.V,.23µA/ch, Ultralow Power, Rail-to-Rail Input/Output Single/Dual/Quad CMOS Operational Amplifier FEATURES (V + =V) Supply Current NJU77/NJU77.29µA typ..23µa/ch typ. Operating Voltage.V to.v Input Offset Voltage NJU77/NJU77.mV max. NJU772.3mV max. NJU77.mV max. Input Offset Voltage Drift.6µV/ C typ. Input Bias Current pa max. Unity Gain Frequency.kHz Slew Rate.7V/ms Rail-to-Rail Input/Output RF Noise Immunity CMOS Technology Package NJU77 SOT-23- NJU77 NJU772 NJU77 SC-88A, SOT-23- SOP8 JEDEC mil MSOP8 (TVSP)* *JEDEC MO-87-DA / thin type DFN8-U(ESON8-U) APPLICATIONS Battery powered Instruments Micro power oxygen sensor and gas sensor Power line monitoring Micropower current sensing Healthcare instruments SSOP DESCRIPTION The NJU77/NJU77/ is single/dual/quad ultralow power 3nW/ch operational amplifiers designed to extend battery life and performance for portable applications. The operating voltage range of.v to.v and supply current of.29ua(single),.23ua/ch(dual/quad) typical, with stable over temperature and input voltage change make them ideal for micropower oxygen sensors, gas sensors and remote sensor applications. In addition to the ultralow power and low operating voltage, rail-to-rail input and output, input offset voltage of.mv(single),.3mv(dual),.mv(quad) maximum with.6uv/ C drift, input bias current of pa maximum and ability to drive 7pF loads, make the NJU77 series ideal when requiring excellent performance in battery powered applications. NJU77 series are specified normal grade (NJU77x) and A-Grade (NJU77xA). A-Grade is guaranteed lower offset voltage and supply voltage from - to + C than the normal grade. The NJU77 is available in the -pin SOT-23 package. NJU77 is available in the -pin SOT-23 and SC-88A package. NJU77 and NJU77 have difference pin function (see pin configuration). The NJU772 is available in the 8-pin SOP8: JEDEC mil, MSOP8 (TVSP8): JEDEC MO-87-DA / thin type and DFN(ESON) that is thin and 2mm square small packages. The NJU77 is available in -pin SSOP package. TYPICAL CHARACTERISTIC TYPICAL APPLICATION Supply Current per Amplifier [μa]..3.2. Supply Current per Amplifier vs. Temperature () G V =db, V COM =V + /2 V + =.V V + =.V V + =.8V Sensor Vin kω kω.8v MΩ V + =3V to 2V @ end of life Vout CR232: coin type battery 22mAh = 3years @circuit To ADC Vout=Vin x I SUPPLY=.23µA/c h - -2 2 7 2 db micropower sensor amplifier []
PRODUCT INFORMATION V IO max. at 2 C I SUPPLY max. at 2 C I B max. at 2 C.8mV.9μA - NJU77F3.mV.39μA pa NJU77AF3 PIN CONFIGURATION SC-88A SOT-23- SOP8 JEDEC mil. NJU77F NJU77F NJU77AF NJU77AF Package / Product Name MSOP8 (TVSP8) DFN8-U (ESON8-U) SSOP - - - - - - - - 2.mV.66μA - - - NJU772E NJU772RB NJU772KU -.3mV.76μA pa - - NJU772AE NJU772ARB NJU772AKU - 2.2mV.32μA - - - - - - NJU77V.mV.22μA pa - - - - - NJU77AV (Top View) (Top View) Pin Function OUTPUT V - 2 V + +INPUT V - 2 V + +INPUT 3 -INPUT -INPUT 3 OUTPUT Package Product Name SOT-23- SOT-23- SC-88A NJU77F NJU77F NJU77F3 NJU77AF NJU77AF NJU77AF3 (Top View) (Top View) A OUTPUT 8 V + A OUTPUT 8 V + Pin Function A -INPUT A +INPUT V - 2 3 7 6 B OUTPUT B -INPUT B +INPUT A -INPUT A +INPUT V - 2 3 Exposed Pad on Underside 7 6 B OUTPUT B -INPUT B +INPUT Connect to exposed pad to V- Package Product Name SOP8 JEDEC mil. MSOP8(TVSP8) DFN8-U(ESON8-U) NJU772E NJU772RB NJU772KU NJU772AE NJU772ARB NJU772AKU (Top View) A OUTPUT D OUTPUT A -INPUT 2 3 D -INPUT Pin Function A +INPUT V + 3 2 D +INPUT V - B +INPUT C +INPUT B -INPUT 6 9 C -INPUT B OUTPUT 7 8 C OUTPUT Package Product Name SSOP NJU77V NJU77AV [2]
