NEWPRODUCT PAM8901 / PAM8908

PAM8901 / PAM8908
25mW TRUE CAP FREE STEREO HEADPHONE AMPLIFIER
Pin Assignments
OUTL
HPVDD
16
15
14
13
INL-
1
12
PVDD
INL+
2
11
CAP+
INR+
3
10
CAP-
INR-
4
9
PGND
7
8
HPVSS
G0
6
OUTR
5
The PAM8901 / PAM8908 operates from a single supply from 2.5V to
5.5V, has short-circuit and over temperature protection. Shutdown
mode reduces supply current to less than 1µA.
G1
The PAM8901 / PAM8908 delivers up to 25mW per channel into a
16Ω load and has low 0.03% THD+N. A high power-supply rejection
ratio (80dB at 1kHz) allows this device to operate from noisy digital
supplies without an additional linear regulator.
SGND
(Top View)
Top View
U-QFN3030-16
U-QFN3030-16
(Type US)
SGND
PVDD
EN
14
13
INL-
1
12
HPVDD
INL+
2
11
CAP+
INR+
3
10
PGND
INR-
4
9
CAP-
5
6
7
8
U-QFN3030-16
U-QFN3030-16
(Type US)
Applications







Notes:
15
HPVSS










16
G1

Patent Pending 3 Phase Power Line Shift Charge Pump
Eliminates Need for DC-Blocking Capacitors
TrueCapFree Architecture, Output Biased at 0V (System
Ground)
Excellent Low Frequency Fidelity
80dB PSRR at 1kHz
Less than 1µA Shutdown Current
Support Both Fully Differential and Single-Ended Inputs
Short Circuit and Over Temperature Protection
Selectable Gain Settings: -6dB, 0dB, 3dB and 6dB
Available in Space Saving Packages: U-QFN3030-16 (Type US)
Lead Free and Green Devices Available (RoHS Compliant)
Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)
Halogen and Antimony Free. “Green Device (Note 3)
G0

OUTL
TopView)
View
(Top
Features
OUTR
NEW PRODUCT
The PAM8901 / PAM8908 stereo headphone driver is designed for
portable equipment where board space is at a premium. The
PAM8901 / PAM8908 uses a unique, patent pending architecture to
produce a ground-referenced output from a single supply, eliminating
the need for large DC-blocking capacitors, saving cost, board space,
and component height.
EN
Description
Smart Phones/Cellular Phones
Notebook Computers
Portable DVD Player
Personal Digital Assistants (PDAs)
Electronic Dictionaries
Digital Still Cameras
Portable Gaming
1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS) & 2011/65/EU (RoHS 2) compliant.
2. See http://www.diodes.com/quality/lead_free.html for more information about Diodes Incorporated’s definitions of Halogen- and Antimony-free, "Green"
and Lead-free.
3. Halogen- and Antimony-free "Green” products are defined as those which contain <900ppm bromine, <900ppm chlorine (<1500ppm total Br + Cl) and
<1000ppm antimony compounds.
PAM8901 / PAM8908
Document number: DS36456 Rev. 2 - 2
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PAM8901 / PAM8908
Typical Applications Circuit
Typical Application Configuration with Differential Input Signals
NEW PRODUCT
PAM8901/
PAM8908
Typical Application Configuration with Single-Ended Input Signal
PAM8901/
PAM8908
PAM8901 / PAM8908
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PAM8901 / PAM8908
Pin Descriptions
NEW PRODUCT
Pin Number
Pin Name
I/O/P
1
INL-
2
INL+
3
INR+
4
INR-
6
G0
PAM8901
PAM8908
1
2
3
4
5
6
7
7
G1
5
OUTR
I
I
I
I
I
I
O
8
8
HPVSS
P
9
10
11
12
13
14
15
16
10
9
11
14
12
16
15
13
PGND
CAPCAP+
PVDD
HPVDD
OUTL
SGND
EN
P
O
O
P
O
O
I
I
Function
Inverting left input for differential signals.
Non-inverting left input for differential signals.
Inverting right input for differential signals.
Non-inverting right input for differential signals.
Gain select bit 0
Gain select bit 1
Right headphone amplifier output. Connect to right terminal of headphone jack.
Charge pump output and negative power supply for output amplifiers; connect 1µF
capacitor to GND
Power Ground
Charge pump negative flying cap.
Charge pump positive flying cap.
Power VDD.
Positive power supply for headphone amplifiers. Charge pump positive half VDD output.
Left headphone amplifier output. Connect to left terminal of headphone jack.
Amplifier reference voltage.
Amplifier enabled. Connect to logic low to shutdown; connect to logic high to activate
Functional Block Diagram
PVDD
Supply
Control
HPVDD
INLINL+
Resistor
Array
PGND
-
OUTL
+
Short-Circuit
Protection
HPVSS
Thermal
Protection
HPVDD
INRINR+
Resistor
Array
-
OUTR
+
HPVSS
CAP+
G0
G1
On/Off
Pop Free
Gain
Select
3 Phase
Charge Pump
*Patent Pending
1uF
CAPHPVSS
1uF
SGND
PAM8901 / PAM8908
Document number: DS36456 Rev. 2 - 2
HPVDD
1uF
EN
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PAM8901 / PAM8908
Absolute Maximum Ratings (@TA = +25°C, unless otherwise specified.) (Note 4)
These are stress ratings only and functional operation is not implied. Exposure to absolute maximum ratings for prolonged time periods may
affect device reliability. All voltages are with respect to ground.
Parameter
Rating
Unit
6.0
V
Input Voltage (INR+, INR-, INL+, INL-)
HPVSS -0.3 to HPVDD +0.3
V
Control Interface Voltage (G0, G1, EN)
-0.3 to PVDD +0.3
V
-65 to +150
+150
+250, 10sec
°C
NEW PRODUCT
Supply Voltage (PVDD)
Storage Temperature
Maximum Junction Temperature
Soldering Temperature
Note:
4. Stresses greater than the 'Absolute Maximum Ratings' specified above may cause permanent damage to the device. These are stress ratings only;
functional operation of the device at these or any other conditions exceeding those indicated in this specification is not implied. Device reliability may be
affected by exposure to absolute maximum rating conditions for extended periods of time.
Recommended Operating Conditions (@TA = +25°C, unless otherwise specified.)
Symbol
Rating
Unit
Supply Voltage Range
2.5 to 5.5
V
TA
Ambient Temperature Range
-40 to +85
TJ
Junction Temperature Range
-40 to +125
VDD
Parameter
°C
Thermal Information (@TA = +25°C, unless otherwise specified.)
Symbol
Parameter
Package
Max
Unit
θJA
Thermal Resistance (Junction to Ambient)
U-QFN3030-16 (Type US)
35
°C/W
θJC
Thermal Resistance (Junction to Case)
U-QFN3030-16 (Type US)
14
°C/W
PAM8901 / PAM8908
Document number: DS36456 Rev. 2 - 2
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PAM8901 / PAM8908
Electrical Characteristics (@TA = +25°C, PVDD = 3.6V, RL = 16Ω, unless otherwise specified.)
