M I C R O T U N E™ MT1530 UPSTREAM AMPLIFIER ADVANCE DATA SHEET CATV APPLICATIONS 1 APPLICATIONS • • • Cable modems Telephony over cable Set-top box CATV • • • Lowest power consumption upstream amplifier available Maximum output level of 64 dBmV Low power-up/down transients of 4 mVp-p typical at 59 dBmV output • • • • • • • • • Best in class second harmonic distortion Ultra low third harmonic distortion Single +5V supply 63-dB Gain range Gain programmable in 1-dB steps Low transmit output noise floor: 131 nV / √Hz Low transmit-disable output noise: 810 pV / √Hz Two power-down modes DOCSIS and EuroDOCSIS compatible Preliminary and Proprietary 2 FEATURES 3 OVERVIEW The Microtune 1530 (MT1530) is a low-cost programmable-gain power amplifier IC for use in CATV upstream applications. Specifically, the MT1530 is optimized for the DOCSIS upstream standard. The device operates at a frequency range from 5 MHz to 65 MHz, and can output 64 dBmV through a 4:1 impedance-ratio transformer. Second harmonic distortion is typically less than -70 dBc, and third harmonic distortion is typically less than -55 dBc at a 59 dBmV output level. A 3-wire digital serial bus controls the variable gain, with gain control available in 1-dB steps and a nominal 63-dB gain range. The MT1530 may be disabled via an external control pin. The transmit-disable mode not only minimizes output noise by shutting off the output stage, but also maintains its output impedance at nominal levels. Output glitch transients are nominally less than 4 mV at maximum gain settings during transmit enable/disable switching. Operating from a single +5V supply, the amplifier’s typical current draw at maximum gain, or minimum attenuation, is 102 mA. Additionally, internal circuitry reduces the amplifier’s power consumption depending on gain setting. Transmit-disable mode power supply current is reduced to a nominal of 14 mA. A shutdown mode further reduces current to a nominal of 130 µA. The MT1530 is available in a 20-pin SSOP package for the extended industrial temperature range of -40°C to +85°C. DS-00010 Rev 1.2 — December 2000 Page 1 of 14 MT1530 UPSTREAM AMPLIFIER ADVANCE DATA SHEET CATV APPLICATIONS 4 ABSOLUTE MAXIMUM RATING S Stresses greater than those listed in Table 1 may cause permanent damage to the device. These are stress ratings only; functional operation of the device under conditions other than those listed in the operational sections of this document is not recommended or implied. Exposure to any of the absolute-maximum rating conditions for extended periods of time may affect reliability. Table 1 Stress Ratings MIN MAX UNIT VCC (VCC1, VCC2) -0.7 6 V VOUT+, VOUT- -0.7 7.5 V Input voltage levels (all inputs), VCM −0.7 VCC + 0.7 V +150 °C +150 °C +300 °C Preliminary and Proprietary PARAMETER Junction temperature Storage temperature range -55 Lead temperature (soldering, 10 seconds) 5 DC ELECTRICAL CHARACTERIS TICS The DC electrical characteristics listed in Table 2 are valid for the following conditions unless otherwise noted. Typical parameters are at TA = +25°C. • VCC = +4.75V to +5.25V • • • TXEN = high D7 = 1 TA = -40°C to +85°C Table 2 DC Electrical Characteristics PARAMETER Supply voltage Supply current, transmit mode SYMBOL MIN VCC 4.75 Gain code = 52 