ABSOLUTE MAXIMUM RATINGS PARAMETER SYMBOL RATING UNIT Supply Voltage V + - V - 7 V Differential Input Voltage () V ID ±7 (2) V Input Voltage V IN V - -.3 to V + +.3 V Power Dissipation (3) P D (2-layer) SOT23-39 SC-88A 28 SOP8 JEDEC mil. MSOP8 (TVSP8) DFN8-U(ESON8-U) 36 SSOP Operating Temperature Range T opr - to + C Storage Temperature Range T stg - to +2 C () Differential voltage is the voltage difference between +INPUT and -INPUT. (2) For supply voltage less than +7V, the absolute maximum rating is equal to the supply voltage. (3) Power dissipation is the power that can be consumed by the IC at, and is the typical measured value based on JEDEC condition. When using the IC over subtract the value [mw/ C]=P D/(T stg(max)-2) per temperature. 2-layer: EIA/JEDEC STANDARD Test board (76.2x.3x.6mm, 2layers, FR-) mounting mw 6 Power Dissipation vs. Temperature Power Dissipation P D [mw] 3 2 SSOP MSOP8 (TVSP8) SOP8 JEDEC mil SOT-23- DFN8-U(ESON8-U) SC-88A 2 6 8 2 RECOMMENDED OPERATING CONDITION () PARAMETER SYMBOL CONDITION MIN. TYP. MAX. UNIT Supply Voltage V + - V -. -. V [3]
ELECTRICAL CHARACTERISTICS (V + =V, V - =V, V COM =2.V, R L =kω to 2.V,, unless otherwise noted.) PARAMETER SYMBOL TEST CONDITION DC CHARACTERISTICS Supply Current (all channel) I SUPPLY No Signal NJU77xA NJU77x MIN. TYP. MAX. MIN. TYP. MAX. NJU77/NJU77 -.29.39 -.29.9 Ta=- C to C - -.39 - - - NJU772 -.6.66 -.6.76 Ta=- C to C - -.66 - - - NJU77 -.92.22 -.92.32 Input Offset Voltage V IO Ta=- C to C - -.22 - - - V COM=V NJU77/NJU77 -.3 -.3.8 Ta=- C to C - -.2 - - - NJU772 -.3.3 -.3 2. Ta=- C to C - -. - - - NJU77 -.3. -.3 2.2 Input Offset Voltage Drift Ta=- C to C - -.7 - - - V COM=V, Ta=- C to C NJU77/NJU77 -.6 7 -.6 - ΔV IO/ΔT NJU772 -.6 2 -.6 - NJU77 -.6 2 -.6 - Input Bias Current Input Offset Current Open-Loop Voltage Gain Common-Mode Rejection Ratio Supply Voltage Rejection Ratio Maximum Output Voltage Common-Mode Input Voltage Range AC CHARACTERISTICS Slew Rate I B I IO A V CMR SVR V OH V OL V ICM - - - Ta=- C to C - - - - - - - - Ta=- C to C - - - - - Vout=.V to.v 7-7 - Ta=- C to C 7 - - - - - V COM=V to V 6 8-6 8 - Ta=- C to C 6 - - - - - V + =.V to.v, V COM=V 7 9-7 9 - Ta=- C to C 7 - - - - - R L=kΩ to 2.V.9.9 -.9.9 - Ta=- C to C.9 - - - - - R L=kΩ to 2.V -.. -.. Ta=- C to C - -. - - - CMR 6dB - - Ta=- C to C - - - - Gv=dB, C L=2pF, V IN=Vpp NJU77/NJU77 SR -.8 - -.8 - -.7 - -.7 - unity-gain Frequency f T Gv=2dB, C L=2pF NJU77/NJU77 -. - -. - -. - -. - Phase Margin Φ M C L=2pF - 6 - - 6 - deg Gain Margin G M C L=2pF - 3 - - 3 - db Equivalent Input Noise Voltage V NI f=hz NJU77/NJU77-6 - - 6 - - 7 - - 7 - UNIT µa mv µv/deg pa pa db db db V V V V/ms khz nv/ Hz []
