TOP VIEW. HD Recorders TSSOP

Transcription

1 9-446; Rev ; /8 EVALUATION KIT AVAILABLE Low-Cost, -Channel, HD/PS/SD/BP General Description The / integrated -channel video filters for high-definition (HD), progressive-scan (PS), standard-definition (SD), and bypass (BP) video include an output buffer with +6dB gain and are ideal for digital video disc (DVD) players, set-top box (STB) receivers, high-definition television (HDTV), digital video recorders (DVRs), and similar devices. The / video inputs feature a transparent clamp compatible with AC- and DC-coupled input signals and allow outputs to be directly coupled, eliminating the need for bulky coupling capacitors. The filter bandwidths are selectable to HD, PS, and SD. A BP mode is provided for 8p and highbandwidth RGB signals. Selectable input bias circuitry on 2 filter channels offers simple connection to bipolar video signals such as C, Pb, and Pr. The filters provide -db bandwidths of 9MHz (SD), 6MHz (PS), MHz (HD), and 6MHz (BP). The filters provide -db bandwidths of MHz (SD), MHz (PS), 4MHz (HD), and 6MHz (BP). Each channel includes an output buffer with +6dB gain that provides a full 2V P-P video signal into a Ω video load. The buffers drive either AC- or DC-coupled loads and assure a blanking level of below V after the backmatch resistor. The shutdown mode provided reduces device current to µa (typ). The offers a flat passband and the features +.8dB peaking to compensate for rolloff. The / operate from a V power supply and operate over the upper commercial ( C to +8 C) temperature range. The parts are offered in the 4-pin TSSOP package. Features Three Selectable 6th-Order 9MHz/6MHz/MHz (SD/PS/HD) Filters Bypass Mode for High Bandwidth Signals Transparent Input Clamp Output Buffers Drive a Standard Ω Video Load ±2kV HBM ESD Protection on Outputs AC- or DC-Coupled Inputs AC- or DC-Coupled Outputs +.8dB Peaking Passband Response () in SD, PS, and HD Modes Single +V Power Supply Lead-Free, 4-Pin TSSOP Package Ordering Information PART TEMP RANGE PIN-PACKAGE UUD+ C to +8 C 4 TSSOP UUD+ C to +8 C 4 TSSOP +Denotes a lead-free/rohs-compliant package. Pin Configuration / Cable and Satellite STB Receivers HDTV DVD Players Personal Video Recorders DVRs Applications TOP VIEW V CC FSEL Y/G_IN Pb/B_IN Pr/R_IN BIAS N.C. FSEL Y/G_OUT Pb/B_OUT Pr/R_OUT SHDN Video-On-Demand N.C. 8 GND HD Recorders TSSOP Typical Operating Circuit appears at end of data sheet. Maxim Integrated Products For pricing, delivery, and ordering information, please contact Maxim Direct at , or visit Maxim s website at

2 / ABSOLUTE MAXIMUM RATINGS V CC to GND...-.V to +6V All Other Pins to GND...-.V to the lower of (V CC +.V) and +6V Continuous Power Dissipation (T A = + C) 4-Pin TSSOP (derate mw/ C above + C) mW Maximum Current into Any Pin Except V CC and GND...±mA ELECTRICAL CHARACTERISTICS Operating Temperature Range.... C to +8 C Storage Temperature Range...-6 C to + C Lead Temperature (soldering, s)...+ C Junction Temperature...+ 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. (V CC = +V, R LOAD = Ω to GND, C IN =.µf, T A = C to +8 C, all frequency responses are relative to khz, unless otherwise noted.) (Note ) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS DC CHARACTERISTICS Supply Current I CC No load 24 ma Supply Voltage Range V DD V Input Voltage Range V IN Referenced to GND if DC-coupled.4 V BIAS = high Power-Down Current I PD BIAS = low µa Digital Input High Voltage V IH 2. V Digital Input Low Voltage V IL.8 V STANDARD-DEFINITION VIDEO, T A = +2 C db Bandwidth f db, T A = +2 C 8.6 MHz 9. -db Bandwidth f db MHz Stopband Attenuation A SB f = 2MHz 48 db Low-Frequency Gain A V No load db Differential Gain dg All channels. % Differential Phase dφ All channels. Degrees Total Harmonic Distortion THD V OUT =.4V P-P, f = MHz, all channels -6 db Signal-to-Noise Ratio SNR 2V P-P signal to RMS noise, f = khz to 4.2MHz db Group Delay t G f = 4.MHz 9 ns Power-Supply Rejection Ratio PSRR DC, all channels db 2

