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NTE3470 Integrated Circuit Floppy Disk Read Amplifier System
Description: The NTE3470 is a monolithic READ Amplifier System for obtaining digital information from floppy disk storage. It is designed to accept the differential AC signal produced by the magnetic head and produce a digital output pulse that corresponds to each peak of the input signal. The gain stage amplifies the input waveform and applies it to an external filter network, enabling the active differentiator and time domain filter to produce the desired output. Features: D Combines All the Active Circuitry to Perform the Floppy Disk Read Amplifier Function in One Circuit D Improved (Positive) Gain TC and Tolerance D Improved Input Common Mode Absolute Maximum Ratings: (TA = +25C, Note 1 unless otherwise specified) Power Supply Voltage (Pin11), VCC1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7V Power Supply Voltage (Pin18), VCC2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16V Input Voltage (Pin1 and Pin2), VI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.2 to +7.0V Output Voltage (Pin10), VO . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.2 to +7.0V Operating Ambient Temperature Range, TA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 to +70C Operating Junction Temperature, TJ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +150C Storage Temperature Range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -65 to +150C Note 1. "Absolute Maximum Ratings" are those values beyond which the safety of the device cannot be guaranteed. They are not meant to imply that the device should be operated at these limits. The table of "Electrical Characteristics" provides conditions for actual device operation. Recommended Operating Conditions: Power Supply Voltage, VCC (VCC1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +4.75 to +5.25V (VCC2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +10 to +14V Operating Ambient Temperature Range, TA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 to +70C
Electrical Characteristics: (TA = 0 to +70C, VCC1 = 4.75 to 5.25V, VCC2 = 10 to 14V unless otherwise specified)
Parameter Differential Voltage Gain Input Base Current Input Common Mode Range, Linear Operation Differential Input Voltage, Linear Operation Output Voltage Swing Differential Output Source Current, Toggled Output Sink Current (Pin16 and Pin17) Small Signal Input Resistance Small Signal Output Resistance, Single Ended Bandwidth, -3dB Common Mode Rejection Ratio Symbol AVD IIB viCM viD voD IO IOS ri ro BW CMRR TA = +25C TA = +25C, VCC1 = 5V, VCC2 = 12V viD = 2mVRMS, TA = +25C, VCC1 = 5V, VCC2 = 12V TA = +25C, f = 100kHz, AVD = 40dB, vin = 200mVP-P, VCC1 = 5V, VCC2 = 12V TA = +25C, VCC2 = 12V, 4.75V VCC1 5.25V, AVD = 40dB TA = +25C, VCC1 = 5V, 10V VCC2 14V, AVD = 40dB VDO VCO en ICC TA = +25C, viD = vin = 0V viD = vin = 0V, Differential and Common Mode TA = +25C, BW = 10Hz to 1MHz VCC1 = 5.25V, S1 to Pin12 or Pin13 VCC2 = 14V Active Differentiator Section Differentiator Output Sink Current, Pin12 and Pin13 Peak Shift Differentiator Input Resistance, Differential Differentiator Output Resistance, Differential IOD PS riD roD TA = +25C VOD = VCC1 Note 2 1.0 - - - 1.4 - 30 40 - 5 - - mA % k 5% Max THD 5% Max THD Test Conditions f = 200kHz, ViD = 7mVRMS Min 80 - -0.1 - 3 - 2.8 100 - 10 50 Typ 100 -10 - - 4 8.0 4.0 250 15 - - Max 130 -25 1.5 25 - - - - - - - Unit V/V A V mVP-P VP-P mA mA k MHz dB
VCC1 Supply Rejection Ratio VCC2 Supply Rejection Ratio Differential Output Offset Common Mode Output Offset Differential Noise Voltage Referred to Input Supply Current
50 50 - - - - -
- - - 3.0 15 40 4.8
- - 0.4 - - - -
dB dB V V VRMS mA mA
Note 2. f = 250kHz, viD = 1VP-P, icap = 500A where PS = 1/2 tPS1 - tPS2 x 100% tPS1 + tPS2 VCC1 = 5V, VCC2 = 12V
Electrical Characteristics (Cont'd): (TA = 0 to +70C, VCC1 = 4.75 to 5.25V, VCC2 = 10 to 14V unless otherwise specified)
Parameter Digital Section Output Voltage High Logic Level, Pin10 Output Voltage Low Logic Level, Pin10 Output Rise Time, Pin10 Output Fall Time, Pin10 Timing Range Mono #1 (t1A and t1B) Timing Accuracy Mono #1 Timing Range Mono #2 Timing Accuracy Mono #2 VOH VOL tTLH tTHL t1A, t1B Et1 t2 Et2 t2 = 200ns = 0.625 R2C2, Note 6, Note 7 t1 = 1s = 0.625 R1C1 + 200ns, Note 3, Note 4, Note 5 VCC1 = 4.75V, VCC2 = 12V, IOH = -0.4mA VCC1 = 4.75V, VCC2 = 12V, IOH = 8mA 2.7 - - - 500 85 150 85 - - - - - - - - - 0.5 20 25 4000 115 1000 115 V V ns ns ns % ns % Symbol Test Conditions Min Typ Max Unit
Note 3. R1 = 6.4k, C1 = 200pF. Note 4. Accuracy guaranteed for R1 in the range 1.5k R1 10k and C1 in the range 150pF C1 680pF. Note 5. To minimize current transients, C1 should be kept as small as is convenient. Note 6. R2 = 1.6k, C2 = 200pF. Note 7. Accuracy guaranteed for R2 in the range 1.5k R2 10k and C2 in the range 100pF C1 800pF.
Pin Connection Diagram
Amplifier Input 1 Amplifier Input 2 Offset Decoupling 3 Offset Decoupling 4 GND 5 One-Shot Component Mono #1 6 One-Shot Component Mono #1 7 One-Shot Component Mono #2 8 One-Shot Component Mono #2 9
18 VCC2 17 Amplifier Output 16 Amplifier Output 15 Active Differentiator Input 14 Active Differentiator Input 13 Differentiator Component 12 Differentiator Component 11 VCC1 10 Data Output
18
10 .250 (6.35)
1
9
.870 (22.0) Max
.325 (8.25) .160 (4.06) Max
.100 (2.54) Typ .800 (20.32)
.125 (3.17) Min

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