View G1426_1827396.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

ver: 1.0 dec 04, 2003 tel: 886-3-5788833 http://www.gmt.com.tw 1 G1426 global mixed-mode technology inc. 2.2w stereo audio amplifier features ? depop circuitry integrated ? output power at 10% thd+n, vdd=5v --2.2w/ch (typical) into a 4 ? ? ? ? load ? output power at 1% thd+n, vdd=5v --2w/ch (typical) into a 4 ? ? ? ? load --1.2w/ch (typical) into a 8 ? ? ? ? load ? bridge-tied load (btl) ? shutdown control available ? thermal protection ? surface-mount power package 20-pin tssop-p applications ? stereo power amplifiers for notebooks or desktop computers ? multimedia monitors ? stereo power amplifiers for portable audio systems general description the G1426 is a stereo audio power amplifier in 20pin tssop package. it can deliver 2w continuous rms power into 4 ? load per channel in bridge-tied load (btl) mode at 5v supply voltage under 1% thd. to simplify the audio system design in the notebook ap- plication, the G1426 supports the bridge-tied load (btl) mode for driving the speakers. for the low cur- rent consumption applications, the shdn mode is supported to disable the G1426 when it is idle. the current consumption can be further reduced to below 2a. ordering information order number marking temp. range package G1426d5x G1426 -40c to +85c tssop-20l G1426f2x G1426 -40c to +85c tssop-20l (fd) note: x specify the packing type u: tape & reel t: tube * tssop-20l (fd): thermal pad pin configuration gnd/hs +outb vdd -outb -inb bypass shutdown +outa vdd -outa -ina gnd/hs +ina nc G1426 20pin tssop 13 20 19 18 17 16 15 5 6 7 8 9 10 1 4 3 2 14 gnd/hs thermal pad top view bottom view +inb 11 12 nc gnd/hs nc gnd/hs gnd/hs +outb vdd -outb -inb bypass shutdown +outa vdd -outa -ina gnd/hs +ina nc G1426 20pin tssop 13 20 19 18 17 16 15 5 6 7 8 9 10 1 4 3 2 14 gnd/hs thermal pad top view bottom view +inb 11 12 nc gnd/hs nc gnd/hs
ver: 1.0 dec 04, 2003 tel: 886-3-5788833 http://www.gmt.com.tw 2 G1426 global mixed-mode technology inc. absolute maximum ratings supply voltage, v cc ???????..?...??.??...6v operating ambient temperature range t a ??.???????????.???.-40c to +85c maximum junction temperature, t j ?..???.?.150c storage temperature range, t stg ?.?.-65c to+150c soldering temperature, 10seconds, t s ???.??260c power dissipation (1) t a 25c????????????????.2.7w t a 70c????????????????.1.7w t a 85c???????.?????????1.4w electrostatic discharge, v esd human body mode..????????.-3000 to 3000 (2) note: (1) : recommended pcb layout (2) : human body model : c = 100pf, r = 1500 ? , 3 positive pulses plus 3 negative pulses electrical characteristics dc electrical characteristics, v dd = 5.0v, t a =+25c, unless otherwise noted parameter symbol condition min typ max unit supply current i dd v dd = 5v - 8.5 15 ma dc differential output voltage v o(diff) v dd = 5v,gain = 2 - 5 50 mv i dd in shutdown i sd v dd = 5v - 0.1 2 a (ac operation characteristics, v dd = 5.0v, t a =+25c, r l = 4 ? ? ? ? , unless otherwise noted) parameter symbol condition min typ max unit thd = 1%, btl, r l = 4 ? - 2 - thd = 1%, btl, r l = 8 ? - 1.25 - thd = 10%, btl, r l = 4 ? - 2.5 - output power (each channel) see note p (out) thd = 10%, btl, r l = 8 ? - 1.6 - w p o = 1.6w, btl, r l = 4 ? - 300 - p o = 1w, btl, r l = 8 ? - 100 - total harmonic distortion plus noise thd+n v i = 1v, rl = 10k ? , g = 1 - 10 - m% maximum output power bandwidth b om g = 10, thd = 1% - 20 - khz phase margin r l = 4 ? , open load - 65 - power supply ripple rejection psrr f = 120hz - 75 - db channel-to-channel output separation f = 1khz - 80 - db input impedance zi - 2 - m ? signal-to-noise ratio p o = 500mw, btl - 90 - db output noise voltage v n output noise voltage - 55 - v (rms) note :output power is measured at the output terminals of the ic at 1khz.