3 ELECTRICAL CHARACTERISTICS (continued) (V CC = +V, R LOAD = Ω to GND, C IN =.µf, T A = C to +8 C, all frequency responses are relative to khz, unless otherwise noted.) (Note ) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS PROGRESSIVE-SCAN VIDEO, T A = +2 C 9. -db Bandwidth f db, T A = +2 C 4 6 -db Bandwidth f db Stopband Attenuation A SB f = 4MHz 44 db Low-Frequency Gain A V db Total Harmonic Distortion THD V OUT =.4V P-P, f = MHz - db Signal-to-Noise Ratio SNR 2V P-P signal to RMS noise, f = khz to MHz MHz MHz 66 db Group Delay t G f = MHz 4 ns HIGH-DEFINITION VIDEO, T A = +2 C 2 -db Bandwidth f db, T A = +2 C 22 MHz / -db Bandwidth f db 4 f =.2MHz 6. Stopband Attenuation A SB f = 44.2MHz 4. f = 4.2MHz 4 MHz db Low-Frequency Gain A V db Total Harmonic Distortion Signal-to-Noise Ratio THD SNR Note : All devices are % production tested at T A = +2 C. Note 2: Output AC-coupled with 22µF into Ω to GND. V OUT =.4V P-P, f = MHz - V OUT =.4V P-P, f = MHz - V OUT =.4V P-P, f = 22MHz -4 2V P-P signal to RMS noise, f = khz to MHz db 6 db Group Delay t G f = 2MHz 2 ns BYPASS VIDEO (Note 2) -db Bandwidth f db 6 MHz Low-Frequency Gain A V db Total Harmonic Distortion THD V OUT =.4V P-P, f = 22MHz -4 db Signal-to-Noise Ratio SNR 2V P-P signal to RMS noise, f = khz to MHz 6 db

4 / Typical Operating Characteristics (V CC = V, R L = Ω to GND, output DC-coupled, T A = +2 C, unless otherwise noted.) SD FREQUENCY RESPONSE -6 SD PASSBAND RESPONSE toc toc4 - SD PASSBAND RESPONSE PS FREQUENCY RESPONSE toc2 toc SD FREQUENCY RESPONSE -6 PS PASSBAND RESPONSE toc toc PS FREQUENCY RESPONSE toc PS PASSBAND RESPONSE toc8 HD FREQUENCY RESPONSE toc

5 Typical Operating Characteristics (continued) (V CC = V, R L = Ω to GND, output DC-coupled, T A = +2 C, unless otherwise noted.) - HD PASSBAND RESPONSE BP FREQUENCY RESPONSE toc toc HD FREQUENCY RESPONSE -6 BP PASSBAND RESPONSE toc toc4 - HD PASSBAND RESPONSE BP FREQUENCY RESPONSE toc2 toc / BP PASSBAND RESPONSE toc6 2 8 SD GROUP DELAY vs. FREQUENCY toc 2 8 SD GROUP DELAY vs. FREQUENCY toc

6 / Typical Operating Characteristics (continued) (V CC = V, R L = Ω to GND, output DC-coupled, T A = +2 C, unless otherwise noted.) PS GROUP DELAY vs. FREQUENCY HD GROUP DELAY vs. FREQUENCY toc9 toc PS GROUP DELAY vs. FREQUENCY BP GROUP DELAY vs. FREQUENCY toc2 toc HD GROUP DELAY vs. FREQUENCY BP GROUP DELAY vs. FREQUENCY toc2 toc DIFFERENTIAL GAIN (%) SD DIFFERENTIAL GAIN, NTSC toc2 DIFFERENTIAL PHASE (deg) SD DIFFERENTIAL PHASE, NTSC toc26 DIFFERENTIAL GAIN (%) SD DIFFERENTIAL GAIN, NTSC toc STEP STEP STEP 6

7 Typical Operating Characteristics (continued) (V CC = V, R L = Ω to GND, output DC-coupled, T A = +2 C, unless otherwise noted.) DIFFERENTIAL PHASE (deg) SD DIFFERENTIAL PHASE, NTSC STEP toc28 CH SD 2T RESPONSE toc29 CH2 2ns/div CH: INPUT, 2mV/div CH2: OUTPUT AFTER BACKMATCH RESISTOR, 2mV/div IN OUT CH SD 2T RESPONSE toc CH2 2ns/div CH: INPUT, 2mV/div CH2: OUTPUT AFTER BACKMATCH RESISTOR, 2mV/div IN OUT / PIN NAME FUNCTION V CC Power-Supply Input 2 FSEL Frequency-Select Input. LSB for bandwidth selection. Y/G_IN Video Input Channel 4 Pb/B_IN Video Input Channel 2 Pr/R_IN Video Input Channel 6 BIAS Pin Description Bias Control Digital Input. Enables voltage bias for the Pb/B and Pr/R channels. Force BIAS low to enable voltage bias and disable the input clamps. Force BIAS high to disable voltage bias and enable the input clamps., 4 N.C. No Connection. Not internally connected. 8 GND Ground 9 SHDN Shutdown Digital Input. SHDN places the device into a powered-down state. Force SHDN low to enable shutdown. Force SHDN high for normal operation. Pr/R_OUT Video Output Channel Pb/B_OUT Video Output Channel 2 2 Y/G_OUT Video Output Channel FSEL Frequency Select Input. MSB for bandwidth selection.

