LT1394 Linear Technology, LT1394 Datasheet
LT1394
Available stocks
Related parts for LT1394
LT1394 Summary of contents
Page 1
... Like the LT1016, LT1116 and LT1671, this comparator has complementary outputs designed to interface directly to TTL or CMOS logic. The LT1394 may operate from either a single 5V supply or dual 5V supplies. Low offset voltage specifications and high gain allow the LT1394 to be used in precision applications ...
Page 2
... V 5.4V – – – OUT + V 4.6V 1mA OUT + V 4.6V 4mA OUT ORDER PART TOP VIEW NUMBER 8 Q OUT LT1394CS8 + 7 Q OUT LT1394IS8 – GND 6 LATCH 5 ENABLE S8 PART MARKING S8 PACKAGE 1394 = 150 C, = 190 1394I MIN TYP MAX 0.8 2.5 4.0 4 0.1 0.5 0.8 2 4.5 7.0 – ...
Page 3
... Note 3: The LT1394CMS8 and LT1394CS8 are guaranteed to meet specified performance from and are designed, characterized and expected to meet these extended temperature limits, but are not tested at – and 85 C. The LT1394IS8 is guaranteed to meet the extended temperature limits. Note 4: Input offset voltage (V ...
Page 4
... OD t PDLH 2.5 3.0 –50 – TEMPERATURE ( C) 1394 G04 Positive Common Mode Limit vs Temperature 100 125 –50 – TEMPERATURE ( C) LT1394 G07 t PDHL t PDLH 5.2 5.4 5.6 1394 G03 t PDHL 75 100 125 1394 G05 75 100 125 1394 G08 ...
Page 5
... TYPICAL PERFORMANCE CHARACTERISTICS Negative Common Mode Limit vs Temperature SINGLE 5V S –1 –2 –3 –4 – –6 –50 – 100 TEMPERATURE ( C) LT1394 G09 Positive Supply Current Supply Voltage 10 – –60mV OUT 125 ...
Page 6
... LT1394 W U TYPICAL PERFORMANCE CHARACTERISTICS + t Response Time to PD 5mV Overdrive 5mV + IN –95mV 2ns/DIV 2MHz 5mV PIN FUNCTIONS + V (Pin 1): Positive Supply Voltage. Normally 5V. +IN (Pin 2): Noninverting Input. –IN (Pin 3): Inverting Input. – V (Pin 4): Negative Supply Voltage. Normally either 0V or – ...
Page 7
... U APPLICATIONS INFORMATION Common Mode Considerations The LT1394 is specified for a common mode range of – 3. supply or a common mode range 3. single 5V supply. A more general consider- ation is that the common mode range is 0V below the negative supply and 1.5V below the positive supply, inde- pendent of the actual supply voltage ...
Page 8
... Crystal Oscillators Figure 3’s circuits are crystal oscillators. In the circuit (a) the resistors at the LT1394’s positive input set a DC bias point. The 2k-0.068 F path sets up phase shifted feedback and the circuit looks like a wideband unity-gain follower at DC. The crystal’ ...
Page 9
... Figure 7’s circuit adds a differ- ential preamplifier ahead of the LT1394, increasing gain. This permits 500 V comparisons in 18ns. A parallel path DC stabilization approach eliminates preamplifier drift as an error source the differential preamplifier, operat- ing at a gain of 100. Its output is AC-coupled to the LT1394. LT1394 9 ...
Page 10
... Response to 500 V Overdrive 5V 1M* – LM134 226 * 1M* + 10mV/ C 10k* 470k* 10MHz 0.05ppm/ C 50k 100k LT1004-1.2 1M FREQ SET 1394 F05 1/2 LT1126 – 10k 200 10k – A3 1/2 LT1126 + –5V 2k 200pF LM733 LT1394 A = 100 – – – –5V OUTPUT 1394 F07 ...
Page 11
... Response (Trace B) to 500 V Overdrive (Trace correct, amplified composite signal at the LT1394’s posi- tive input in Trace D. The LT1394’s output is Trace E. Figure 9 details circuit propagation delay. The output responds in 18ns to a 500 V overdrive on a 1mV step. Figure 10 plots response time versus overdrive. As might be expected, propagation delay decreases at higher overdrives. A1’ ...
Page 12
... Q4 goes off within 2ns of the trigger input (Trace A) dropping low, enabling the current source (Q2’s emitter is Trace C). Concurrently, the 1000pF capacitor’s ramp (Trace B) begins. The LT1394’s output (Trace D) drops low about 7ns later, returning high after crossing (in this case) a relatively low programming voltage ...
Page 13
... Timing Error. 4GHz Sampling Oscilloscope’s Output Is a Series of Dots OUTPUT 10M 10k C = 2V/DIV A = 1V/DIV B = 1V/DIV 0.1 F 0.1 F 1394 F15 Figure 17. Input (Trace A), FET Source (Trace B) and Output (Trace C) Waveforms for the Trigger. Total Delay Is 8ns LT1394 200ps/DIV 1394 F16 10ns/DIV 1394 F17 13 ...
Page 14
... A2 to set the trigger voltage at the LT1394’s positive input. The LT1394’s negative input is biased directly from A1’s output. The LT1394’s output, the circuit’s output, is unaffected by >85:1 signal amplitude variations. Bandwidth limiting in A1 does not affect trigger- ing because the adaptive trigger threshold varies ratiometrically to maintain circuit output ...
Page 15
... TYP 0.016 – 0.050 0.014 – 0.019 0.406 – 1.270 (0.355 – 0.483) LT1394 0.118 0.004** (3.00 0.102 0.034 0.004 (0.86 0.102) 0.006 0.004 (0.15 0.102) MSOP (MS8) 1197 0.189 – ...
Page 16
... This example is specifically intended to provide a 4 NTSC sub-carrier tunable oscillator suitable for phase locking. The LT1394 is set crystal oscillator, operating similarly to Figure 3 (a). The varactor diode is biased from the tuning input. The tuning network is arranged drive provides a reasonably symmetric, broad tuning range around the 14 ...