ver: 1.0 dec 04, 2003 tel: 886-3-5788833 http://www.gmt.com.tw 3 G1426 global mixed-mode technology inc. pin description pin name i/o function 1 shutdown i shutdown mode control signal input, places entire ic in shutdown mode when held high, i dd is below 2a. 2,7,10,19,20 gnd/hs ground connection for circuitry, directly connected to thermal pad. 3 +outa o a channel + output 4,17 vdd supply voltage for circuitry. 5 -outa o a channel - output 6 -ina i a channel input signal 8 +ina i a channel positive input of opamp, biasing dc operation of opamp 9 nc i nc 11 nc i nc 12 nc nc 13 +inb i b channel positive input of opamp, biasing dc operation of opamp 14 bypass connect to voltage divider for internal mid-supply bias. 15 -inb i b channel input signal 16 -outb o b channel - output 18 +outb o b channel + output
typical characteristics table of graphs v n output noise voltage supply ripple rejection ratio crosstalk closed loop response 17 i dd supply current p d power dissipation total harmonic distortion plus noise total harmonic distortion plus noise vs output power vs frequency vs output power 19,20 figure thd +n total harmonic distortion plus noise vs frequency 2,4,6,9,11 vs output power 1,3,5,7,8,10 vs frequency 13 vs frequency 12 vs frequency 14 vs frequency vs supply voltage 15 p o output power vs supply voltage 16 vs load resistance 18 0.01 10 0.02 0.05 0.1 0.2 0.5 1 2 5 % 3m 3 5m 10m 20m 50m 100m 200m 500m 1 2 w vdd=5v rl=3 btl av=-2v/v 1khz 20khz 20hz 0.01 10 0.02 0.05 0.1 0.2 0.5 1 2 5 % 20 20k 50 100 200 500 1k 2k 5k 10k hz po=1.8w vdd=5v rl=3 btl av=-2v/v figure 1 figure 2 global mixed-mode technology inc. G1426 ver: 1.0 dec 04, 2003 tel: 886-3-5788833 http://www.gmt.com.tw 4
total harmonic distortion plus noise total harmonic distortion plus noise vs output power vs frequency total harmonic distortion plus noise total harmonic distortion plus noise vs output power vs frequency 0.01 10 0.02 0.05 0.1 0.2 0.5 1 2 5 % 3m 3 5m 10m 20m 50m 100m 200m 500m 1 2 w vdd=5v rl=4 btl av=-2v/v 1khz 20hz 20khz 0.01 10 0.02 0.05 0.1 0.2 0.5 1 2 5 % 20 20k 50 100 200 500 1k 2k 5k 10k hz vdd=5v rl=4 btl po=2w av=-1v/v av=-2v/v av=-4v/v 0.01 10 0.02 0.05 0.1 0.2 0.5 1 2 5 % 2m 2 5m 10m 20m 50m 100m 200m 500m 1 w vdd=5v rl=8 btl av=-2v/v 20khz 1khz 20hz 0.01 10 0.02 0.05 0.1 0.2 0.5 1 2 5 % 20 20k 50 100 200 500 1k 2k 5k 10k hz vdd=5v rl=8 btl po=1w av=-1v/v av=-2v/v av=-4v/v figure 3 figure 4 figure 5 figure 6 global mixed-mode technology inc. G1426 ver: 1.0 dec 04, 2003 tel: 886-3-5788833 http://www.gmt.com.tw 5
total harmonic distortion plus noise total harmonic distortion plus noise vs output power vs output power total harmonic distortion plus noise total harmonic distortion plus noise vs frequency vs output power 0.01 10 0.02 0.05 0.1 0.2 0.5 1 2 5 % 1m 1 2m 5m 10m 20m 50m 100m 200m 500m w vdd=5v rl=32 btl av=-2v/v 20kh 1khz 20hz 0.01 10 0.02 0.05 0.1 0.2 0.5 1 2 5 % 1m 1 2m 5m 10m 20m 50m 100m 200m 500m w vdd=3.3v rl=4 btl av=-2v/v 1khz 20khz 20hz 0.01 10 0.02 0.05 0.1 0.2 0.5 1 2 5 % 20 20k 50 100 200 500 1k 2k 5k 10k hz vdd=3.3v rl=4 btl po=0.75w av=-1v/v av=-2v/v av=-4v/v 0.01 10 0.02 0.05 0.1 0.2 0.5 1 2 5 % 1m 1 2m 5m 10m 20m 50m 100m 200m 500m w vdd=3.3v rl=8 btl av=-2v/v 1khz 20khz 20hz figure 7 figure 8 figure 9 figure 10 global mixed-mode technology inc. G1426 ver: 1.0 dec 04, 2003 tel: 886-3-5788833 http://www.gmt.com.tw 6
