View ADA4431-1YCPZ-R7_1440904.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

ultralow power sd video filter with load detection ada4431-1 rev. 0 information furnished by analog devices is believed to be accurate and reliable. however, no responsibility is assumed by analog devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use. specifications subject to change without notice. no license is granted by implication or otherwise under any patent or patent rights of analog devices. trademarks and registered trademarks are the property of their respective owners. one technology way, p.o. box 9106, norwood, ma 02062-9106, u.s.a. tel: 781.329.4700 www.analog.com fax: 781.461.3113 ?2007 analog devices, inc. all rights reserved. features third-order, low-pass video filter 1 db flatness out to 6 mhz 27 db rejection at 27 mhz low quiescent current: 4.7 ma typical low power-down current: 24 a typical load detection capability sag correction allows use of smaller capacitors in ac-coupled outputs low supply voltage: 2.5 v to 3.6 v charge pump creates a negative voltage from single positive supply allows capless output coupling with no dc offset rail-to-rail output high input-to-output isolation in disabled state 89 db @ 1 mhz small package 3 mm 3 mm lfcsp low 0.55 mm package height wide operating temperature range: ?40c to +85c applications portable media players portable gaming consoles cell phones digital still cameras portable dvd players portable video cameras pin configuration 1 2 3 gnd subs +v s 4 cap1 12 10 9 +v s dis 11 in ldo 7 c a p 3 8 c a p 4 6 g n d 5 c a p 2 1 3 f b 1 1 4 f b 2 1 5 o u t 1 6 s a g load detect lpf g = 2 charge pump 06734-001 figure 1. lpf x1 x2 out in 75? 4 3 2 7 56891112 video dac/ encoder system controller ldo dis gnd cap4 cap3 0.1f cap2 cap1 0.1f subs gnd 1.0f sag fb1 fb2 14 15 16 13 video out 0.1f 0.1f +v s + v s +v s ada4431-1 11 0 0 6734-002 figure 2. typical application circuit general description the ada4431-1 is a fully integrated video reconstruction filter that combines excellent video specifications with low power consumption, making it ideal for portable video filtering applications. the ada4431-1 is able to detect whether a video load is present at the output, powering down the device when the load is disconnected. the ada4431-1 operates on single supplies as low as 2.5 v while providing the dynamic range required by the most demanding video systems. the on-board charge pump provides a virtual negative supply, allowing the video signal to be dc-coupled and the black level to be set to ground, while the sync passes cleanly at 300 mv below ground. when operating with the charge pump off, the ada4431-1 provides a dc offset to keep the sync tip approximately 100 mv above ground. in addition, the part features sag correction, which permits the use of smaller capacitors in applications with ac-coupled outputs. the ada4431-1 is packaged in a low profile 16-lead lfcsp and operates in the industrial temperature range of ?40c to +85c.
