECT
1745 Technology Drive, San Jose, CA 95110 U.S.A
APPLICATIONS
•
Smartphones
•
Microphone Arrays
•
Tablet Computers
•
Cameras
FEATURES
SPEC
HIGH QUALITY MODE
Sensitivity
SNR
Current
AOP
Clock
•
3.5 × 2.65 × 0.98 mm surface-mount package
•
Extended frequency response from 40 Hz to >20 kHz
•
Sleep Mode: 9 µA
•
Fourth-order Σ-Δ modulator
•
Digital pulse density modulation (PDM) output
•
Compatible with Sn/Pb and Pb-free solder processes
•
RoHS/WEEE compliant
ORDERING INFORMATION
PART
MMICT3903-00-012
EV_T3903-FX
TDK Corporation
+1(408) 988–7339
www.tdk.com
T3903
LOW-POWER MODE
−37 dB FS ±1 dB
66 dBA
590 µA
133 dB SPL
2.0 MHz to 3.3 MHz
400 kHz to 800 kHz
TEMP RANGE
−40°C to +85°C
13" Tape and Reel
—
Document Number: DS-000358
Revision: 1.0
Release Date: 5/5/2020
−26 dB FS ±1 dB
63 dBA
220 µA
120 dB SPL
PACKAGING
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Table of Contents
Related Manuals for TDK T3903
Summary of Contents for TDK T3903
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Page 1: General Description
590 µA 220 µA 133 dB SPL 120 dB SPL The T3903 is available in a standard 3.5 × 2.65 × 0.98 mm Clock 2.0 MHz to 3.3 MHz 400 kHz to 800 kHz surface-mount package. It is reflow solder compatible with no sensitivity degradation. -
Page 2: Table Of Contents
Table 8. Pin Function Descriptions ............................... 9 Typical Performance Characteristics ..............................10 Theory Of Operation ..................................... 11 PDM Data Format ..................................11 Table 9. T3903 Channel Setting ..............................11 PDM Microphone Sensitivity ..............................11 Applications Information ..................................13 Low-Power Mode..................................13 Dynamic Range Considerations .............................. - Page 3 T3903 Board Wash ....................................18 Outline Dimensions ....................................19 Ordering Guide ..................................19 Revision History ..................................20 Compliance Declaration Disclaimer ..............................21 Page 3 of 21 Document Number: DS-000358 Revision: 1.0...
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Page 4: Specifications
T3903 SPECIFICATIONS TABLE 1. ACOUSTICAL/ELECTRICAL CHARACTERISTICS – GENERAL = 25°C, VDD = 1.8 V to 3.3 V, SCK = 2.4 MHz, C = 30 pF unless otherwise noted. Typical specifications are not guaranteed. LOAD PARAMETER CONDITIONS UNITS NOTES PERFORMANCE Directionality... - Page 5 T3903 TABLE 3. ACOUSTICAL/ELECTRICAL CHARACTERISTICS – LOW-POWER MODE = 25°C, VDD = 1.8 V to 3.3 V, SCK = 768 kHz, C = 30 pF unless otherwise noted. Typical specifications are not guaranteed. LOAD PARAMETER CONDITIONS UNITS NOTES Sensitivity 1 kHz, 94 dB SPL −27...
