Datasheet

ManualsBrandsTEXAS INSTRUMENTS ManualsLinear ICsLinear IC - Op-amp Multi-purpose SOT 23 5

10 100 10k 100k

FREQUENCY (Hz)

100

VOLTAGE NOISE (nV/

Hz)

= 5.5V

= 2.5V

OUT

- R

= C

+ C

LMV796, LMV797

www.ti.com

SNOSAU9D –MARCH 2006–REVISED MARCH 2013

LMV796/LMV796Q/LMV797 17 MHz, Low Noise, CMOS Input, 1.8V Operational Amplifiers

Check for Samples: LMV796, LMV797

FEATURES

DESCRIPTION

The LMV796/LMV796Q (Single) and the LMV797

(Typical 5V Supply, Unless Otherwise Noted)

(Dual) low noise, CMOS input operational amplifiers

• Input Referred Voltage Noise 5.8 nV/√Hz

offer a low input voltage noise density of 5.8 nV/√Hz

• Input Bias Current 100 fA

while consuming only 1.15 mA (LMV796/LMV796Q)

of quiescent current. The LMV796/LMV796Q and

• Unity Gain Bandwidth 17 MHz

LMV797 are unity gain stable op amps and have gain

• Supply Current per Channel

bandwidth of 17 MHz. The LMV796/LMV796Q/

– LMV796/LMV796Q 1.15 mA

LMV797 have a supply voltage range of 1.8V to 5.5V

and can operate from a single supply. The

– LMV797 1.30 mA

LMV796/LMV796Q/LMV797 each feature a rail-to-rail

• Rail-to-Rail Output Swing

output stage capable of driving a 600Ω load and

– @ 10 kΩ Load 25 mV from Rail

sourcing as much as 60 mA of current.

– @ 2 kΩ Load 45 mV from Rail

The LMV796/LMV796Q family provides optimal

• Guaranteed 2.5V and 5.0V Performance

performance in low voltage and low noise systems. A

CMOS input stage, with typical input bias currents in

• Total Harmonic Distortion 0.01% @ 1kHz, 600Ω

the range of a few femtoAmperes, and an input

• Temperature Range −40°C to 125°C

common mode voltage range, which includes ground,

• LMV796Q is an Automotive Grade Product that

make the LMV796/LMV796Q and the LMV797 ideal

is AEC-Q100 Grade 1 Qualified and is

for low power sensor applications.

Manufactured on an Automotive Grade Flow.

The LMV796/LMV796Q/LMV797 are manufactured

using TI’s advanced VIP50 process. The LMV796/

APPLICATIONS

LMV796Q are offered in 5–pin SOT-23 package. The

LMV797 is offered in 8–pin VSSOP package.

• Photodiode Amplifiers

• Active Filters and Buffers

• Low Noise Signal Processing

• Medical Instrumentation

• Sensor Interface Applications

• Automotive

Typical Application

Figure 1. Photodiode Transimpedance Amplifier Figure 2. Input Referred Voltage Noise vs.

Frequency

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of

Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

2All trademarks are the property of their respective owners.

PRODUCTION DATA information is current as of publication date.

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.

Summary of content (29 pages)

PAGE 1
LMV796, LMV797 www.ti.com SNOSAU9D – MARCH 2006 – REVISED MARCH 2013 LMV796/LMV796Q/LMV797 17 MHz, Low Noise, CMOS Input, 1.8V Operational Amplifiers Check for Samples: LMV796, LMV797 FEATURES DESCRIPTION 1 (Typical 5V Supply, Unless Otherwise Noted) 2 • • • • • • • • • Input Referred Voltage Noise 5.8 nV/√Hz Input Bias Current 100 fA Unity Gain Bandwidth 17 MHz Supply Current per Channel – LMV796/LMV796Q 1.15 mA – LMV797 1.
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LMV796, LMV797 SNOSAU9D – MARCH 2006 – REVISED MARCH 2013 www.ti.com These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam during storage or handling to prevent electrostatic damage to the MOS gates. Absolute Maximum Ratings (1) (2) Human Body Model ESD Tolerance (3) 2000V Machine Model 200V Charge-Device Model 1000V VIN Differential ±0.3V Supply Voltage (V+ – V−) 6.0V Input/Output Pin Voltage V+ +0.3V, V− −0.
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LMV796, LMV797 www.ti.com SNOSAU9D – MARCH 2006 – REVISED MARCH 2013 2.5V Electrical Characteristics (continued) Unless otherwise specified, all limits are specified for TA = 25°C, V+ = 2.5V, V− = 0V, VCM = V+/2 = VO. Boldface limits apply at the temperature extremes. Symbol CMRR Min Typ 80 75 94 2.0V ≤ V ≤ 5.5V, VCM = 0V 80 75 100 1.8V ≤ V+ ≤ 5.5V, VCM = 0V 80 98 Parameter Common Mode Rejection Ratio Conditions 0V ≤ VCM ≤ 1.
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LMV796, LMV797 SNOSAU9D – MARCH 2006 – REVISED MARCH 2013 www.ti.com 5V Electrical Characteristics (continued) Unless otherwise specified, all limits are specified for TA = 25°C, V+ = 5V, V− = 0V, VCM = V+/2 = VO. Boldface limits apply at the temperature extremes. −40°C ≤ TA ≤ 85°C 0.1 1 25 −40°C ≤ TA ≤ 125°C 0.1 1 100 (4) (5) IB Input Bias Current VCM = 2.0V IOS Input Offset Current VCM = 2.0V (5) Common Mode Rejection Ratio 0V ≤ VCM ≤ 3.7V 80 75 100 2.0V ≤ V+ ≤ 5.
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LMV796, LMV797 www.ti.com SNOSAU9D – MARCH 2006 – REVISED MARCH 2013 Connection Diagram 5 1 + V OUT A -IN A V - 2 7 + + V OUT B 2 + +IN 8 1 - OUTPUT 3 +IN A 4 -IN V Figure 3. 5-Pin SOT-23 Top View - 3 4 +- 6 5 -IN B +IN B Figure 4.
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LMV796, LMV797 SNOSAU9D – MARCH 2006 – REVISED MARCH 2013 www.ti.com Typical Performance Characteristics Unless otherwise specified, TA = 25°C, V– = 0, V+ = Supply Voltage = 5V, VCM = V+/2. Supply Current vs. Supply Voltage (LMV796/LMV796Q) Supply Current vs. Supply Voltage (LMV797) 2 2 1.6 1.6 SUPPLY CURRENT (mA) SUPPLY CURRENT (mA) 125°C 125°C 25°C 1.2 0.8 -40°C 0.4 0 1.5 2.5 3.5 4.5 25°C 1.2 -40°C 0.8 0.4 0 1.5 5.5 6.0 2.5 3.5 + 4.5 5.5 6 + V (V) V (V) Figure 5.
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LMV796, LMV797 www.ti.com SNOSAU9D – MARCH 2006 – REVISED MARCH 2013 Typical Performance Characteristics (continued) Unless otherwise specified, TA = 25°C, V– = 0, V+ = Supply Voltage = 5V, VCM = V+/2. Slew Rate vs. Supply Voltage Input Bias Current vs. VCM 1.5 13 + V = 5V 1 12 -40°C FALLING 0 IBIAS (pA) SLEW RATE (V/Ps) 0.5 11 10 9 -0.5 25°C -1 -1.5 8 -2 RISING 7 -2.5 6 1.8 -3 2.3 2.8 3.3 3.8 4.3 4.8 0 5.3 5.5 1 2 + V (V) Figure 11. 4 Figure 12. Input Bias Current vs.
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LMV796, LMV797 SNOSAU9D – MARCH 2006 – REVISED MARCH 2013 www.ti.com Typical Performance Characteristics (continued) Unless otherwise specified, TA = 25°C, V– = 0, V+ = Supply Voltage = 5V, VCM = V+/2. Sinking Current vs. Output Voltage Positive Output Swing vs. Supply Voltage 40 30 RLOAD = 10 k: 35 VOUT FROM RAIL (mV) 125°C 25 ISINK (mA) 20 25°C 15 10 -40°C 5 125°C 25 25°C 20 -40°C 15 10 5 0 1.8 0 0 1 2 3 4 5 2.5 3.2 VOUT (V) V (V) Figure 17. Figure 18. 5.
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LMV796, LMV797 www.ti.com SNOSAU9D – MARCH 2006 – REVISED MARCH 2013 Typical Performance Characteristics (continued) Unless otherwise specified, TA = 25°C, V– = 0, V+ = Supply Voltage = 5V, VCM = V+/2. Negative Output Swing vs. Supply Voltage Time Domain Voltage Noise 120 VS = ±2.5V 125°C RLOAD = 600: VCM = 0.0V 25°C 80 400 nV/DIV VOUT FROM RAIL (mV) 100 -40°C 60 40 20 0 1.8 2.5 3.2 3.9 4.6 5.3 1S/DIV 6 + V (V) Figure 23. Figure 24. Input Referred Voltage Noise vs.
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LMV796, LMV797 SNOSAU9D – MARCH 2006 – REVISED MARCH 2013 www.ti.com Typical Performance Characteristics (continued) Unless otherwise specified, TA = 25°C, V– = 0, V+ = Supply Voltage = 5V, VCM = V+/2. THD+N vs. Frequency THD+N vs. Frequency 0.006 0.006 0.005 0.004 THD+N (%) 0.004 RL = 100 k: 0.003 0.002 V+ = 1.2V + 0.003 V = 2.5V - V = 2.5V 0.002 VO = 4 VPP AV = +2 - V = 0.6V 0.001 VO = 0.9 VPP 0.001 AV = +2 0 10 RL = 100 k: 100 1k 10k 0 10 100k 100 Figure 29.
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LMV796, LMV797 www.ti.com SNOSAU9D – MARCH 2006 – REVISED MARCH 2013 Typical Performance Characteristics (continued) Unless otherwise specified, TA = 25°C, V– = 0, V+ = Supply Voltage = 5V, VCM = V+/2. Large Signal Transient Response, AV = +1 10 mV/DIV 200 mV/DIV Small Signal Transient Response, AV = +1 INPUT = 20 mVPP INPUT = 1 VPP f = 200 kHz f = 1 MHz + + V = 2.5V V = 2.5V 800 ns/DIV Figure 35. Figure 36.
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LMV796, LMV797 SNOSAU9D – MARCH 2006 – REVISED MARCH 2013 www.ti.com Typical Performance Characteristics (continued) Unless otherwise specified, TA = 25°C, V– = 0, V+ = Supply Voltage = 5V, VCM = V+/2. Negative PSRR vs. Frequency -20 -20 -40 NEGATIVE PSRR (dB) POSITIVE PSRR (dB) Positive PSRR vs. Frequency 0 -40 -60 1.8V -80 -60 + V = 1.8V -80 -100 + V = 5.5V 5.5V -100 10 -120 10k 1k 100 1M 100k 10 10M 100 1k 10k 100k 1M 10M FREQUENCY (Hz) FREQUENCY (Hz) Figure 41.
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LMV796, LMV797 www.ti.com SNOSAU9D – MARCH 2006 – REVISED MARCH 2013 APPLICATION INFORMATION ADVANTAGES OF THE LMV796/LMV797 Wide Bandwidth at Low Supply Current The LMV796 and LMV797 are high performance op amps that provide a unity gain bandwidth of 17 MHz while drawing a low supply current of 1.15 mA. This makes them ideal for providing wideband amplification in portable applications.
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LMV796, LMV797 SNOSAU9D – MARCH 2006 – REVISED MARCH 2013 www.ti.com INPUT CAPACITANCE AND FEEDBACK CIRCUIT ELEMENTS The LMV796 family has a very low input bias current (100 fA) and a low 1/f noise corner frequency (400 Hz), which makes it ideal for sensor applications. However, to obtain this performance a large CMOS input stage is used, which adds to the input capacitance of the op amp, CIN.
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LMV796, LMV797 www.ti.com SNOSAU9D – MARCH 2006 – REVISED MARCH 2013 15 AV = -1 10 GAIN (dB) 5 0 -5 R1, R2 = 30 k: -10 R1, R2 = 10 k: -15 R1, R2 = 1 k: -20 -25 10k 100k 1M 10M 100M FREQUENCY (Hz) Figure 47. Gain Peaking Caused by Large R1, R2 A way of reducing the gain peaking is by adding a feedback capacitance CF in parallel with R2. This introduces another pole in the system and prevents the formation of pairs of complex conjugate poles which cause the gain to peak.
