G1420? [ETC]
2-W stereo audio power OP amp.|OP Amplifier Series ; 2 -W立体声音频功率运算放大器。| OP放大器系列\n
| 型号： | G1420? |
| 厂家： | 
ETC |
| 描述： | 2-W stereo audio power OP amp.|OP Amplifier Series
|
| 文件： | 总26页 (文件大小：488K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
Global Mixed-mode Technology Inc.
2W Stereo Audio Amplifier
General Description
G1420
Features
ꢀDepop Circuitry Integrated
ꢀOutput Power at 1% THD+N, VDD=5V
--1.8W/CH (typical) into a 4Ω Load
--1.2W/CH (typical) into a 8Ω Load
ꢀBridge-Tied Load (BTL), Single-Ended (SE)
ꢀStereo Input MUX
G1420 is a stereo audio power amplifier in 24pin
TSSOP thermal pad package. It can drive 1.8W con-
tinuous RMS power into 4 load per channel in
Ω
Bridge-Tied Load (BTL) mode at 5V supply voltage. Its
THD is smaller than 1% under the above operation
condition. To simplify the audio system design in the
notebook application, G1420 supports the Bridge-Tied
Load (BTL) mode for driving the speakers, Single-End
(SE) mode for driving the headphone. G1420 can
mute the output when Mute-In is activated. For the low
current consumption applications, the SHDN mode is
supported to disable G1420 when it is idle. The cur-
rent consumption can be further reduced to below
5µA.
ꢀMute and Shutdown Control Available
ꢀSurface-Mount Power Package
24-Pin TSSOP-P
Applications
ꢀStereo Power Amplifiers for Notebooks or
Desktop Computers
ꢀMultimedia Monitors
G1420 also supports two input paths, that means two
different gain loops can be set in the same PCB and
choosing either one by setting HP/LINE pin. It en-
hances the hardware designing flexibility.
ꢀStereo Power Amplifiers for Portable Audio
Systems
Ordering Information
ORDER
TEMP.
PACKAGE PACKING
NUMBER
RANGE
G1420F31U -40°C to +85°C TSSOP-24L Tape & Reel
G1420F31T -40°C to +85°C TSSOP-24L
Tube
Pin Configuration
G1420
GND/HS
NC
22 ROUT+
RLINEIN
20 RHPIN
19 RBYPASS
GND/HS
24
23
1
TJ
LOUT+
LLINEIN
2
3
4
5
6
7
8
9
21
LHPIN
LBYPASS
LVDD
SHUTDOWN
MUTE OUT
LOUT-
Thermal
Pad
18
17
16
RVDD
NC
HP/LINE
10
15 ROUT-
14 SE/BTL
MUTE IN 11
14
12
13
GND/HS
GND/HS
Top View
24Pin TSSOP
Bottom View
TEL: 886-3-5788833
http://www.gmt.com.tw
Ver: 1.1
May 23, 2003
1
Global Mixed-mode Technology Inc.
G1420
Absolute Maximum Ratings
Supply Voltage, VCC…………………..…...…….……...6V
Operating Ambient Temperature Range
Power Dissipation (1)
TA ≤ 25°C…………………………………………..2.7W
TA ≤ 70°C…………………………………………..1.7W
TA ≤ 85°C………………….……………………….1.4W
Electrostatic Discharge, VESD
TA…….…………………………….……….-40°C to +85°C
Maximum Junction Temperature, TJ…..……….….150°C
Storage Temperature Range, TSTG….….-65°C to+150°C
Soldering Temperature, 10seconds, TS……….……260°C
Human body mode..……………………...-3000 to 3000(2)
Note:
(1) : Recommended PCB Layout
(2) : Human body model : C = 100pF, R = 1500Ω, 3 positive pulses plus 3 negative pulses
Electrical Characteristics
DC Electrical Characteristics, TA=+25°C
PARAMETER
SYMBOL
CONDITIONS
Stereo BTL
MIN TYP MAX UNIT
7
3.5
8
4
5
8
4
2
9
VDD =3.3V
DD = 5V
STEREO SE
Stereo BTL
STEREO SE
5.6
11
6.5
30
11
6.5
5
Supply Current
IDD
V
DC Differential Output Voltage
Supply Current in Mute Mode
VO(DIFF)
IDD(MUTE)
ISD
VDD = 5V,Gain = 2
mV
mA
µA
Stereo BTL
STEREO SE
VDD = 5V
IDD in Shutdown
VDD = 5V
(AC Operation Characteristics, VDD = 5.0V, TA=+25°C, RL = 4Ω, unless otherwise noted)
PARAMETER
SYMBOL
CONDITIONS
THD = 1%, BTL, RL = 4Ω
THD = 1%, BTL, RL = 8Ω
THD = 10%, BTL, RL = 4Ω
THD = 10%, BTL, RL = 8Ω
THD = 1%, SE, RL = 4Ω
THD = 1%, SE, RL = 8Ω
THD = 10%, SE, RL = 4Ω
THD = 10%, SE, RL L = 8Ω
THD = 0.5%, SE, RL = 32Ω
PO = 1.6W, BTL, RL = 4Ω
PO = 1W, BTL, RL = 8Ω
PO = 75mW, SE, RL = 32Ω
VI = 1V, RL = 10KΩ, G = 1
G = 1, THD = 1%
MIN TYP MAX UNIT
1.8
1.12
2
W
1.4
500
320
Output power (each channel) see Note
P(OUT)
mW
m%
650
400
90
500
150
20
10
20
60
75
85
82
80
85
2
Total harmonic distortion plus noise
THD+N
Maximum output power bandwidth
Phase margin
Power supply ripple rejection
Mute attenuation
Channel-to-channel output separation
Line/HP input separation
BTL attenuation in SE mode
Input impedance
BOM
kHz
°
dB
dB
dB
dB
dB
MΩ
dB
µV (rms)
RL = 4Ω, Open Load
f = 120Hz
RSRR
f = 1kHz
ZI
Signal-to-noise ratio
Output noise voltage
PO = 500mW, BTL
Output noise voltage
90
55
Vn
Note :Output power is measured at the output terminals of the IC at 1kHz.
