Fairchild FAN3850TUC15X35 Microphone pre-amplifier with temperature compensation and digital output Datasheet

FAN3850T
Microphone Pre-Amplifier with Temperature
Compensation and Digital Output
Description
Features

Optimized for Mobile Handset and Notebook PC
Microphone Applications





Accepts Input from Electret Condenser Microphones

Low Input Capacitance, High PSR, 20kHz
Pre-Amplifier







Low-Power, 1.5µA Sleep Mode
Pulse Density Modulation (PDM) Output
Standard 5-Wire Digital Interface
Amplifier Gain: 15.7dB
Negative Temperature Coefficient to Compensate for
ECM Positive Temperature Coefficient
The FAN3850T integrates a pre-amplifier, LDO, and
Analog-to-Digital Converter (ADC) to convert Electret
Condenser Microphone (ECM) outputs to digital Pulse
Density Modulation (PDM) data streams. The preamplifier accepts analog signals from the ECM and drives
an over-sampled sigma delta ADC and outputs PDM
data. The PDM digital audio has the advantage of noise
rejection and interface-to-mobile handset processors.
The FAN3850T is powered from the system supply rails
up to 3.63V, with a low power consumption of only
0.85mW, and less than 20μW in Power-Down Mode.
The device compensates for the temperature variation
of the microphone element to achieve a flat sensitivity
response over-temperature.
Typical 420µA Supply Current
Signal to Noise Ratio of 62.4dB(A)
Input Clock Frequency Range of 1-4MHz
Integrated Low Drop-Out Regulator (LDO)
INPUT
Pre-Amp
Small 1.26mm x 0.86mm 6-Ball WLCSP
Applications




