TSH34 3MHz Single Supply Video Buffer with Low In/Out Rail Bandwidth: 3MHz Single supply operation down to 3V Low input & output rail Very low harmonic distortion Slew rate: 78V/µs Voltage input noise: 7nV/ Hz Specified for 15Ω and 1Ω loads Internal gain of 6dB Compatible with the PCB layout of a single op-amp Tested on 5V power supply Data min. and max. are tested during production Description The TSH34 is a single supply video buffer featuring an internal gain of 6dB and a large bandwidth of 3MHz for only 9.8mA of quiescent current. An advantage of this circuit is its input and output negative rail feature, which is very close to GND in single supply. This rail is tested and guaranteed during production at 6mV maximum from GND on a 15Ω load. This allows a good output swing which fits perfectly when driving a video signal on a 75Ω video line. Chapter 5 of this datasheet gives technical support when using the TSH34 as a driver for video DAC output on a video line. In particular, this chapter focuses on applying a video signal DC shift to avoid any clamping of the synchronization tip. The TSH34 is available in tiny SOT3-5 and SO8 plastic packages. Pin Connections (top view) OUT 1 GND NC 1 NC IN 3 GND 4 IN 3 Applications 4 SOT3-5 SO8 5 +VCC NC 8 7 6 5 NC +Vcc OUT NC High-end video systems High Definition TV (HDTV) Broadcast and graphic video Multimedia products Order Codes Part Number Temperature Range Package Packaging Marking TSH34ILT SOT3-5 Tape & Reel K36 TSH34ID -4 C to +85 C Tube TSH34I SO-8 TSH34IDT Tape & Reel TSH34I April 5 Revision 1/13
TSH34 Absolute Maximum Ratings 1 Absolute Maximum Ratings Table 1. Key parameters and their absolute maximum ratings Symbol Parameter Value Unit V CC Supply voltage 1 6 V V in Input Voltage Range -. to +3 V T oper Operating Free Air Temperature Range -4 to +85 C T std Storage Temperature -65 to +15 C T j Maximum Junction Temperature 15 C R thjc Thermal Resistance Junction to Case SOT3-5 SO8 8 75 C/W R thja Thermal Resistance Junction to Ambient Area SOT3-5 SO8 5 175 C/W P max. Maximum Power Dissipation (@Ta=5 C) for Tj=15 C SOT3-5 SO8 5 715 mw ESD CDM: Charged Device Model HBM: Human Body Model MM: Machine Model 1.5 kv kv V 1) All voltage values, except differential voltage, are with respect to network terminal. ) The magnitude of input and output voltage must never exceed V CC +.3V. Table. Operating conditions Symbol Parameter Value Unit V CC Power Supply Voltage 3 to 5.5 1 V Vicm Common Mode Input Voltage -.4 to 3 V 1) Tested in full production at V/5V single power supply /13
Electrical Characteristics TSH34 Electrical Characteristics Table 3. V CC = +5V, T amb = 5 C (unless otherwise specified) Symbol Parameter Test Condition Min. Typ. Max. Unit DC Performance Output Offset Voltage V 1 no Load, T amb -3-5 +3 OS -4 C < T amb < +85 C -6.8 Input Bias Current T amb, V icm =.6V 6 16 I ib -4 C < T amb < +85 C 7. PSR Power Supply Rejection Ratio V cc =mvp-p, F=1MHz log ( V cc / V out ) -9 db ICC Total Supply Current no Load, V in =1mV 9.8 1.8 ma G DC Voltage Gain RL = 15Ω 1.95.5 V/V Rin Input Resistance T amb 8 MΩ Cin Input Capacitance T amb 3. pf Dynamic Performance and Output Characteristics Bw -3dB Bandwidth Small Signal Vout=mVp V icm =.6V, RL = 15Ω Gain Flatness @.1dB Small Signal Vout=mVp V icm =.6V, RL = 15Ω FPBW Full Power Bandwidth V icm=.6v, V OUT = Vp-p, R L = 15Ω 1) Output Offset Voltage is determined from the following expression: V OUT =G.V IN +V OS 19 3 63 mv µa MHz 13 MHz Slew Rate Vicm=.6V, V SR OUT = Vp-p, 78 V/µs R L = 15Ω V OH High Level Output Voltage R L = 15Ω 3.7 3.9 V V OL Low Level Output Voltage R L = 15Ω 4 6 mv Output Short Circuit Current (Isource) T amb 1 ma I OUT -4 C < T amb < +85 C 9 Output Current Vout=Vp, T amb 45 87 ma Noise and Distortion en Equivalent Input Noise Voltage F = 1kHz 7 nv/ Hz in Equivalent Input Noise Current F = 1kHz 1.5 pa/ Hz HD HD3 nd Harmonic Distortion 3rd Harmonic Distortion V OUT = Vp-p, R L = 15Ω F= 1MHz, -85 dbc V OUT = 1Vp-p, R L = 15Ω F= 1MHz, -75 dbc 3/13