total harmonic distortion plus noise supply ripple rejection ratio vs frequency vs frequency output noise voltage vs frequency channel separation 0.01 10 0.02 0.05 0.1 0.2 0.5 1 2 5 % 20 20k 50 100 200 500 1k 2k 5k 10k hz vdd=3.3v rl=8 btl po=0.45w av=-4v/v av=-2v/v av=-1v/v -100 -30 -95 -90 -85 -80 -75 -70 -65 -60 -55 -50 -45 -40 -35 d b 20 20k 50 100 200 500 1k 2k 5k 10k hz channel a to b channel b to a vdd=5v po=1.5w rl=4 btl -100 +0 -95 -90 -85 -80 -75 -70 -65 -60 -55 -50 -45 -40 -35 -30 -25 -20 -15 -10 -5 d b 20 20k 50 100 200 500 1k 2k 5k 10k hz vdd=5v rl=4 cb=4.7f vripple=0.5vpp btl mode 10u 100u 20u 30u 40u 50u 60u 70u 80u 90u v 20 20k 50 100 200 500 1k 2k 5k 10k hz vdd=5v rl=4 btl mode 20khz figure 11 figure 12 figure 13 figure 14 global mixed-mode technology inc. G1426 ver: 1.0 dec 04, 2003 tel: 886-3-5788833 http://www.gmt.com.tw 7
5 5.5 6 6.5 7 7.5 8 8.5 9 3 3.5 4 4.5 5 5.5 6 supply voltage(v) supply current(ma) stereo btl 0 0.5 1 1.5 2 2.5 3 2.5 3.5 4.5 5.5 6.5 supply voltage(v) output power(w) thd+n=1% btl each channel rl=3 rl=4 rl=8 figure 15 figure 16 supply current vs supply voltage output power vs supply voltage open loop response figure 17 ver: 1.0 dec 04, 2003 tel: 886-3-5788833 http://www.gmt.com.tw 8 global mixed-mode technology inc. G1426
0 0.5 1 1.5 2 2.5 0 5 10 15 20 25 30 35 load resistance( ) output power(w) thd+n=1% btl each channel vdd=5v vdd=3.3v 0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 0 0.5 1 1.5 2 2.5 po-output power(w) power dissipation vdd=5v btl each channel rl=3 rl=4 rl=8 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0 0.2 0.4 0.6 0.8 1 1.2 po-output power(w) power dissipation(w) rl=3 rl=4 rl=8 vdd=3.3v btl each channel power dissipation vs output power output power vs load resistance figure 18 figure 19 power dissipation vs output power figure 20 global mixed-mode technology inc. G1426 recommended pcb layout unit:mm ver: 1.0 dec 04, 2003 tel: 886-3-5788833 http://www.gmt.com.tw 9
ver: 1.0 dec 04, 2003 tel: 886-3-5788833 http://www.gmt.com.tw 10 G1426 global mixed-mode technology inc. block diagram application circuits - + amp a1 amp a2 + - 20k 20k 20k -out a +out a - + amp a1 amp a2 + - 20k 20k 20k -out b +out b v dd + + r f 20k r 1 20k c 1 1f audio input audio input c 1 1f r 1 20k c s 1f tant 4,17 6 8 14 -in a +in a bypass -in b 15 13 +in b c b 0.33f r f 20k 9,11,12 nc 1 shutdown gnd 2,7,10,19,20 5 3 r l 8 r l 8 18 16 50k v dd /2 50k - + amp a1 amp a2 + - 20k 20k 20k -out a +out a - + amp a1 amp a2 + - 20k 20k 20k -out b +out b v dd + + r f 20k r 1 20k c 1 1f audio input audio input c 1 1f r 1 20k c s 1f tant 4,17 6 8 14 -in a +in a bypass -in b 15 13 +in b c b 0.33f r f 20k 9,11,12 nc 1 shutdown gnd 2,7,10,19,20 5 3 r l 8 r l 8 18 16 50k v dd /2 50k - + ampa1 ampa2 + - 20k 20k 20k -out a +out a - + ampa1 amp a2 + - 20k 20k 20k -out b +out b v dd 4,17 6 8 14 -in a +in a bypass -in b 15 13 +in b 9,11,12 nc 1 shutdown gnd 2,7,10,19,20 5 3 18 16 50k v dd /2 50k - + ampa1 ampa2 + - 20k 20k 20k -out a +out a - + ampa1 amp a2 + - 20k 20k 20k -out b +out b v dd 4,17 6 8 14 -in a +in a bypass -in b 15 13 +in b 9,11,12 nc 1 shutdown gnd 2,7,10,19,20 5 3 18 16 50k v dd /2 50k
