Current Feedback Quad Operational Amplifier

www.DataSheet4U.com ZL40122 High Speed, Current Feedback Quad Operational Amplifier Data Sheet Features • • • • • • 450 MHz small signal bandwidth 1500 V/µs slew rate 5.2 mA/channel static supply current 65 mA output current 120 MHz gain flatness to +/- 0. 1dB 14 pin SOIC the ideal choice where a high density of high speed devices is required. The flat gain response to 120 MHz, 450 MHz small signal bandwidth and 1500 V/µs slew rate make the device an excellent solution for video applications such as driving video signals down significant cable lengths. Other applications which may take advantage of the ZL40122 superior dynamic performance features include low cost high order active filters and twisted pair driver/receivers. ZL40122/DCA ZL40122/DCB ZL40122DCF1 ZL40122DCE1 Ordering Information 14 lead SOIC 14 lead SOIC 14 lead SOIC* 14 lead SOIC* Tubes Tape & Reel Tape & Reel, Bake & Drypack Tubes, Bake & Drypack March 2006 *Pb Free Matte Tin -40°C to +85°C Applications • • • • Video switchers/routers Video line drivers Twisted pair driver/receiver Active filters Description The ZL40122 is a high speed, quad, current feedback operational amplifier offering high performance at a low cost. The device has a very high output current drive capability of 65 mA while requiring only 5.2 mA of static supply current. This feature makes the ZL40122 Out_1 1 14 Out_4 In_n_1 2 13 In_n_4 1 In_p_1 3 4 12 In_p_4 V+ 4 ZL40122 11 V- In_p_2 5 10 In_p_3 2 In_n_2 6 3 9 In_n_3 Out_2 7 8 Out_3 Figure 1 - Functional Block Diagram and Pin Connection 1 Zarlink Semiconductor Inc. Zarlink, ZL and the Zarlink Semiconductor logo are trademarks of Zarlink Semiconductor Inc. Copyright 2003-2006, Zarlink Semiconductor Inc. All Rights Reserved. ZL40122 Change Summary Data Sheet Changes from November 2004 Issue to March 2006 Issue. Page, section, figure and table numbers refer to this current issue. Page 1 Item Change Updated Ordering Information Application Notes Current Feedback Op Amps Current feedback op amps offer several advantages over voltage feedback amplifiers: • • • AC bandwidth not dependent on closed loop gain High Slew Rate Fast settling time The architecture of the current feedback opamp consists of a high impedance non-inverting input and a low impedance inverting input which is always feedback connected. The error current is amplified by a transimpedance amplifier which can be considered to have gain Z( f ) = Zo f 1+ j   f   o where Zo is the DC gain. It can be shown that the closed loop non-inverting gain is given by Vout = Vin Av  fR f  1+ j   fZ   o o f o Z o GBOL = Rf Rf where Av is the DC closed loop gain, Rf is the feedback resistor. The closed loop bandwidth is therefore given by BWCL = and for low values of closed loop gain Av depends only on the feedback resistor Rf and not the closed loop gain. Increasing the value of Rf • • • • • Increases closed loop stability Decreases loop gain Decreases bandwidth Reduces gain peaking Reduces overshoot Using a resistor value of Rf=510 Ω for Av=+2 V/V gives good stability and bandwidth. However since requirements for stability and bandwidth vary it may be worth experimentation to find the optimal Rf for a given application. 2 Zarlink Semiconductor Inc. ZL40122 Layout Considerations Data Sheet Correct high frequency operation requires a considered PCB layout as stray capacitances have a strong influence over high frequency operation for this de0ice. The Zarlink evaluation board serves as a good example layout that should be copied. The following guidelines should be followed: • • • Include 6.8 uF tantalum and 0.1 uF ceramic capacitors on both positive and negative supplies Remove the ground plane under and around the part, especially near the input and output pins to reduce parasitic capacitances Minimize all trace lengths to reduce series inductance 3 Zarlink Semiconductor Inc. ZL40122 Application Diagrams Vcc 6.8uF Data Sheet • • • Vin 0.1uF • ¼ ZL40122 • Vout Rin Rf • Ra • 0.1uF • 6.8uF Vee • Vout Rf = Av = 1 + Vin Ra Figure 2 - Non-inverting Gain Vcc 6.8uF • • • Rb 0.1uF ¼ ZL40122 • Vout Rf Vin • Ra • • 0.1uF Rin • 6.8uF Vee • Vout Rf = Av = − Vin Ra Figure 3 - Inverting Gain 4 Zarlink Semiconductor Inc. ZL40122 Absolute Maximum Ratings Parameter Symbol Min. Max. Data Sheet Units 1 2 Vin Differential Output Short Circuit Protection VIN VOS/C ±1.2 See Apps Note in this data sheet ±6.5 VV2 V+ V+ (see Note 3) V 3 4 5 6 Supply voltage Voltage at Input Pins Voltage at Output Pins EDS Protection (HBM Human Body Model) (see Note 2) Storage Temperature Latch-up test Supply transient test V+, VV(+IN), V(-IN) VO V V V kV 7 8 9 -55 +150 (see Note 4) (see Note 5) °C ±100 mA for 100 ms 20% pulse for 100 ms Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is intended to be functional, but specific performance is not guaranteed. For guaranteed specifications and the test conditions, see the Electrical Characteristics. Human body model, 1.5 kΩ in series with 100 pF. Machine model, 20 Ωin series with 100 pF. 0.8 kV between the pairs of +INA, -INA and +INB pins only. 2 kV between supply pins, OUTA or OUTB pins and any input pin. ±100 mA applied to input and output pins to force the device to go into "latch-up". The device passes this test to JEDEC spec 17. Positive and Negative supply transient testing increases the supplies by 20% for 100 ms. Note 2: Note 3: Note 4: Note 5: Operating Range Characteristic Min. Typ. Max. Units Comments Supply Voltage (Vcc) Operating Temperature (Ambient) Junction to Ambient resistance ±4.0 -40 Rth(j-a) 150 ±6.0 +85 V °C °C 4 layer FR4 board °C 4 layer FR4 board Junction to Case resistance Rth(j-c) 60 5 Zarlink Semiconductor Inc. ZL40122 Rload=100 Ω unless specified. Data Sheet Electrical Characteristics - Vcc=±5 V, Tamb=25C(typ.),Tamb=-40C to +85C(min-max), Av=+2V/V, Rf=510 Ω, Characteristic Conditions Typ 25C Min/ Max 25C Min/ Max –40 to +85C Units Test Type1 Frequency Domain Response -3 dB Bandwidth Av=+1; Vo < 0.5 Vp-p; Rf=1.5 kΩ Av=+2; Vo < 0.5 Vp-p; Rf=510 Ω Av=+2; Vo < 5 Vp-p; Rf=510 Ω 450 380 170 120 0.01 0.015 - - MHz MHz MHz MHz % deg. C C C C C C +/- 0.1 dB Flatness Differential Gain (NTSC) Differential Phase (NTSC) Time Domain Response Av=+2; Vo < 0.5 Vp-p; Rf=510 Ω Rload=150 Ω Rload=150 Ω Rise and Fall Time Vout=0.5 V Step Vout=5 V Step 1 2.8 6 4 1500 - - ns ns ns % V/µs C C C C C Settling Time to 0.1% Overshoot Slew Rate Noise and Distortion Vout=2 V Step Vout=0.5 V Step Vout=5 V Step 2nd Harmonic Distortion 3nd Harmonic Distortion Equivalent Input Noise Voltage Non-Inverting Current Inverting Current Static, DC Performance Vout=2 Vp-p, 1 MHz Vout=2 Vp-p, 1 MHz -84 -85 - - dBc dBc C C >1 MHz >1 MHz >1 MHz 5.5 1.3 11 - - nV pV pA Hz Hz C C C Hz Input Offset Voltage Average Drift Input Bias Current – Non-inverting Average Drift 2.7 2.6 - ±6.3 ±5.6 - ±7.7 15 ±6 6 mV µV/deg. C uA nA/deg. C A C A C 6 Zarlink Semiconductor Inc. ZL40122 Min/ Max 25C Min/ Max –40 to +85C Data Sheet Characteristic Conditions Typ 25C Units Test Type1 Input Bias Current – Inverting Average Drift Power Supply Rejection Ratio (+ve) Power Supply Rejection Ratio (-ve) Common Mode Rejection Ratio Supply Current (per Channel) Miscellaneous Performance 7.4 DC DC DC Quiescent 61 58 54 5.2 ±25 58 56 50 6.5 ±28 15 57 55 49 6.7 µA nA/deg. C dB dB dB mA A C A A A A Input Resistance (Non-inverting) Input Capacitance (Non-inverting) Common Mode Input Range Output Voltage Range Output Current (max) Output Resistance, Closed Loop DC Rload=100 Ω 8 1 ±2.4 ±2.8 65 90 ±2.2 ±2.7 - ±2.0 ±2.6 - MΩ C C A A C C pF V V mA mΩ Note: Test Types: (A) 100% tested at 25°C. Over temperature limits are set by characterization and simulation. (B) Limits set by characterization or simulation. (C) Typical value only for information. 7 Zarlink Semiconductor Inc. ZL40122 Typical Performance Characteristics unless otherwise specified. Data Sheet Tamb=25degC, Vsupply=± 5 V, Rload=100 Ω, Av=+2V/V, Rf=510 Ω, Non-Inverting Frequency Response 2 0 -2 Normalised Gain (dB) -4 Phase -6 -8 -10 -12 -14 1 10 Frequency (MHz) 100 Vo=0.5Vp-p Av =+4 Rf = 150 Av =+2 Rf = 510 0 -50 -100 -150 -200 1000 Av =+8 Rf = 150 Gain Av =+1 Rf = 1k 200 150 100 50 8 Zarlink Semiconductor Inc. Phase (deg.) ZL40122 Data Sheet Non-Inverting Frequency Response varying Rf 2 Rf=390 0 -2 Normalised Gain (dB) -4 -6 -8 -10 -12 -14 -16 -18 10 100 Frequency (MHz) 1000 Vo=0.5Vp-p Rf=700 Rf=510 Rf=250 Open Loop Transimpedance Gain and Phase 120 110 Transimpedance Gain 100 Transimpedance Phase 90 80 70 60 50 40 1.0E+03 -90 -120 -150 -180 -210 -240 1.0E+09 Transimpedance Gain 0 -30 -60 Transimpedance Phase 1.0E+04 1.0E+05 1.0E+06 Frequency (Hz) 1.0E+07 1.0E+08 9 Zarlink Semiconductor Inc. ZL40122 Data Sheet Large Signal Gain 0 -2 -4 Gain (dB) -6 -8 -10 -12 -14 -16 10 100 Frequency (MHz) 1000 Vo = 5V p-p Vo = 4V p-p Vo = 1V p-p Harmonic Distortion vs Frequency -40 Vo = 2V p-p 2nd & 3rd Harmonic Distortion (dBc) -50 -60 2nd Harmonic -70 -80 3rd Harmonic -90 -100 1 10 Frequency (MHz) 100 10 Zarlink Semiconductor Inc. ZL40122 Data Sheet CMRR 70 T = - 40 degC 60 Rejection Ration (dB) 50 40 30 20 10 0 1.0E+03 T = + 25 degC T = + 85 degC 1.0E+04 1.0E+05 1.0E+06 1.0E+07 1.0E+08 Frequency (Hz) PSRR +ve 80 T = - 40 degC 70 Rejection Ration (dB) 60 T = + 25 degC 50 40 30 20 10 0 1.0E+03 T = + 85 degC 1.0E+04 1.0E+05 1.0E+06 1.0E+07 1.0E+08 Frequency (Hz) 11 Zarlink Semiconductor Inc. ZL40122 Data Sheet PSRR -ve 70 T = - 40 degC 60 Rejection Ration (dB) 50 4