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LMV796, LMV797 SNOSAU9D – MARCH 2006 – REVISED MARCH 2013 www.ti.com CF R1 1 k: CC1 R2 10 k: + VIN CC2 - - + RB1 V + + - VOUT RB2 R2 = -10 R1 AV = - Figure 49. Inverting Audio Preamplifier + V RB1 CC2 + VIN RB2 - + - + R2 10 k: - VOUT CF R1 1 k: CC1 AV = 1 + R2 R1 = 11 Figure 50. Non-inverting Audio Preamplifier 25 CF = 10 pF 20 15 CF = 1 nF GAIN (dB) 10 CF = 100 pF 5 0 -5 -10 -15 -20 1 10 100 1k 10k 100k 1M FREQUENCY (Hz) Figure 51.
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LMV796, LMV797 www.ti.com SNOSAU9D – MARCH 2006 – REVISED MARCH 2013 Usually, a transimpedance amplifier is designed on the basis of the current source driving the input. A photodiode is a very common capacitive current source, which requires transimpedance gain for transforming its miniscule current into easily detectable voltages. The photodiode and the amplifier’s gain are selected with respect to the speed and accuracy required of the circuit.
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LMV796, LMV797 SNOSAU9D – MARCH 2006 – REVISED MARCH 2013 www.ti.com GAIN OP AMP OPEN LOOP GAIN fZ = fP = NOISE GAIN WITH NO CF 1 2S RFCIN NOISE GAIN WITH CF A0 2S RF(CIN+CF) fP fZ A0 FREQUENCY Figure 53. CF Selection for Stability Calculating CF from Equation 3 can sometimes return unreasonably small values (<1 pF), especially for high speed applications. In these cases, it is often more practical to use the circuit shown in Figure 54 in order to allow more reasonable values.
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LMV796, LMV797 www.ti.com SNOSAU9D – MARCH 2006 – REVISED MARCH 2013 130 120 CIN = 50 pF, CF = 1.5 pF GAIN (dB) 110 100 90 CIN = 100 pF, CF = 2 pF 80 70 CIN = 200 pF, CF = 3 pF 60 50 10k 100k 1M 10M FREQUENCY (Hz) Figure 55. Frequency Response for ATI = 470000 100 CIN = 50 pF, CF = 4.5 pF 95 90 GAIN (dB) 85 80 CIN = 100 pF, CF = 6 pF 75 70 CIN = 200 pF, CF = 9 pF 65 60 55 50 10k 100k 1M 10M FREQUENCY (Hz) Figure 56.
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LMV796, LMV797 SNOSAU9D – MARCH 2006 – REVISED MARCH 2013 www.ti.com 4.5 pF 47 k: 10 k: IIN 1 k: - CIN = 50 pF - 797A + 797B + 0.1 PF + VOUT - ATI = VOUT = 470,000 IIN Figure 57. 1.5 MHz Transimpedance Amplifier with ATI = 470000 120 110 GAIN (dB) 100 90 80 70 CIN = 50 pF CF = 4.5 pF 60 10k 100k 1M 10M FREQUENCY (Hz) Figure 58. 1.
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LMV796, LMV797 www.ti.
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PACKAGE OPTION ADDENDUM www.ti.
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PACKAGE OPTION ADDENDUM www.ti.com 7-Oct-2013 Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is provided. TI bases its knowledge and belief on information provided by third parties, and makes no representation or warranty as to the accuracy of such information. Efforts are underway to better integrate information from third parties.
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PACKAGE MATERIALS INFORMATION www.ti.com 23-Sep-2013 TAPE AND REEL INFORMATION *All dimensions are nominal Device Package Package Pins Type Drawing SPQ Reel Reel A0 Diameter Width (mm) (mm) W1 (mm) LMV796MF/NOPB SOT-23 DBV 5 1000 178.0 8.4 B0 (mm) K0 (mm) P1 (mm) W Pin1 (mm) Quadrant 3.2 3.2 1.4 4.0 8.0 Q3 LMV796MFX/NOPB SOT-23 DBV 5 3000 178.0 8.4 3.2 3.2 1.4 4.0 8.0 Q3 LMV796QMF/NOPB SOT-23 DBV 5 1000 178.0 8.4 3.2 3.2 1.4 4.0 8.
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PACKAGE MATERIALS INFORMATION www.ti.com 23-Sep-2013 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) LMV796MF/NOPB SOT-23 DBV 5 1000 210.0 185.0 35.0 LMV796MFX/NOPB SOT-23 DBV 5 3000 210.0 185.0 35.0 LMV796QMF/NOPB SOT-23 DBV 5 1000 210.0 185.0 35.0 LMV796QMFX/NOPB SOT-23 DBV 5 3000 210.0 185.0 35.0 LMV797MM/NOPB VSSOP DGK 8 1000 210.0 185.0 35.0 LMV797MMX/NOPB VSSOP DGK 8 3500 367.0 367.
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