View SLOS257_1003049.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

THS6101 UPSTREAM CABLE DRIVER FOR DOCSIS-COMPLIANT CABLE COMMUNICATIONS
SLOS257 - AUGUST 2000
D
D D D
Low Noise and Distortion - Exceeds all DOCSIS Requirements - - 64 dB HD3 at 29.3 MHz, VO = 56 dBmV - 83 dBmV IP3 at 65MHz - - 47 dBmV Noise Level at Minimum Gain Wide Range of Output Power Levels - 62 dBmV RMS Output Power Drive - 54 dB Range of Programmable Gain - 6 dB Gain Steps Low Power Solution - 15 mW Disable-Mode Power Consumption - Power Consumption Scales With Gain Single-Supply 5 V Operation
THS6101 PWP PACKAGE (TOP VIEW)
GND RESET C_COMP GND BYP1 IN_P IN_M GND VC TX NC GND
1 2 3 4 5 6 7 8 9 10 11 12
24 23 22 21 20 19 18 17 16 15 14 13
OUT_P GND REF VCC RES_BIAS VDD DATAIN CLK EN VCC GND OUT_M
description
The THS6101 is a Class-A amplifier designed specifically for driving the upstream data path in Data Over Cable System Interface Specification (DOCSIS)-compliant cable modem applications. The DOCSIS places demanding constraints on the upstream drive amplifier, and the THS6101 is designed for full compliance with this industry standard. Using only a single 5-V power supply, the THS6101 meets all of the DOCSIS distortion requirements. Differential signal paths throughout the device maintain signal integrity. An external 2:1 balun transformer converts the differential output signal to a single-ended output signal.
NC - No internal connection
5V 2:1 THS6101 300 5V 75 COAX
THS6101 Application Circuit
The THS6101 architecture results in a very low third-harmonic distortion of -64 dBc at 29.3 MHz and an output power level of 56 dBmV. Signal linearity is maintained at maximum output levels, providing a third-harmonic distortion of -58 dBc at 29.3 MHz and an output power level of 62 dBmV. The device also exhibits an IP3 of 83 dBmV at a frequency of 65 MHz and an output power level of 60 dBmV, for two-tone intermodulation effects. Output noise from the THS6101 is very low. At minimum gain, the device produces less than 10 nV/Hz of noise at its output. This translates to a level of -47 dBmV at the lowest symbol rate, which is lower than that required by DOCSIS. The THS6101 exhibits a disable-mode output noise of 2 nV/Hz or -61 dBmV. The THS6101 output power level range exceeds the 58 dBmV required by DOCSIS. Its 62-dBmV RMS drive readily compensates for typical losses associated with the output transformer and tuner duplexer. The THS6101 provides a gain range of 54 dB, from 32 dB down to -22 dB in 6-dB steps. The gain is programmable through an SPI-compatible serial interface with a 4-bit control word. The stringent power requirements of cable telephony and VOIP systems will greatly benefit from the low, industry-leading power consumption of the THS6101. With a typical 10% transmit duty-cycle, the 15-mW disable-mode power consumption of the THS6101 results in an average power consumption of 94 mW. Furthermore, the advanced architecture of the THS6101 reduces this average power consumption to 15 mW when transmitting at minimum gain.
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
Copyright (c) 2000, Texas Instruments Incorporated
PRODUCT PREVIEW information concerns products in the formative or design phase of development. Characteristic data and other specifications are design goals. Texas Instruments reserves the right to change or discontinue these products without notice.
POST OFFICE BOX 655303
* DALLAS, TEXAS 75265
1
PRODUCT PREVIEW
THS6101 UPSTREAM CABLE DRIVER FOR DOCSIS-COMPLIANT CABLE COMMUNICATIONS
SLOS257 - AUGUST 2000
AVAILABLE OPTIONS PACKAGED DEVICES TA 0C to 70C TSSOP (PWP) PowerPADTM THS6101CPWP
-40C to 85C THS6101IPWP This package is available taped and reeled. To order this packaging option, add an R suffix to the part number (e.g., THS6101CPWPR).