to 63 Gain code = 46 to 51 Supply current, shutdown mode (D7 = 0 or SHDN = 0) MAX UNIT 5.25 V 102 129 59 75 37 47 ICC 14 19 mA ICC 131 164 µA ICC Gain code = 45 to 0 Supply current, transmit-disable mode (TXEN = low) TYP mA Input high voltage VIH Input low voltage VIL Input high current IIH 0 µA Input low current IIL 0 µA 2.0 V 0.8 V DS-00010 Rev 1.2 — December 2000 Page 2 of 14 MT1530 UPSTREAM AMPLIFIER ADVANCE DATA SHEET CATV APPLICATIONS 6 AC ELECTRICAL CHARACTERIS TICS The AC electrical characteristics listed in Table 3 are valid for the following conditions unless otherwise noted. Typical parameters are at TA = +25°C. • VCC = +4.75V to +5.25V • TXEN = SHDN = high • • D7 = 1 VIN = 33 dBmV differential • • Output impedance = 75Ω through a 4:1 impedance transformer TA = -40°C to +85°C Table 3 Preliminary and Proprietary PARAMETER AC Electrical Characteristics of the MT1530 SYMBOL AV Voltage gain CONDITIONS FIN = 5 MHz to 42 MHz MIN TYP MAX UNIT Gain control word = 0 -33.6 -32.4 -31.1 dB Gain control word = 63 28.1 VOUT = 59 dBmV, FIN = 42 MHz 1 Gain rolloff VOUT = 59 dBmV, FIN = 65 MHz 1 dB Compression point 1 AV = 29 dB, 42 MHz 65 Output step size FIN = 5 MHz to 42 MHz 0.7 Transmit mode noise AV = 26 dB P1dB 2 30.8 32.1 dB -0.25 -0.5 dB -0.9 -1.5 dB 67 dBmV 1 1.3 dB 131 150 nV / √Hz AV = -26 dB 8.5 10.1 nV / √Hz Transmit-disable mode noise TXEN = low, AV = 26 dB, FIN = 5 MHz to 65 MHz 810 pV / √Hz Isolation in transmitdisable mode TXEN = low, gain control word = 63, FIN = 65 MHz 69 dB TXEN Transient duration TXEN rise/fall time < 0.1µs 1.5 µs 2 2 2 TXEN Transient step size Input impedance ZIN Output impedance ZOUT Output return loss RL Third-order output intercept OIP3 2 Harmonic distortion HD2 3 Harmonic distortion HD3 nd rd Gain setting = 63 4 16 mVp-p Gain setting = 51 or lower2 2 8 mVp-p FIN = 5 MHz to 65 MHz, single-ended2 FIN = 5 MHz to 65 MHz 2 Input tones at 65 MHz and 66 MHz, VIN = 28 dBmV/tone, VOUT = 53 dBmV/tone2 1.35 1.85 kΩ 75 Ω 10.7 15 dB 80 84 dBmV FIN = 33 MHz, VOUT = +59 dBmV -72 -66 dBc FIN = 65 MHz, VOUT = +59 dBmV -70 -64 dBc FIN = 22 MHz, VOUT = +59 dBmV -59 -55 dBc FIN = 65 MHz, VOUT = +59 dBmV -55 -51 dBc 1 Referenced to 10 MHz. 2 Guaranteed by design. DS-00010 Rev 1.2 — December 2000 Page 3 of 14 MT1530 UPSTREAM AMPLIFIER ADVANCE DATA SHEET CATV APPLICATIONS 7 TYPICAL PERFORMANCE Preliminary and Proprietary The following data is representative of a part measured in a typical application circuit. • • 4:1 impedance ratio balun on the output Zload = 75Ω, Vcc = 5V • TA = 25°C 0.30 30 25 20 15 10 5 0 -5 -10 -15 -20 -25 -30 -35 0.20 0.10 0.00 5MHz 5MHz 15MHz 42MHz 65MHz -0.10 -0.20 -0.30 0 5 10 15 20 25 30 35 40 45 50 55 0 60 5 10 15 20 25 Gain Code Figure 1 30 35 40 45 50 55 60 Gain Code Voltage Gain vs. Gain Code Figure 2 1.8 Differential Gain Linearity vs. Gain Code 100 Referenced to 5MHz 1.6 95 1.4 90 1.2 TXEN = LOW 85 1.0 20 MHz 80 65 MHz 0.8 75 0.6 70 0.4 65 MHz 65 0.2 60 42 MHz 0.0 55 -0.2 0 5 Figure 3 10 15 20 25 30 35 Gain Code 40 45 50 55 28 60 30 32 34 36 38 Figure 4 -45 42 MHz 86 84 46 48 50 52 54 56 58 60 62 Vin = 34 dBmV -50 -55 65 MHz 82 44 Input-Output Isolation vs. Gain Code Vout = 53 dBmV / Tone 88 42 Gain Code Gain Rolloff vs. Gain Code 90 40 -60 80 78 -65 65 MHz 76 -70 74 33 