ver: 1.0 dec 04, 2003 tel: 886-3-5788833 http://www.gmt.com.tw 11 G1426 global mixed-mode technology inc. application information bridged-tied load mode operation G1426 has two linear amplifiers to drive both ends of the speaker load in bridged-tied load (btl) mode operation. figure 1 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 v o (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. shutdown mode operations G1426 implements the shutdown mode operations to reduce supply current, i dd, to the absolute mini- mum level during nonuse periods for battery-power conservation. when the shutdown pin (pin 1) is pulled high, all linear amplifiers will be deactivated to mute the amplifier outputs. and G1426 enters an extra low current consumption state, i dd is smaller than 2 a. shutdown pin should never be left un- connected, this floating condition will cause the am- plifier operations unpredictable. optimizing depop operation circuitry has been implemented in G1426 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/(c b x100k ? ) Q 1/(c i *(r i +r f )). where 100k ? is the output impedance of the mid-rail generator, c b is the mid-rail bypass capaci- tor, c i is the input coupling capacitor, r i is the input impedance, r f is the gain setting impedance which is on the feedback path. c b is the most important capacitor. besides it is used to reduce the popping, c b can also determine the rate at which the amplifier starts up during startup or recovery from shutdown mode. de-popping circuitry of G1426 is shown on figure 2. the pnp transistor limits the voltage drop across the 225k ? 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. vdd vo(pp) vdd -vo(pp) 2xvo(pp) r l figure 1 vdd vo(pp) vdd -vo(pp) 2xvo(pp) r l figure 1 vdd vo(pp)+vdd/2 vdd/2 vo(pp) vdd/2 r l figure 2 vdd vo(pp)+vdd/2 vdd/2 vo(pp) vdd/2 r l figure 2
ver: 1.0 dec 04, 2003 tel: 886-3-5788833 http://www.gmt.com.tw 12 G1426 global mixed-mode technology inc. package information tssop-20l package 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. follow jedec mo-153 dimension in mm dimension in inch symbol min. nom. max. min. nom. max. a ----- ----- 1.20 ----- ----- 0. 048 a1 0.05 ----- 0.15 0. 002 ----- 0. 006 a2 0.80 1.00 1.05 0.031 0.039 0.041 b 0.19 ----- 0.30 0. 007 ----- 0. 012 c 0.09 ----- 0.20 0. 004 ----- 0. 008 d 6.40 6.50 6.60 0.252 0.256 0.260 e ----- 6.40 ----- ----- 0. 252 ----- e1 4.30 4.40 4.50 0.169 0.173 0.177 e ----- 0.65 ----- ----- 0. 026 ----- l 0.45 0.60 0.75 0.018 0.024 0.030 y ----- ----- 0.10 ----- ----- 0. 004 0 ----- 8 0 ----- 8 e1 e d b a1 a2 c l e y a e1 e d b a1 a2 c l e y y a
ver: 1.0 dec 04, 2003 tel: 886-3-5788833 http://www.gmt.com.tw 13 G1426 global mixed-mode technology inc. tssop-20l (fd) package 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. nom. max. min. nom. max. a 0.80 ----- 1.15 0. 031 ----- 0. 045 a1 0.00 ----- 0.10 0. 000 ----- 0. 004 a2 0.80 1.00 1.05 0.031 0.039 0.041 b 0.19 ----- 0.30 0. 007 ----- 0. 012 c 0.09 ----- 0.20 0. 004 ----- 0. 008 d 6.40 6.50 6.60 0.252 0.256 0.260 e ----- 6.40 ----- ----- 0. 252 ----- e1 4.30 4.40 4.50 0.169 0.173 0.177 e ----- 0.65 ----- ----- 0. 026 ----- l 0.45 0.60 0.75 0.018 0.024 0.030 y ----- ----- 0.10 ----- ----- 0. 004 0 ----- 8 0 ----- 8 d1 3.90 ----- 4.28 0. 153 ----- 0. 168 e2 2.30 ----- 2.78 0. 091 ----- 0. 109 taping specification gmt inc. does not assume any res ponsibility for use of any circuitry described, no circuit patent licenses are implied and gmt inc. r eserves the right at any time wit hout notice to change said circuitry and specifications. feed direction typical tssop package orientation feed direction typical tssop package orientation e1 e d b a1 a2 c l e note 5 d1 e2 y a e1 e d b a1 a2 c l e note 5 d1 e2 y y a

▲Up To Search▲

Price & Availability of G1426

	To Download G1426 Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .