FAN3852
Microphone Pre-Amplifier
with Digital Output
Description
The FAN3852 integrates a pre−amplifier, LDO, and ADC that
converts Electret Condenser Microphone (ECM) outputs to digital
Pulse Density Modulation (PDM) data streams. The pre−amplifier
accepts analog signals from the ECM and drives an over−sampled
sigma delta Analog−to−Digital Converter (ADC) and outputs PDM
data. The PDM digital audio has the advantage of noise rejection and
easy interface to mobile handset processors.
The FAN3852 features an integrated LDO and is powered from the
system supply rails up to 3.63 V, with low power consumption of only
0.85 mW and less than 20
mW
in Power−Down Mode.
Features
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WLCSP−6
CASE 567TS
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Optimized for Mobile Handset and Notebook PC Microphone
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Applications
Accepts Input from Electret Condenser Microphones (ECM)
Pulse Density Modulation (PDM) Output
Standard 5−Wire Digital Interface
Low Input Capacitance, High PSR, 20 kHz Pre−Amplifier
Low−Power 1.5
mA
Sleep Mode
Typical 420
mA
Supply Current
SNR of 62 dB (A) for 16 dB Gain
Total Harmonic Distortion 0.02%
Input Clock Frequency Range of 1−4 MHz
Integrated Low Drop−Out Regulator (LDO)
Small 1.242 mm
×
0.842 mm 6−Ball, 0.400 mm pitch standard
WLCSP Package
1.5 kV HBM ESD on MIC Input
CLOCK
A1
A2
SELECT
GND
B1
B2
INPUT
DATA
C1
C2
VDD
Top View
PIN CONFIGURATION
MARKING DIAGRAM
VK&K
&.&2&Z
Pin A1
VK
K
.
2
Z
= Device Identifier
= Lot Run Code
= Pin A1 Mark
= Date Code
= Plant Code
Typical Applications
Electret Condenser Microphones with Digital Output
Mobile Handset
Headset Accessories
Personal Computer (PC)
ORDERING INFORMATION
See detailed ordering and shipping information on page 2
of this data sheet.
©
Semiconductor Components Industries, LLC, 2016
June, 2019
−
Rev. 3
1
Publication Order Number:
FAN3852/D
FAN3852
ORDERING INFORMATION
Part Number
FAN3852UC16X
Operating Temperature Range
−40°C
to 85°C
Package
6 Ball, Wafer−Level
Chip−Scale Package (WLCSP)
Packing Method
†
3000 Units/Tape & Reel
†For information on tape and reel specifications, including part orientation and tape sizes, please refer to our Tape and Reel Packaging
Specifications Brochure, BRD8011/D.
INTERNAL BLOCK DIAGRAM
V
DD
LDO
Sleep
Mode Ctrl
CLOCK
INPUT
Pre*Amp
S−D
ADC
DATA
SELECT
GND
Figure 1. Block Diagram
Table 1. PIN DEFINITIONS
Pin #
A1
B1
C1
A2
B2
C2
Name
CLOCK
GND
DATA
SELECT
INPUT
VDD
Type
Input
Input
Output
Input
Input
Input
Clock Input
Ground Pin
PDM Output
−
1 Bit ADC
Rising or Falling Clock Edge Select
Microphone Input
Device Power Pin
Description
Table 2. ABSOLUTE MAXIMUM RATINGS
Symbol
V
DD
V
IO
ESD
DC Supply Voltage
Digital I/O
Microphone Input
Human Body Model, JESD22−A114, All Pins Except Microphone
Input
Human Body Model, JESD2−A114
−
Microphone Input
Parameter
Min.
−0.3
−0.3
−0.3
±8
±1.5
Max.
4.0
V
DD
+ 0.3
2.2
kV
Unit
V
V
Stresses exceeding those listed in the Maximum Ratings table may damage the device. If any of these limits are exceeded, device functionality
should not be assumed, damage may occur and reliability may be affected.
1. 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.
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FAN3852
Table 3. RELIABILITY INFORMATION
Symbol
T
J
T
STG
T
RFLW
q
JA
Junction Temperature
Storage Temperature Range
Peak Reflow Temperature
Thermal Resistance, JEDEC Standard, Multilayer
Test Boards, Still Air
90
−65
Rating
Min.
Typ.
Max.
+150
+125
+260
Unit
°C
°C
°C
°C/W
2. T
A
= 25°C unless otherwise specified
Table 4. RECOMMENDED OPERATING CONDITIONS
Symbol
T
A
V
DD
T
RF−CLK
Rating
Operating Temperature Range
Supply Voltage Range
Clock Rise and Fall Time
Min.
−400
1.64
1.80
Typ.
Max.
+85
3.63
10
Unit
°C
V
ns
Functional operation above the stresses listed in the Recommended Operating Ranges is not implied. Extended exposure to stresses beyond
the Recommended Operating Ranges limits may affect device reliability.
Table 5. DEVICE SPECIFIC ELECTRICAL CHARACTERISTICS
FAN3852UC16X
Symbol
SNR
e
N
V
IN
Value
Signal−to−Noise Ratio
f
IN
= 1 kHz (1 Pa), A−Weighted
Total Input RMS Noise
20 Hz to 20 kHz, A−Weighted
Maximum Input Signal
f
IN
= 1 kHz, THD + N < 10%, Level = 0 V
Min.
Typ.
62
5.74
6.80
448
Max.
Unit
dB (A)
mV
RMS
mV
PP
3. Guaranteed by characterization and/or design. Not production tested.
Table 6. ELECTRICAL CHARACTERISTICS
Unless otherwise specified, al limits are guaranteed for T
A
= 25°C, V
DD
= 1.8 V, V
IN
= 94 dB (SPL) and f
CLK
= 2.4 MHz.
Duty Cycle = 50% and C
MIC
= 15 pF
Symbol
V
DD
I
DD
I
SLEEP
PSR
Parameter
Supply Voltage Range
Supply Current
Sleep Mode Current
Power Supply Rejection (Note 5)
INPUT = AC Coupled to GND,
CLOCK = On, No Load
f
CLK
= GND
INPUT = AC Coupled to GND,
Test Signal on V
DD
= 217 Hz,
Square Wave and Broadband
Noise (Note 4), Both 100 mV
P−P
INPUT = 94 dBSPL (1 Pa)
f
IN
= 1 KHz, INPUT =
−26
dBFS
50 Hz
≤
f
IN
≤
1 kHz,
INPUT =
−20
dBFS
f
IN
= 1 KHz, INPUT =
−5
dBFS
f
IN
= 1 KHz, INPUT = 0 dBFS
C
IN
R
IN
V
IL
Input Capacitance (Note 8)
Input Resistance (Note 8)
CLOCK & SELECT Input Logic
LOW Level
INPUT
INPUT
>10
0.3
Condition
Min.
1.64
Typ.
1.80
420
1.50
−74
8.0
Max.
3.63
Unit
V
mA
mA
dBFS
IN
NOM
THD
THD+N
Nominal Sensitivity (Note 6)
Total Harmonic Distortion (Note 7)
THD and Noise (Note 5)
−26
0.02
0.2
1.0
5.0
1.3
0.20
1.0
5.0
10.0
dBFS
%
%
pF
GW
V
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FAN3852
Table 6. ELECTRICAL CHARACTERISTICS
(continued)
Unless otherwise specified, al limits are guaranteed for T
A
= 25°C, V
DD
= 1.8 V, V
IN
= 94 dB (SPL) and f
CLK
= 2.4 MHz.