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Page 6: Timing Diagram
T3903 TABLE 5. PDM DIGITAL INPUT/OUTPUT = 25°C, 1.8 V < VDD < 3.3 V , unless otherwise noted. PARAMETER CONDITIONS UNITS NOTES MODE SWITCHING Sleep Time Time from f falling <200 kHz Wake-Up Time High Quality mode, Sleep Mode to f >1.2... -
Page 7: Absolute Maximum Ratings
T3903 ABSOLUTE MAXIMUM RATINGS Stress above those listed as Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings only and functional operation of the device at these conditions is not implied. Exposure to the absolute maximum ratings conditions for extended periods may affect device reliability. -
Page 8: Soldering Profile
Time +25°C (t ) to Peak Temperature 5 min max 25°C *The reflow profile in Table 7 is recommended for board manufacturing with TDK MEMS microphones. All microphones are also compatible with the J-STD-020 profile Page 8 of 21 Document Number: DS-000358... -
Page 9: Pin Configurations And Function Descriptions
T3903 PIN CONFIGURATIONS AND FUNCTION DESCRIPTIONS SELECT DATA Figure 3. Pin Configuration (Top View, Terminal Side Down) TABLE 8. PIN FUNCTION DESCRIPTIONS NAME FUNCTION DATA Digital Output Signal (DATA1 or DATA2) Left Channel or Right Channel Select: DATA 1 (right): SELECT tied to GND SELECT DATA 2 (left): SELECT tied to VDD. -
Page 10: Typical Performance Characteristics
T3903 TYPICAL PERFORMANCE CHARACTERISTICS 20.0 10.00 10.0 1.00 0.10 High Quality Mode -10.0 Low Power Mode 0.01 -20.0 1000 10000 INPUT AMPLITUDE (dB SPL) FREQUENCY (Hz) Figure 5. THD + N Figure 4. Typical Audio Frequency Response, High Quality Mode 0.00... -
Page 11: Theory Of Operation
PDM DATA FORMAT The output from the DATA pin of the T3903 is in pulse density modulated (PDM) format. This data is the 1-bit output of a fourth- order Σ-Δ modulator. The data is encoded so that the left channel is clocked on the falling edge of CLK, and the right channel is clocked on the rising edge of CLK. - Page 12 T3903 This definition of a 0 dB FS signal must be understood when measuring the sensitivity of the T3903. A 1 kHz sine wave at a 94 dB SPL acoustic input to the T3903 results in an output signal with a −26 dB FS level (low-power mode). The output digital word peaks at −26 dB below the digital full-scale level.
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Page 13: Applications Information
0 dB FS. To fully use the 105 dB dynamic range of the output data of the T3903 in a design, the digital signal processor (DSP) or codec circuit following it must be chosen carefully. The decimation filter that inputs the PDM signal from the T3903 must have a dynamic range sufficiently better than the dynamic range of the microphone so that the overall noise performance of the system is not degraded. - Page 14 The DATA signal does not need to be buffered in normal use when the T3903 microphone(s) is placed close to the codec on the PCB. If the DATA signal must be driven over a long cable (>15 cm) or other large capacitive load, a digital buffer may be required. Only use a signal buffer on the DATA line when one microphone is in use or after the point where two microphones are connected (see Figure 14).
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Page 15: Sleep Mode
T3903 outputs data within 0.5 dB of its settled sensitivity. START-UP TIME The start-up time of the T3903 is typically 7 ms, measured by the time from when power and clock are enabled until sensitivity of the output signal is within 0.5 dB of its settled sensitivity. -
Page 16: Supporting Documents
AN-100, MEMS Microphone Handling and Assembly Guide AN-1003, Recommendations for Mounting and Connecting the TDK, Bottom-Ported MEMS Microphones AN-1112, Microphone Specifications Explained AN-1124, Recommendations for Sealing TDK Bottom-Port MEMS Microphones from Dust and Liquid Ingress AN-1140, Microphone Array Beamforming Page 16 of 21 Document Number: DS-000358 Revision: 1.0... -
Page 17: Pcb Design And Land Pattern Layout
Avoid applying solder paste to the sound hole in the PCB. A suggested solder paste stencil pattern layout is shown in Figure 16. The response of the T3903 is not affected by the PCB hole size as long as the hole is not smaller than the sound port of the microphone (0.375 mm in diameter). -
Page 18: Handling Instructions
T3903 HANDLING INSTRUCTIONS PICK AND PLACE EQUIPMENT The MEMS microphone can be handled using standard pick-and-place and chip shooting equipment. Take care to avoid damage to the MEMS microphone structure as follows: Use a standard pickup tool to handle the microphone. Because the microphone hole is on the bottom of the package, the •... -
Page 19: Outline Dimensions
T3903 OUTLINE DIMENSIONS Figure 17. 5-Terminal Chip Array Small Outline No Lead Cavity [LGA_CAV] 3.5 mm × 2.65 mm × 0.98 mm Body Dimensions shown in millimeters Dimension tolerance is ±0.15 mm unless otherwise specified Figure 18. Package Marking Specification (Top View) -
Page 20: Revision History
T3903 REVISION HISTORY REVISION DATE REVISION DESCRIPTION 1/15/20 Initial preliminary version 5/5/20 Initial release Page 20 of 21 Document Number: DS-000358 Revision: 1.0... -
Page 21: Compliance Declaration Disclaimer
This information furnished by TDK, Inc. (“TDK”) is believed to be accurate and reliable. However, no responsibility is assumed by TDK for its use, or for any infringements of patents or other rights of third parties that may result from its use. Specifications are subject to change without notice. TDK reserves the right to make changes to this product, including its circuits and software, in order to improve its design and/or performance, without prior notice.