8 / Detailed Description The / integrated filters offer channels of SD, PS, or HD video, and include a bypass mode useful for high-bandwidth 8p and RGB video signals. The 6th-order lowpass filters provide -db bandwidths of 9MHz (SD), 6MHz (PS), MHz (HD), and 6MHz (BP). The 6th-order lowpass filters provide -db bandwidths of MHz (SD), MHz (PS), 4MHz (HD), and 6MHz (BP). Two control inputs, FSEL and FSEL, select the filter mode for all filters (Table ). Input bias circuitry on 2 filter channels can be enabled through the BIAS input to offer simple connection to bipolar video signals such as C, Pb, and Pr. Shutdown mode reduces device current to µa (typ) and is enabled by forcing SHDN low. Figure shows a simplified block diagram of the /. The provides a flat passband response and the provides a +.8dB high-frequency boost at MHz (SD), 8.MHz (PS), and 2MHz (HD) to help with system rolloff. No frequency boost is included in bypass mode. Typical voltage waveforms are shown in Figures 2 and. Inputs Transparent Clamps All inputs feature transparent clamps to allow either ACor DC-coupling of the inputs. The clamp remains inactive while the input signal is above ground, offering true DC input coupling. When the signal goes below ground, as is the case when it is AC-coupled, the clamp sets the sync tip close to the ground level. connects to the input node when BIAS is forced low. Figures 4 and show how the bias network operates. DC-Coupled Inputs When the input is DC-coupled, the voltage must remain above zero, but not to exceed.4v (typ). AC-Coupling and BIAS When the input is AC-coupled, the transparent clamps are active and set the lowest point of the signal at ground. This is appropriate for unipolar signals such as CVBS, Y, R, G, or B, with sync pulses (Figure 4). Force BIAS high when coupling unipolar signals. For bipolar signals, such as Pb and Pr, a bias network is provided within the / for inputs Pb/B_IN and Pr/R_IN. Force BIAS low to connect the bias network to these inputs (Figure ). The internal network biases AC-coupled inputs to a fixed DC voltage, typically.9v, to ensure that the transparent clamp remains off. V CC Y/G_IN Pb/B_IN BIAS TRANSPARENT CLAMP TRANSPARENT CLAMP BIAS NETWORK 9MHz/6MHz/MHz/6MHz (MHz/MHz/4MHz/6MHz) 9MHz/6MHz/MHz/6MHz (MHz/MHz/4MHz/6MHz) 6dB 6dB Y/G_OUT Pb/B_OUT Input Coupling The choice of AC- or DC-coupling the input depends on the video source. Many s have a current output and are terminated to ground with a resistor; such signals are conveniently DC-coupled. Use AC-coupling when the DC level of the video signal is unknown or outside the specified input range of the /, such as SCART or V CC -terminated outputs. A bias network within 2 channels of the /, for use with bipolar signals, Pr/R_IN SHDN FSEL FSEL GND TRANSPARENT CLAMP Figure. Block Diagram 9MHz/6MHz/MHz/6MHz (MHz/MHz/4MHz/6MHz) 6dB Pr/R_OUT Table. Frequency-Selection Truth Table CONTROL INPUTS FILTER -db FSEL FSEL OPERATING MODE 9 Standard definition 6 Progressive scan 4 High definition 6 6 Bypass 8

9 .V INPUT SIGNAL.V.V SD SYNC SIGNAL NOT SHOWN FOR CLARITY. INPUT OUTPUT 2.V.V.V OUTPUT SIGNAL / Figure 2. Typical AC-Coupled Signal 2.9V OUTPUT SIGNAL.2V INPUT OUTPUT INPUT SIGNAL.9V.2V.2V.V SD SYNC SIGNAL NOT SHOWN FOR CLARITY..9V Figure. Typical DC-Coupled Signal 9