Symbol
Test Conditions
Min
Typ
Max
Units
Supply Voltage
—
2.5
—
5.5
V
IQ
Quiescent Current
EN = PVDD, No Load
—
4
—
mA
THD = 1%, f = 1kHz, RL = 16Ω
35
—
mW
Output Power per Channel
—
PO
THD = 1%, f = 1kHz, RL = 32Ω
—
25
—
mW
ISD
Shutdown Current
EN = 0V, PVDD = 2.5V to 5.5V
—
0.1
1
µA
VIH
EN High Level Input Voltage
—
1.4
—
—
V
PVDD
NEW PRODUCT
Parameter
VIL
EN Low Level Voltage
—
—
—
0.6
V
VGH
G0, G1 High Level Input Voltage
—
1.4
—
—
V
VGL
G0, G1 Low Level Voltage
—
—
—
0.6
V
VOS
Output Offset Voltage
—
—
1
5
mV
G0 = 0V, G1 = 0V
—
-6
—
dB
G0 = PVDD, G1 = 0V
—
0
—
dB
G0 = 0V, G1 = PVDD
—
3
—
dB
AV
Closed-Loop Voltage Gain
G0 = PVDD, G1 = PVDD
—
6
—
dB
PSRR
Power Supply Rejection Ratio
Input A C-GND, f + 1kHz, VPP = 200mV
—
75
—
dB
THD+N
Total Harmonic Distortion Plus Noise
PO = 20mW, f = 1kHz
—
0.03
—
%
SNR
Signal to Noise Ratio
PO = 20mW, into 16Ω
—
100
—
dB
EN
Noise Output Voltage
A-Weighted
—
10
—
µVRMS
CS
Crosstalk
PO = 15mW, f = 1kHz
—
80
—
dB
fOSC
Charge Pump Switching Frequency
—
1.2
1.5
1.8
MHz
tON
Start-Up Time
EN from low to high
—
0.4
—
Ms
Thermal Shutdown
Threshold
—
+150
—
°C
Thermal Shutdown Hysteresis
Hysteresis
—
+20
—
°C
OTP
OTPH
PAM8901 / PAM8908
Document number: DS36456 Rev. 2 - 2
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PAM8901 / PAM8908
NEW PRODUCT
Typical Performance Characteristics (@TA = +25°C, PVDD = 3.6V, f = 1kHz, Gain = 6dB, unless otherwise specified.)
PAM8901 / PAM8908
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PAM8901 / PAM8908
NEW PRODUCT
Typical Performance Characteristics (Cont.) (@TA = +25°C, PVDD = 3.6V, f = 1kHz, Gain = 6dB, unless otherwise specified.)
PAM8901 / PAM8908
Document number: DS36456 Rev. 2 - 2
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PAM8901 / PAM8908
NEW PRODUCT
Typical Performance Characteristics (Cont.) (@TA = +25°C, CIN = 10µF, CO = 10µF, L = 4.7µH, unless otherwise specified.)
PAM8901 / PAM8908
Document number: DS36456 Rev. 2 - 2
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PAM8901 / PAM8908
Application Information
The basic PAM8901 / PAM8908 application circuit is shown in page 2.
Gain Control
NEW PRODUCT
The PAM8901 / PAM8908 has four gain settings which are controlled with pins G0 and G1. The following table gives an overview of the gain
function.
G0 Voltage
G1 Voltage
Amplifier Gain
≤0.6V
≤0.6V
-6dB
≥1.4V
≤0.6V
0dB
≤0.6V
≥1.4V
3dB
≥1.4V
≥1.4V
6dB
Input Coupling Capacitors
Input coupling capacitors block any DC bias from the audio source and ensure maximum dynamic range. Input coupling capacitors also minimize
PAM8901 / PAM8908 turn-on pop to an inaudible level. The input capacitors are in series with PAM8901 / PAM8908 internal input resistors,
creating a high-pass filter. The following Equation calculates the highpass filter corner frequency.
fC 
1
TT
2
RIN CIN
The input impedance, RIN, is dependent on device gain. Larger input capacitors decrease the corner frequency. See the following table for input
impedance values.
G0 Voltage
G1 Voltage
RIN
≤0.6V
≤0.6V
26.4kΩ
≥1.4V
≤0.6V
19.8kΩ
≤0.6V
≥1.4V
16.5kΩ
≥1.4V
≥1.4V
13.2kΩ
For a given high-pass cutoff frequency, the minimum input coupling capacitor is found as:
CIN 
1
TT
2
f C RIN
Example: Design for a 20Hz corner frequency with a PAM8901 / PAM8908 gain of +6dB. The input impedance table gives RIN as 13.2kΩ. The CIN
Equation shows the input coupling capacitors must be at least 0.6µF to achieve a 20Hz highpass corner frequency. Choose a 0.68µF standard
value capacitor for each PAM8901 / PAM8908 input (X5R material or better is required for best performance).
