STV1389AQ CABLE DRIVER FOR DIGITAL TRANSFER . . . . . 1 DIFFERENTIAL INPUT, 3 DIFFERENTIAL OUTPUTS SUFFICIENT DRIVE CAPABILITY FOR A 300m LENGTH COAXIAL CABLE STABILITY DUE TO MINIMAL WAVEFORM DISTORTION BIPOLAR SILICON MONOLITHIC IC APPLICATIONS DATA TRANSFER BETWEEN DIGITAL SIGNAL PROCESSING EQUIPMENT QFP32 (Plastic Package) ORDER CODE : STV1389AQ DESCRIPTION The STV1389AQ offers in a single-chip a complete IC driver for digital data transfer. November 1992 3A GND GND 2B N.C. GND5 GND4 24 23 22 21 20 19 18 17 3B 27 14 VEE N.C. 28 13 VEE GND 29 12 VEE GND 30 11 VEE N.C. 31 10 N.C. 1A 32 9 INX 1 2 3 4 5 6 7 8 N.C. N.C. INY 15 GND 26 GND GND7 GND 2A 1B 16 GND3 25 GND2 GND6 1389-01.EPS N.C. PIN CONNECTIONS 1/7 STV1389AQ PIN DESCRIPTION Pin Number Symbol Standard DC Voltage Equivalent Circuit Description GND 180 Ω 7 1mA 2k Ω 7 9 INY INX - 2.7V Input pin of the differential amplifier. Input executed after DC portion is cut off. 2k Ω 1mA 9 1389-02.EPS 180 Ω VEE GND 2/7 1A 1B 2A 2B 3A 3B 1k Ω - Collector of the emitter follower output Tr. Connect to GND. 1 2 17 18 25 26 - 2.7V 1mA VEE 32 3 16 20 23 27 Emitter of emitter follower output Tr. To use, connect pull-down resistor. (Even when only 1 side is used pull-down is executed In pairs.) Pairs 32 16 23 3 20 27 1389-01.TBL 32 3 16 20 23 27 GND2 GND3 GND4 GND5 GND6 GND7 1389-03.EPS 1 2 17 18 25 26 STV1389AQ BLOCK DIAGRAM N.C. 3A GND GND 2B N.C. 24 23 22 21 20 19 GND5 GND4 18 17 GND6 25 16 2A GND7 26 15 N.C. 1.6Vp-p When the below input is applied between INX and INY, in-phase 1.6Vp-p is output at 1A, 2A and 3A. In reversed phase, 1.6Vp-p is output at 1B, 2B and 3B. * Various output pins are connected as indicated below. -5V 3B 27 14 VEE Co-axial cable 0.1µF N.C. 28 13 VEE GND 29 12 VEE GND 30 11 VEE 150 Ω 75 Ω -5V BIAS GEN N.C. 31 10 N.C. 1A 32 9 INX 0.1µF 1 2 GND2 GND3 3 4 5 6 7 8 1B GND GND GND INY N.C. 0.6Vp-p 0.1µF 1389-04.EPS 0.6Vp-p ABSOLUTE MAXIMUM RATINGS Parameter VCC Supply Voltage Tstg Storage Temperature PD Allowable Power Dissipation Value Unit 7.0 V o - 65, + 150 C 500 mW Value Unit 1389-02.TBL Symbol Symbol Parameter VCC Supply Voltage 4.8 to 5.2 V Topr Operating Temperature - 20, + 75 o C 1389-03.TBL OPERATING CONDITIONS Bias Conditio ns V INY V INX SW ON Pin Voltage INY - - - Pin Voltage INX - - - A1-1 PIn Voltage 1A - - - B1-1 Pin Voltage 1B - - - Pin 32 Test of pin voltage Pin 3 A2-1 PIn Voltage 2A - - - Pin 16 B2-1 Pin Voltage 2B - - - Pin 3 Symbol Parameter V1 V2 Test Point Test Min. Typ. Max. Unit Pin 7 - 2.9 - 2.7 - 2.5 V PIn 9 - 2.9 - 2.7 - 2.5 V - 3.1 - 2.7 - 2.5 V - 3.1 - 2.7 - 2.5 V - 3.1 - 2.7 - 2.5 V - 3.1 - 2.7 - 2.5 V 3/7 1389-04.TBL ELECTRICAL CHARACTERISTICS STV1389AQ ELECTRICAL CHARACTERISTICS (TA = 25oC) SW ON Test Point Parameter A3-1 PIn Voltage 3A - - - Pin 23 B3-1 Pin Voltage 3B - - - Pin 27 IEE Current Power Supply - - - VEE A1-2 DC applied 1A V1 + 0.2 V2 - 0.2 B1-2 DC applied 1B ↓ ↓ A2-2 DC applied 2A ↓ ↓ B2-2 DC applied 2B ↓ ↓ A3-2 DC applied 3A ↓ ↓ B3-2 DC applied 3B ↓ ↓ V1-1 