LM4890 National Semiconductor, LM4890 Datasheet
LM4890
Available stocks
Related parts for LM4890
LM4890 Summary of contents
Page 1
... The LM4890 contains advanced pop & click circuitry which eliminates noises which would otherwise occur during turn-on and turn-off transitions. The LM4890 is unity-gain stable and can be configured by external gain-setting resistors. Connection Diagrams 8 Bump micro SMD Top View ...
Page 2
... Connection Diagrams 9 Bump micro SMD Top View Order Number LM4890IBL, LM4890IBLX See NS Package Number BLA09AAB LLP Package Top View Order Number LM4890LD See NS Package Number LDA10B Mini Small Outline (MSOP) Package Top View Order Number LM4890MM See NS Package Number MUA08A Small Outline (SO) Package ...
Page 3
... Connection Diagrams 9 Bump micro SMD Top View Order Number LM4890ITL, LM4890ITLX See NS Package Number TLA09AAA Typical Application FIGURE 1. Typical Audio Amplifier Application Circuit (Continued) 200192C1 3 9 Bump micro SMD Marking 200192D0 Top View X - Date Code T - Die Traceability G - Boomer Family A8 - LM4890ITL 20019201 ...
Page 4
... A LM4890 Units Typical Limit (Limits) (Note 6) (Notes (max) 4 (max) 0.1 2.0 µA (max) 1.2 V(min) 0.4 V(max (max) 9.7 kΩ (max) 8 ...
Page 5
... V = 200mV sine p-p ripple Input Terminated with 10 ohms to ground )/θ or the number given in Absolute Maximum Ratings, whichever is lower. For the LM4890, see power derating A JA exceeds 6V (to a max then most of the excess current will flow through the ESD protection circuits ...
Page 6
External Components Description Components 1. R Inverting input resistance which sets the closed-loop gain in conjunction with R IN high pass filter with Input coupling capacitor which blocks the DC voltage at the amplifier’s input terminals. Also ...
Page 7
Typical Performance Characteristics THD+N vs Frequency 5V, 8Ω and PWR = 250mW THD+N vs Frequency @ V = 2.6V 8Ω, PWR = 100mW ...
Page 8
Typical Performance Characteristics THD+N vs Power Out @ 8Ω, 1kHz THD+N vs Power Out @ V = 2.6V 8Ω, 1kHz www.national.com (Continued ...
Page 9
Typical Performance Characteristics Power Supply Rejection Ratio (PSRR 5V 200mvp-p DD ripple R = 8Ω 10Ω Power Supply Rejection Ratio (PSRR 5V 200mvp-p DD ripple R = 8Ω, ...
Page 10
Typical Performance Characteristics Power Supply Rejection Ratio (PSRR 3V 200mvp-p, DD ripple R = 8Ω 10Ω Power Supply Rejection Ratio (PSRR 3V 200mvp-p, DD ripple R = 8Ω, ...
Page 11
Typical Performance Characteristics PSRR vs DC Output Voltage PSRR vs DC Output Voltage PSRR vs DC Output Voltage ...
Page 12
... DD 200192B4 V = 3V, Input Grounded = 10Ω, Output Load = 8Ω DD 200192A7 Top Trace = No Cap, Next Trace Down = 1µf Next Trace Down = 2µf, Bottom Trace = 4.7µf LM4890 vs LM4877 Power Supply Rejection Ratio 20019288 12 PSRR Distribution 217Hz, 200mvp-p, -30, +25, and +80˚C 200192B5 Power Supply Rejection Ration vs ...
Page 13
Typical Performance Characteristics Power Derating Curves (P DMAX Ambient Temperature in Degrees C Note 670mW for 5V, 8Ω) DMAX Power Derating - 9 bump µSMD (P Ambient Temperature in Degrees C Note 670mW for 5V, 8Ω) ...
Page 14
Typical Performance Characteristics Power Dissipation vs Output Power = 5V, 1kHz, 8Ω, THD ≤ 1. Power Dissipation vs Output Power V = 2.6V, 1kHz DD Supply Current vs Ambient Temperature www.national.com (Continued) Power Dissipation vs Output Power = ...
Page 15
Typical Performance Characteristics Max Die Temp bump microSMD) DMAX Output Offset Voltage Shutdown Hysterisis Voltage (Continued 20019286 200192B7 Shutdown Hysterisis Voltage 20019279 15 Max Die Temp (8 bump microSMD) DMAX 20019287 ...