Absolute maximum ratings over operating free-air temperature range (unless otherwise noted)
Supply voltage, VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13.2 V Supply voltage, VDD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.5 V Input voltage, VI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . VCC Output current, IO . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 250 mA Differential input voltage, VID . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 V Continuous total power dissipation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . See Dissipation Rating Table Operating free air temperature, TA: C suffix . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0C to 70C I suffix . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -40C to 85C Maximum junction temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 150C Storage temperature, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -65_C to 150C Lead temperature 1,6 mm (1/16 inch) from case for 10 seconds . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 300C
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 under "recommended operating conditions" is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability. DISSIPATION RATING TABLE JA JC (C/W) (C/W)
PRODUCT PREVIEW
PACKAGE
TA = 25C POWER RATING
PWP(24) 30.1 0.92 3.32 W This data was taken using 2 oz. Trace and copper pad that is soldered directly to a 3 in. x 3 in. PCB. The data shown for was taken using the recommended PowerPADTM PCB guidelines.
JA
recommended operating conditions
MIN Operating free air temperature TA free-air temperature, C suffix I suffix 0 -40 TYP MAX 70 85 UNIT C
power supply
PARAMETER VCC VDD Analog supply voltage Logic supply voltage Transmit mode, G = 32 dB (Gain code = 9) Transmit mode, G = 26 dB (Gain code = 8) ICC Quiescent current Transmit mode, G = 20 dB (Gain code = 7) Transmit mode, G = 14 dB (Gain code = 6) Transmit mode, G = 8 dB (Gain code = 5) Transmit mode, G = 2 dB (Gain code = 4) TEST CONDITIONS MIN 4.5 4.5 TYP 5 5 186 125 68 40 30 22 mA MAX 5.5 5.5 UNIT V V
2
POST OFFICE BOX 655303
* DALLAS, TEXAS 75265
THS6101 UPSTREAM CABLE DRIVER FOR DOCSIS-COMPLIANT CABLE COMMUNICATIONS
SLOS257 - AUGUST 2000
recommended operating conditions (continued)
power supply
PARAMETER TEST CONDITIONS Transmit mode, G = -4 dB (Gain code = 3) Transmit mode, G = -10 dB (Gain code = 1) ICC Quiescent current Transmit mode, G = -16 dB (Gain code = 1) Transmit mode, G = -22 dB (Gain code = 0) Disable mode (TX = 0) MIN TYP 20 16 16 15 3 mA MAX UNIT
electrical characteristics, VCC = VDD = 5 V, VIN = 0.25 Vp-p, RL = 75 , TA = 25C (unless otherwise noted)
input characteristics
PARAMETER ZIN VIN CMRIN Input impedance Input voltage range Common mode rejection Gain range Absolute gain accuracy Gain step width Differential VIN,CM = 1 V, fIN = 10 MHz, Gain = 2 -22 -1 5.8 6 TEST CONDITIONS Single-ended MIN TYP 750 62.5 60 32 1 6.2 250 MAX UNIT W mV dB dB dB dB
output characteristics
PARAMETER Output voltage range Output impedance TEST CONDITIONS VCC = 5 V Transmit mode Disable mode Gain = 32 dB, TX = 1 Output noise spectral density Gain = -22 dB, TX = 1 All gain codes, TX = 0 MIN TYP 6.32 75 75 94.5 10 2 nV/Hz MAX UNIT Vp-p W W
