LH0086 NSC | Alldatasheet
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= 3 National 3 : o Semiconductor = re x So So LH0086/LHO086C F Digitally-Programmable-Gain Amplifier General Description Features The LH0086 is a self-contained, high-accuracy, digitally-pro- ™@ 0.01% maximum gain accuracy at gain= 1 grammable-gain amplifier. It consists of a FET-input opera. ™ 0.005% typical gain non-linearity tional amplifier, a precision resistor ladders, and a digitally- m 1 ppm/°C typical gain drift programmable switch network. A three-bit TTL-compatible gj 40100 input impedance digital input selects accurate gain settings of 1, 2,5, 10,20, @ 80 dB minimum PSRR. 50, 100, or 200. um TTL-compatible digital inputs The LH0086 exhibits low offset voltage, high input imped- g 9 ys settling to 0.01% ance, fast settling, high power supply rejection ratio, and excellent gain accuracy and gain non-linearity. Applications The LHO086 is specified for operation from —55°C to citi + 125°C, The LHOO86C is specified from -25°C to +85, % DAA aca Both devices are hermetically sealed in a 14-lead dual-in- fo rang Ss fine metal package. ™ Adaptive servo loops ine meta pacKege Simplified Schematic and Connection Diagrams orseet . suet ufo ft ad 5 Mur * ances ae | rot | Large ot! a Dual-In-Line Package \\ ns DIGITAL GND 1 “ aa 1 $m we — wi. Ltn gra | » —2 12 sana own L aw “ ‘FEEDBACK | iy Your (sense) —> tw ‘ : ' nm ‘WouT (FORCE) OFFSET AD) Z ! 3 | wee orrser ans i Ly 1 te Top View: ASE 8 ELECTICALLY ISOLATED | $m Order Number LHOO86D or LHO086CD eu z See NS Package Number D14F inpuT ) 01 O- 220 MITA 9! oa TUK /5657-1 3-225
o o 2 . 8} Absolute Maximum Ratings | It Military/Aerospace specified devices are required, Ta Operating Temperature Range: a please contact the National Semiconductor Sales LHoo86 55°C to +125°C s (Nets euors for availability and specifications. LH0086C —25°C to +85°C So —65"
4 Vg Supply Voltage (Note 1) + 18v Ts Storage Temperature 65°C to +150°C
| Vin Analog Input Voltage (Note 2) +15V Soldering, 10 4 +300°¢ Vin(H) Digital input Voltage -4V, +Vg E80 rat (Sol . ie seconds) Pp Power Dissipation 500 mw rating to be determined. Output Short Circuit Duration Continuous Vg= £15V, Ri = 10 k®, Twins Ta < Tax, Pin 10 connected to Pin 11, Pin 5 connected to Pin 6 (Non-inverting) LHO086 LHO0B6C Symbol Units ee sae ee Vos/AT | Input Offset Voltage Vin=0V 10 BVEC ‘Change with Temperature [| soo [TT t00 | a Fin | Input Resistance Po te oa Ay | Voltage Gain | [of | fo TT [ [eo | | [eo | | | [to [| 100 || |_| 200 ff [zoo [| Gain Error Ay=1 0.003 | 0.01 0.003 | 0.03 Ay= 10,20 TA= 26°C 0.05 | 0.4 01 | 02 Ayv= 50,100,200 0.1 0.3 0.15 0.4 % Ay=1 0.003 | 0.02 0.003 | 0.06 Av=2,5 0.03 01 0.05 0.2 Ay= 10,20 041 02 0.1 0.3 Ay=50,100,200 0.15 0.4 0.15 0.5 aaviaT | Gain TemperatureCoeficient|ay=1 TT 0 | T [ 0 |_| ppmrc PSRR _ | Power Supply Rejection Ratio | £8V <Vs < + 18V [so | o« | | |o/| | Note 1: Improper supply power-on sequence may damage the device. See Power ‘Supply Connection Section under Applications information. Note 2: for supply voltages less than + 15V the maximum input voltage is equal to the ‘supply voitage. ‘Note 3: Due to short production test time, these parameters are specified at junction temperature, T;= 25°C. In normal operation the junction temperature rises above the ambient temperature, Ta, as a result of the internal power dissipation, PD. Ty~Ta+8ja*PD where Oa is the thermal resistance from junction to ambient (typically 65°C/W). ‘Note 4: The input bias currents are junction leakage currents which approximately double for every 10°C increase in junction temperature. Note 5; Refer to RETSOO86D for LHOO86D military specifications. 3-226
c Vg= +15V, RL=10 k®, Twins Ta < Tmax. Pin 10 connected to Pin 11, Pin 5 connected to Pin 6 (Non-inverting). 3 Isc Output Short-Circuit Current mA 3 [se] [so] se] | 200 Ro | Ouputtesstance fT va=1 | feos | | oos || Vn | iatar"ovinputvonage [| ST Por [OT lor Jy Vin | Bata" mputvonage [| ao | Lf eo | in| Bigtalor inputcurent | viw=oav Tas | oo | | ts | ao | Vs | Suppyvotagerenge | sf tao | | sta | eo] | ste | Is) [ [ess -es[ | -4s | -25 | Vg= +15V, Ta=25°C, RL=10 kO, Pin 10 connected to Pin 11, Pin 5 connected to Pin 6 (Non-Inverting) Bw Small Signal Bandwidth [aver | 000 | [av-so | | eo | [avezoo ft Te [aver | as | 1% [ayeso Tf es TO [av=zoo | | 2 | Paw [ tomemowie _F yas FL kttz ED ee ee ee Paes [fs | ts Settling Time (Figure 7) 0.01% AVo=20V [av=so | | 2 | | BS [avezoo | fs | os a Change én Equivalent Input Noise Rg~ 1000 | sw-orton | | 3 | | pvpp Voltage (Figure 6) Ay=100 pew f= +— nv/VHz in Equivalent input Noise Current [| oo | | pave 3-227
a 1” rT Tk Tt 15 Input Voltage Range o ee ee me ai = a aia Oe Reaiipziil a4 s HT H 5 4 ETN {| Sere Fatih OES ese, cemeeit . eet 2 Soa sass ull MTT, LE w 100 tk 10K 100k s 10 15 2 1 2 5 0 Ow 58 100 FREQUENCY (Hz) SUPPLY VOLTAGE (+¥) GAIN (W/¥)
100 Settling Time “ Supply Current € 0 valine mt Input Noise
3 EERE ioe 27
P " eg a Pym H ese) PEERS NOI === ==—— ae scsae i ml Eo eee | be (Aim se ee |) in 2 5 1 20 58 100 200 5 10 15 20 Fy % 100 tk 1% 100k GAIN (W/V), ‘SUPPLY VOLTAGE (+¥) FREQUENCY (Hz) Wideband Noise Rs = 502. Bandwidth = 0.1 Hz to 10 Hz Rg = 50. Bandwidth = 10 Hz to 10 KHz 1 wV/division Vertical, 5 seconds/division Horizontal 5 wV/division Vertical, 1 ms/division Horizontal 3-228
given by the familiar gain equation of a non-inverting amplifier. pin and the V~ pin as shown in Figure 1. quired values. FET switches are used to select the desired ground should be run separately to a single point ground. are selected by a 1 of 8 decoder, by applying the proper (Figure 1). TABLE I. Gain-Control Codes ator will be typically 0.1%. ! Proper power supply connections are shown in Figure 1. FIGURE 1. Power Supply and Ground Connections
3 Applications Information (continued)
The LHO086 may be used in the inverting mode, however, the load in order to eliminate errors due to lead resistance.
- Input resistance is low at high gains (see gain chart for together at some point. See Figure 4.
input resistance at each gain).
- Each gain step gets a one subtracted from the non-invert-
- The first gain step (digital code of 000) cannot be used
1 HO085 uJ 5
FIGURE 6. Noise Measurement Circult FIGURE 3. LH0086 Inverting Gain Configuration > FIGURE 7. Settling Time Test Circuit
Vos Offset Voltage: The voltage that must be ap- Pp Power Dissipation: The power dissipated in the & plied to force the output to 0 volts. device with no load and with the analog as well | as the digital inputs at OV. 3s Ip input Bias Current: The current into Pin 7 with = the device connected in the non-inverting config- Vin Digital “1” Input Voltage: Minimum vottage re- | B uration. quired at the digital input to guarantee a high log- ic state. Rw Input Resistance: The ratio of the change in in- ic state put voltage to the change in input current on ei- ham ; ther input with the other grounded. Vit Digital “0” Input Voltage: The current into a dig- ital input at specified logic level. Vin Input Voltage Range: The voltage range for which the device is operational. AVos/AT Average input Offset Voltage Drift: The ratio ; of input offset voltage change from 25°C to either PSRR Power Supply Rejection Ratio: The ratio of the temperature extreme divided by the temperature specified change in supply voltage to the change range. in input offset voltage over this range. . , AAy/AT Average Gain Temperature Coefficient: The Av Wottage Gain: The ratio of output voltage change ratio in gain from 25°C to either temperature ex- input 9 ge Producing it. treme divided by the temperature range. Gain Error: The deviation in percent between the ; ideal voltage gain and the value obtained when Bw Bandwidth: The frequency at which the voltage the device is configured for that gain. gain is reduced to 3 dB below the low frequency value. Gain Non-Linearity: The deviation of the gain from a straight line drawn through the end-points PBW Power Bandwidth: Maximum frequency for expressed as a percent of full scale (10V for op- which the output swing is a large signal sine- eration with +15V supplies). For testing pur- wave without noticeable distortion. poses it is the difference between positive swing gain ov 1 tov) ar verage gan ve to io SR Slew Rate: The internally limited rate of change ond average den 9 9 ° in output voltage with a large amplitude step ge gain. function applied at the input. Vo Output Voltage Swing: The peak output voltage ; a swing referenced to ground into specified load. ts Settling Time: The time between the initiation of an input step function and the time when the out- losc) Output Short-Circuit Current: The current sup- put voltage has settled to within a specified error plied by the device with the output connected di- band of the final output voltage. rectly to ground. i ; Gain Switching Time: The time between the ini- | Ro Closed Loop Output Resistance: The ratio of tiation of a gain logic change and the time when | change in output voltage to change to output cur- the final gain switches are closed. It includes i rent at a specific gain. overdrive recovery time, but not settling to final i value. Vs Supply Voltage Range: The supply voltage for which the devic tional. range for which the device Is operational en Equivalent Input Noise Voltage: The rms or Is Supply Current: The current required from the peak noise voltage referred to the input (RT!) 3 supply to operate the device with no load and over a specified frequency band. with the analog as well as the digital inputs at OV. in Equivalent Input Noise Current: The rms or peak noise current referred to the input (RTI) over a specified frequency band 3-231