Amplitude 1A + 1B Calculation V2-1 Amplitude 2A + 2B Calculation V3-1 Amplitude 3A + 3B Calculation - Amplitude 1A/1B Calculation - Amplitude 2A/2B Calculation - Amplitude 3A/3B Calculation V INY V INX Test Test of pin voltage Current power supply at VEE Pin 32 Output DC voltage is Pin 3 tested when +0.2V is applied to INY and - 0.2V to INX. SW1 Pin 16 (A1-2) = Test value - (A1-1) SW2 Pin 20 (B1-2) = Test value - (B1-1) The difference with the previous pin voltage is Pin 23 recorded. Same for A2-2, Pin 27 B2-2, A3-2, B3-2 Min. Typ. Max. Unit - 3.1 - 2.7 - 2.5 V - 3.1 - 2.7 - 2.5 V - 77 mA - 143 0.31 0.39 0.47 V 0.47 0.39 0.31 V 0.31 0.39 0.47 V 0.47 0.39 0.31 V 0.31 0.39 0.47 V 0.47 0.39 0.31 V 0.65 0.75 0.85 V 0.65 0.75 0.85 V 0.65 0.75 0.85 V 0.85 1.0 1.15 - 0.85 1.0 1.15 - 0.85 1.0 1.15 - Pin 32 Output DC voltage is - 0.9 tested when - 0.4V is Pin 3 applied to INY and + 0.4V 0.6 to INX. Pin 16 0.9 SW1 (A1-3) = Test value - (A1-1) SW2 (B1-3) = Test value - (B1-1) Pin 20 The difference with the 0.6 previous pin voltage is Pin 23 recorded. Same for A2-3, - 0.9 B2-3, A3-3, B3-3 Pin 27 0.6 0.75 - 0.6 V 0.75 0.9 V 0.75 - 0.6 V A1-3 DC applied 1A’ V1 - 0.4 V1 + 0.4 B1-3 DC applied 1B’ ↓ ↓ A2-3 DC applied 2A’ ↓ ↓ B2-3 DC applied 2B’ ↓ ↓ A3-3 DC applied 3A’ ↓ ↓ B3-3 DC applied 3B’ ↓ ↓ V1-2 Amplitud’e 1A’ + 1B Calculation V2-2 Amplitude 2A’ + 2B’ Calculation V3-2 Amplitude 3A’ + 3B’ Calculation - Amplitude 1A’ + 1B’ Calculation - Amplitude 2A’ + 2B’ - (V1-1) = (A1-2) - (B1-2) Amplitude calculated from T10 with T15 as base, same for V2-1, V3-1. (A1-2) / (B1-2) 0.75 0.9 V 0.75 - 0.6 V 0.75 0.9 V 1.3 1.5 1.7 V 1.3 1.5 1.7 V 1.3 1.5 1.7 V (A1-3) / (B1-3) 0.85 1.0 1.15 V Calculation (A2-3) / (B2-3) 0.85 1.0 1.15 V Amplitude 3A’ + 3B’ Calculation (A3-3) / (B3-3) 0.85 1.0 1.15 V V1-3 Linearity 1 Calculation (V1-2) / (V1-1) 1.7 1.9 2.1 V V2-3 Linearity 2 Calculation (V2-2) / (V1-1) 1.7 1.9 2.1 V V3-3 Linearity 3 Calculation (V3-2) / (V1-1) 1.7 1.9 2.1 V 4/7 (V1-2) = (A1-3) + (B1-3) Amplitude calculated from T22 with T27 as base, same for V2-2, V3-2. 1389-05.TBL Bias Conditions Symbol STV1389AQ TEST CIRCUIT 150 Ω 24 23 150 Ω 22 21 20 3A 19 18 17 2B 150 Ω 25 16 2A 26 15 150 Ω 27 -5V 3B -5V 14 VEE 28 13 29 12 30 11 BIAS GEN 31 10 SW2 1A 150 Ω 32 9 1B INX B INY A 2 3 4 5 6 7 150 Ω V INX 8 SW1 1389-05.EPS 1 V INY DESCRIPTION OF OPERATION The STV1389AQ consists of 3 differential amplifier with a common input and a bias generator, and three differential outputs. Each amplifiers provides a 6dB gain and is configured as a differential output feeding the bases of a pair of current boosting on-chip emitter follower transistors. The differential input pins are internally biased and the input signal is ac-coupled to remove the D.C. component. Between the output pins of each differential amplifier and the coaxial cable, an R-C network is con- nected to remove D.C. component from the output and for impedance matching. The series resistor has a value of 68 to 75Ω to match a 75Ω coaxial cable. In this manner a signal almost identitical in level to the input signal is transferred to the coaxial cable. Optimum PCB layout and matching resistor value are chosen to obtain good eye pattern design at the input pins. This is necessary because the waveform distortion at the input pins is directly transferred to the output waveform. DC cut Matching resistor 0.1 µF 75 Ω STV1389AQ Matching resistor 0.1µF 150 Ω Signal source = 0.8Vpp 75 Ω 75 Ω Co-axial cable - 5V 0.1µF 150 Ω 0.1µF BIAS GEN 0.6V 6dB Differential amplifier 0.1 µF 75 Ω To the other 2 channels 75 Ω 1389-06.EPS DC cut 1.5V 5/7 6/7 1389-07.EPS Block A 75 Ω 0.1 µF 0.1 µF 150 Ω 32 31 2 3 4 5 6 7 75 Ω 0.1 µF -5V 150 Ω INY A -5V 2A INX B 17 14 15 16 8 0.1 µF -5V 220 Ω *R2 10 Ω *R1 10 Ω 10 / 16V Tantalum capacitor *R3 150 Ω 0.1 µF 0.1 µF -5V 220 Ω 4 3 Serial Encoder STV1601A Keep unused output pins (both collector an emitter) open. Even when only one output side is in use, connect both the pull-down resistance and the collector. V = 200mV/div H = 1ns/div Signal rate 270Mbps 75 Ω for terminatingpin Exampleof output waveform Since power consumptionis large, conceive a pattern takingdueconsideration of the radiationfrom the PCB. Keep the GND pin pattern as short as possible and provide sufficient GND. A weak GND will cause unstable operation The marked * resistor is altered through the PCB pattern. Adjustment is performed to obtain a good eye pattern at Pins 7 and 9. 9 10 11 1B 18 30 BIAS GEN 19 12 1 2B 20 STV1389AQ Top View 21 29 1A 22 13 3B 3A 23 Same as Block A 28 27 26 25 24 Same as Block A STV1389AQ TEST CIRCUIT STV1389AQ PACKAGE MECHANICAL DATA 32 PINS - PLASTIC QUAD FLAT PACK Dimensions in mm 9.0 7.0 0.2 0.3 0.1 24 1.5 0.35 0.15 0.15 17 25 16 8.0 9 1 0.8 0.3 0.15 0.10 0.1 8 0.12 M 0.127 0.1 0.05 0.2 0.1 0.50 PM-QFP32.EPS 32 0° - 10° Information furnished is believed to be accurate and reliable. However, SGS-THOMSON Microelectronics 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 licence is granted by implication or otherwise under any patent or patent rights of SGS-THOMSON Microelectronics. Specifications mentioned in this publication are subject to change without notice. This publication supersedes and replaces all information previously supplied. SGS-THOMSON Microelectronics products are not authorized for use as critical components in life support devices or systems without express written approval of SGS-THOMSON Microelectronics. 1994 SGS-THOMSON Microelectronics - All Rights Reserved Purchase of I2C Components of SGS-THOMSON Microelectronics, conveys a license under the Philips I2C Patent. Rights to use these components in a I2C system, is granted provided that the system conforms to the I2C Standard Specifications as defined by Philips. SGS-THOMSON Microelectronics GROUP OF COMPANIES Australia - Brazil - China - France - Germany - Hong Kong - Italy - Japan - Korea - Malaysia - Malta - Morocco The Netherlands - Singapore - Spain - Sweden - Switzerland - Taiwan - Thailand - United Kingdom - U.S.A. 7/7