dynamic performance
PARAMETER Full power bandwidth 2nd Harmonic distortion 3rd Harmonic distortion 3rd Order intercept Gain code = 9, Gain code < 9, fin= 44 MHz i fin= 29 3 MHz i 29.3 fin= 29.3 MHz fin1 = 42 MHz, fin2 = 42.2 MHz, Gain code = 9 (G = 32 dB) fin1= 65 MHz, VOUT = 60 dBmV, Gain code = 9 (G = 32 dB) fin = 65 MHz, Gain code = 9 (G = 32 dB) fin = 65 MHz, TEST CONDITIONS Vin = 35 dBmV sine wave, Vin = 39 dBmV sine wave VOUT = 56 dBmV VOUT = 62 dBmV VOUT = 56 dBmV VOUT = 62 dBmV VOUT = 60 dBmV VOUT = 60dBmV, VIN = 30dBmV, fin2 = 65.2 MHz, VIN = 30 dBmV, VOUT = 60 dBmV, Disable mode MIN TYP 100 -62 -57 -64 -58 83 -65 MAX UNITS MHz dBc dBc dBmV dBc
Two-tone Two tone 3rd order distortion
-62.5
dBc
Spurious-free dynamic range Signal feedthrough and spurious emissions
TBD TBD
dBc dBmV
POST OFFICE BOX 655303
* DALLAS, TEXAS 75265
3
PRODUCT PREVIEW
THS6101 UPSTREAM CABLE DRIVER FOR DOCSIS-COMPLIANT CABLE COMMUNICATIONS
SLOS257 - AUGUST 2000
electrical characteristics, VCC = VDD = 5 V, VIN = 0.25 Vp-p, RL = 75 , TA = 25_C (unless otherwise noted) (continued)
power control
PARAMETER Turn on/turn off time Enable/disable output transient voltage Transient slew rate Gain code 0 Gain code 1 Gain code 2 Gain code 3 Gain code 4 Gain code 5 Gain code 6 Gain code 7 Gain code 8 Gain code 9 Gain code = 9 Gain code 5 All gain codes G = -22 dB (min gain) G = -16 dB G = -10 dB G = -4 dB G = 2 dB G = 8 dB G = 14 dB G = 20 dB G = 26 dB G = 32 dB (max gain) TBD 10000000 10000001 10000010 10000011 10000100 10000101 10000110 10000111 10001000 10001001 TEST CONDITIONS MIN TYP TBD 100 7 MAX UNIT ms mV V/s
PRODUCT PREVIEW
device
PARAMETER LOGIC INPUT LEVELS VIH VIL IIH IIL tc(CLK) tsu(DS) th(DH) tsu(ENS) th(ENH) High-level input voltage Low-level input voltage High-level input current Low-level input current Clock cycle time DATAIN to CLK setup time DATAIN to CLK hold time EN to CLK setup time EN to CLK hold time Relative to GND Relative to GND VIH = 5 V VIL = 0.5 V 20 5 5 10 10 20 0.9 2 0.8 100 2 V V nA mA ns ns ns ns ns TEST CONDITIONS MIN TYP MAX Units
SERIAL INTERFACE TIMING
PARAMETER MEASUREMENT INFORMATION
The THS6101 is a multistage amplifier specifically designed to drive the return path in DOCSIS-compliant cable modems. The device is designed to comply with the DOCSIS requirements, providing sufficient output power, low output noise and distortion, and a clean transition to the low-power mode. The THS6101 has a current-mode open collector output stage. A 2:1 balun transformer provides power from the 5-V connection at its primary center tap and converts the THS6101 differential output to a single-ended output for driving a coaxial cable. An external 300- resistor across the device outputs provides proper termination of the line.
4
POST OFFICE BOX 655303
* DALLAS, TEXAS 75265
THS6101 UPSTREAM CABLE DRIVER FOR DOCSIS-COMPLIANT CABLE COMMUNICATIONS
SLOS257 - AUGUST 2000
PRINCIPLES OF OPERATION
The gain of the THS6101 ranges from -22 dB at the minimum setting to 32 dB at the maximum setting. A serial SPI-compatible interface provides control over the gain setting. Figure 1 illustrates the required timing of the serial interface. The following table matches gain code with its corresponding gain value.