ada4431-1 rev. 0 | page 2 of 12 table of contents features .............................................................................................. 1 applications ....................................................................................... 1 pin configuration ............................................................................. 1 general description ......................................................................... 1 revision history ............................................................................... 2 specifications ..................................................................................... 3 absolute maximum ratings ............................................................ 5 thermal resistance ...................................................................... 5 maximum power dissipation ..................................................... 5 esd caution .................................................................................. 5 pin configuration and function descriptions ..............................6 typical performance characteristics ..............................................7 theory of operation .........................................................................9 overview ........................................................................................9 charge pump operation ..............................................................9 load detect ....................................................................................9 evaluation board ............................................................................ 10 outline dimensions ....................................................................... 12 ordering guide .......................................................................... 12 revision history 8/07revision 0: initial version
ada4431-1 rev. 0 | page 3 of 12 specifications v s = 3.0 v (@ t a = 25c, v in = 1 v p-p, r l = 150 , dis = 3.0 v, charge pump on), unless otherwise noted. table 1. parameter test conditions/comments min typ max unit electrical specifications quiescent supply current normal mode video load present 4.7 7.2 ma load searching mode no video load 0.1 ma disabled mode dis = 0 v 24 a disable pin current dis = 3.0 v (enabled and charge pump on) 3 6 a dis = 0 v (disabled) ?17 ?30 a supply voltage range 2.5 3.6 v input voltage limited by output range 1.3 v input resistance 10 m input capacitance 1 pf output voltage range ?0.8 to +2.8 v output offset voltage ?650 ?600 ?560 mv power supply rejection f = 100 khz, output referred 36 42 db pass-band gain 5.7 6.0 6.2 db input-to-output isolationdisabled f = 1 mhz, dis = 0 v 89 db filter characteristics ?3 db bandwidth 7.1 7.9 9.1 mhz 1 db flatness 6 mhz out-of-band rejection f = 27 mhz 25 27 db differential gain modulated 10 step ramp, sync tip at 0 v 0.7 % differential phase modulated 10 step ramp, sync tip at 0 v 0.3 degrees linear output current 40 ma group delay variation f = 100 khz to 5 mhz 30 ns
ada4431-1 rev. 0 | page 4 of 12 v s = 3.0 v (@ t a = 25c, v in = 1 v p-p, r l = 150 , dis = floating, charge pump off), unless otherwise noted. table 2. parameter test conditions/comments min typ max unit electrical specifications quiescent supply current normal mode video load present 1.6 2.2 ma load searching mode no video load 0.1 ma disabled mode dis = 0 v 24 a disable pin current dis = 0 v ?17 ?30 a supply voltage range 2.5 3.6 v input voltage limited by output range 1.3 v input resistance 10 m input capacitance 1 pf output voltage range 0 to 2.8 v output offset voltage 0.1 0.2 v power supply rejection f = 100 khz, output referred 38 48 db pass-band gain 5.8 6.0 6.2 db input-to-output isolationdisabled f = 1 mhz, dis = 0 v 89 db filter characteristics ?3 db bandwidth 6.7 7.5 8.4 mhz 1 db flatness 6 mhz out-of-band rejection f = 27 mhz 26 29 db differential gain modulated 10 step ramp, sync tip at 0 v 0.4 % differential phase modulated 10 step ramp, sync tip at 0 v 0.3 degrees linear output current 40 ma group delay variation f = 100 khz to 5 mhz 30 ns