Charge Pump Flying Capacitor, HPVDD Capacitor and HPVSS Capacitor
The PAM8901 / PAM8908 uses a built-in charge pump to generate a positive and negative voltage supply for the headphone amplifiers. The
charge pump flying capacitor connects between CAP+ and CAP-. It transfers charge to generate the positive and negative supply voltage. The
HPVDD capacitor or HPVSS capacitor must be at least equal in or larger than value to the flying capacitor to allow maximum charge transfer. Use
low equivalent-series-resistance (ESR) ceramic capacitors (X5R material or better is required for best performance) to maximize charge pump
efficiency. Typical values are 1µF for the HPVDD, HPVSS and flying capacitors.
Power Supply Decoupling Capacitors
The PAM8901 / PAM8908 TrueCapFree headphone amplifier requires adequate power supply decoupling to ensure that output noise and total
harmonic distortion (THD) remain low. Use good low equivalent-series-resistance (ESR) ceramic capacitors (X5R material or better is required for
best performance). Place a 2.2µF capacitor within 5mm of the PVDD pin. Reducing the distance between the decoupling capacitor and PVDD
minimizes parasitic inductance and resistance, improving PAM8901 / PAM8908 supply rejection performance. Use 0402 or smaller size capacitors
if possible.
PAM8901 / PAM8908
Document number: DS36456 Rev. 2 - 2
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PAM8901 / PAM8908
Application Information (Cont.)
Power Supply Sequencing
Use input coupling capacitors to ensure inaudible turn-on pop. Activate the PAM8901 / PAM8908 after all audio sources have been activated and
their output voltages have settled. On powerdown, deactivate the PAM8901 / PAM8908 before deactivating the audio input source. The EN pin
controls device shutdown: Set to 0.6V or lower to deactivate the PAM8901 / PAM8908; set to 1.4V or higher to activate.
NEW PRODUCT
TrueCapFree Headphone Amplifiers
The TrueCapFree amplifier architecture operates from a single supply voltage and uses two internal charge pumps to generate a positive supply
and a rail for the headphone amplifier. The output voltages are centered around 0V and are capable of positive and negative voltage swings as
shown in the following drawing.
TrueCapFree amplifiers require no output DC-blocking capacitors. The headphone connector shield pin connects to ground and will interface with
headphones and non-headphone accessories. The PAM8901 / PAM8908 is a TrueCapFree amplifier.
LAYOUT RECOMMENDATIONS
Exposed Pad on PAM8901 / PAM8908
Solder the exposed metal pad on the PAM8901 / PAM8908 U-QFN3030-16 (Type US) package to the landing pad on the PCB. Connect the
landing pad to ground or leave it electrically unconnected (floating). Do not connect the landing pad to PVDD or to any other power supply voltage.
If the pad is grounded, it must be connected to the same ground as the PGND. Soldering the thermal pad is required for mechanical reliability and
enhances thermal conductivity of the package.
GND Connections
The SGND pin is an input reference and must be connected to the headphone ground connector pin. This ensures no turn-on pop and minimizes
output offset voltage. Do not connect more than ±0.3V to SGND.
PGND is a power ground. Connect supply decoupling capacitors for PVDD, HPVDD, and HPVSS to PGND.
Power Supply Connections
Connect the supply voltage to the PVDD pin and decouple it with an X5R or better capacitor. Place both PVDD capacitors within 5mm of PVDD
pin on the PAM8901 / PAM8908. Ensure that the ground connection of PVDD capacitor has a minimum length return path to the device. Failure to
properly decouple the PAM8901 / PAM8908 may degrade audio or EMC performance.
PAM8901 / PAM8908
Document number: DS36456 Rev. 2 - 2
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PAM8901 / PAM8908
Ordering Information
NEW PRODUCT
PAM8901/8 X X X
Package Type
Pin Configuration
Shipping Package
J: U-QFN3030-16
(Type US)
E: 16 pin
R: 7" Tape & Reel
Part Number
Package Type
Standard Package
PAM8901JER
PAM8908JER
U-QFN3030-16 (Type US)
U-QFN3030-16 (Type US)
3000 Units/ Tape & Reel
3000 Units/ Tape & Reel
Marking Information
(Top
Top View)
View
P8901
XXXYW
XXX : Internal Code
Y: Year
W: Weak
U-QFN3030-16
(Type US)
U-QFN3030-16
(Top
View)
Top View
P8908
XXXYW
XXX : Internal Code
Y: Year
W: Weak
U-QFN3030-16
(Type US)
U-QFN3030-16
PAM8901 / PAM8908
Document number: DS36456 Rev. 2 - 2
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PAM8901 / PAM8908
Package Outline Dimensions
Please see http://www.diodes.com/package-outlines.html for the latest version.
U-QFN3030-16 (Type US)
L
NEW PRODUCT
D
E
Pin #1 ID
(Laser Mark)
D2
E2
e
b
A3
A
e1
U-QFN3030-16
(Type US)
Dim Min Max Typ
A 0.500 0.600 0.550
A1 0.000 0.050 -A3
0.152 REF
b
0.200 0.300 0.250
D 2.950 3.050 3.000
D2 1.600 1.700 1.650
e
0.500 BSC
e1
1.500 REF
E 2.950 3.050 3.000
E2 1.600 1.700 1.650
L
0.350 0.450 0.400
All Dimensions in mm
Seating Plane
A1
Suggested Pad Layout
Please see http://www.diodes.com/package-outlines.html for the latest version.
U-QFN3030-16 (Type US)
X3
X1
Y2
Y1
X2
Dimensions Value (in mm)
C
0.500
X
0.350
X1
0.570
X2
1.800
X3
3.300
Y
0.570
Y1
1.800
Y2
3.300
Y
C
PAM8901 / PAM8908
Document number: DS36456 Rev. 2 - 2
X
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PAM8901 / PAM8908
IMPORTANT NOTICE
DIODES INCORPORATED MAKES NO WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, WITH REGARDS TO THIS DOCUMENT,
INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
(AND THEIR EQUIVALENTS UNDER THE LAWS OF ANY JURISDICTION).
NEW PRODUCT
Diodes Incorporated and its subsidiaries reserve the right to make modifications, enhancements, improvements, corrections or other changes
without further notice to this document and any product described herein. Diodes Incorporated does not assume any liability arising out of the
application or use of this document or any product described herein; neither does Diodes Incorporated convey any license under its patent or
trademark rights, nor the rights of others. Any Customer or user of this document or products described herein in such applications shall assume
all risks of such use and will agree to hold Diodes Incorporated and all the companies whose products are represented on Diodes Incorporated
website, harmless against all damages.
Diodes Incorporated does not warrant or accept any liability whatsoever in respect of any products purchased through unauthorized sales channel.
Should Customers purchase or use Diodes Incorporated products for any unintended or unauthorized application, Customers shall indemnify and
hold Diodes Incorporated and its representatives harmless against all claims, damages, expenses, and attorney fees arising out of, directly or
indirectly, any claim of personal injury or death associated with such unintended or unauthorized application.
Products described herein may be covered by one or more United States, international or foreign patents pending. Product names and markings
noted herein may also be covered by one or more United States, international or foreign trademarks.
This document is written in English but may be translated into multiple languages for reference. Only the English version of this document is the
final and determinative format released by Diodes Incorporated.
LIFE SUPPORT
Diodes Incorporated products are specifically not authorized for use as critical components in life support devices or systems without the express
written approval of the Chief Executive Officer of Diodes Incorporated. As used herein:
A. Life support devices or systems are devices or systems which:
1. are intended to implant into the body, or
2. support or sustain life and whose failure to perform when properly used in accordance with instructions for use provided in the
labeling can be reasonably expected to result in significant injury to the user.
B. A critical component is any component in a life support device or system whose failure to perform can be reasonably expected to cause the
failure of the life support device or to affect its safety or effectiveness.
Customers represent that they have all necessary expertise in the safety and regulatory ramifications of their life support devices or systems, and
acknowledge and agree that they are solely responsible for all legal, regulatory and safety-related requirements concerning their products and any
use of Diodes Incorporated products in such safety-critical, life support devices or systems, notwithstanding any devices- or systems-related
information or support that may be provided by Diodes Incorporated. Further, Customers must fully indemnify Diodes Incorporated and its
representatives against any damages arising out of the use of Diodes Incorporated products in such safety-critical, life support devices or systems.
Copyright © 2016, Diodes Incorporated
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