TEL: 886-3-5788833
http://www.gmt.com.tw
Ver: 1.1
May 23, 2003
2
Global Mixed-mode Technology Inc.
G1420
(AC Operation Characteristics, VDD = 3.3V, TA=+25°C, RL = 4Ω, unless otherwise noted)
PARAMETER
SYMBOL
CONDITIONS
THD = 1%, BTL, RL = 4Ω
THD = 1%, BTL, RL = 8Ω
THD = 10%, BTL, RL = 4Ω
THD = 10%, BTL, RL = 8Ω
THD = 1%, SE, RL = 4Ω
THD = 1%, SE, RL = 8Ω
THD = 10%, SE, RL = 4Ω
THD = 10%, SE, RL L = 8Ω
THD = 0.5%, SE, RL = 32Ω
PO = 1.6W, BTL, RL = 4Ω
PO = 1W, BTL, RL = 8Ω
PO = 75mW, SE, RL = 32Ω
VI = 1V, RL = 10KΩ, G = 1
G = 1, THD 1%
MIN TYP MAX UNIT
0.8
0.5
W
1
0.6
230
140
Output power (each channel) see Note
P(OUT)
mW
290
180
43
270
100
20
10
20
60
75
85
80
80
85
2
Total harmonic distortion plus noise
THD+N
m%
Maximum output power bandwidth
Phase margin
Power supply ripple rejection
Mute attenuation
BOM
kHz
°
RL = 4Ω, Open Load
PSRR
f = 120Hz
dB
dB
Channel-to-channel output separation
Line/HP input separation
BTL attenuation in SE mode
Input impedance
f = 1kHz
dB
dB
dB
ZI
MΩ
dB
Signal-to-noise ratio
PO = 500mW, BTL
90
55
Output noise voltage
Vn
Output noise voltage
µV (rms)
Note :Output power is measured at the output terminals of the IC at 1kHz.
TEL: 886-3-5788833
http://www.gmt.com.tw
Ver: 1.1
May 23, 2003
3
Global Mixed-mode Technology Inc.
G1420
Pin Description
PIN
1,12,13,24
2
NAME
GND/HS
TJ
I/O
FUNCTION
Ground connection for circuitry, directly connected to thermal pad.
O
Source a current inversely to the junction temperature. This pin should be left uncon-
nected during normal operation. For more information, see the junction temperature
measurement section of this document.
3
4
5
LOUT+
LLINE IN
LHP IN
O
I
I
Left channel + output in BTL mode, + output in SE mode.
Left channel line input, selected when HP/ pin is held low.
Left channel headphone input, selected when HP/pin is held high.
6
7
8
LBYPASS
LVDD
SHUTDOWN
Connect to voltage divider for left channel internal mid-supply bias.
Supply voltage input for left channel and for primary bias circuits.
I
I
Shutdown mode control signal input, places entire IC in shutdown mode when held high,
I
DD = 5µA.
9
MUTE OUT
LOUT-
MUTE IN
SE/BTL
ROUT-
O
O
I
I
O
I
Follows MUTE IN pin, provides buffered output.
10
11
14
15
16
Left channel - output in BTL mode, high impedance state in SE mode.
Mute control signal input, hold low for normal operation, hold high to mute.
Mode control signal input, hold low for BTL mode, hold high for SE mode.
Right channel - output in BTL mode, high impedance state in SE mode.
MUX control input, hold high to select headphone inputs (5,20), hold low to select line
inputs (4,21).
HP/LINE
17,23
18
NC
RVDD
I
Supply voltage input for right channel.
19
20
21
22
RBYPASS
RHP IN
RLINE IN
ROUT+
Connect to voltage divider for right channel internal mid-supply bias.
Right channel headphone input, selected when HP/pin is held high.
Right channel line input, selected when HP/pin is held low.
Right channel + output in BTL mode, + output in SE mode.
I
I
O
TEL: 886-3-5788833
http://www.gmt.com.tw
Ver: 1.1
May 23, 2003
4
Global Mixed-mode Technology Inc.
G1420
Typical Characteristics
Table of Graphs
FIGURE
vs Frequency
2,4,5,7,8,11,12,14,15,17,18,20,21,23,24,26,27,29,30,32,33
THD +N Total harmonic distortion plus noise
vs Output power
vs Frequency
1,3,6,9,10,13,16,19,22,25,28,31
Vn
34,35
Output noise voltage
Supply ripple rejection ratio
Crosstalk
vs Frequency
36,37
vs Frequency
38,39,40,41
42,43,44,45
46
vs Frequency
Closed loop response
IDD
PO
vs supply voltage
vs supply voltage
vs Load resistance
vs Output power
Supply ripple rejection ratio
47,48
Output power
49,50
51,52,53,54
PD
Power dissipation
TOTAL HARMONIC DISTORTION PLUS NOISE
vs OUTPUT POWER
TOTAL HARMONIC DISTORTION PLUS NOISE
vs OUTPUT FREQUENCY
10
5
10
5
20kHz
2
2
1
1
Po=1.8W
0.5
1kHz
0.5
%
%
0.2
0.1
0.2
0.1
VDD=5V
RL=3Ω
BTL
Po=1.5W
20 Hz
VDD=5V
RL=3Ω
BTL
0.05
0.05
Av=-2V/V
0.02
0.01
0.02
0.01
3m
5m
10m
20m
50m
100m
W
200m
500m
1
2
3
20
50
100
200
500
Hz
1k
2k
5k
10k 20k
Figure 1
Figure 2
Ver: 1.1
May 23, 2003
TEL: 886-3-5788833
http://www.gmt.com.tw
5
Global Mixed-mode Technology Inc.
G1420
TOTAL HARMONIC DISTORTION PLUS NOISE
vs OUTPUT POWER
TOTAL HARMONIC DISTORTION PLUS NOISE
vs OUTPUT FREQUENCY
10
5
10
5
Av=-4V/V
20kHz
2
2
1
1
Av=-2V/V
0.5
0.5
1kHz
%
%
0.2
0.1
0.2
0.1
VDD=5V
RL=4Ω
BTL
Av=-1V/V
VDD=5V
RL=4Ω
BTL
20 Hz
0.05
0.05
Po=1.5W
0.02
0.01
0.02
0.01
3m
5m
10m
20m
50m
100m
W
200m
500m
1
2
3
20
50
100
200
500
Hz
1k
2k
5k
10k 20k
Figure 3
Figure 4
TOTAL HARMONIC DISTORTION PLUS NOISE
vs OUTPUT FREQUENCY
TOTAL HARMONIC DISTORTION PLUS NOISE
vs OUTPUT POWER
10
10
VDD=5V
VDD=5V
5
5
RL=8Ω
RL=4Ω
20kHz
Po=1.5W
BTL
Av=-2V/V
BTL
Av=-2V/V
2
2
1
1
Po=0.25W
0.5
0.5
%
%
0.2
0.1
0.2
0.1
1kHz
Po=0.75W
0.05
0.05
20Hz
0.02
0.01
0.02
0.01
20
50
100
200
500
Hz
1k
2k
5k
10k 20k
3m
5m
10m
20m
50m
100m
W
200m
500m
1
2
3
Figure 5
Figure 6
Ver: 1.1
TEL: 886-3-5788833
http://www.gmt.com.tw
May 23, 2003
6
Global Mixed-mode Technology Inc.
G1420
TOTAL HARMONIC DISTORTION PLUS NOISE
vs OUTPUT FREQUENCY
TOTAL HARMONIC DISTORTION PLUS NOISE
vs OUTPUT FREQUENCY
10
10
5
5
VDD=5V
VDD=5V
RL=8Ω
RL=8Ω
2
1
Po=1W
2
Av=-4V/V
BTL
Av=-2V/V
BTL
Po=1W
1
Po=0.25W
0.5
0.5
%
Av=-2V/V
%
0.2
0.1
0.2
0.1
Po=0.5W
0.05
0.05
Av=-1V/V
0.02
0.01
0.02
0.01
20
50
100
200
500
Hz
1k
2k
5k
10k 20k
20
50
100
200
500
Hz
1k
2k
5k
10k 20k
Figure 8
Figure 7
TOTAL HARMONIC DISTORTION PLUS NOISE
vs OUTPUT POWER
TOTAL HARMONIC DISTORTION PLUS NOISE
vs OUTPUT POWER
10
10
5
5
20kHz
20kHz
2
1
2
1
1kHz
1kHz
0.5
0.5
%
%
0.2
0.1
0.2
0.1
VDD=3.3V
RL=3Ω
BTL
VDD=3.3V
RL=4Ω
BTL
20Hz
0.05
0.05
20Hz
0.02
0.01
0.02
0.01
1m
2m
5m
10m
20m
50m
100m
200m
500m
1
1m
2m
5m
10m
20m
50m
100m
200m
500m
1
W
W
Figure 9
Figure 10
Ver: 1.1
May 23, 2003
TEL: 886-3-5788833
http://www.gmt.com.tw
7
Global Mixed-mode Technology Inc.