TSH34 Electrical Characteristics Figure 1. Frequency response Figure 4. Frequency response on capa-load Gain (db) 16 14 1 1 8 6 4 - -4-6 -8-1 -1 Load=1 or 15Ω -14 SO8 and SOT3-5 -16 1M 1M 1M Frequency Response (db) 1-1 C=1pF Riso=Ω C=pF Riso=Ω C=47pF Riso=15Ω C= Riso= Load=Riso + C//1kΩ (to ground) - 1M 1M 1M C=1pF Riso= Figure. Gain flatness - SOT3-5 Figure 5. Gain flatness - SO8 7, 7, 6,8 Load=15Ω 6,8 Load=15Ω 6,6 6,6 6,4 6,4 Gain (db) 6, 6, 5,8 Gain (db) 6, 6, 5,8 5,6 Load=1Ω 5,6 Load=1Ω 5,4 5,4 5, 5, 1M 1M 1M 5, 5, 1M 1M 1M Figure 3. Total input noise vs. frequency Figure 6. Positive and negative slew rate non-inverting input in short-circuit 3,,5 Load=1Ω or 15Ω Input Noise (nv/vhz) 1 Output Response (V), 1,5 1, SR+ 1,5 SR- 1 1k 1k 1k 1M 1M, -5ns -4ns -3ns -ns -1ns s 1ns ns 3ns 4ns 5ns Time (ns) 4/13
Electrical Characteristics TSH34 Figure 7. Distortion on 1Ω load Figure 1. Distortion on 15Ω load HD & HD3 (dbc) -3-35 -4-45 -5-55 -6-65 -7-75 -8-85 -9-95 HD3 (3MHz) HD (3MHz) HD3 (1MHz) HD (1MHz) Load=1Ω -1 1 3 4 Output Amplitude (Vp-p) Figure 8. Output lower rail vs. frequency HD & HD3 (dbc) -3-35 -4-45 -5-55 -6-65 -7-75 -8-85 HD3 (1MHz) HD (3MHz) HD3 (3MHz) -9 HD -95 (1MHz) Load=15Ω -1 1 3 4 Output Amplitude (Vp-p) Figure 11. Output voltage swing vs. Vcc 5 4 Load=1Ω or 15Ω 5 4 Vol (mv) 3 Vout max (Vp-p) 3 1 1 F=3MHz Load=1Ω or 15Ω 1k 1k 1M 1M 1M 3, 3,5 3,5 3,75 4, 4,5 4,5 4,75 5, Vcc (V) Figure 9. Output voltage swing vs. frequency Figure 1. Quiescent current vs. vcc 5 no load 4 15 Vout max. (Vp-p) 3 1 Icc (ma) 1 5 1M Load=1Ω or Load=15Ω 1M 1,5,,5 3, 3,5 4, 4,5 5, Vcc (V) 5/13
TSH34 Electrical Characteristics Figure 13. Isource Figure 16. Reverse isolation vs. frequency -1 - -3 +5V VOH without load - Isource (ma) -4-5 -6-7 -8 +3V V Isource V Gain (db) -4-6 -9-1 -11-1,,5 1, 1,5,,5 3, 3,5 4, 4,5 5, V (V) -8 Small Signal Load=1Ω -1 1M 1M 1M 1G Figure 14. Bandwidth vs. temperature Figure 17. Voltage gain vs. temperature Bw (MHz) 5 45 4 35 3 5 15 Load=15Ω 1-4 - 4 6 8 Gain (db),5,4,3,,1, 1,99 1,98 1,97 1,96 Output: short-circuit 1,95-4 - 4 6 8 Figure 15. Output offset vs. temperature Figure 18. Ibias vs. temperature 7, 6,5 Vos (mv) -1 - -3 I BIAS (µa) 6, 5,5 5, 4,5-4 Load=15Ω -5-4 - 4 6 8 4, 3,5 Load=15Ω 3, -4-4 6 8 6/13
Electrical Characteristics TSH34 Figure 19. Supply current vs. temperature 1 11 I CC (ma) 1 9 8 no Load 7-4 - 4 6 8 Figure. Output lower rail vs. temperature,1,8 Load=15Ω V OL (V),6,4,, -4-4 6 8 Figure 1. Output higher rail vs. temperature 4,5 4,5 V OH (V) 4, 3,75 Load=15Ω 3,5-4 - 4 6 8 7/13
TSH34 Evaluation Boards 3 Evaluation Boards An evaluation board kit optimized for high-speed operational amplifiers is available (order code: KITHSEVAL/STDL). The kit includes the following evaluation boards, as well as a CD-ROM containing datasheets, articles, application notes and a user manual: SOT3_SINGLE_HF BOARD: Board for the evaluation of a single high-speed op-amp in SOT3-5 package. SO8_SINGLE_HF: Board for the evaluation of a single high-speed op-amp in SO8 package. SO8_DUAL_HF: Board for the evaluation of a dual high-speed op-amp in SO8 package. SO8_S_MULTI: Board for the evaluation of a single high-speed op-amp in SO8 package in inverting and non-inverting configuration, dual and signle supply. SO14_TRIPLE: Board for the evaluation of a triple high-speed op-amp in SO14 package with video application considerations. Board material: layers FR4 (εr=4.6) epoxy 1.6mm copper thickness: 35µm Figure : Evaluation kit for high speed op-amps 8/13