Sleep
Mode Ctrl
LDO
Total Harmonic Distortion: 0.01%

ADC
GND
Electret Condenser Microphones with Digital Output
Mobile Handsets
Headset Accessories
Personal Computers (PC)
CLOCK
DATA
SELECT
Figure 1. Block Diagram
Ordering Information
Part Number
Gain
Option
Operating
Temperature Range
FAN3850TUC15X35
15.7dB
-30°C to +85°C
Package
6-Ball, Wafer-Level Chip-Scale
Package (WLCSP)
Packing
Method
3000 Unit
Tape & Reel
Note:
1. Alternate gain options and temperature coefficient slopes are possible. Please contact a Fairchild representative.
© 2011 Fairchild Semiconductor Corporation
FAN3850T • Rev. 3.0.0
www.fairchildsemi.com
FAN3850T — Microphone Pre-Amplifier with Temperature Compensation and Digital Output
October 2011
Figure 2. Pin Configuration (Top View)
Pin Definitions
Pin#
Name
Type
A1
CLOCK
Input
Clock Input
B1
GND
Input
Ground Pin
C1
DATA
Output
A2
SELECT
Input
Rising or Falling Clock-Edge Select
B2
INPUT
Input
Microphone Input
C2
VDD
Input
Device Power Pin
© 2011 Fairchild Semiconductor Corporation
FAN3850T • Rev. 3.0.0
Description
PDM Output – 1-Bit ADC
FAN3850T — Microphone Pre-Amplifier with Temperature Compensation and Digital Output
Pin Configuration
www.fairchildsemi.com
2
Stresses exceeding the absolute maximum ratings may damage the device. The device may not function or be
operable above the recommended operating conditions and stressing the parts to these levels is not recommended.
In addition, extended exposure to stresses above the recommended operating conditions may affect device reliability.
The absolute maximum ratings are stress ratings only.
Symbol
VDD
VIO
ESD
Parameter
Min.
Max.
Unit
DC Supply Voltage
-0.3
4.0
V
Analog and Digital I/O
-0.3
VCC+0.3
V
Human Body Model, JESD22-A114(2),
All Pins Except Microphone Input
±7
kV
Human Body Model, JESD22-A114(2),
Microphone Input
±300
V
Note:
2. This device is fabricated using CMOS technology and is therefore susceptible to damage from electrostatic
discharges. Appropriate precautions must be taken during handling and storage of this device to prevent
exposure to ESD.
Reliability Information
Symbol
TJ
TSTG
TREFLOW
JA
Parameter
Min.
Typ.
Junction Temperature
Storage Temperature Range
-65
Peak Reflow Temperature
Thermal Resistance, JEDEC Standard,
Multilayer Test Boards, Still Air
Max.
Unit
+150
°C
+125
°C
+260
°C
90
°C/W
Recommended Operating Conditions
The Recommended Operating Conditions table defines the conditions for actual device operation. Recommended
operating conditions are specified to ensure optimal performance to the datasheet specifications. Fairchild does not
recommend exceeding them or designing to Absolute Maximum Ratings.
Symbol
Parameter
Min.
TA
Operating Temperature Range
-30
VDD
Supply Voltage Range
1.64
tRF-CLK
Clock Rise and Fall Time
© 2011 Fairchild Semiconductor Corporation
FAN3850T • Rev. 3.0.0
Typ.
Max.
Unit
+85
°C
1.80
3.63
V
10
ns
FAN3850T — Microphone Pre-Amplifier with Temperature Compensation and Digital Output
Absolute Maximum Ratings
www.fairchildsemi.com
3
Unless otherwise specified, all limits are guaranteed for TA=25°C, VDD=1.8V, VIN=94dB (SPL), fCLK=2.4MHz,
duty cycle = 50%, and CMIC=15pF.
Symbol
Parameter
Condition
Min.
Typ.
Max.
Unit
1.64
1.80
3.63
V
VDD
Supply Voltage Range
IDD
Supply Current
INPUT=AC Coupled to GND,
CLOCK=On, No Load
420
ISLEEP
Sleep Mode Current
fCLK=GND
1.4
PSR
Power Supply Rejection(7)
INPUT=AC Coupled to GND, Test
Signal on VDD=217Hz Square
Wave and Broad Band Noise(3)
both 100mVP-P
-80
dBFS
INNOM
Nominal Sensitivity
INPUT=94dBSPL
-26
dBFS
SNR
Signal-to-Noise Ratio
fIN=1kHz 1Pa, A-Weighted
62.4
dB(A)
Input Referred Noise(7)
20Hz to 20kHz, A-Weighted
15.7dB Gain
5.3
8.6
µVRMS
%
eN
THD
THD+N
tc
(4)
(5)
Total Harmonic Distortion
(7)
THD and Noise
Temperature Coefficient
(7,11)
(7,11)
fIN=1kHz, INPUT=-26dBFS
0.01
0.10
0.2
1.0
fIN=1kHz, INPUT=-5dBFS
1.0
5.0
fIN=1kHz, INPUT=0dBFS
5.0
10.0
Gain Measured at 50˚C and -10˚C
Input Capacitance
INPUT
RIN
Input Resistance(7,11)
INPUT
VIL
CLOCK & SELECT Input,
Logic LOW Level
VIH
CLOCK & SELECT Input,
Logic HIGH Level
VOL
Data Output, Logic LOW
Level
VOH
Data Output, Logic HIGH
Level
VIN15dB
Maximum Input Signal for
(5)
15.7dB of Gain
Acoustic Overload Point
(11)
8.0
50Hz ≤ fIN ≤ 1kHz, INPUT=-20dBFS
CIN
VOUT
μA
dB/˚C
0.2
pF
GΩ
0.3
V
VDD+0.3
V
0.35×VDD
V
V
0.65×VDD
fIN=1 kHz, THD+N < 10%;
DC Level=0V
503
120
THD < 10%
%
-0.035
>100
1.5
μA
mVPP
dBSPL
Continued on the following page…
© 2011 Fairchild Semiconductor Corporation
FAN3850T • Rev. 3.0.0
FAN3850T — Microphone Pre-Amplifier with Temperature Compensation and Digital Output
Electrical Characteristics
www.fairchildsemi.com
4
Unless otherwise specified, all limits are guaranteed for TA=25°C, VDD=1.8V, VIN=94dB (SPL), fCLK=2.4MHz,
duty cycle = 50%, and CMIC=15pF.
Symbol
Parameter
Condition
Min.
Typ.
Max.
Unit
tA
Time from CLOCK Transition
to Data Becoming Valid
On Falling Edge of CLOCK,
SELECT=GND, CLOAD=15pF
18
43
tB
Time from CLOCK Transition
to Data Becoming Hi-Z
On Rising Edge of CLOCK,
SELECT=GND, CLOAD=15pF
0
5
tA
Time from CLOCK Transition
to Data Becoming Valid
On Rising Edge of CLOCK,
SELECT=VDD, CLOAD=15pF
18
56
tB
Time from CLOCK Transition
to Data Becoming Hi-Z
On Falling Edge of CLOCK,
SELECT=VDD, CLOAD=15pF
0
5
16
ns
Input CLOCK Frequency(8)
Active Mode
1.0
2.4
4.0
MHz
fCLK
(7)
CLKdc
CLOCK Duty Cycle
tWAKEUP
Wake-Up Time(9)
fCLK=2.4MHz
Fall-Asleep Time(10)
fCLK=2.4MHz
tFALLASLEEP
40
0
ns
16
ns
ns
50
60
%
0.35
2.00
ms
0.01
1.00
ms
CLOAD
Load Capacitance on Data
100
pF
Notes:
3. Pseudo-random noise with triangular probability density function. Bandwidth up to 10MHz.
4. Assumes 120dB(SPL) is mapped to 0Dbfs.
5. Assumes an input -41, or -38dBV, depending on the part-specific gain.
6. Verified by design simulation, showing idle tones and low noise level modulation to be typical 96dB.
7. Guaranteed by characterization.
8. All parameters are tested at 2.4MHz. Frequency range guaranteed by characterization.
9. Device wakes up when fCLK ≥ 300kHz.
10. Device falls asleep when fCLK ≤ 70kHz.
11. Guaranteed by design.
12. Temperature coefficient is calculated by measuring gain in db at 50˚C and -10°C and dividing by 60 (Gain(50°C)
– Gain(-10°C)/60).
FAN3850T — Microphone Pre-Amplifier with Temperature Compensation and Digital Output
Electrical Characteristics (Continued)
Figure 3. Interface Timing
© 2011 Fairchild Semiconductor Corporation
FAN3850T • Rev. 3.0.0
www.fairchildsemi.com
5
Unless otherwise specified, all limits are guaranteed for TA=25°C, VDD=1.8V, VIN=94dB(SPL), fCLK=2.4MHz, and duty
cycle=50%.
90.00
80.00
SNR (dBa), THD (dB), SINAD (dB)
70.00
60.00
50.00
40.00
30.00
20.00
10.00
0.00
‐10.00
‐20.00
0.001
0.010
0.100
1.000
10.000
100.000
1000.000
Input Signal (mVpp)
SNR (dBa)
THD (dB)
SINAD (dB)
Figure 4. THD, SINAD, and SNR vs. Input Amplitude
‐100.0
‐90.0
80.0
‐80.0
‐70.0
60.0
‐60.0
‐50.0
40.0
‐40.0
20.0
‐30.0
‐20.0
0.0
0.00
‐1.63
‐3.55
‐5.54
‐7.53
‐9.54
‐11.54
‐13.55
‐15.55
‐17.56
‐19.55
‐25.55
‐31.58
‐37.57
‐43.57
‐49.57
‐55.56
‐61.57
‐65.57
‐71.59
‐77.62
‐83.76
‐20.0
‐89.50
‐10.0
‐95.77
SNR(dBa), THD (dB), SINAD (dB), Noise (dBFs)
100.0
FAN3850T — Microphone Pre-Amplifier with Temperature Compensation and Digital Output
Typical Performance Characteristics
0.0
Signal Output Level (dBFs)
SNR (dBa)
THD (dB)
SINAD (dB)
Noise (dBFS)
Figure 5. THD, SINAD, and SNR vs. Output Level
© 2011 Fairchild Semiconductor Corporation
FAN3850T • Rev. 3.0.0