ELECTRICAL CHARACTERISTICS (V + =.8V, V - =V, V COM =.9V, R L =kω to.9v,, unless otherwise noted.) PARAMETER SYMBOL TEST CONDITION DC CHARACTERISTICS Supply Current (all channel) I SUPPLY No Signal NJU77xA NJU77x MIN. TYP. MAX. MIN. TYP. MAX. NJU77/NJU77 -.26.36 -.26.6 Ta=- C to C - -.36 - - - NJU772 -.2.62 -.2.72 Ta=- C to C - -.62 - - - NJU77 -.8.7 -.8.27 Input Offset Voltage V IO Ta=- C to C - -.7 - - - V COM=V NJU77/NJU77 -.3 -.3.8 Ta=- C to C - -.2 - - - NJU772 -.3.3 -.3 2. Ta=- C to C - -. - - - NJU77 -.3. -.3 2.2 Input Offset Voltage Drift Ta=- C to C - -.7 - - - V COM=V, Ta=- C to C NJU77/NJU77 -.6 7 -.6 - ΔV IO/ΔT NJU772 -.6 2 -.6 - NJU77 -.6 2 -.6 - Input Bias Current Input Offset Current Open-Loop Voltage Gain Common-Mode Rejection Ratio Supply Voltage Rejection Ratio Maximum Output Voltage Common-Mode Input Voltage Range AC CHARACTERISTICS Slew Rate I B I IO A V CMR SVR V OH V OL V ICM - - - Ta=- C to C - - - - - - - - Ta=- C to C - - - - - Vout=.V to.3v 7-7 - Ta=- C to C 7 - - - - - V COM=V to.8v 8-8 - Ta=- C to C - - - - - V + =.V to.v, V COM=V 7 9-7 9 - Ta=- C to C 7 - - - - - R L=kΩ to.9v.7.7 -.7.7 - Ta=- C to C.7 - - - - - R L=kΩ to.9v -.. -.. Ta=- C to C - -. - - - CMR db -.8 -.8 Ta=- C to C -.8 - - - Gv=dB, C L=2pF, V IN=Vpp NJU77/NJU77 SR -.7 - -.7 - -.6 - -.6 - Unity-Gain Frequency f T Gv=2dB, C L=2pF NJU77/NJU77 -. - -. - -.9 - -.9 - Phase Margin Φ M C L=2pF - 6 - - 6 - deg Gain Margin G M C L=2pF - 3 - - 3 - db Equivalent Input Noise Voltage V NI f=hz NJU77/NJU77-7 - - 7 - - 8 - - 8 - UNIT µa mv µv/deg pa pa db db db V V V V/ms khz nv/ Hz []
TYPICAL CHARACTERISTICS. Supply Current vs. Supply Voltage (NJU77/NJU77) G V =db, V COM =V + /2. Supply Current vs. Temperature (NJU77/NJU77) G V =db, V COM =V + /2 Supply Current [μa]..3.2 Ta= C Ta=- C Supply Current [μa]..3.2 V + =.V V + =.V V + =.8V.. 2 3 6 7 Supply Voltage V + [V] - -2 2 7 2 Supply Current per Amplifier vs. Supply Voltage () G V =db, V COM =V + /2.. Supply Current per Amplifier vs. Temperature () G V =db, V COM =V + /2 Supply Current per Amplifier [μa].3.2. Ta= C Ta=- C Supply Current per Amplifier [μa].3.2. V + =.V V + =.V V + =.8V 2 3 6 7 Supply Voltage [V] - -2 2 7 2. Input Offset Voltage vs. Temperature V + =.V, V COM =V, n=2. Input Offset Voltage vs. Temperature V + =.8V, V COM =V, n=2 Input Offset Voltage [mv]... -. -. Input Offset Voltage [mv]... -. -. -. - -2 2 7 2 -. - -2 2 7 2 [6]
TYPICAL CHARACTERISTICS 2% Input Offset Voltage Drift Distribution V + =.V, V COM =V, n=3 2% Input Offset Voltage Drift Distribution V + =.8V, V COM =V, n=3 2% 2% Percent of Amplifiers % % % Percent of Amplifiers % % % % - -3.2-2. -.6 -.8.8.6 2. 3.2 Input Offset Voltage Drift [μv/ C] % - -3.2-2. -.6 -.8.8.6 2. 3.2 Input Offset Voltage Drift [μv/ C]. Input Offset Voltage vs. Common-Mode Input Voltage V + =.V. Input Offset Voltage vs. Common-Mode Input Voltage V + =.8V Input Offset Voltage [mv]... -. -. Ta=- C Ta= C Input Offset Voltage [mv]... -. -. Ta=- C Ta= C -.. 2. 3.... Common-Mode Input Voltage [V] -..2..6.8.2..6.8 2 Common-Mode Input Voltage [V]. Input Offset Voltage vs. Supply Voltage V COM =V 2 Common Mode and Supply Voltage Rejection Ratio vs. Temperature Input Offset Voltage [mv]... -. -. Ta=- C Ta= C Common Mode and Supply Voltage Rejection Ratio [db] 9 8 7 SVR CMR(V + =.V) CMR(V + =.8V) -. 2 3 6 7 Supply Voltage V + [V] 6 - -2 2 7 2 [7]
TYPICAL CHARACTERISTICS. Maximum Output Voltage vs. Output Current V + =.V, G V =OPEN.8 Maximum Output Voltage vs. Output Current V + =.8V, G V =OPEN Maximum Output Voltage [V]. 3. 2.. I SOURCE I SINK Ta=- C Ta= C Ta= C Ta=- C Maximum Output Voltage [V].6..2..8.6..2 I SOURCE I SINK Ta=- C Ta= C Ta= C Ta=- C... Output Current [ma]... Output Current [ma] Voltage Gain [db] 2 9 8 7 Voltage Gain vs. Temperature V COM =V + /2, R L =kω to V + /2 V + =.V V + =.8V 6 - -2 2 7 2 Voltage Gain [db] 3 2 - -2-3 Gain Phase Voltage Gain/Phase vs. Frequency V + =.V, G V =2dB, C L =2pF C L =pf C L =7pF C L =pf C L =33pF C L =2pF -3-6 -9-2 - C L =33pF - C L =7pF - -8 k k Frequency [Hz] Phase [deg] Pulse Response V + =.V, G V =db, R L =kω to 2.V, Voltage Noise vs. Frequency V + =.V, G V =db, R L =kω, Voltage [.V/div] 3. 2. 2. C L =2pF C L =pf Equivalent Input Noise Voltage [nv/ Hz] 2 8 6 2 NJU77/NJU77 Time [2ms/div] k Frequency [Hz] [8]
APPLICATION NOTE Capacitive load The unity gain follower is the most sensitive configuration to capacitive loading. The combination of capacitive load placed directly on the output of an amplifier along with the output impedance of the amplifier creates a phase lag which in turn reduces the phase margin of the amplifier. If phase margin is significantly reduced, the response will be either underdamped or the amplifier will oscillate. The NJU77/NJU77/ can directly drive capacitive loads of up to 7pF without oscillating. To drive heavier capacitive loads, an isolation resistor, R ISO as shown Figure, should be used. R ISO improves the feedback loop s phase margin by making the output load resistive at higher frequencies. The larger the value of R ISO, the more stable the output voltage will be. However, larger values of R ISO result in reduced output swing, reduced output current drive and reduced frequency bandwidth. Figure2 shows R ISO values at unity gain follower without oscillating. After selecting R ISO for your circuit, double-check the resulting frequency response peaking and step response overshoot. Modify R ISO s value until the response is reasonable. Isolation Resistance vs. Capacitive Load G V =+, Ta=2ºC VIN RISO CL VOUT Isolation Resistance R ISO [KΩ] Stable Unstable. p n n n μ Capacitive Load C L [F] Figure. Isolating capacitive load Figure2. Isolation resistance to improve stability [9]
PACKAGE DIMENSIONS +..23-. 2 3.6±.7 2.±.2.3±.2.2±.2.2±..2±.2 2.±.2 - +..3 -.3 (.2) +.2.±..2-..9±. +..9-. Unit: mm SC-88A Package 2.9±.2 ~.9±.2 +.2.6 -..2MIN 2.8±.2.6 2 3.9±..6MAX +..-.3.±...MAX.±. Unit: mm SOT-23- Package []
PACKAGE DIMENSIONS.±.3 ~ º 8.27 +..2 -..±..2 M SOP8 JEDEC mil Package 2.9±. ~ 8 2.8±..±.2.±..6 +..27-.3.7±..MAX.8±.2 3.9±.2 6.±..7MAX..±..±. Unit: mm.2±..8. M.±. Unit: mm MSOP8 (TVSP8) JEDEC MO-87-DA / thin type Package []
PACKAGE DIMENSIONS Unit: mm DFN8-U(ESON8-U) Package +.3. -. ~ º 8.±.2 6.±.3 7.±..±.2.6.67MAX +..-. Unit: mm.22±... M.±. SSOP Package [CAUTION] The specifications on this databook are only given for information, without any guarantee as regards either mistakes or omissions. The application circuits in this databook are described only to show representative usages of the product and not intended for the guarantee or permission of any right including the industrial rights. [2]