Duty Cycle = 50% and C
MIC
= 15 pF
Symbol
V
IH
V
OL
V
OH
V
OUT
t
A
t
B
t
A
t
B
f
CLK
CLK
dc
t
WAKEUP
t
FALLASLEAP
C
LOAD
Parameter
CLOCK & SELECT Input Logic
HIGH Level
Data Output Logic LOW Level
Data Output Logic HIGH Level
Acoustic Overload Point (Note 8)
Time from CLOCK Transition to
Data becoming Valid
Time from CLOCK Transition to
Data becoming HIGH−Z
Time from CLOCK Transition to
Data becoming Valid
Time from CLOCK Transition to
Data becoming HIGH−Z
Input CLOCK Frequency (Note 9)
CLOCK Duty Cycle (Note 5)
Wake−Up Time (Note 10)
Fall−Asleep Time (Note 11)
Load Capacitance on Data
f
CLK
= 2.4 MHz
f
CLK
= 2.4 MHz
0
THD+N < 10%
On Falling Edge of CLOCK,
SELECT = GND, C
LOAD
= 15 pF
On Rising Edge of CLOCK,
SELECT = GND, C
LOAD
= 15 pF
On Rising Edge of CLOCK,
SELECT = V
DD
, C
LOAD
= 15 pF
On Falling Edge of CLOCK,
SELECT = V
DD
, C
LOAD
= 15 pF
Active Mode
0.65*V
DD
120
18
0
18
0
1.0
40
43
5
58
5
2.4
50
0.35
0.01
16
4.0
60
2.00
1.00
100
16
Condition
Min.
1.5
Typ.
Max.
V
DD
+0.3
0.35*V
DD
Unit
V
V
V
dBSPL
ns
ns
ns
ns
MHz
%
ms
ms
pF
Product parametric performance is indicated in the Electrical Characteristics for the listed test conditions, unless otherwise noted. Product
performance may not be indicated by the Electrical Characteristics if operated under different conditions.
4. Pseudo−random noise with triangular probability density function. Bandwidth up to 10 MHz.
5. Guaranteed by characterization. Not production tested.
6. Assuming that 120 dB (SPL) is mapped to 0 dBFS.
7. Assuming an input of
−45
dBV.
8. Guaranteed by design. Not production tested.
9. All parameters are tested at 2.4 MHz. Frequency range guaranteed by characterization.
10. Device wakes up when f
CLK
≥
300 kHz.
11. Device falls asleep when f
CLK
≤
70 kHz.
CLK
DATA1
Data
Valid
HIGH−Z
t
A
DATA2
(For possible 2
nd
Mic)
t
B
Data
Valid
HIGH−Z
t
A
t
A
−
Microphone delay from clock edge to data assertion.
t
B
−
Microphone delay from clock edge to high−impedance state.
t
A
> t
B
to have interim HIGH−Z state in both signals.
Figure 2. Interface Timing
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FAN3852
TYPICAL PERFORMANCE CHARACTERISTICS
Unless otherwise specified, all limits are guaranteed for T
A
= 25°C, V
DD
= 1.8 V, V
IN
= 94 dB (SPL), f
CLK
= 2.4 MHz and duty Cycle = 50%.
Amplitude Spectrum [dBFS], Fo = 1000.2135 Hz, Fs = 2.400000 MHz, SNR = 56.89 dB, SNR = 60.88 dB(A), THD = 0.008 %
−20
THD = 81.95 dB
SNR = 60.88 dBc(A)
SINAD = 56.87 dB
ENOB = 13.50
N = 2097152 pts
Blackman Window
←
Fo(0)=
−26.15
dBFS
−40
Noise
Noise(A)
Signal
−60
Amplitude [dBFS]
−80
↓
Integrated Noise =
−87.03
dBFS(A)
Spur =
−101.34
dBFS, SFDR = 75.19 dBc
↓
−100
←
Fo(1)=
−110.28
dBFS
−120
←
Fo(2)=
−116.40
dBFS
←
Fo(3)=
−120.45
dBFS
←
Fo(4)=
−125.03
dBFS
−140
−160
10 1
102
103
104
105
106
Frequency [Hz]
Figure 3. Noise vs. Frequency
Figure 4. THD, SINDA, and SNR vs. Input Amplitude
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