Page 16
Typical Performance Characteristics Open Loop Frequency Response V = 5V, No Load DD Gain / Phase Response 5V, 8Ω Load LOAD Phase Margin vs C LOAD V = 5V, 8Ω Load DD Capacitance to gnd ...
Page 17
Typical Performance Characteristics Frequency Response vs Input Capacitor Size (Continued) Phase Margin and Limits vs Application Variables 22KΩ IN Wake Up Time ( 200192B6 20019254 17 20019298 Noise Floor 20019256 www.national.com ...
Page 18
... Audio Power Amplifier Design section. A bridge configuration, such as the one used in the LM4890, also creates a second advantage over single-ended amplifi- ers. Since the differential outputs, Vo1 and Vo2, are biased at half-supply, no net DC voltage exists across the load ...
Page 19
... Bypass capacitor the most critical component to mini- BYPASS mize turn-on pops since it determines how fast the LM4890 turns on. The slower the LM4890’s outputs ramp to their quiescent DC voltage (nominally 1/2V turn-on pop. Choosing C equal to 1.0µF along with a BYPASS small value (in the range of 0.1µ ...
Page 20
... This feedback capacitor creates a low pass filter that elimi- www.national.com With and f (Continued) VD 300kHz which is much smaller than the LM4890 GBWP of in con- 2.5MHz. This calculation shows that if a designer has a need IN to design an amplifier with a higher differential gain, the LM4890 can still be used without running into bandwidth limitations ...
Page 21
... Application Information DIFFERENTIAL AMPLIFIER CONFIGURATION FOR LM4890 REFERENCE DESIGN BOARD and LAYOUT - micro SMD (Continued) FIGURE 3. FIGURE 4. 21 20019229 20019225 www.national.com ...
Page 22
... Application Information LM4890 micro SMD BOARD ARTWORK Silk Screen Bottom Layer Inner Layer Ground www.national.com (Continued) 20019257 20019259 20019261 22 Top Layer 20019258 Inner Layer V DD 20019260 ...
Page 23
Application Information REFERENCE DESIGN BOARD and PCB LAYOUT GUIDELINES - MSOP & SO Boards (Continued) FIGURE 5. 23 20019268 www.national.com ...
Page 24
... Application Information LM4890 SO DEMO BOARD ARTWORK Silk Screen Top Layer Bottom Layer LM4890 MSOP DEMO BOARD ARTWORK Silk Screen www.national.com (Continued) 20019262 20019263 20019264 20019265 24 Top Layer 20019266 Bottom Layer 20019267 ...
Page 25
... Application Information Item Part Number 1 551011208-001 LM4890 Mono Reference Design Board 10 482911183-001 LM4890 Audio AMP 20 151911207-001 Tant Cap 1uF 16V 10 21 151911207-002 Cer Cap 0.39uF 50V Z5U 20% 1210 25 152911207-001 Tant Cap 1uF 16V 10 30 472911207-001 Res 20K Ohm 1/10W 5 35 210007039-002 Jumper Header Vertical Mount 2X1 0.100 2 ...
Page 26
... Pin 1 is established by lower left corner with respect to text orientation pins are numbered counterclockwise. 5. Reference JEDEC registration MO-211, variation BC 1.361 www.national.com inches (millimeters) unless otherwise noted 8-Bump micro SMD Order Number LM4890IBP, LM4890IBPX NS Package Number BPA08DDB ± ± 0. 1.361 0. 0.850 26 ± ...
Page 27
... Physical Dimensions inches (millimeters) unless otherwise noted (Continued 1.514 9-Bump micro SMD Order Number LM4890IBL, LM4890IBLX NS Package Number BLA09AAB ± ± 0. 1.514 0. 0.945 27 ± 0.10 www.national.com ...
Page 28
... Physical Dimensions www.national.com inches (millimeters) unless otherwise noted (Continued) MSOP Order Number LM4890MM NS Package Number MUA08A 28 ...
Page 29
... Physical Dimensions inches (millimeters) unless otherwise noted (Continued) SO Order Number LM4890M NS Package Number M08A 29 www.national.com ...
Page 30
... Physical Dimensions www.national.com inches (millimeters) unless otherwise noted (Continued) LLP Order Number LM4890LD NS Package Number LDA10B 30 ...
Page 31
... National does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and National reserves the right at any time without notice to change said circuitry and specifications. inches (millimeters) unless otherwise noted (Continued) 9-Bump micro SMD Order Number LM4890ITL, LM4890ITLX NS Package Number TLA09AAA ± ...