www.fairchildsemi.com
6
16.6
Averag Gain (dB)
16.4
16.2
16.0
15.8
15.6
15.4
15.2
Temperature ˚C
Figure 6. Gain vs. Temperature (~.035db/˚C)(1)
Note:
13. Alternate temperature coefficient slopes are possible. Please contact a Fairchild representative.
© 2011 Fairchild Semiconductor Corporation
FAN3850T • Rev. 3.0.0
50
40
30
20
0
14.8
10
15.0
FAN3850T — Microphone Pre-Amplifier with Temperature Compensation and Digital Output
16.8
www.fairchildsemi.com
7
VDD
Audio
Output
SPEAKER
CLOCK
INPUT
PreAmp.
DATA
ADC
SELECT
Clk
SDI SDO L/R
Serial Port
Noise Shaper
Low Pass Filter
Interpolation
Decimation
Applications Software
Figure 7. Mono Microphone Application Circuit
VDD
Audio
Output
SPEAKER
CLOCK
INPUT
PreAmp
DATA
ADC
SELECT
Clk SDI SDO L/R
Serial Port
Noise Shaper
Low Pass Filter
VDD
Decimation
CLOCK
INPUT
PreAmp
Applications Software
DATA
ADC
Interpolation
FAN3850T — Microphone Pre-Amplifier with Temperature Compensation and Digital Output
Applications Information
SELECT
Figure 8. Stereo Microphone Application Circuit
© 2011 Fairchild Semiconductor Corporation
FAN3850T • Rev. 3.0.0
www.fairchildsemi.com
8
Applications Information
A 0.1µF decoupling capacitor is required for VDD. It can
be located either inside the microphone or on the PCB
very close to the VDD pin.
A 100Ω resistance is recommended on the clock output
of the device driving the FAN3850T to minimize ringing
and improve signal integrity.
Due to high input impedance, careful consideration
should be taken to remove all flux used during the
reflow soldering process.
For optimal PSR, route a trace to the VDD pin. Do not
place a VDD plane under the device.
© 2011 Fairchild Semiconductor Corporation
FAN3850T • Rev. 3.0.0
FAN3850T — Microphone Pre-Amplifier with Temperature Compensation and Digital Output
Figure 9. MIC Element Drawing
www.fairchildsemi.com
9
F
0.03 C
E
2X
A
A1
B
0.570
(Ø0.120)
CU PAD
0.485
PIN A1
AREA
D
2X
TOP VIEW
(Ø0.220)
SOLDER MASK
0.03 C
RECOMMENDED LAND
PATTERN (NSMD)
0.06 C
0.01 C
0.300
0.254
C
SEATING
PLANE
0.197±0.013
0.080±0.010
E
D
SIDE VIEWS
NOTES:
0.005
0.570
C A B
A. NO JEDEC REGISTRATION APPLIES.
Ø0.120±0.010
6X
B. DIMENSIONS ARE IN MILLIMETERS.
C. DIMENSIONS AND TOLERANCES PER
ASME Y14.5M, 1994.
C
0.485
B
D. DATUM C, THE SEATING PLANE IS DEFINED
BY THE SPHERICAL CROWNS OF THE BALLS.
(Y) +/-0.018
A
1
2
E. PACKAGE TYPICAL HEIGHT IS 273 MICRONS
±23 MICRONS (254-300 MICRONS).
F
F. FOR DIMENSIONS D, E, X, AND Y SEE
PRODUCT DATASHEET.
(X) +/-0.018
BOTTOM VIEW
G. DRAWING FILENAME: UC006AHrev3.
Figure 10. 6-Ball, Wafer-Level Chip-Scale Package (WLCSP)
Table 1.
FAN3850T — Microphone Pre-Amplifier with Temperature Compensation and Digital Output
Physical Dimensions
Product-Specific Dimensions
D
E
X
Y
1.260mm
0.860mm
0.145mm
0.145mm
Ball Composition: SN97.5-Ag2.5
Package drawings are provided as a service to customers considering Fairchild components. Drawings may change in any manner
without notice. Please note the revision and/or date on the drawing and contact a Fairchild Semiconductor representative to verify or
obtain the most recent revision. Package specifications do not expand the terms of Fairchild’s worldwide terms and conditions, specifically the
warranty therein, which covers Fairchild products.
Always visit Fairchild Semiconductor’s online packaging area for the most recent package drawings:
http://www.fairchildsemi.com/packaging/.
© 2011 Fairchild Semiconductor Corporation
FAN3850T • Rev. 3.0.0
www.fairchildsemi.com
10
FAN3850T — Microphone Pre-Amplifier with Temperature Compensation and Digital Output
© 2011 Fairchild Semiconductor Corporation
FAN3850T • Rev. 3.0.0
www.fairchildsemi.com
11
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