G1420
TOTAL HARMONIC DISTORTION PLUS NOISE
vs OUTPUT FREQUENCY
TOTAL HARMONIC DISTORTION PLUS NOISE
vs OUTPUT FREQUENCY
10
10
5
5
VDD=3.3V
RL=4Ω
BTL
VDD=3.3V
RL=4Ω
BTL
Av=-4V/V
2
1
2
1
Po=0.7W
Av=-2V/V
Av=-2V/V
Po=0.65W
0.5
0.5
%
%
Po=0.1W
0.2
0.1
0.2
0.1
Po=0.35W
Av=-1V/V
0.05
0.05
0.02
0.01
0.02
0.01
20
50
100
200
500
Hz
1k
2k
5k
10k
20k
20
50
100
200
500
Hz
1k
2k
5k
10k
20k
Figure 11
Figure 12
TOTAL HARMONIC DISTORTION PLUS NOISE
vs OUTPUT POWER
TOTAL HARMONIC DISTORTION PLUS NOISE
vs OUTPUT FREQUENCY
10
10
VDD=3.3V
5
5
VDD=3.3V
RL=8Ω
RL=8Ω
20kHz
2
2
BTL
Av=-4V/V
BTL
Po=0.4W
1
1
0.5
0.5
Av=-2V/V
%
%
1kHz
0.2
0.1
0.2
0.1
0.05
0.05
Av=-1V/V
20Hz
0.02
0.01
0.02
0.01
1m
2m
5m
10m
20m
50m
100m
200m
500m
1
20
50
100
200
500
Hz
1k
2k
5k
10k 20k
W
Figure 13
Figure 14
Ver: 1.1
May 23, 2003
TEL: 886-3-5788833
http://www.gmt.com.tw
8
Global Mixed-mode Technology Inc.
G1420
TOTAL HARMONIC DISTORTION PLUS NOISE
vs OUTPUT FREQUENCY
TOTAL HARMONIC DISTORTION PLUS NOISE
vs OUTPUT POWER
10
10
VDD=5V
VDD=3.3V
5
5
RL=4Ω
RL=8Ω
2
2
1
SE
BTL
Av=-2V/V
Po=0.4W
1
20kHz
0.5
0.5
%
%
Po=0.1W
0.2
0.1
0.2
0.1
1kHz
0.05
0.05
Po=0.25W
100Hz
0.02
0.01
0.02
0.01
20
50
100
200
500
Hz
1k
2k
5k
10k 20k
1m
2m
5m
10m
20m
50m
100m
200m
500m
1
W
Figure 15
Figure 16
TOTAL HARMONIC DISTORTION PLUS NOISE
vs OUTPUT FREQUENCY
TOTAL HARMONIC DISTORTION PLUS NOISE
vs OUTPUT FREQUENCY
10
10
VDD=5V
5
5
VDD=5V
RL=4Ω
RL=4Ω
2
2
Av=-4V/V
SE
Po=0.5W
SE
Av=-2V/V
Po=0.4W
1
1
0.5
0.5
%
%
Av=-2V/V
0.2
0.1
0.2
0.1
Po=0.1W
0.05
0.05
Av=-1V/V
Po=0.25W
0.02
0.01
0.02
0.01
20
50
100
200
500
Hz
1k
2k
5k
10k 20k
20
50
100
200
500
Hz
1k
2k
5k
10k 20k
Figure 18
Figure 17
Ver: 1.1
May 23, 2003
TEL: 886-3-5788833
http://www.gmt.com.tw
9
Global Mixed-mode Technology Inc.
G1420
TOTAL HARMONIC DISTORTION PLUS NOISE
vs OUTPUT POWER
TOTAL HARMONIC DISTORTION PLUS NOISE
vs OUTPUT FREQUENCY
10
10
VDD=5V
5
5
VDD=5V
RL=8Ω
RL=8Ω
2
2
SE
SE
Po=0.25W
1
1
20kHz
0.5
0.5
Av=-2V/V
%
%
0.2
0.1
0.2
0.1
Av=-4V/V
1kHz
0.05
0.05
100Hz
0.02
0.01
0.02
0.01
Av=-1V/V
20
50
100
200
500
Hz
1k
2k
5k
10k 20k
1m
2m
5m
10m
20m
50m
100m
200m
500m
1
W
Figure 19
Figure 20
TOTAL HARMONIC DISTORTION PLUS NOISE
vs OUTPUT FREQUENCY
TOTAL HARMONIC DISTORTION PLUS NOISE
vs OUTPUT POWER
10
10
5
5
VDD=5V
VDD=5V
2
RL=8Ω
RL=32Ω
2
SE
Av=-2
1
SE
0.5
1
20kHz
1kHz
0.2
0.1
0.5
Po=0.05W
%
%
0.2
0.1
0.05
20Hz
0.02
0.01
Po=0.1W
0.05
0.005
Po=0.25W
0.02
0.01
0.002
0.001
20
50
100
200
500
Hz
1k
2k
5k
10k 20k
1m
2m
5m
10m
20m
50m
100m 200m
W
Figure 21
Figure 22
Ver: 1.1
TEL: 886-3-5788833
http://www.gmt.com.tw
May 23, 2003
10
Global Mixed-mode Technology Inc.
