PAM8908JER [DIODES]
Audio Amplifier, 1 Func, PQCC16;
| 型号： | PAM8908JER |
| 厂家： | 
DIODES INCORPORATED |
| 描述： | Audio Amplifier, 1 Func, PQCC16 放大器 商用集成电路 |
| 文件： | 总13页 (文件大小：593K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
PAM8901 / PAM8908
25mW TRUE CAP FREE STEREO HEADPHONE AMPLIFIER
Description
Pin Assignments
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.
(Top View)
14
13
16
15
1
2
3
4
12
11
10
9
INL-
INL+
INR+
INR-
PVDD
CAP+
CAP-
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.
PGND
5
6
7
8
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.
U-QFN3030-16 (Type US)
(Top View)
Features
Patent Pending 3 Phase Power Line Shift Charge Pump
Eliminates Need for DC-Blocking Capacitors
TrueCapFree Architecture, Output Biased at 0V (System
Ground)
15
16
14
13
1
2
3
4
12
11
10
9
INL-
INL+
INR+
INR-
HPVDD
CAP+
PGND
CAP-
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)
5
6
7
8
U-QFN3030-16 (Type US)
Applications
Smart Phones/Cellular Phones
Notebook Computers
Portable DVD Player
Personal Digital Assistants (PDAs)
Electronic Dictionaries
Digital Still Cameras
Portable Gaming
Notes:
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.
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October 2016
© Diodes Incorporated
PAM8901 / PAM8908
Document number: DS36456 Rev. 2 - 2
PAM8901 / PAM8908
Typical Applications Circuit
Typical Application Configuration with Differential Input Signals
PAM8901/
PAM8908
Typical Application Configuration with Single-Ended Input Signal
PAM8901/
PAM8908
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© Diodes Incorporated
PAM8901 / PAM8908
Document number: DS36456 Rev. 2 - 2
PAM8901 / PAM8908
Pin Descriptions
Pin Number
Pin Name
I/O/P
Function
PAM8901 PAM8908
Inverting left input for differential signals.
1
2
3
4
5
6
7
1
2
3
4
6
7
5
INL-
INL+
INR+
INR-
G0
I
I
Non-inverting left input for differential signals.
Inverting right input for differential signals.
Non-inverting right input for differential signals.
Gain select bit 0
I
I
I
Gain select bit 1
G1
I
Right headphone amplifier output. Connect to right terminal of headphone jack.
OUTR
O
Charge pump output and negative power supply for output amplifiers; connect 1µF
capacitor to GND
8
8
HPVSS
P
Power Ground
9
10
9
PGND
CAP-
P
O
O
P
O
O
I
Charge pump negative flying cap.
Charge pump positive flying cap.
10
11
12
13
14
15
16
11
14
12
16
15
13
CAP+
PVDD
HPVDD
OUTL
SGND
EN
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
I
Functional Block Diagram
PVDD
Supply
Control
HPVDD
PGND
INL-
-
Resistor
Array
OUTL
INL+
+
Short-Circuit
Protection
HPVSS
Thermal
Protection
HPVDD
INR-
-
Resistor
Array
OUTR
INR+
+
HPVSS
CAP+
1uF
CAP-
3 Phase
Charge Pump
*Patent Pending
G0
G1
On/Off
Pop Free
Gain
Select
HPVDD
1uF
HPVSS
1uF
SGND EN
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October 2016
© Diodes Incorporated
PAM8901 / PAM8908
Document number: DS36456 Rev. 2 - 2
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
V
6.0
Supply Voltage (PVDD
)
Input Voltage (INR+, INR-, INL+, INL-)
Control Interface Voltage (G0, G1, EN)
Storage Temperature
V
HPVSS -0.3 to HPVDD +0.3
-0.3 to PVDD +0.3
-65 to +150
V
Maximum Junction Temperature
Soldering Temperature
+150
°C
+250, 10sec
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
VDD
TA
Parameter
Supply Voltage Range
Rating
2.5 to 5.5
-40 to +85
-40 to +125
Unit
V
Ambient Temperature Range
Junction Temperature Range
°C
TJ
Thermal Information (@TA = +25°C, unless otherwise specified.)
Symbol
θJA
Parameter
Package
Max
35
Unit
°C/W
°C/W
Thermal Resistance (Junction to Ambient)
Thermal Resistance (Junction to Case)
U-QFN3030-16 (Type US)
U-QFN3030-16 (Type US)
14
θJC
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© Diodes Incorporated
PAM8901 / PAM8908
Document number: DS36456 Rev. 2 - 2
PAM8901 / PAM8908
Electrical Characteristics (@TA = +25°C, PVDD = 3.6V, RL = 16Ω, unless otherwise specified.)
Symbol
PVDD
IQ
Parameter
Supply Voltage
Test Conditions
Min
2.5
—
—
—
—
1.4
—
1.4
—
—
—
—
—
—
—
—
—
—
—
1.2
—
—
—
Typ
—
Max
5.5
—
—
—
1
Units
V
—
Quiescent Current
4
mA
mW
mW
µA
V
EN = PVDD, No Load
35
25
0.1
—
THD = 1%, f = 1kHz, RL = 16Ω
Output Power per Channel
PO
THD = 1%, f = 1kHz, RL = 32Ω
Shutdown Current
ISD
VIH
EN = 0V, PVDD = 2.5V to 5.5V
EN High Level Input Voltage
EN Low Level Voltage
—
—
0.6
—
0.6
5
—
—
V
VIL
G0, G1 High Level Input Voltage
G0, G1 Low Level Voltage
Output Offset Voltage
—
—
V
VGH
VGL
VOS
—
—
V
—
1
mV
dB
dB
dB
dB
dB
%
G0 = 0V, G1 = 0V
G0 = PVDD, G1 = 0V
G0 = 0V, G1 = PVDD
G0 = PVDD, G1 = PVDD
Input A C-GND, f + 1kHz, VPP = 200mV
PO = 20mW, f = 1kHz
PO = 20mW, into 16Ω
A-Weighted
-6
—
—
—
—
—
—
—
—
—
1.8
—
—
—
0
AV
Closed-Loop Voltage Gain
3
6
PSRR
THD+N
SNR
EN
Power Supply Rejection Ratio
Total Harmonic Distortion Plus Noise
Signal to Noise Ratio
75
0.03
100
10
80
1.5
0.4
+150
+20
dB
µV RMS
dB
MHz
Ms
°C
Noise Output Voltage
CS
Crosstalk
PO = 15mW, f = 1kHz
—
Charge Pump Switching Frequency
Start-Up Time
fOSC
EN from low to high
Threshold
tON
OTP
OTPH
Thermal Shutdown
Thermal Shutdown Hysteresis
Hysteresis
°C
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© Diodes Incorporated
PAM8901 / PAM8908
Document number: DS36456 Rev. 2 - 2
PAM8901 / PAM8908
Typical Performance Characteristics (@TA = +25°C, PVDD = 3.6V, f = 1kHz, Gain = 6dB, unless otherwise specified.)
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© Diodes Incorporated
PAM8901 / PAM8908
Document number: DS36456 Rev. 2 - 2
PAM8901 / PAM8908
Typical Performance Characteristics (Cont.) (@TA = +25°C, PVDD = 3.6V, f = 1kHz, Gain = 6dB, unless otherwise specified.)
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© Diodes Incorporated
PAM8901 / PAM8908
Document number: DS36456 Rev. 2 - 2
PAM8901 / PAM8908
Typical Performance Characteristics (Cont.) (@TA = +25°C, CIN = 10µF, CO = 10µF, L = 4.7µH, unless otherwise specified.)
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PAM8901 / PAM8908
Document number: DS36456 Rev. 2 - 2
PAM8901 / PAM8908
Application Information
The basic PAM8901 / PAM8908 application circuit is shown in page 2.
Gain Control
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
≤0.6V
G1 Voltage
≤0.6V
Amplifier Gain
-6dB
0dB
3dB
6dB
≥1.4V
≤0.6V
≤0.6V
≥1.4V
≥1.4V
≥1.4V
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.
1
fC
2TTRIN C
IN
The input impedance, RIN, is dependent on device gain. Larger input capacitors decrease the corner frequency. See the following table for input
impedance values.
RIN
G0 Voltage
≤0.6V
G1 Voltage
≤0.6V
26.4kΩ
19.8kΩ
16.5kΩ
13.2kΩ
≥1.4V
≤0.6V
≤0.6V
≥1.4V
≥1.4V
≥1.4V
For a given high-pass cutoff frequency, the minimum input coupling capacitor is found as:
1
IN
C
2TT fCRIN
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.
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© Diodes Incorporated
PAM8901 / PAM8908
Document number: DS36456 Rev. 2 - 2
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.
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.
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© Diodes Incorporated
PAM8901 / PAM8908
Document number: DS36456 Rev. 2 - 2
PAM8901 / PAM8908
Ordering Information
PAM8901/8 X X X
Package Type
Pin Configuration
Shipping Package
R: 7" Tape & Reel
E: 16 pin
J: U-QFN3030-16
(Type US)
Part Number
PAM8901JER
PAM8908JER
Package Type
Standard Package
U-QFN3030-16 (Type US)
U-QFN3030-16 (Type US)
3000 Units/ Tape & Reel
3000 Units/ Tape & Reel
Marking Information
(Top View)
XXX : Internal Code
Y: Year
W: Weak
P8901
XXXYW
U-QFN3030-16 (Type US)
(Top View)
XXX : Internal Code
Y: Year
W: Weak
P8908
XXXYW
U-QFN3030-16 (Type US)
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© Diodes Incorporated
PAM8901 / PAM8908
Document number: DS36456 Rev. 2 - 2
PAM8901 / PAM8908
Package Outline Dimensions
Please see http://www.diodes.com/package-outlines.html for the latest version.
U-QFN3030-16 (Type US)
L
D
D2
U-QFN3030-16
(Type US)
Dim Min Max Typ
A
0.500 0.600 0.550
A1 0.000 0.050 --
A3
b
D
0.152 REF
0.200 0.300 0.250
2.950 3.050 3.000
E
A
E2
Pin #1 ID
(
Laser Mark)
e
D2 1.600 1.700 1.650
e
e1
E
0.500 BSC
1.500 REF
2.950 3.050 3.000
b
E2 1.600 1.700 1.650
0.350 0.450 0.400
A3
L
e1
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
Dimensions Value (in mm)
C
X
X1
X2
X3
Y
0.500
0.350
0.570
1.800
3.300
0.570
1.800
3.300
Y2
Y1
X2
Y1
Y2
Y
C
X
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© Diodes Incorporated
PAM8901 / PAM8908
Document number: DS36456 Rev. 2 - 2
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).
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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© Diodes Incorporated
PAM8901 / PAM8908
Document number: DS36456 Rev. 2 - 2
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