Power Supply Considerations TSH34 4 Power Supply Considerations Correct power supply bypassing is very important for optimizing performance in high-frequency ranges. Bypass capacitors should be placed as close as possible to the IC pins to improve high-frequency bypassing. A capacitor greater than 1µF is necessary to minimize the distortion. For better quality bypassing, a capacitor of 1nF is added using the same implementation conditions. Bypass capacitors must be incorporated for both the negative and the positive supply. On the SO8_SINGLE_HF board, these capacitors are C8 and C6. Figure 3: Circuit for power supply bypassing +VCC + 1microF 1nF +VCC TSH34 GND 9/13
TSH34 Using the TSH34 to Drive Video Signals 5 Using the TSH34 to Drive Video Signals Figure 4. Implementation of the video driver on output video DACs Video DAC 1Vpp Reconstruction Filtering LPF +5V 6dB Volt Video Signal.5V 5mV time 75Ω Vpp Volt Video Signal 75Ω Cable 1.15V 15mV time 1Vpp 75Ω V OL (1MHz) = 18mV (Figure 8) To drive the video signal properly, the output of the driver must be at least equal to 5mV (assuming V OS and V OL variations). 1st solution: Set the video DAC -IRE output level to 15mV. White Level 1 IRE Black Level 3 IRE Image Content IRE 3mV 15mV 1Vp-p V Synchronization Tip nd solution: Implementation of a DC component in the input of the driver. 33uF Video DAC 1Vpp DC component =15mV Reconstruction Filtering LPF 1k Volt +5V 6dB Video Signal.5V 5mV 75Ω Vpp Volt time Video Signal 75Ω Cable 1.15V 15mV time 1Vpp 75Ω 1/13
Package Mechanical Data TSH34 6 Package Mechanical Data 6.1 SO-8 package SO-8 MECHANICAL DATA DIM. mm. inch MIN. TYP MAX. MIN. TYP. MAX. A 1.35 1.75.53.69 A1.1.5.4.1 A 1.1 1.65.43.65 B.33.51.13. C.19.5.7.1 D 4.8 5..189.197 E 3.8 4..15.157 e 1.7.5 H 5.8 6..8.44 h.5.5.1. L.4 1.7.16.5 k 8 (max.) ddd.1.4 163/C 11/13
TSH34 Package Mechanical Data 6. SOT3-5L (5-pin) package SOT3-5L MECHANICAL DATA DIM. mm. mils MIN. TYP MAX. MIN. TYP. MAX. A.9 1.45 35.4 57.1 A1..15. 5.9 A.9 1.3 35.4 51. b.35.5 13.7 19.7 C.9. 3.5 7.8 D.8 3. 11. 118.1 E.6 3. 1.3 118.1 E1 1.5 1.75 59. 68.8 e.95 37.4 e1 1.9 74.8 L.35.55 13.7 1.6 1/13
TSH34 7 Revision History Date Revision Description of Changes 1 Jan. 5 1 First release corresponding to Preliminary Data version of datasheet. 3 Mar. 5 Datasheet of mature, full-specification product. Information furnished is believed to be accurate and reliable. However, STMicroelectronics assumes no responsibility for the consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of STMicroelectronics. Specifications mentioned in this publication are subject to change without notice. This publication supersedes and replaces all information previously supplied. STMicroelectronics products are not authorized for use as critical components in life support devices or systems without express written approval of STMicroelectronics. 13/13 The ST logo is a registered trademark of STMicroelectronics All other names are the property of their respective owners 5 STMicroelectronics - All rights reserved STMicroelectronics group of companies Australia - Belgium - Brazil - Canada - China - Czech Republic - Finland - France - Germany - Hong Kong - India - Israel - Italy - Japan - Malaysia - Malta - Morocco - Singapore - Spain - Sweden - Switzerland - United Kingdom - United States of America www.st.com