[ak4252] ms1091-e-01 2010/04 - 1 - general description the ak4252 is a video amp with lp f. the output coupling capacit or can be removed because the ak4252 includes the negative power supply circuit. the ak4252 is housed in a space-saving 8-pin uson package. feature 1. video function ? a composite video input ? a video-amp (+12db) for composite video signal ? low pass filter ? charge pump circuit for negative power supply 2. ta = -40 85 c 3. power supply: 2.7 3.6v (typ. 3.0v) 4. power supply current: 10 ma 5. package: 8 pin uson block diagram vin clamp lpf vout vdd charge pump clock generator pdn cp cn vss vee figure 1. ak4252 block diagram ak4252 output coupling capacitor-less video amp with lpf
[ak4252] ms1091-e-01 2010/04 - 2 - ordering guide ak4252vu ? 40 +85 c 8 pin uson (0.5mm pitch) akd4252 evaluation board for ak4252 pin layout 1 cp vdd top view 2 3 4 8 7 6 5 vin pdn vout vss vee cn
[ak4252] ms1091-e-01 2010/04 - 3 - pin/function no. pin name i/o function 1 cp o positive charge pump capacitor terminal pin 2 vdd - power supply pin. 3 vin i composite video signal input pin 4 pdn i power-down mode pin. internal pull down 100k . ? h ? : power up, ? l ? : power down. 5 vout o composite video signal driver pin 6 vss - ground pin 7 vee o negative voltage output pin for video amplifier 8 cn i negative charge pump capacitor terminal pin absolute maximum ratings (vss=0v; note 1 ) parameter symbol min max units power supplies vdd ? 0.3 4.0 v input current, any pin except supplies iin - 10 ma input voltage ( note 2 ) vin ? 0.3 (vdd+0.3) or 4.0 v ambient temperature (powered applied) ta ? 40 85 c storage temperature tstg ? 65 150 c note 1. all voltages are with respect to ground. note 2. vin, pdin pins. max value is smaller value be tween (vdd+0.3)v and 4.0v. the vout pin becomes hi-z at the pdn pin = ?l?. therefore the vout pin is availabl e to signal line from another device by wired-or. the input signal to the vout pin must not ex ceed this input voltage range. any volta ge must not be applied to the cn pin. warning: operation at or beyond these limits may result in permanent damage to the device. normal operation is not guaranteed at these extremes. recommended operating conditions (vss=0v; note 1) parameter symbol min typ max units power supplies vdd 2.7 3.0 3.6 v note 1. all voltages with respect to ground. * akm assumes no responsibility for the usage beyond the conditions in this datasheet.
[ak4252] ms1091-e-01 2010/04 - 4 - analog chracteristics (ta=25 c; vdd=3.0v; vss = 0v; unless otherwise specified) parameter conditions min typ max units v input characteristics input voltage - - 0.75 vpp input sync chip clamp voltage ( note 3 ) -0.193 -0.143 -0.093 v v output characteristics ( note 4 ) output gain vin=100khz, 0.2vpp 11.0 12.0 13.0 db maximum output voltage vin=100khz , thd=-30db 2.52 - - vpp s/n bw=100kh 6mhz, ( note 5 ) - 65 - db secondary distortion vin=3.58mhz, 0.2vpp (sin wave) - -45 - db load resistance 140 150 - load capacitance c1 ( figure 2 ) c2 ( figure 2 ) - - - - 15 400 pf pf lpf frequency response response at 6.75mhz -3 -0.5 - db input= 0.2vpp, sin wave response at 27mhz - -40 -20 db (0db at 100khz) group delay |gd3mhz - gd6mhz| - 10 100 nsec power supplies power up black signal is output and no load resistance. - 10 15 ma power down pdn pin = 0v - 1 2 a note 3. the charge pump circuit will not wo rk well, if the sync chip clamp voltage input to the vin pin is not within this voltage range. this sync chip clamp voltage is the voltage from the pedestal voltage note 4. the measurement point is the point a in figure 2 note 5. the reference signal is the 100% white signal. video signal output 75 ohm 75 ohm c2 r1 r2 c1 measurement point a figure 2. load capacitance c1 and c2 dc chracteristics (ta=25 c; vdd=2.7 3.6v) parameter symbol min typ max units high-level input voltage (pdn pin) low-level input voltage (pdn pin) vih vil 1.5 - - - - 0.6 v v
[ak4252] ms1091-e-01 2010/04 - 5 - video block the video amp has drivability for a load resistance of 150 . the ak4252 has a composite input and output and includes a low pass filter (lpf). internal negative power supply circu it supplies negative voltage to the video amp and video amp 0v output is used for a pedestal level. therefore, the output coupling capacitor can be removed. vdd charge pump cp cn vss vee 1uf 1uf negative power a k4252 (+) c2 c1 (+) note 6. c1 and c2 capacitors should have the low esr (equiva lent series resistance) over all temperature range. when these capacitors have the polarity, the positive polarity pin should be connected to the cp pin and the vss pin. non polarity capacitors can also be used. figure 3. negative power supply circuit vout 7 5 a k4252 0v 75 figure 4. video signal output power down control when the pdn pin is ?l?, the ak4252 is forced to power down mode (power consumption: typ 1 a). the vout pin becomes hi-z at the pdn pin = ?l?. the ak4252 includes a power-on-reset function. therefore any external reset is not required.
[ak4252] ms1091-e-01 2010/04 - 6 - system design figure 5 shows the system connection diagram for the ak4252. an evaluation board [akd4252] is available which demonstrates the optimum layout, power s upply arrangements and measurement results. top view power supply 2.7 3.6v dsp or p + 10 vdd 2 vin 3 pdn 4 cp 1 75 0.1u 8 7 6 5 cn vee vss vout 1 0.1 1 (+) (+) figure 5. typical connection diagram note: - any voltage must not be applied to the cn pin.
[ak4252] ms1091-e-01 2010/04 - 7 - package 8pin uson (unit: mm) 2.2 0.05 2.2 0.05 0.05 0.6max 1.2 0.05 1.9 0.05 0.25 0.05 0.5 0.2 0.05 0.05 m we recommend mounting this portion onto circuit b oard in order to secure mounting intensity. please do not connect to a power supply, gnd, signal line, etc. material & lead finish package molding compound: e poxy, halogen (bromine and chlorine) free lead frame material: ni lead frame surface treatment: au plate
[ak4252] ms1091-e-01 2010/04 - 8 - marking ak4252vu 252 x xx 1 xxx: date code (3 digit) date (yy/mm/dd) revision reason page contents 09/06/10 00 first edition 10/04/08 03 error correct 7 material & lead finish lead frame surface treatment: ag plate au plate important notice z these products and their specifications are subject to change without notice. when you consider any use or application of these products , please make inquiries the sales office of asahi kasei microdevices corporation (akm) or au thorized distributors as to current status of the products. z akm assumes no liability for infringement of any patent, intellectual property, or ot her rights in the application or use of any information c ontained herein. z any export of these products, or devices or systems containing them, may require an export license or other official approval under the law and regulations of the country of export pertaining to cu stoms and tariffs, currency exchange, or strategic materials. z akm products are neither intended nor aut horized for use as critical components note1) in any safety, life support, or other hazard related device or system note2) , and akm assumes no responsibility for such use, except for the use approved with the express written consent by re presentative director of akm. as used here: note1) a critical component is one whose failure to func tion or perform may reasonably be expected to result, whether directly or indirectly, in the loss of the safety or effectiveness of the device or system containing it, and which must therefore meet very hi gh standards of performance and reliability. note2) a hazard related device or system is one desi gned or intended for life support or maintenance of safety or for applications in medicine, aeros pace, nuclear energy, or other fields, in which its failure to function or perform may reasonably be expected to result in loss of life or in significant injury or damage to person or property. z it is the responsibility of the buyer or distributor of akm products , who distributes, dis poses of, or otherwise places the product with a third party, to notify such third party in advance of the above content and conditions, and the buyer or distributor agrees to assume any and a ll responsibility and liability for and hold akm harmless from any and all claims arising from the use of said product in the absence of such notification. revision history
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