CODE 10000000 10000001 10000010 10000011 10000100 10000101 10000110 10000111 10001000 10001001 GAIN -22 dB -16 dB -10 dB -4 dB 2 dB 8 dB 14 dB 20 dB 26 dB 32 dB
The last four bits of the code represents the THS6101 gain setting.
tsu(DS) DATAIN
8-Bit Data Word 8-Bit Data Word
tc(CLK) CLK th(DH) EN tsu(ENS) th(ENH) 8 Clock Cycles
Figure 1. Serial Interface Timing The THS6101 provides 9 coarse gain steps of 6 dB, for a full gain range of 54 dB. Variable attenuation incorporated into many DOCSIS-compliant cable modem solutions provides the fine gain control required by DOCSIS. To produce the correct output power levels, the THS6101 requires a nominal input power level of 25 dBmV to 30 dBmV. These input levels correctly interpolate between the 6-dB steps produced by the THS6101. Since cable modem transmissions are burst-mode in nature, the THS6101 is equipped with both a transmit and a disable mode. The TX input pin controls this functionality. With the TX pin pulled high, the THS6101 is powered-up and ready to transmit. Pulling the TX pin low reduces the quiescent current of the THS6101 to 2 mA and shuts down the output stage of the amplifier, isolating it from the line.
POST OFFICE BOX 655303
* DALLAS, TEXAS 75265
5
PRODUCT PREVIEW
THS6101 UPSTREAM CABLE DRIVER FOR DOCSIS-COMPLIANT CABLE COMMUNICATIONS
SLOS257 - AUGUST 2000
MECHANICAL DATA
PWP (R-PDSO-G**)
20 PINS SHOWN
PowerPADTM PLASTIC SMALL-OUTLINE
0,65 20
0,30 0,19 11
0,10 M
Thermal Pad (See Note D) 4,50 4,30 6,60 6,20 0,15 NOM
Gage Plane
PRODUCT PREVIEW
1 A
10 0- 8
0,25 0,75 0,50
Seating Plane 1,20 MAX 0,15 0,05 PINS ** DIM A MAX A MIN 0,10
14 5,10 4,90
16 5,10 4,90
20 6,60 6,40
24 7,90 7,70
28 9,80 9,60 4073225/F 10/98
NOTES: A. B. C. D.
All linear dimensions are in millimeters. This drawing is subject to change without notice. Body dimensions do not include mold flash or protrusions. The package thermal performance may be enhanced by bonding the thermal pad to an external thermal plane. This pad is electrically and thermally connected to the backside of the die and possibly selected leads. E. Falls within JEDEC MO-153
PowerPAD is a trademark of Texas Instruments.
6
POST OFFICE BOX 655303
* DALLAS, TEXAS 75265
IMPORTANT NOTICE Texas Instruments and its subsidiaries (TI) reserve the right to make changes to their products or to discontinue any product or service without notice, and advise customers to obtain the latest version of relevant information to verify, before placing orders, that information being relied on is current and complete. All products are sold subject to the terms and conditions of sale supplied at the time of order acknowledgment, including those pertaining to warranty, patent infringement, and limitation of liability. TI warrants performance of its semiconductor products to the specifications applicable at the time of sale in accordance with TI's standard warranty. Testing and other quality control techniques are utilized to the extent TI deems necessary to support this warranty. Specific testing of all parameters of each device is not necessarily performed, except those mandated by government requirements. Customers are responsible for their applications using TI components. In order to minimize risks associated with the customer's applications, adequate design and operating safeguards must be provided by the customer to minimize inherent or procedural hazards. TI assumes no liability for applications assistance or customer product design. TI does not warrant or represent that any license, either express or implied, is granted under any patent right, copyright, mask work right, or other intellectual property right of TI covering or relating to any combination, machine, or process in which such semiconductor products or services might be or are used. TI's publication of information regarding any third party's products or services does not constitute TI's approval, warranty or endorsement thereof.
Copyright (c) 2000, Texas Instruments Incorporated

▲Up To Search▲

Price & Availability of SLOS257

	To Download SLOS257 Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .