1-Input/4-Output Video Distribution Amplifiers MAX4137/MAX4138

Transcription

1 -00; Rev 0; / EVALUATION KIT AVAILABLE General Description The / are -input/-output voltagefeedback amplifiers that combine high speed with fast switching for video distribution applications. The is internally set for a closed-loop gain of V/V, while the can be externally set for gains of V/V or greater. The achieves a -db bandwidth of MHz, with 0.dB gain flatness to 0MHz. The s -db bandwidth is 0MHz, with 0.dB gain flatness to 0MHz. Both devices deliver a 000V/µs slew rate, as well as exceptional full-power bandwidths of MHz and 0MHz, respectively. A ns channel switching time enables rapid multiplexing for picture-in-picture applications, yet maintains a high off-isolation of db and all-hostile crosstalk of -0dB (f = 0MHz). The / s on-board logic selects any combination of the four signal outputs. Each output is capable of swinging ±V and delivering up to ma of current. For applications that require a -input/-output distribution amplifier, see the MAX/MAX data sheet. Selector Guide -Input/-Output Features Fixed Gain of V/V () External Gain Set () High Speed: MHz -db Bandwidth () 0MHz -db Bandwidth () 000V/µs Slew Rate High Full-Power Bandwidths (VOUT = Vp-p): MHz () 0MHz () 0.dB Gain Flatness to 0MHz Low Differential Gain/Phase Error: 0.0%/0.0 High-Impedance Output Disable Ordering Information PART EWG EWG TEMP. RANGE -0 C to + C -0 C to + C P-PACKAGE Wide SO Wide SO / PART No. OF OUTPUTS GA (V/V) Applications Video Switching and Distribution High-Resolution RGB CRT Monitors High-Speed Analog Bus Drivers RF Signal Processing Composite Video Preamplifiers -db BANDWIDTH (MHz) MAX Fixed MAX 0 Fixed 0 Pin Configurations TOP VIEW VCCO OUT A OUT VEEO VEEO OUT A OUT 0 VCCO SEL SEL A 0 + VEEI A (RG) (RF) VCCI SEL SEL ( ) ARE FOR. SO Maxim Integrated Products For free samples & the latest literature: or phone

2 / -Input/-Output ABSOLUTE MAXIMUM RATGS Power-Supply Voltage (V CC to V EE)...V Voltage on Any Input Pin to...(v CC + 0.V) to (V EE - 0.V) Short-Circuit Duration to...continuous Continuous Power Dissipation (T A = +0 C) Wide SO (derate.mw/ C above +0 C)...W Operating Temperature Range EWG/EWG...-0 C to + C Storage Temperature Range...- C to +0 C Lead Temperature (soldering, 0sec) C Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. DC ELECTRICAL CHARACTERISTICS (V CC = +V, V EE = -V, T A = T M to T MAX, unless otherwise noted. Typical values are at T A = + C.) PARAMETER Input Offset Voltage Input Offset Voltage Match Between Channels Input Offset Voltage Drift Input Bias Current Common-Mode Input Resistance SYMBOL V OS TCV OS I B R (CM) V OUT = 0V, R L = 0Ω V OUT = 0V, R L = 0Ω V OUT = 0V, R L = V OUT = 0V, R L =, V = -V OS, either input CONDITIONS M TYP MAX UNITS mv mv µv/ C µa MΩ Common-Mode Input Capacitance C (CM), either input pf Input Voltage Noise e n f = MHz f = MHz to 00MHz nv/ Hz µv RMS Input Current Noise i n f = MHz f = MHz to 00MHz. 0 pa/ Hz na RMS Input Capacitance C pf Common-Mode Input Voltage Range V CM ±. V Common-Mode Rejection Ratio CMRR V CM = ±.V 0 db Power-Supply Rejection Ratio PSRR V S = ±.V to ±.V db Quiescent Supply Current I SY V = 0V All channels off All channels on ma Output Voltage Swing V OUT R L = 0Ω Positive Negative V Output Current Drive I OUT R L = 0Ω ma SEL High Threshold V IH.0 V SEL Low Threshold V IL 0. V SEL Input Current I SEL µa

3 -Input/-Output AC ELECTRICAL CHARACTERISTICS (V CC = +V, V EE = -V, A VCL = V/V, T A = T M to T MAX, unless otherwise noted. Typical values are at T A = C.) -db Bandwidth Full-Power Bandwidth 0.dB Bandwidth Slew Rate Settling Time Off Isolation PARAMETER Differential Gain Differential Phase All-Hostile Crosstalk Channel Switching Off Time Channel Switching On Time Digital Switching Feedthrough Spurious-Free Dynamic Range Output On-Resistance Output Off-Resistance Output On-Capacitance Output Off-Capacitance SYMBOL BW -db FPBW SR t s DG DP t OFF t ON SFDR R OUT R OUT C OUT(ON) C OUT(OFF) V OUT 0.V RMS, A VCL = V/V V OUT = Vp-p, A VCL = V/V A VCL = V/V -V V OUT +V -V V OUT +V, R L=0Ω, A VCL=V/V f =.MHz, A VCL = V/V f =.MHz, A VCL = V/V V = Vp-p, f = 0MHz V = Vp-p, f = 0MHz V = 0V DC f C = MHz, A VCL = V/V, V OUT = Vp-p, R L = 00Ω f = DC, A VCL = V/V f = DC, A VCL = V/V CONDITIONS to 0.% to 0.0% M TYP MAX ± UNITS MHz MHz MHz V/µs ns % degrees db db ns ns mv dbc Ω kω pf pf /

4 / -Input/-Output Typical Operating Characteristics (V CC = +V, V EE = -V, R L = 0Ω, T A = + C, unless otherwise noted.) GA (db) GA (db) ALL-HOSTILE CROSSTALK (db) k 0 00k k SMALL-SIGNAL GA vs. FREQUENCY (A VCL = +) M 0M 00M G LARGE-SIGNAL GA vs. FREQUENCY (A VCL = +) V OUT = Vp-p M 0M 00M G ALL-HOSTILE CROSSTALK vs. FREQUENCY -0 M 0M 00M / TOC-0 / TOC-0 / TOC- IMPEDANCE (Ω) GA (db) GA (db) 0 00k 0 00k k SMALL-SIGNAL GA vs. FREQUENCY (A VCL = +) M 0M 00M G LARGE-SIGNAL GA vs. FREQUENCY (A VCL = +) V OUT = Vp-p M 0M 00M G CLOSED-LOOP OUTPUT IMPEDANCE vs. FREQUENCY M 0M 00M / TOC-0 / TOC-0-0 GA (db) NOISE (nv/ Hz) GA (db) 0 00k k 00 0 SMALL-SIGNAL GA vs. FREQUENCY (A VCL = +0) M 0M 00M G OFF-ISOLATION vs. FREQUENCY M 0M 00M G PUT VOLTAGE NOISE vs. FREQUENCY 0 00 k 0k 00k M 0M / TOC-0 / TOC-0 -

5 VOLTAGE (00mV/div) OUT LARGE-SIGNAL PULSE RESPONSE (A VCL = +) TIME (0ns/div) -Input/-Output Typical Operating Characteristics (continued) (V CC = +V, V EE = -V, R L = 0Ω, T A = + C, unless otherwise noted.) -0 VOLTAGE (00mV/div) OUT LARGE-SIGNAL PULSE RESPONSE (A VCL = +) TIME (0ns/div) - / SMALL-SIGNAL PULSE RESPONSE (A VCL = +) SMALL-SIGNAL PULSE RESPONSE (A VCL = +) VOLTAGE (0mV/div) OUT - VOLTAGE (0mV/div) OUT - TIME (0ns/div) TIME (0ns/div) DIGITAL FEEDTHROUGH - SEL (V/div) OUT (mv/div) TIME (0ns/div)

6 / -Input/-Output Typical Operating Characteristics (continued) (V CC = +V, V EE = -V, R L = 0Ω, T A = + C, unless otherwise noted.) HARMONIC DISTORTION (dbc) HARMONIC DISTORTION vs. FREQUENCY (V O = Vp-p, R L = 00Ω) ND HARMONIC RD HARMONIC k M 0M 00M / TOC- HARMONIC DISTORTION (dbc) HARMONIC DISTORTION vs. FREQUENCY (G = +, V O = Vp-p, R L = 00Ω) ND HARMONIC RD HARMONIC K M 0M 00M / TOC- PHASE (deg) GA (%) A VCL = V/V R L = 0Ω DIFFERENTIAL GA AND PHASE 0 00 IRE A VCL = V/V R L = 0Ω 0 00 IRE / TOC- OUTPUT SWG (Vp-p) OUTPUT SWG vs. LOAD RESISTANCE LOAD RESISTANCE (Ω) / TOC- VOLTAGE (mv) PUT OFFSET VOLTAGE vs. TEMPERATURE TEMPERATURE ( C) / TOC-0 CURRENT (ma) 0 POWER SUPPLY CURRENT vs. TEMPERATURE TEMPERATURE ( C) / TOC- PUT BIAS CURRENT vs. TEMPERATURE /-TOC-.0. POSITIVE OUTPUT VOLTAGE SWG vs. TEMPERATURE / TOC NEGATIVE OUTPUT VOLTAGE SWG vs. TEMPERATURE / TOC- CURRENT (µa) VOLTAGE (V)... VOLTAGE (V) TEMPERATURE ( C) TEMPERATURE ( C) TEMPERATURE ( C)

7 -Input/-Output Pin Description P,,,,,,, NAME No Connect. Not internally connected. FUNCTION,, VCCO Positive Supply for Output Amplifiers. Connect to +V. OUT Output,,,,, A Analog Ground OUT Output,, VEEO Negative Supply for Output Amplifiers. Connect to -V. OUT Output 0 0 OUT Output SEL When low, enables output channel OUT. When high, disables output channel OUT. SEL When low, enables output channel OUT. When high, disables output channel OUT. VCCI Positive Supply for Input Amplifier. Connect to +V. RF Output of Input Amplifier RG Inverting Input VEEI Negative Supply for Input Amplifier. Connect to -V Noninverting Input SEL When low, enables output channel OUT. When high, disables output channel OUT. SEL When low, enables output channel OUT. When high, disables output channel OUT. / Detailed Description The / are -input/-output video distribution amplifiers. The is configured for a fixed gain of +, while the features external gain control (feedback) for closed-loop gains of V/V or greater. Each output provides sufficient current to drive five 0Ω loads. However, distortion will increase when driving multiple loads. The TTL/CMOS-compatible digital control (SEL_) enables or disables each output amplifier. When the SEL_ control input is low, the amplifier is enabled; when it is high, the amplifier is disabled and presents a high-impedance output. The enable/disable or disable/enable time is under ns, which is useful in multiplexing, pixel switching, or picture-in-picture applications. Each device has an input amplifier, which buffers the input from any switching glitches that may be taking place at the output stage, and provides a highimpedance, low-capacitance input. The separate input buffer allows a true high output impedance when an amplifier is disabled. The outputs are protected against short circuits to ground. However, power-dissipation limits preclude shorting all output channels to ground. See the Power- Dissipation Considerations section for details.

8 -Input/-Output / +V DC -V DC 0.µF * * 0.µF VCCO OUT OUT VEEO VEEO SW OUT SW OUT R F R G SEL SEL A + 0 VEEI 0.µF VIDEO -V DC +V DC * * 0.µF * OUT OUT 0 VCCO OUT OUT SW SW A VCCI SEL SEL 0.µF +V DC * TO TERMATE TRANSMISSION LE Figure. Typical Operating Circuit Applications Information Grounding, Bypassing, and PC Board Layout To obtain the / s full MHz bandwidth, Microstrip and Stripline techniques are recommended in most cases. To ensure the PC board does not degrade the amplifier s performance, design the board for a frequency greater than GHz. Even with very short traces, use these techniques at critical points, such as inputs and outputs. Whether you use a constant-impedance board or not, observe the following guidelines when designing the board: Do not use wire-wrap boards. They are too inductive. Do not use IC sockets. They increase parasitic capacitance and inductance. In general, surface-mount components have shorter leads and lower parasitic reactance, giving better high-frequency performance than through-hole components. The PC board should have at least two layers, with one side a signal layer and the other a ground plane. Keep signal lines as short and straight as possible. Do not make 0 turns; round all corners. The ground plane should be as free from voids as possible.

9 -Input/-Output +V DC -V DC +V DC 0.µF * * * * 0.µF 0.µF VCCO OUT A OUT VEEO VEEO OUT A OUT 0 VCCO SW OUT SW OUT OUT OUT SW SW SEL SEL A + 0 VEEI RG R F RF VCCI SEL SEL * 0.µF R G 0.µF VIDEO -V DC +V DC / * TO TERMATE TRANSMISSION LE Figure. Typical Operating Circuit Driving Capacitive Loads The / provide maximum AC performance with no output load capacitance. This is the case when they are driving a correctly terminated transmission line (i.e., a back-terminated cable). However, the / are capable of driving capacitive loads up to 0pF without oscillations, but with reduced AC performance. Driving large capacitive loads increases the chance of oscillations in most amplifier circuits. This is especially true for circuits with high loop gain, such as voltage followers. The amplifier s output resistance and the load capacitor combine to add a pole and excess phase to the loop response. If the frequency of this pole is low enough and phase margin is degraded sufficiently, oscillations may occur. A second problem when driving capacitive loads results from the amplifier s output impedance, which looks inductive at high frequencies. This inductance forms an L-C resonant circuit with the capacitive load, which causes peaking in the frequency response and degrades the amplifier s gain margin. The / drive capacitive loads up to 0pF without oscillation. However, some peaking (in the frequency domain) or ringing (in the time domain) may occur (Figure ).

10 -Input/-Output / CLOSED-LOOP GA (db) 0 C L = pf C L = 0pF C L = pf 0 0.M M 0M 00M G Figure. Effect of C LOAD on Frequency Response (without R ISO) V R ISO Figure. Capacitive-Load Driving Circuit C L R L V OUT To drive larger-capacitance loads or to reduce ringing, add an isolation resistor between the amplifier s output and the load, as shown in Figure. The value of R ISO depends on the circuit s gain and the capacitive load. Figure shows the optional isolation resistor (R ISO ) vs. capacitive load (C L ). At the higher capacitor values, the bandwidth is dominated by the RC network, formed by R ISO and C L. Power-Dissipation Considerations The / can drive up to four outputs simultaneously. Quiescent power dissipation is typically 0mW and 0mW maximum, respectively, with all channels enabled. The maximum package power dissipation is rated at 0mW. In a typical application, four outputs drive a standard video signal into a 0Ω load. The amount of power added to the quiescent dissipation is minimal and no special precautions are necessary. However, each output driving the maximum ma into 0Ω will cause a power-dissipation increase of approximately 00mW. Therefore, you should not allow more than three outputs to deliver that load simultaneously. Similarly, one output shorted to ground will cause a power-dissipation increase of 0mW. Only one output can be shorted to ground without violating the package power rating. RISOLATION (Ω) C LOAD (pf) Figure. Optimal Isolation Resistor (R ISO) vs. C LOAD In conclusion, during normal operation in a matchedload environment, the total power dissipation is well within the package s dissipation rating. The maximum power dissipation is violated only if multiple channels are driving the maximum current into minimum loads at the same time. 0

11 -Input/-Output SCM SCM CAMERA SUBCARRIER (SC) SCM SCM SCM SCM SEL SEL SEL SEL SEL OUT OUT OUT OUT OUT SYNC SYNC VIDEO MONITOR VIDEO MONITOR / CAMERA SUBCARRIER (SC) SEL SEL SEL OUT OUT OUT MONITOR PUTS VIDEO SCM SCM SYNC MONITOR M M SEL OUT COMPOSITE SYNC (FROM GENLOCK) SEL SEL SEL OUT OUT OUT SYNC VIDEO MONITOR M M Figure. Two Cameras to Four Monitors Distribution Amplifier

12 / -Input/-Output Chip Information TRANSISTOR COUNT: SUBSTRATE CONNECTED TO V EE Package Information e D B A A 0.0mm 0.00in. C L 0 - DIM A A B C E e H L M CHES 0.00 MAX MILLIMETERS M MAX E H Wide SO SMALL-OUTLE PACKAGE (0.00 in.) DIM D D D D D PS 0 CHES M MAX MILLIMETERS M MAX A Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. Maxim Integrated Products, 0 San Gabriel Drive, Sunnyvale, CA 0 (0) -00 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.