PDF MAX3532 Data sheet ( Hoja de datos )

Número de pieza	MAX3532
Descripción	Upstream CATV Driver Amplifier
Fabricantes	Maxim Integrated
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No Preview Available ! 19-1331; Rev 1; 6/98 EVAALVUAAILTAIOBNLEKIT Upstream CATV Driver Amplifier ________________General Description The MAX3532 is a programmable power amplifier for use in upstream cable applications. The device outputs up to 62dBmV (continuous wave) through a 1:2 (voltage ratio) transformer when driven with 36dBmV at its input. It features variable gain, which is controlled via a 3-wire digital serial bus and available in 1dB steps. The operat- ing frequency ranges from 5MHz to 42MHz. The MAX3532 offers three operating modes: high power, low noise, and transmit disable. High-power mode achieves the highest output levels, while low-noise mode achieves the lowest output noise when driving lower out- put levels. Transmit disable mode places the device in a high-isolation state with minimum output noise, for use between bursts in TDMA systems. Two power-down modes are also available. Software shut- down mode permits power-down of all analog circuitry while maintaining the programmed gain setting. Shutdown mode disables all circuitry and reduces current consumption below 10µA. The MAX3532 comes in a 36-pin SSOP package screened for the extended-industrial temperature range (-40°C to +85°C). ________________________Applications Cable Modems CATV Set-Top Box Telephony over Cable __________Typical Operating Circuit 36 SHDN CONTROL LOGIC 35 1–10, 12, 13, 15–17, 21–25, 32 TXEN GND VOUT- 34 8.0Ω 1:2 OUTPUT VOUT+ 33 8.0Ω MAX3532 VEE2 31 INPUT 0.001µF 28 27 VIN+ VIN- 0.001µF VCC 0.1µF 14 VCC1 11 VEE1 VCC2 VCC 30 29 VEE SCLK SDA CS 26 20 19 18 0.1µF 0.1µF VCC VCC CONTROL LOGIC ____________________________Features o Single +5V Supply o Output Level Ranges from Less than 8dBmV to 62dBmV, in 1dB Steps o Gain Programmable in 1dB Steps o 350mW Typical Power Dissipation o Transmit-Disable Mode o Two Shutdown Modes _______________Ordering Information PART MAX3532EAX TEMP. RANGE -40°C to +85°C PIN-PACKAGE 36 SSOP ___________________Pin Configuration TOP VIEW GND 1 GND 2 GND 3 GND 4 GND 5 GND 6 GND 7 GND 8 GND 9 GND 10 VEE1 11 GND 12 GND 13 VCC1 14 GND 15 GND 16 GND 17 CS 18 MAX3532 SSOP 36 SHDN 35 TXEN 34 VOUT- 33 VOUT+ 32 GND 31 VEE2 30 VCC2 29 VCC 28 VIN+ 27 VIN- 26 VEE 25 GND 24 GND 23 GND 22 GND 21 GND 20 SCLK 19 SDA †Protected under U.S. Patent 5,748,027 ________________________________________________________________ Maxim Integrated Products 1 For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800. For small orders, phone 408-737-7600 ext. 3468. 1 page Upstream CATV Driver Amplifier ______________________________________________________________Pin Description PIN 1–10, 12, 13, 15, 16, 17, 21–25, 32 11 14 18 19 20 26 27 28 29 30 31 33 34 35 36 NAME GND VEE1 VCC1 CS SDA SCLK VEE VIN- VIN+ VCC VCC2 VEE2 VOUT+ VOUT- TXEN SHDN FUNCTION Ground Pins Serial Data Interface Ground. As with all grounds, maintain the shortest possible (low-inductance) connections to the ground plane. Serial Data Interface +5V Supply. Bypass this pin with a 0.1µF decoupling capacitor as close to the part as possible. Serial-Interface Enable. TTL-compatible input. See Serial Interface section. Serial-Interface Data. TTL-compatible input. See Serial Interface section. Serial-Interface Clock. TTL-compatible input. See Serial Interface section. Programmable Gain Amplifier (PGA) Ground. As with all grounds, maintain the shortest possible (low-inductance) connection to the ground plane. Negative Input. When not used, this port must be AC coupled to ground. Along with VIN+, this port forms a high-impedance differential input to the PGA. Driving this port differentially will increase the rejection of second-order distortion. Positive Input. Along with VIN-, this port forms a high-impedance differential input to the PGA. Driving this port differentially will increase the rejection of second-order distortion. AC couple to this pin. PGA +5V Supply. Bypass this pin with a decoupling capacitor as close to the part as possible. Power Amplifier +5V Supply. Bypass this pin with a decoupling capacitor as close to the part as possible. Power Amplifier Ground. As with all grounds, connections maintain the shortest possible (low-induc- tance) length to the ground plane. Positive Output. Along with VOUT-, this pin forms a low-impedance output. Typically this port drives a 1:2 transformer through 8Ω series resistors. Negative Output. Along with VOUT+, this pin forms a low-impedance output. Typically this port drives a 1:2 transformer through 8Ω series resistors. Transmit Amplifier Enable. Setting this pin low places the transmitter in a high-isolation state (transmit disable mode). In this mode, however, significant common-mode voltage swings exist. It is, there- fore, important to maintain good balance of the differential output through to the transformer primary. Shutdown. When this pin is set low, all functions (including the serial interface) are disabled, leaving only leakage currents to flow. _______________________________________________________________________________________ 5 5 Page

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