10 / ENCODER.µF.µF Pb/B_IN V CC BIAS Pr/R_IN V CC.9V.9V Figure 4. Simple AC-Coupling and BIAS Control for Unipolar Signals (CVBS, Y, R, G, B) ENCODER Pb/B_IN.µF V CC BIAS.9V.9V Pr/R_IN.µF Figure. AC-Coupling and BIAS Control for Bipolar Signals (C, Pb, Pr)

11 Filters The filter characteristic provides excellent time-domain response with low overshoot and guarantees minimal attenuation in the passband. The filters offer a small gain peaking response to counter system rolloff. Select filter frequency with inputs FSEL and FSEL, as shown in Table. Standard-Definition (SD) Filters The SD filters have a 9MHz (typ) -db frequency, while the SD filters offer a MHz (typ) -db frequency and a +.8dB high-frequency boost at MHz (typ). Both devices have a stopband attenuation of +48dB (typ) at 2MHz. Progressive-Scan (PS) Filters The PS filters have a 6MHz (typ) -db frequency, while the PS filters offer a MHz (typ) -db frequency and a +.8dB high-frequency boost at 8.MHz (typ). Both devices have a stopband attenuation of +44dB (typ) at 4MHz. High-Definition (HD) Filters The HD filters have a MHz (typ) -db frequency, while the HD filters offer a 4MHz (typ) -db frequency and a +.8dB high-frequency boost at 2MHz (typ). Both devices have a stopband attenuation of +4dB (typ) at 4.2MHz. Bypassing the Filters The / filter bypass circuitry offers a 6MHz (typ) -db frequency. Bypassed filters offer no gain peaking. Output Buffer The / feature output buffers with +6dB gain that drive a standard Ω video load at 2V P-P. A typical load consists of a Ω backmatch resistor, an optional 22µF or larger coupling capacitor, and a Ω termination resistor. An offset of mv is added at the output. The offset ensures that the blanking level on the output is less than V after the backmatch resistor, thus meeting digital TV specifications allowing the devices to drive video loads directly without using costly AC-coupling capacitors. The basic output voltage equation of all filters is: VOUT = (2 x VIN) +.V Typical voltage waveforms are shown in Figures 2 and. Shutdown Forcing digital input SHDN low places the / into low-power shutdown mode. In shutdown, the device consumes only µa (typ), and the outputs are internally connected to GND through.8kω resistors. In shutdown, the input clamps are disabled and the inputs are internally connected to GND through kω resistors. When shutdown is forced low while BIAS is low, the bias network remains active, but the bias voltage changes from its nominal.9v to.4v (typ). Applications Information Output Considerations DC- or AC-couple the / outputs. These devices, with +6dB gain, are typically connected to a Ω series backmatch resistor followed by a video cable. Choose an AC-coupling capacitor value that ensures that the lowest frequency content in the video signal is passed and the field-time distortion is kept within desired limits when using an AC connection. The selection of this value is a function of the input impedance, and more importantly, the input leakage of the circuit being driven. Common industry practice is to use a 22µF or larger capacitor. The / outputs are fully protected against short circuits to ground. The short-circuit protection circuitry limits the output current to ma (typ) per output. Shorting more than one output to ground simultaneously may exceed the maximum package power dissipation. PCB Layout Recommendations Connect the power and ground traces to large copper areas to enhance power dissipation. Bypass V CC to GND with.µf and.µf capacitors. Place the.µf capacitor closest to V CC. Use surface-mount capacitors for their low inductance. Place traces carrying video signals appropriately to avoid mutual coupling. When inputs are AC-coupled, place the capacitors as close as possible to the device and keep traces short to minimize parasitic capacitance and inductance. Refer to the / evaluation kit data sheet for PCB layout. PROCESS: BiCMOS Chip Information /

12 / Ω Ω +V.µF Y/G_IN Pb/B_IN BIAS SHDN V CC.µF AC-COUPLING CAPACITORS ARE OPTIONAL. Ω VIDEO Ω 22µF CABLE Y/G_OUT Pb/B_OUT Typical Operating Circuit Ω 22µF Ω Ω Pr/R_IN Pr/R_OUT Ω 22µF Ω FSEL Ω FSEL GND Package Information For the latest package outline information and land patterns, go to PACKAGE TYPE PACKAGE CODE DOCUMENT NO. 4 TSSOP U 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. 2 Maxim Integrated Products, 2 San Gabriel Drive, Sunnyvale, CA Maxim Integrated Products is a registered trademark of Maxim Integrated Products, Inc.

13 Mouser Electronics Authorized Distributor Click to View Pricing, Inventory, Delivery & Lifecycle Information: Maxim Integrated: UUD+ UUD+T UUD+ UUD+T