G1420
TOTAL HARMONIC DISTORTION PLUS NOISE
vs OUTPUT FREQUENCY
TOTAL HARMONIC DISTORTION PLUS NOISE
vs OUTPUT FREQUENCY
10
10
5
5
VDD=5V
VDD=5V
2
RL=32Ω
2
RL=32Ω
1
1
SE
Po=75mW
SE
0.5
0.5
Av=-4V/V
Po=25mW
0.2
0.2
0.1
0.1
%
%
Av=-2V/V
0.05
0.05
Po=50mW
0.02
0.01
0.02
0.01
0.005
0.005
Av=-1V/V
Po=75mW
0.002
0.001
0.002
0.001
20
50
100
200
500
Hz
1k
2k
5k
10k 20k
20
50
100
200
500
Hz
1k
2k
5k
10k 20k
Figure 23
Figure 24
TOTAL HARMONIC DISTORTION PLUS NOISE
vs OUTPUT POWER
TOTAL HARMONIC DISTORTION PLUS NOISE
vs OUTPUT FREQUENCY
10
10
VDD=3.3V
5
5
VDD=3.3V
RL=4Ω,SE
RL=4Ω
Av=-2
2
2
SE
Po=0.2W
20kHz
Av=-4V/V
1
1
0.5
0.5
%
%
Av=-2V/V
0.2
0.1
0.2
1kHz
0.1
0.05
0.05
100Hz
0.02
0.01
0.02
Av=-1V/V
0.01
20
50
100
200
500
Hz
1k
2k
5k
10k 20k
1m
2m
5m
10m
20m
50m
100m
200m
500m
1
W
Figure 25
Figure 26
Ver: 1.1
May 23, 2003
TEL: 886-3-5788833
http://www.gmt.com.tw
11
Global Mixed-mode Technology Inc.
G1420
TOTAL HARMONIC DISTORTION PLUS NOISE
vs OUTPUT FREQUENCY
TOTAL HARMONIC DISTORTION PLUS NOISE
vs OUTPUT POWER
ꢀꢀ
10ꢀꢀ
ꢀꢀ
ꢀꢀ
10
5
VDD=3.3V
5
VDD=3.3V
RL=4Ω
SE
RL=8Ω,SE
2
1
2
Av=-2
Po=50mW
Av=-2
1
20kHz
0.5
0.5
%
%
0.2
0.1
0.2
0.1
Po=100mW
1kHz
0.05
0.05
0.02
0.01
0.02
0.01
Po=150mW
100Hz
20
50
100
200
500
Hz
1k
2k
5k
10k 20k
1m
2m
5m
10m
W
20m
50m
100m 200m
Figure 27
Figure 28
TOTAL HARMONIC DISTORTION PLUS NOISE
vs OUTPUT FREQUENCY
TOTAL HARMONIC DISTORTION PLUS NOISE
vs OUTPUT FREQUENCY
10
10
5
5
VDD=3.3V
VDD=3.3V
RL=8Ω
RL=8Ω
2
2
SE
SE
Po=100mW
1
1
Av=-4V/V
Av=-1V/V
Po=25mW
0.5
0.5
%
%
0.2
0.1
0.2
0.1
Po=50mW
Av=-2V/V
0.05
0.05
0.02
0.01
0.02
0.01
Po=100mW
20
50
100
200
500
Hz
1k
2k
5k
10k 20k
20
50
100
200
500
Hz
1k
2k
5k
10k 20k
Figure 29
Figure 30
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May 23, 2003
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Global Mixed-mode Technology Inc.
G1420
TOTAL HARMONIC DISTORTION PLUS NOISE
vs OUTPUT POWER
TOTAL HARMONIC DISTORTION PLUS NOISE
vs OUTPUT FREQUENCY
10
10
5
5
VDD=3.3V
VDD=3.3V
2
RL=32Ω
RL=32Ω
2
1kHz
1
SE
Po=30mW
SE
Av=-4V/V
0.5
1
0.2
0.5
Av=-2V/V
0.1
%
%
0.2
0.1
0.05
0.02
0.01
20Hz
0.05
0.005
Av=-1V/V
0.02
0.01
0.002
0.001
20
50
100
200
500
Hz
1k
2k
5k
10k 20k
1m
2m
5m
10m
W
20m
50m
100m
Figure 31
Figure 32
TOTAL HARMONIC DISTORTION PLUS NOISE
vs OUTPUT FREQUENCY
OUTPUT NOISE VOLTAGE
vs FREQUENCY
10
100u
90u
80u
5
VDD=5V
RL=4Ω
VDD=3.3V
BW=22Hz to 20kHz
70u
60u
2
RL=32Ω
1
SE
50u
40u
0.5
Po=10m
0.2
Vo BTL
0.1
%
V
30u
20u
0.05
Po=20mW
0.02
0.01
Vo SE
0.005
Po=30mW
0.002
0.001
10u
20
50
100
200
500
Hz
1k
2k
5k
10k 20k
20
50
100
200
500
Hz
1k
2k
5k
10k 20k
Figure 33
Figure 34
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Global Mixed-mode Technology Inc.
G1420
OUTPUT NOISE VOLTAGE
vs FREQUENCY
SUPPLY RIPPLE REJECTION RATIO
vs FREQUENCY
100u
90u
80u
+0
ꢁꢁ
ꢁꢁ
VDD=3.3V
RL=4Ω
-10
-20
-30
-40
-50
-60
-70
-80
-90
BW=22Hz to 20kHz
Vo BTL
70u
VDD=5V
RL=4Ω
CB=4.7uF
60u
50u
40u
d
B
V
30u
BTL
20u
Vo SE
SE
10u
-100
20
50
100
200
500
Hz
1k
2k
5k
10k
20k
20
50
100
200
500
Hz
1k
2k
5k
10k
20k
Figure 35
Figure 36
SUPPLY RIPPLE REJECTION RATIO
vs FREQUENCY
CROSSTALK vs FREQUENCY
-20
-25
+0
ꢁꢁ
ꢁꢁ
-10
-20
-30
-40
-50
-60
-70
-80
-90
-30
VDD=3.3V
RL=4Ω
CB=4.7uF
VDD=5V
-35
Po=1.5W
-40
RL=4Ω
-45
BTL
-50
-55
d
d
-60
-65
-70
-75
-80
-85
-90
-95
B
B
BTL
L to R
R to L
SE
-100
-100
20
50
100
200
500
Hz
1k
2k
5k
10k
20k
20
50
100
200
500
Hz
1k
2k
5k
10k
20k
Figure 37
Figure 38
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Global Mixed-mode Technology Inc.
G1420
CROSSTALK vs FREQUENCY
CROSSTALK vs FREQUENCY
-30
-35
-40
-20
-25
VDD=3.3V
Po=0.75W
RL=4Ω
BTL
-30
-35
-40
-45
-50
-55
-60
-65
-70
-75
-80
-85
-90
-95
VDD=5V
Po=75mW
RL=32Ω
-45
-50
-55
-60
-65
-70
-75
-80
-85
-90
-95
SE
d
B
d
B
R to L
L to R
R to L
L to R
-100
-100
20
50
100
200
500
Hz
1k
2k
5k
10k
20k
20
50
100
200
500
Hz
1k
2k
5k
10k
20k
Figure 39
Figure 40
CROSSTALK vs FREQUENCY
-30
-35
VDD=3.3V
-40
Po=35mW
-45
RL=32Ω
SE
-50
-55
-60
d
B
-65
-70
-75
-80
-85
-90
-95
R to L
L to R
-100
20
50
100
200
500
Hz
1k
2k
5k
10k
20k
Figure 41
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Global Mixed-mode Technology Inc.
G1420
CLOSED LOOP RESPONSE
Figure 42
CLOSED LOOP RESPONSE
Figure 43
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Global Mixed-mode Technology Inc.
G1420
CLOSED LOOP RESPONSE
Figure 44
CLOSED LOOP RESPONSE
Figure 45
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Global Mixed-mode Technology Inc.
G1420
SUPPLY CURRENT vs SUPPLY VOLTAGE
OUTPUT POWER vs SUPPLY VOLTAGE
2.5
2
10
9
8
7
6
5
4
3
2
1
0
THD+N=1%
BTL
Stereo BTL
Stereo SE
Each Channel
RL=4Ω
1.5
1
RL=3
Ω
RL=8Ω
0.5
0
3
4
5
6
2.5
3.5
4.5
5.5
6.5
SUPPLY VOLTAGE(V)
SUPPLY VOLTAGE(V)
Figure 46
Figure 47
OUTPUT POWER vs LOAD RESISTANCE
OUTPUT POWER vs SUPPLY VOLTAGE
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
2
1.8
1.6
1.4
1.2
1
0.8
0.6
0.4
0.2
0
THD+N=1%
SE
THD+N=1%
BTL
Each Channel
Each Channel
RL=8Ω
VDD=5V
RL=4Ω
RL=32Ω
VDD=3.3V
2.5
3.5
4.5
5.5
6.5
0
4
8
12
16
20
24
28
32
Supply Voltage(V)
Load Resistance(Ω)
Figure 48
Figure 49
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Global Mixed-mode Technology Inc.
G1420
OUTPUT POWER vs LOAD RESISTANCE
POWER DISSIPATION vs OUTPUT POWER
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
1.8
1.6
1.4
1.2
1
THD+N=1%
SE
RL=3Ω
Each Channel
VDD=5V
RL=4Ω
0.8
0.6
0.4
0.2
0
VDD=5V
RL=8Ω
BTL
Each Channel
VDD=3.3V
0
4
8
12
16
20
24
28
32
0
0.5
1
1.5
2
2.5
Load Resistance(Ω)
Po-Output Power(W)
Figure 50
Figure 51
POWER DISSIPATION vs OUTPUT POWER
POWER DISSIPATION vs OUTPUT POWER
0.35
0.3
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
RL=3Ω
RL=4Ω
RL=4Ω
RL=8Ω
0.25
0.2
0.15
0.1
VDD=5V
SE
Each Channel
VDD=3.3V
BTL
Each Channel
RL=8Ω
RL=32Ω
0.05
0
0
0.25
0.5
0.75
1
0
0.2
0.4
0.6
0.8
Output Power(W)
Output Power(W)
Figure 52
Figure 53
Ver: 1.1
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Global Mixed-mode Technology Inc.
G1420
POWER DISSIPATION vs OUTPUT POWER
Recommended PCB Layout
0.16
0.14
0.12
0.1
RL=4Ω
VDD=3.3V
SE
Each Channel
0.08
0.06
0.04
0.02
0
RL=8Ω
RL=32Ω
0
0.05
0.1
0.15
0.2
0.25
0.3
OUTPUT POWER(W)
Figure 54
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Global Mixed-mode Technology Inc.
Block Diagram
G1420
20k
21
20
RLINEIN
RHPIN
_
+
22
15
ROUT+
ROUT-
RIGHT
MUX
RBYPASS
19
RVDD
18
MUTEIN
HP/LINE
SE/BTL
TJ
16
14
2
11
BIAS CIRCUITS
MUTEOUT
SHUTDOWN
9
8
MODES CONTROL
CIRCUITS
LVDD
7
6
LBYPASS
+
LOUT-
LOUT+
10
3
LHPIN
5
4
_
LEFT
MUX
LLINEIN
20k
Parameter Measurement Information
11
8
MUTEIN
HP/LINE
SE/BTL
SHUTDOWN
16
14
LVDD
7
RL 4/8/32ohm
6
LBYPASS
CB
LOUT-
LOUT+
10
3
+
4.7µF
5
4
LHPIN
LLINEIN
CI
LEFT
MUX
_
AC source
RI
RF
BTL Mode Test Circuit
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Global Mixed-mode Technology Inc.
G1420
(Continued)
Parameter Measurement Information
11
8
MUTEIN
HP/LINE
SE/BTL
16
14
SHUTDOWN
VDD
LVDD
7
6
LBYPASS
CB
LOUT-
LOUT+
10
3
+
4.7µF
5
4
LHPIN
LLINEIN
CI
LEFT
MUX
_
AC source
RI
RL 32ohm
RF
SE Mode Test Circuit
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Global Mixed-mode Technology Inc.
Application Circuits
G1420
GND/HS
TJ
GND/HS
NC
24
23
1
2
LOUT+
ROUT+
3
4
22
21
CIR
CIL
AUDIO SOURCE
LLINEIN
RLINEIN
CFR
AUDIO SOURCE
RFL
RFL
CFL
RIR
RIL
LHPIN
RHPIN
LVDD
5
6
20
7
LBYPASS
RVDD
NC
RBYPASS
G1420
19
8
18
17
R
CSR
SHUTDWON
100K
Ω
COUTR
MUTE OUT
LOUT-
HP/LINE
ROUT-
9
16
15
10
R
1
3
MUTE IN
GND/HS
SE/BTL
1K
Ω
11
12
14
13
100K
Ω
4
2
GND/HS
PHONOJACK
COUTR
1K
Ω
Logical Truth Table
INPUTS
HP/LINE
OUTPUT
Shutdown Mute Out
AMPLIFIER STATES
Mute In
Input
L/R Out+
L/R Out-
Mode
Mute
Mute
Mute
SE/BTL
X
Low
High
X
X
X
----
High
High
High
----
----
----
High
High
X
X
X
----
VDD/2
VDD/2
BTL
Output
BTL
----
VDD/2
----
BTL
Low
Low
High
High
Low
High
Low
High
Low
Low
Low
Low
Low
Low
Low
Low
Low
Low
Low
Low
L/R Line
L/R HP
L/R Line
L/R HP
BTL
BTL
SE
Output
BTL
Output
SE
Output
----
----
Output
SE
SE
Output
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Global Mixed-mode Technology Inc.
G1420
Application Information
Input MUX Operation
There are two input signal paths – HP & Line. With the
prompt setting, G1420 allows the setting of different
gains for BTL and SE modes. Generally, speakers
typically require approximately a factor of 10 more
gain for similar volume listening levels as compared
with headphones.
-3 dB
SE Gain(HP)
BTL Gain(LINE)
To achieve headphones and speakers listening parity,
(RF(LINE/RI(LINE)) is suggested to be 5 times of (RF(HP)
=
-(RF(HP)/RI(HP)
)
fc
=
-2(RF(LINE)/RI(LINE)
)
Figure 2
/
R
I(HP)). The ratio of (RF(HP)/RI(HP)) can be determined by
Bridged-Tied Load Mode Operation
the applications. When the optimum distortion per-
formance into the headphones (clear sound) is impor-
tant, gain of –1 ((RF(HP) / RI(HP)) = 1) is suggested.
G1420 has two linear amplifiers to drive both ends of
the speaker load in Bridged-Tied Load (BTL) mode
operation. Figure 3 shows the BTL configuration. The
differential driving to the speaker load means that
when one side is slewing up, the other side is slewing
down, and vice versa. This configuration in effect will
double the voltage swing on the load as compared to a
ground reference load. In BTL mode, the peak-to-peak
voltage VO(PP) on the load will be two times than a
ground reference configuration. The voltage on the
load is doubled, this will also yield 4 times output
power on the load at the same power supply rail and
loading. Another benefit of using differential driving
configuration is that BTL operation cancels the dc off-
sets, which eliminates the dc coupling capacitor that is
needed to cancelled dc offsets in the ground reference
configuration. Low-frequency performance is then lim-
ited only by the input network and speaker responses.
Cost and PCB space can be minimized by eliminating
the dc coupling capacitors.
Single Ended Mode Operation
G1420 can drive clean, low distortion SE output power
into headphone loads (generally 16Ω or 32Ω) as in
Figure 1. Please refer to Electrical Characteristics to
see the performances. A coupling capacitor is needed
to block the dc offset voltage, allowing pure ac signals
into headphone loads. Choosing the coupling capaci-
tor will also determine the 3 dB point of the high-pass
filter network, as Figure 2.
fC=1/(2πRLCC)
For example, a 68uF capacitor with 32Ω headphone
load would attenuate low frequency performance be-
low 73Hz. So the coupling capacitor should be well
chosen to achieve the excellent bass performance
when in SE mode operation.
VDD
VDD
Vo(PP)
Vo(PP)
RL
2xVo(PP)
-Vo(PP)
VDD
CC
Vo(PP)
RL
Figure 1
Figure 3
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Global Mixed-mode Technology Inc.
G1420
MUTE and SHUTDOWN Mode Operations
G1420 implements the mute and shutdown mode
operations to reduce supply current, IDD, to the ab-
solute minimum level during nonuse periods for
battery-power conservation. When the shutdown pin
(pin 8) is pulled high, all linear amplifiers will be de-
activated to mute the amplifier outputs. And G1420
enters an extra low current consumption state, IDD is
smaller than 5µA. If pulling mute-in pin (pin 11) high,
it will force the activated linear amplifier to supply
the VDD/2 dc voltage on the output to mute the AC
performance. In mute mode operation, the current
consumption will be a little different between BTL,
SE. (SE < BTL) Typically, the supply current is
about 2.5mA in BTL mute operation. Shutdown and
Mute-In pins should never be left unconnected, this
floating condition will cause the amplifier operations
unpredictable.
VDD
100 k
Ω
50 k
Ω
Bypass
100 kΩ
Figure 4
Junction Temperature Measurement
Optimizing DEPOP Operation
Characterizing a PCB layout with respect to thermal
impedance is very difficult, as it is usually impossi-
ble to know the junction temperature of the IC.
G1420 TJ (pin 2) sources a current inversely pro-
portional to the junction temperature. Typically TJ
sources–120µA for a 5V supply at 25°C. And the
slope is approximately 0.22µA/°C. As the resistors
have a tolerance of ±20%, these values should be
Circuitry has been implemented in G1420 to mini-
mize the amount of popping heard at power-up and
when coming out of shutdown mode. Popping oc-
curs whenever a voltage step is applied to the
speaker and making the differential voltage gener-
ated at the two ends of the speaker. To avoid the
popping heard, the bypass capacitor should be
chosen promptly, 1/(CBx100kΩ) ≦ 1/(CI*(RI+RF)).
Where 100kΩ is the output impedance of the
mid-rail generator, CB is the mid-rail bypass capaci-
tor, CI is the input coupling capacitor, RI is the input
impedance, RF is the gain setting impedance which
is on the feedback path. CB is the most important
capacitor. Besides it is used to reduce the popping,
CB can also determine the rate at which the amplifier
starts up during startup or recovery from shutdown
mode.
calibrated on each device. When the temperature
sensing function is not used, TJ pin can be left
floating or tied to VDD to reduce the current con-
sumption.
Temperature sensing circuit is shown on Figure 5.
VDD
R
De-popping circuitry of G1420 is shown on Figure 4.
The PNP transistor limits the voltage drop across
the 50kΩ by slewing the internal node slowly when
power is applied. At start-up, the voltage at
BYPASS capacitor is 0. The PNP is ON to pull the
mid-point of the bias circuit down. So the capacitor
sees a lower effective voltage, and thus the charg-
ing is slower. This appears as a linear ramp (while
the PNP transistor is conducting), followed by the
expected exponential ramp of an R-C circuit.
R
5R
TJ
Figure 5
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Global Mixed-mode Technology Inc.
Package Information
G1420
D
24
L
1.88
1.88
3.85
E
E1
2.8
0.71
1
Note 5
A2
A1
e
b
NOTE:
1. Package body sizes exclude mold flash protrusions or gate burrs
2. Tolerance 0.1mm unless otherwise specified
3. Coplanarity : 0.1mm
4. Controlling dimension is millimeter. Converted inch dimensions are not necessarily exact.
5. Die pad exposure size is according to lead frame design.
6. Follow JEDEC MO-153
DIMENSION IN MM
DIMENSION IN INCH
SYMBOL
MIN.
-----
0.00
0.80
0.19
0.09
7.70
6.20
4.30
-----
0.45
-----
0º
NOM.
MAX.
1.15
0.10
1.05
0.30
0.20
7.90
6.60
4.50
-----
MIN.
-----
NOM.
MAX.
0.045
0.004
0.041
0.012
0.008
0.311
2.260
0.177
-----
A
A1
A2
b
-----
-----
1.00
-----
-----
-----
-----
0.039
-----
-----
0.000
0.031
0.007
0.004
0.303
0.244
0.169
-----
C
D
7.80
6.40
4.40
0.65
0.60
-----
0.307
0.252
0.173
0.026
0.024
-----
E
E1
e
L
y
θ
0.75
0.10
8º
0.018
-----
0º
0.030
0.004
8º
-----
-----
Taping Specification
Feed Direction
Typical TSSOP Package Orientation
GMT Inc. does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and GMT Inc. reserves the right at any time without notice to change said circuitry and specifications.
TEL: 886-3-5788833
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Ver: 1.1
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26
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