MHz 72 -75 70 68 -80 50 51 52 53 54 55 56 57 58 59 60 61 62 63 50 Gain Code Figure 5 Third-Order Output Intercept vs. Gain Control 51 52 53 54 55 56 57 58 59 60 61 62 63 Gain Code Figure 6 Second-Order Harmonic Distortion vs. Gain Code DS-00010 Rev 1.2 — December 2000 Page 4 of 14 MT1530 UPSTREAM AMPLIFIER ADVANCE DATA SHEET CATV APPLICATIONS 69 -40 Vin = 34 dBmV 42 MHz 68 -45 20 MHz 67 66 -50 65 -55 65 MHz 64 65 MHz 63 -60 62 30 MHz -65 61 50 51 52 53 54 55 56 57 58 59 60 61 62 63 52 Gain Code Figure 7 Third-Order Harmonic Distortion vs. Gain Code 1.0E-06 53 Figure 8 54 55 56 57 58 Gain Code 59 60 61 62 63 Output 1 dB Compression Point vs. Gain and Frequency 110 Preliminary and Proprietary 100 90 1.0E-07 80 70 60 1.0E-08 50 40 30 1.0E-09 20 0 5 10 15 20 25 30 35 40 45 50 55 60 0 Gain Code Figure 9 Output Noise vs. Gain Code 5 10 15 20 25 30 35 Gain Code 40 45 50 55 60 Figure 10 Power Supply Current vs. Gain Code 10 Z0 = 75 Ohms 15 20 25 30 35 5 15 25 35 45 55 65 75 85 95 Frequency ( MHz ) Figure 11 Output Return Loss vs. Frequency DS-00010 Rev 1.2 — December 2000 Page 5 of 14 MT1530 UPSTREAM AMPLIFIER ADVANCE DATA SHEET CATV APPLICATIONS 8 DETAILED DESCRIPTION 5 6 Variable Attenuator Vout+ 16 Vcm 14 Power Amp Input Amp Vin+ Vcc2 Vcc1 2 19 This section describes the MT1530 functional blocks shown in Figure 12. CEXT Vin- CS SDA SCLK TXEN 8 10 18 DGND 7 15 PA Control 9 SHDN Serial Interface 12 Preliminary and Proprietary Vout- Figure 12 MT1530 Amplifier Block Diagram 8.1 FUNCTIONAL MODES The MT1530 amplifier has three functional modes controlled through the serial interface or external pins: transmit mode, transmit-disable mode, and shutdown mode. 8.1.1 TRANSMIT MODE Transmit mode is the normal active mode of the MT1530. The TXEN and SHDN pins must be held high in this mode. 8.1.2 TRANSMIT-DISABLE MODE Transmit-disable mode is typically used between bursts in TDMA systems. This mode shuts off the power amplifier while keeping the input amplifier and variable attenuator powered up. Taking TXEN low while keeping SHDN high and D7 = 1 (see Table 5) activates this mode. DS-00010 Rev 1.2 — December 2000 Page 6 of 14 MT1530 UPSTREAM AMPLIFIER ADVANCE DATA SHEET CATV APPLICATIONS 8.1.3 SHUTDOWN MODE Shutdown mode minimizes current consumption while maintaining the programmed gain state stored in the latch of the serial interface. All analog functions are disabled in this mode and current consumption is reduced to 131 µA (typical). Shutdown mode is enabled when either D7 = 0 or SHDN is set low. This mode overrides the TXEN input pin, but TXEN should be held low to minimize glitching when exiting this mode. Preliminary and Proprietary 8.2 IC ARCHITECTURE The MT1530’s signal path consists of an input amplifier, a variable attenuator, and a power amplifier as shown in Figure 12. The input amplifier is a fixed-gain, low-noise, differential amplifier with a nominal input impedance of 1.85 kΩ. The variable attenuator is capable of a 51-dB attenuation range in 1-dB steps. The output power amplifier has 12 dB of gain range in 6 dB steps. 8.2.1 INPUT AMPLIFIER The input amplifier (IA) is a fully differential, low-noise amplifier with no gain adjustment. Its bias may be disabled either by the external SHDN pin, or D7 of the serial control register. For best second-order performance, the IA should be driven differentially. However, the device may be driven in a single-ended mode, with the other unused input bypassed to ground with a 10 nF capacitor. The IA’s inputs are self-biasing and must be AC coupled. 8.2.2 VARIABLE ATTENUATOR The variable attenuator (VA) provides up to 51 dB attenuation of the input signal in nominal 1-dB increments. The architecture is fully differential to minimize glitching and even-order harmonics. This attenuator acts together with the output power amplifier to achieve a nominal 63 dB of gain range, as described in section 8.2.3. 8.2.3 OUTPUT POWER AMPLIFIER The output power amplifier (PA) is a fully differential amplifier capable of driving +64 dBmV into a 75Ω load. An off-chip transformer must be used to convert from a differential to a single-ended output. The PA’s output impedance is nominally 300Ω, which is transformed to 75Ω by the 4:1 impedance ratio transformer. This impedance is maintained when the amplifier is powered down by setting TXEN = low. The amplifier’s outputs are powered by +5V connected to the center tap of the transformer’s secondary. The differential nature of the PA provides superior second-order harmonic performance. Additionally, any single-ended transients on the amplifier’s outputs that are generated during transmit enable/disable switching are cancelled by this architecture. DS-00010 Rev 1.2 — December 2000 Page 7 of 14 MT1530 UPSTREAM AMPLIFIER ADVANCE DATA SHEET CATV APPLICATIONS In addition to providing output power, the PA also plays a role in the gainprogrammability of the IC. The output amplifier has attenuation settings of 0, 6, and 12 dB. Higher attenuations reduce output power and noise. The programmed gain control code automatically sets the PA’s attenuation. Gain control codes of 52 through 63 set the PA’s attenuation to 0 dB, putting the PA at maximum power. Gain control codes of 46 to 51 set the PA’s attenuation to 6 dB, lowering its power by half. Gain control codes of less than 46 set the PA’s attenuation to 12 dB, lowering its power to one quarter of the maximum value. Transmit-disable and shutdown modes turn off power to the PA for maximum isolation and minimum output noise. 8.2.4 PA CONTROL Preliminary and Proprietary The PA Control (PAC) both adjusts the output amp’s gain, and manages power-up and power-down transients. The PAC uses internal timing circuits to control the ramp-up and ramp-down of the PA’s bias block. This orderly ramp keeps the PA’s output glitch to very low levels. The PAC begins a bias ramp-down on the falling edge of TXEN. A rising TXEN produces a bias ramp-up. Note that for a minimum glitch on the output, the rest of the IC must already be powered up by having disabled shutdown mode. 8.3 SERIAL INTERFACE The serial interface (SI) programs the gain of the MT1530 using an 8-bit control word. The SI uses the gain control word to set the VA’s and PA’s gains individually using an internal decoder. It has an active-low chip-select ( CS ) to synchronize to the incoming word. Data is clocked MSB first on the rising edge of SCLK. Data is latched on the rising edge of CS . Table 4 and Table 5 show the register format. Figure 13 illustrates serial interface timing. Table 4 Serial Interface Control Word BIT MNEMONIC 7 (MSB) D7 Software shutdown (active low) 6 D6 Unused (Don’t Care) 5 D5 Gain control, Bit 5 4 D4 Gain control, Bit 4 3 D3 Gain control, Bit 3 2 D2 Gain control, Bit 2 DESCRIPTION 1 D1 Gain control, Bit 1 0 (LSB) D0 Gain control, Bit 0 DS-00010 Rev 1.2 — December 2000 Page 8 of 14 MT1530 UPSTREAM AMPLIFIER ADVANCE DATA SHEET CATV APPLICATIONS Preliminary and Proprietary Table 5 Chip State Control Bits STATE SHDN TXEN D7 D6 D5 D4 D3 D2 D1 D0 GAIN STATE (DECIMAL) 0 0 X X X X X X X X X Shutdown mode X 0 0 X X X X X X X X Software shutdown mode 1 0 1 X X X X X X X X Transmit-disable mode 1 1 1 X X X X X X X X Transmit mode 1 1 1 X 0 0 0 0 0 0 0 Gain = -32 dB1 1 1 1 X 0 0 0 0 0 1 1 Gain = -31 dB1 1 1 1 X 1 0 0 0 0 0 32 Gain = 0 dB1 1 1 1 X 1 1 1 1 1 0 62 Gain = 30 dB1 1 1 1 X 1 1 1 1 1 1 63 Gain = 31 dB1 1 Typical gain at +25°C, VCC = +5V, Fin = 20 MHz DS-00010 Rev 1.2 — December 2000 Page 9 of 14 MT1530 UPSTREAM AMPLIFIER ADVANCE DATA SHEET Table 6 CATV APPLICATIONS Timing Characteristics Preliminary and Proprietary PARAMETER SYMBOL MIN CS to SCK rise setup time tSENS 10 ns CS to SCK rise hold time tSENH 20 ns SDA to SCK setup time tSDAS 10 ns SDA to SCK hold time tSDAH 20 ns SDA pulse width high tDATAH 50 ns SDA pulse width low tDATAL 50 ns SCK pulse width high tSCKH 50 ns SCK pulse width low tSCKL 50 ns tSENS tDATAH/ tDATAL tSDAS TYP tSDAH MAX UNITS tSCKL tSCKH tSENH CS SCLK SDA D7 D6 D5 D4 D3 D2 D1 D0 Figure 13 Serial Interface Timing Diagram DS-00010 Rev 1.2 — December 2000 Page 10 of 14 MT1530 UPSTREAM AMPLIFIER ADVANCE DATA SHEET CATV APPLICATIONS 9 TERMINAL CONNECTIONS Terminal connections for the MT1530 are described in Table 7. Preliminary and Proprietary Table 7 Terminal Connections PIN FUNCTION/ SYMBOL 1 GND Ground connection 2 VCC1 +5V Power supply for the input amplifier, variable attenuator, and serial interface. Bypass to GND1 with a 0.1 µF decoupling capacitor as close to the part as possible. 3 NC 4 GND1 Ground connection for the input amplifier and variable attenuator 5 VIN+ Positive input to the input amplifier VIN- Negative input to the input amplifier. Bypass with capacitor if driving amplifier single-ended. 6 7 DGND 8 CS DESCRIPTION No connect Ground connection to serial interface Chip select input to serial interface (active low) 9 SDA Data input to serial interface (active high) 10 SCLK Clock input to serial interface (positive-edge triggered) 11 NC 12 SHDN 13 NC 14 VCM No connect Shutdown mode input (active low) No connect Output common-mode bypass. Bypass to GND2 with 0.1 µF capacitor. 15 VOUT- PA negative output 16 VOUT+ PA positive output 17 NC 18 TXEN PA output enable input (active high) No connect 19 VCC2 +5V Power supply for PA bias and control circuitry. Bypass to GND2 with a 0.1 µF decoupling capacitor as close to the part as possible. 20 GND2 Ground connection for the PA DS-00010 Rev 1.2 — December 2000 Page 11 of 14 MT1530 UPSTREAM AMPLIFIER ADVANCE DATA SHEET CATV APPLICATIONS 10 PIN CONFIGURATION Preliminary and Proprietary Top View GND 1 20 GND2 VCC1 2 19 VCC2 NC 3 18 TXEN GND1 4 17 NC VIN+ 5 16 VOUT+ VIN- 6 15 VOUT- DGND 7 14 VCM CS 8 13 NC SDA 9 12 SHDN SCLK 10 11 NC MT1530 Figure 14 Pin Diagram DS-00010 Rev 1.2 — December 2000 Page 12 of 14 MT1530 UPSTREAM AMPLIFIER ADVANCE DATA SHEET CATV APPLICATIONS 11 PACKAGE DRAWING SEE:V.T"D" AA ONLY SEE: V.T"S" 0.045" DIA AB/AC/AD ONLY C L 3 2 1 0.118 0.016 X 45° 0.010 0.157 MAX 0.150 MIN C L CL C L 0.035 MAX 0.016 MIN 0.244 MAX 0.228 MIN 2X 0.003 2X 0.010 N C L 0.010 Preliminary and Proprietary D/2 END VIEW TOP VIEW 0.061 MAX 0.055 MIN 8° MAX 0 MIN 0.012 MAX 0.008 MIN 0.068 MAX 0.061 MIN 0.025 C L CL 0.005 H 0.010 MAX 0.007 MIN 0.009 MAX 0.007 MIN PARTING LINE SEATING PLANE 0.004 0.0098 MAX 0.004 MIN SEE DETAIL "C" WITH PLATING SIDE VIEW 0.011 MAX 0.008 MIN BASE METAL DETAIL "C" CONTROLLING DIMENSION: INCHES VARIATIONS AA AB AC AD MIN. 0.189 0.337 0.337 0.386 V.T."D" MAX. NOM. 0.196 0.194 0.344 0.342 0.342 0.344 0.391 0.393 MIN. 0.002 0.050 0.025 0.025 V.T."S" NOM. MAX. 0.005 0.007 0.053 0.055 0.028 0.030 0.028 0.030 N 16 20 24 28 THIS PACKAGE MEETS JEDEC REGISTRATION MO-137AA-AF EXCEPT FOR THE PKG THICKNESS, DIM 0.061 MAX. Figure 15 MT1530 Package Drawing DS-00010 Rev 1.2 — December 2000 Page 13 of 14 MT1530 UPSTREAM AMPLIFIER ADVANCE DATA SHEET CATV APPLICATIONS NOTICES Preliminary and Proprietary NOTICE - The information in this document is believed to be accurate and reliable. Microtune assumes no responsibility for any consequences arising from the use of this information, nor from any infringement of patents or the rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or other rights of Microtune. The information in this publication replaces and supersedes all information previously supplied, and is subject to change without notice. The customer is responsible for assuring that proper design and operating safeguards are observed to minimize inherent and procedural hazards. Microtune assumes no responsibility for applications assistance or customer product design. NOTICE - The devices described in this document are not authorized for use in medical, life-support equipment, or any other application involving a potential risk of severe property or environmental damage, personal injury, or death without prior express written approval of Microtune. Any such use is understood to be entirely at the user’s risk. TRADEMARKS - Microtune, MicroTuner, and the Microtune logo are trademarks of Microtune, Inc. All other trademarks belong to their respective companies. PATENTS - This product is manufactured and protected by the following U.S. patents: 5,805,988; 5,739,730; 5,625,325; 5,737,035; 5,648,744; 5,717,730; 5,847,612; 6,104,242; 6,100,761; 6,144,402; and additional patents pending or filed. COPYRIGHT - Entire contents Copyright © 2000 Microtune, Inc. World Headquarters Microtune, Inc. 2201 Tenth Street Plano, TX 75074 European Headquarters Microtune GmbH and Co. KG Marie Curie Strasse 1 85055 Ingolstadt / Germany Pan-Asian Headquarters Microtune, Inc. - Hong Kong Silvercord Tower 1, Room 503 30 Canton Road Kowloon, Hong Kong Telephone: 972-673-1600 Fax: 972-673-1602 Email: [email protected] Website: www.microtune.com Telephone: +49-841-9378-011 Fax: +49-841-9378-010 Sales Telephone: +49-841-9378-020 Sales Fax: +49-841-9378-024 Telephone: +852-2378-8128 Fax: +852-2302-0756 For a detailed list of current sales representatives, visit our Web site at www.microtune.com. DS-00010 Rev 1.2 — December 2000 Page 14 of 14