ada4431-1 rev. 0 | page 5 of 12 absolute maximum ratings table 3. parameter rating supply voltage 4.0 v power dissipation see figure 3 storage temperature range C65c to +125c operating temperature range C40c to +85c lead temperature (soldering 10 sec) 300c junction temperature 150c stresses above those listed under absolute maximum ratings may cause permanent damage to the device. this is a stress rating only; functional operation of the device at these or any other conditions above those indicated in the operational section of this specification is not implied. exposure to absolute maximum rating conditions for extended periods may affect device reliability. thermal resistance ja is specified for the device (including exposed pad) soldered to a high thermal conductivity 2s2p circuit board, as described in eia/jesd 51-7. the exposed pad is not electrically connected to the device. it is typically soldered to a pad on the pcb that is thermally and electrically connected to an internal ground plane. table 4. thermal resistance package type ja unit 16-lead lfcsp-uq (cp-16-12) 43 c/w maximum power dissipation the maximum safe power dissipation in the ada4431-1 package is limited by the associated rise in junction temperature (t j ) on the die. at approximately 150c, which is the glass transition temperature, the plastic changes its properties. even temporarily exceeding this temperature limit can change the stresses that the package exerts on the die, permanently shifting the parametric performance of the ada4431-1. exceeding a junction temperature of 150c for an extended period can result in changes in the silicon devices potentially causing failure. the power dissipated in the package (p d ) is the sum of the quiescent power dissipation and the power dissipated in the package due to the load drive. the quiescent power is the voltage between the supply pins (v s ) times the quiescent current (i s ). the power dissipated due to the load drive depends upon the particular application. the power due to load drive is calculated by multiplying the load current by the associated voltage drop across the device. rms voltages and currents must be used in these calculations. airflow increases heat dissipation, effectively reducing ja . in addition, more metal directly in contact with the package leads and exposed pad from metal traces, through-holes, ground, and power planes reduces the ja . figure 3 shows the maximum safe power dissipation in the package vs. the ambient temperature for the 16-lead lfcsp package (43c/w) on a jedec standard 4-layer board. 06743-003 5.0 4.5 4.0 3.5 3.0 2.5 2.0 1.5 1.0 maximum power dissipation (w) ?40 ?30 ?20 ?10 0 10 20 30 40 50 60 70 80 90 100 ambient temperature (c) figure 3. maximum power dissipation vs. temperature for a 4-layer board esd caution
ada4431-1 rev. 0 | page 6 of 12 pin configuration and fu nction descriptions 1 2 3 gnd subs +v s 4 cap1 12 10 9 +v s dis 11 in ldo 7 c a p 3 8 c a p 4 6 g n d 5 c a p 2 1 3 f b 1 1 4 f b 2 1 5 o u t 1 6 s a g 06743-004 ada4431-1 top view (not to scale) figure 4. pin configuration table 5. pin function descriptions pin o. nemonic description 1 +v s supply voltage. 2 in video input. 3 dis disable pin. high = charge pump on, fl oating = charge pump off, low = disabled. 4 ldo load detect output. high = video load present. 5 cap4 capacitor 2, lead 2. 6 cap3 capacitor 2, lead 1. 7 gnd ground. 8 cap2 capacitor 1, lead 2. 9 cap1 capacitor 1, lead 1. 10 +v s supply voltage. 11 subs substrate voltage pin. bypass to gnd with 1.0 f capacitor. 12 gnd ground. 13 sag sag feedback pin. 14 out video output. 15 fb2 load detect feedback pin 2. connect to device side of series termination resistor. 16 fb1 load detect feedback pin 1. connect to load side of series termination resistor.
ada4431-1 rev. 0 | page 7 of 12 typical performance characteristics v s = 3.0 v (@ t a = 25c, v in = 1 v p-p, r l = 150 , unless otherwise noted). 10 0 ?10 ?20 ?30 ?40 ?50 ?60 ?70 normalized gain (db) 0.1 1 10 100 frequency (mhz) charge pump on charge pump off 06734-005 figure 5. large signal frequency response 1 0 ?5 ?4 ?3 ?2 ?1 normalized gain (db) 0.1 1 10 frequency (mhz) charge pump on charge pump off 06734-006 figure 6. frequency response flatness ? 60 ?105 ?100 ?95 ?90 ?85 ?80 ?75 ?70 ?65 normalized gain (db) 0.1 1 10 100 frequency (mhz) dis = 0v 06734-007 figure 7. input-to-output isolation vs. frequency 60 0 10 20 30 40 50 group delay (ns) 0.1 1 10 100 frequency (mhz) charge pump off charge pump on 06734-008 figure 8. group delay vs. frequency 0 ?5 ?10 ?15 ?20 ?25 ?30 ?35 ?40 ?45 ?50 psrr (db) 0.1 1 10 100 frequency (mhz) charge pump on charge pump off v in = 100mv p-p dis = 3v 06734-009 figure 9. psrr vs. frequency 10 0 ?10 ?20 ?30 ?40 ?50 ?60 normalized gain (db) 0.1 1 10 100 frequency (mhz) +25c 0c ?40c +85c 06734-010 figure 10. frequency response for various temperatures
ada4431-1 rev. 0 | page 8 of 12 1 ?1 0 ?2 ?3 ?4 ?5 ?6 ?7 normalized gain (db) 0.1 1 10 frequency (mhz) +25c 0c ?40c +85c 06734-011 figure 11. flatness response for various temperatures 6 5 4 3 2 1 0 supply current (ma) 03 . 0 2.5 2.0 1.5 1.0 0.5 disable (dis) pin voltage (v) 06734-012 figure 12. supply current vs. disable (dis) pin voltage 7 6 5 4 3 2 1 0 70 60 50 40 30 20 10 0 supply current (ma) disabled supply current (a) ?40 ?30 ?20 ?10 0 10 20 30 40 50 60 70 80 90 temperature (c) active disabled 06734-014 figure 13. supply current vs. temperature 06734-015 ch2 200mv m100ns a ch1 316mv 2 t figure 14. transient response 06734-016 ch1 2.00v ch2 500mv m10.0ms a ch1 1.72v 1 t disable (dis) pin output 2 figure 15. output enable 06734-017 ch1 2.00v ch2 500mv m40.0ns a ch1 1.72v 1 2 t disable (dis) pin output figure 16. output disable
ada4431-1 rev. 0 | page 9 of 12 theory of operation overview the ada4431-1 is designed for exceptional performance as both a filter and a low power driver for portable video applications. this performance is achieved by providing third-order filtering without trading off power consumption or device size. while consuming only 4.7 ma quiescent supply current, the ada4431-1 provides video output on a single-supply as low as 2.5 v. the ada4431-1 also features a load detect circuit, which senses current through the external 75 back-termination resistor. when either no video load or a short circuit is detected, the ada4431-1 enters a low power state. in this state, it draws 0.1 ma, continues to monitor the load current, and powers up automatically when a video load is connected. optionally, the ada4431-1 can be powered down via the disable pin (dis). another external pin (ldo) outputs the load detection state (for example, to an external system controller). this pin is high (+v s ) when a video load is present, and low (0 v) in the absence of a video load or when the output is short-circuited. the ada4431-1 is intended for use in applications that have both ac- and dc-coupled inputs and outputs. the rail-to-rail buffer on the ada4431-1 output is able to drive 2 v p-p video signals into two doubly terminated video loads (150 each) on a single 2.5 v supply. the ada4431-1 has a gain of 2 when the sag correction pin is tied directly to the output, which makes up for the 6 db termination loss (see figure 17 , output option 1). when the sag feature is used, the ada4431-1 has a low frequency gain of 2.5 ( 8 db) and a high frequency gain of 2 (see figure 17 , output option 2). signal offsets and supply levels must be considered when using the sag correction feature to ensure that there are no headroom issues. the input range of the ada4431-1 includes ground, while the output range is limited by the saturation of the output devices. saturation occurs several tens of mv from the positive and negative supply rails. the high input impedance and low input capacitance of the ada4431-1 offer advantages in a number of low power applications. in reconstruction filter applications, the dac can be placed in its lowest power mode, allowing the use of a large- valued load resistor. using a large-valued load resistor does not interfere with the frequency response of the ada4431-1. charge pump operation the on-board charge pump creates a virtual negative supply for the output driver, which allows the output signal to be dc-coupled, with its black level at 0 v and sync tip at ?300 mv. the charge pump is enabled whenever the disable pin (dis) is held high. if dis is left floating, or placed in a high impedance state, the ada4431-1 is powered up, but the charge pump is disabled, which is typically the case for ac-coupling of the output. when dis is driven to 0 v, the entire device is powered down. table 6. disable (dis) pin function summary dis pin device state charge pump state low disabled disabled high enabled enabled high-z enabled disabled load detect the load detect feature provides additional system power management to keep the power consumption of a portable device to the absolute minimum. the ada4431-1 monitors the output load for three conditions: a normal load, a shorted load, and an open load. each of these conditions occurs for a video load, an audio load, and no load, respectively. only in the video load condition will the ada4431-1 power up from 0.1 ma to 4.7 ma. a single i/o pin, ldo, notifies the system by either being high for a video load or low for a short and open load. with this information, it is intended that the system controller power down any power intensive video processing blocks to realize substantial power savings. the ada4431-1 operates autonomously, requiring no inputs to monitor the condition of the output load.
ada4431-1 rev. 0 | page 10 of 12 evaluation board the ada4431-1 evaluation board allows designers to assess the performance of the part in their particular application. the board includes input and output sma coaxial connectors and 75 -controlled impedance signal traces. power (2.5 v to 3.6 v) is applied to the red v+ loop connector, and ground is connected to the black gnd loop connector. the output signal can be configured for dc coupling or ac coupling. when ac-coupled, two options are available: the standard single capacitor configuration (minimum of 220 f) and the sag-corrected configuration, using two smaller capacitors (47 f and 22 f). jumper block j2 allows the load detect feature to be evaluated without connecting an external video load. connecting a jumper from the center pin to the 75 position applies a 75 load to the output and causes the ldo pin to go high. connecting the center pin to the gnd position short circuits the output, causing the ada4431-1 to power down, and the ldo pin to go low. if an external video load is connected to the out connector, the jumper should be removed. with the jumper removed, disconnecting the external load also causes the ada4431-1 to power down. jumper block j4 exercises the disable pin (dis). when a jumper is connected from the center pin to v+, the charge pump is enabled. connecting the center pin to gnd forces the ada4431-1 into low power mode. with the jumper removed, the ada4431-1 is enabled but the charge pump is disabled. a schematic of the ada4431-1 evaluation board, with output coupling options, is shown in figure 17 . figure 18 and figure 19 show the front and back layout of the evaluation board. gnd subs +v s 1 2 3 4 cap1 +v s dis 12 10 9 11 in ldo 7 8 6 5 1 3 1 4 1 5 1 6 c a p 3 c a p 4 g n d c a p 2 f b 1 f b 2 o u t s a g ada4431-1 c1 0.1f c2 0.1f c7 0.1f c3 1.0f subs v+ v+ r4 dni r3 dni ldout ldo gnd dis v+ + c8 10f r2 75 ? in dis r1 0 ? v+ c9 0.1f c4 0 ? c5 0 ? c6 0 ? dc-coupled output ld2 r5 75 ? 75? gnd j4 out r6 75? j2 gnd 1 3 1 4 + ac-coupled output c4 0 ? c5 0 ? c6 220f output option 1 1 3 1 4 ac-coupled output with sag correction c4 22f c5 47f c6 0 ? output option 2 + + 06734-018 figure 17. evaluation board schematic
ada4431-1 rev. 0 | page 11 of 12 06743-019 figure 18. evaluation boardfront 06743-020 figure 19. evaluation boardback
ada4431-1 rev. 0 | page 12 of 12 outline dimensions compliant to jedec standards mo-248-ueed. 053106-b 1 0.50 bsc p i n 1 i n d i c a t o r top view bottom view seating plane index area 0.60 0.55 0.51 0.30 0.25 0.18 0.05 max 0.02 nom 0.40 max 0.30 nom 0.08 ref 3.00 bsc sq 1.80 1.70 sq 1.55 16 5 13 8 9 12 4 exposed pad figure 20. 16-lead lead frame chip scale package [lfcsp_uq] 3 mm 3 mm body, ultra thin quad (cp-16-12) dimensions shown in millimeters ordering guide model temperature range package description pa ckage option branding ordering quantity ada4431-1ycpz-r2 1 ?40c to +85c 16-lead lfcsp_uq cp-16-12 h12 250 ADA4431-1YCPZ-R7 1 ?40c to +85c 16-lead lfcsp_uq cp-16-12 h12 3,000 ada4431-1ycpz-rl 1 ?40c to +85c 16-lead lfcsp_uq cp-16-12 h12 10,000 t 1 z = rohs compliant part. ?2007 analog devices, inc. all rights reserved. trademarks and registered trademarks are the property of their respective owners. d06734-0-8/07(0) ttt

▲Up To Search▲

Price & Availability of ADA4431-1YCPZ-R7

	To Download ADA4431-1YCPZ-R7 Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .