7-3 amplifiers innovation and ex c ell e n c e ? ? features 70 nanosecond settling to 0.01% 1ghz gain bandwidth product 100db open loop gain 80db minimum cmrr C55 to +125c operation industry standard general description datels am-1435 is an ultrafast settling, wideband operational amplifier. utilizing precision thin-film hybrid construction and differential input operational amplifier design techniques, the am-1435 achieves a settling time of only 70 nanoseconds for a 10v step to 0.01% accuracy. high-speed performance is optimized with high open-loop gain, flat frequency response beyond 10khz, and a roll-off of 6db/ octave to beyond 100mhz. typically, gain bandwidth product is 1ghz, and slew rate is 300v/microsecond. am-1435s dc characteristics include a dc open loop gain of 100db, 1m w input impedance, and an initial input offset voltage of only 2mv. input offset voltage drift is typically 5v/c. also featured is a minimum common mode rejection ratio of 80db and full power frequency of 8mhz. the am-1435 is designed specifically for applications requiring high accuracy in the amplification of complex wideband waveforms. such applications include radar and sonar signal processing, video instrumentation, ultrafast a/d and d/a converters and sample-hold amplifiers. power supply requirements are 15v at 30ma maximum quiescent current. models are specified for operation over the commercial (0 to +70c) and military (C55 to +125c) temperature ranges. a high-reliability version manufactured and screened to datels ql screening program is also available. the package is a 14-pin ceramic dip. am-1435 ultra-fast, wideband operational amplifiers figure 1. functional block diagram input/output connections pin function 1 optional bypass capacitor 2 output 3 compensation capacitor 4 +15v supply (+v s ) 5 offset adjust 6 offset adjust 7 Cinput 8 +input 9 n.c. 10 n.c. 11 n.c. 12 C15v supply (Cv s ) 13 output current sink 14 common 7 + @14ma 56 offset adjust 34 compensation capacitor +15v supply 1 optional bypass capacito r 2 output 13 output current sink 14 common 12 C15v supply C input 7 +input 8
datel, inc. , 11 cabot boulevard, mansfield, ma 02048-1194 (u.s.a.) tel: 508-339-3000 fax: 508-339-6356 ? for immediate assistance 800 -233-2765 7-4 am-1435 ? ? functional specifications (typical at +25c and 15v supplies, unless otherwise noted.) input min. typ. max. units differential between inputs 4 volts common mode voltage range 7 8.5 volts common mode rejection ratio 1mhz 70 db dc 80 100 db input impedance common mode 1 xx 2 m w xx pf differential mode 2.5 xx 2 k w xx pf input bias current 2040 a input offset current 0.3 a input offset voltage 25mv performance dc open loop gain a 90 100 db input offset voltage drift 5 25 v/c input bias current drift 50 100 na/c input offset current drift 2 na/c input voltage noise 0.01hz to 10hz 15 vp-p 100hz to 10khz 1.6 vrms 10hz to 1mhz 5.2 vrms input current noise ? 0.01hz to 10hz 2.5 nap-p 100hz to 10khz 2.5 narms 10hz to 1mhz 3.5 narms power supply rejection ratio 0.15 mv/v dynamic characteristics gain bandwidth product 700 1000 mhz unity gain bandwidth 150 mhz full power frequency ? 8 10 mhz settling time 10v to 0.025% ? 6075ns 10v to 0.01% ? 70ns 5v to 1.0% 25 ns 5v to 0.1% 40 60 ns 1v to 1.0% 10 ns 1v to 0.1% 20 ns slew rate ? 250 300 v/s overshoot 1% propagation delay 5ns rise time (10v step) 40 ns overload recovery time 50ns output output voltage a 5 7 volts output current a 10 14 ma stable capacitative load ? 1000 pf power requirements rated supply voltages 12 15 16 volts quiescent current 2230ma footnotes: specified for dc linear operation. common mode voltage range prior to fault condition is 10v maximum. adjustable to zero. a r l = 500 w . ? referred to input. ? c1 = 0.5pf. ? c1 = 1pf. ? c1 = 3pf, noise gain >2. ? requires 18c/w heat sink above +85c. physical/environmental parameters min. typ. max. units operating temp. range, case AM-1435MC 0 +70 c am-1435mm, mm-ql ? C55 +125 c storage temp. range C65 +150 c package type 14-pin, metal-sealed, ceramic dip technical notes 1. the use of good high-frequency circuit board layout techniques is required for rated performance. the extensive use of a ground plane for all common connections is recommended. lead lengths should be kept to a minimum with point-to-point connections wired directly to the amplifier pins. 1f tantalum bypass capacitors should be used at the 15v supply pins. 2. operation of the am-1435mm and mm-ql over the +85 to +125c temperature range requires additional thermal dissipation to achieve rated performance. use of an 18c/w heat sink is recommended. 3. no input protection is provided so as to maximize frequency response. as a result, several precautions must be observed. do not apply the positive supply voltage before the negative supply. do not apply signals to either input prior to power-up. if frequency response is not critical, installation of an external input-protection circuit is recommended. 4. a 1f bypass capacitor (c4) connected from optional bypass capacitor (pin 1) to common (pin 14) may be required to inhibit output oscillation when driving capacitive loads. 5. to ensure stable operation when the noise gain is less than 10, a 2pf compensation capacitor (c1) must be connected between pins 3 and 7. the value of the compensation capacitor may be application sensitive. 6. the am-1435 is a prime choice as a current-to-voltage converter due to its excellent e os and i os temperature coefficient ratings. input bias currents are easily compensated by adding a resistor from pin 8 to ground, which is equal to the parallel combination of the feedback resistor and input impedance. absolute maximum ratings, all models positive supply, pin 4 +18v negative supply, pin 12 C18v lead temperature (soldering, 10s) 300 c
7-5 amplifiers ? ? am-1435 figure 4. gain and phase vs. frequency (compensated 2pf) figure 3. gain and phase vs. frequency (uncompensated) (r1) x (r4) r1 + r4 r2 = typical connection and compensation the typical connection diagram (above) shows the am-1435 in a unity-gain inverting configuration. when used in any conventional operational-amplifier configuration, the am-1435 (as a non-inverting amplifier) requires a noise gain of at least two (noise gain = 1 + r4/r1). the 2pf compensation capacitor, c1, at pin 3 is required for stable operation when the noise gain is less than 10. compensation for bias current is provided by r2 and its value is determined by the formula: the offset adjust potentiometer r3 and the compensation capacitor c4 are optional. note, however, that c4 should be implemented when driving capacitive loads to prevent oscillation of the output stage. operation of the am-1435 at low impedances requires careful attention to include the feedback resistor as a part of the total output load. figure 2. typical connection diagram offset adjust (opt.) +15v C15v + 1 2 13 14 12 7 3 8 500 w 1k w + + + 1f r1 c1 c2 1f c3 1f c4 (opt.) input r2 2pf r3 r4 outpu t am-1435 6 5 4 C 1k w 1k w -20 0 20 40 60 80 100 120 100 200 500 1k 10k 100k 1m 10m 100m 180 140 100 60 40 0 phase angle (degrees) frequency (hz) open loop voltage gain (db) phase angle gain -20 0 20 40 60 80 100 120 100 200 500 1k 10k 100k 1m 10m 100m 0 20 60 100 140 180 phase angle (degrees) frequency (hz) open loop voltage gain (db) phase angle gain
datel, inc. , 11 cabot boulevard, mansfield, ma 02048-1194 (u.s.a.) tel: 508-339-3000 fax: 508-339-6356 ? for immediate assistance 800 -233-2765 7-6 am-1435 ? ? mechanical dimensions inches (mm) ordering information operating model temp. range AM-1435MC 0 to +70c am-1435mm C55 to +125c am-1435mm-ql C55 to +125c figure 6. psrr vs. frequency figure 5. cmrr vs. frequency 120 110 100 90 80 70 60 50 40 30 20 2k 5k 10k 100k 1m 10m 100m 1k frequency ( hz ) cmrr (db) 20 50 100 1k 10k 100k 1m 10 frequency (hz) psrr (db) 100 90 80 70 60 50 40 performance charts 14-pin dip seating plane 0.025 0.010 (0.635) 0.200 max. (5.080) 0 .160 max. (4.064) 0.195 max. (4.953) 0.500 max. (12.70) 0.100 typ. (2.540) 0.100 (2.540) 0.300 0.010 (7.620) 0.100 (2.540) 0.600 0.005 (15.240) 0.805 max. (20.45) 17 8 14 0.018 0.002 (0.457) 0.010 0.002 (0.254) dimension tolerances (unless otherwise indicated): 2 place decimal (.xx) 0.010 (0.254) 3 place decimal (.xxx) 0.005 (0.127) lead material: kovar alloy lead finish: 50 microinches (minimum) gold plating over 100 microinches (nominal) nickel plating
|
