PDF MAX4448ESE Data sheet ( Hoja de datos )

Número de pieza	MAX4448ESE
Descripción	6500V/s / Wideband / High-Output-Current / Single- Ended-to-Differential Line Drivers with Enable
Fabricantes	Maxim Integrated
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No Preview Available ! 19-1519 Rev 0; 8/99 6500V/µs, Wideband, High-Output-Current, Single- Ended-to-Differential Line Drivers with Enable General Description The MAX4447/MAX4448/MAX4449 single-ended-to- differential line drivers are designed for high-speed communications. Using current feedback for greater bandwidth, these devices deliver full-power bandwidths up to 405MHz and feature slew rates as high as 6500V/µs. The MAX4447 has a fixed gain of +2V/V and a small-signal bandwidth of 430MHz. The MAX4448/ MAX4449 have small-signal bandwidths of 330MHz and 400MHz, respectively, and are internally compen- sated for minimum gain configurations of +2V/V and +5V/V, respectively. For greater design flexibility, the MAX4448/MAX4449 allow for variable gain selection using external gain-setting resistors. A low-power enable mode reduces current consumption below 5.5mA and places the outputs in a high-impedance state. The MAX4447/MAX4448/MAX4449 can deliver differen- tial output swings of ±6.2V from ±5V supplies with a 50Ω load. Excellent differential gain/phase and noise specifications make these amplifiers ideal for a wide variety of video and RF signal-processing and transmis- sion applications. Applications Differential Line Driver Single-Ended-to-Differential Conversion High-Speed Differential Transmitter Coaxial to Twisted-Pair Converter Differential Pulse Amplifier Differential ADC Driver xDSL Applications Video and RF Signal Processing and Transmission Pin Configuration TOP VIEW VCC 1 VCC 2 N.C. 3 N.C. (RG) 4 IN 5 N.C. 6 VEE 7 VEE 8 MAX4447 MAX4448 MAX4449 SO ( ) ARE FOR MAX4448/MAX4449 ONLY 16 GND 15 OUT- 14 VEE 13 VEE 12 VEE 11 VEE 10 OUT+ 9 EN Features o 6500V/µs Slew Rate (MAX4449) o Small-Signal Bandwidth 430MHz (MAX4447) 330MHz (MAX4448) 400MHz (MAX4449) o 200MHz 0.1dB Gain Flatness (MAX4447) o 130mA Output Drive Current o +2V/V Internally Fixed Gain (MAX4447) o External Gain Selection ≥ +2V/V (MAX4448) ≥ +5V/V (MAX4449) o -78dB SFDR at 100kHz o Low Differential Gain/Phase: 0.01%/0.02° o Ultra-Low Noise: 23nV/√Hz at fIN = 1MHz o 8ns Settling Time to 0.1% Ordering Information PART MAX4447ESE MAX4448ESE MAX4449ESE TEMP. RANGE -40°C to +85°C -40°C to +85°C -40°C to +85°C PIN-PACKAGE 16 Narrow SO 16 Narrow SO 16 Narrow SO Typical Operating Circuit +5V 0.1µF 75Ω INPUT 75Ω VCC IN EN OUT+ RT MAX4447 VEE OUT- RT GND 0.1µF 75Ω 75Ω TO LOAD -5V ________________________________________________________________ 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 1-800-835-8769. 1 page 6500V/µs, Wideband, High-Output-Current, Single- Ended-to-Differential Line Drivers with Enable Typical Operating Characteristics (VCC = +5V, VEE = -5V, VEN = +5V, VOUT = VOUT+ - VOUT-, RL = 100Ω between OUT+ and OUT-, AV = +2V/V for MAX4447/MAX4448, AV = +5V/V for MAX4449, TA = +25°C, unless otherwise noted.) MAX4447 MAX4448 MAX4449 SMALL-SIGNAL GAIN vs. FREQUENCY SMALL-SIGNAL GAIN vs. FREQUENCY SMALL-SIGNAL GAIN vs. FREQUENCY (VOUT = 100mVp-p) (VOUT = 100mVp-p) (VOUT = 100mVp-p) 444 333 222 111 000 -1 -1 -1 -2 -2 -2 -3 -3 -3 -4 -4 -4 -5 -5 -5 -6 100k 1M 10M 100M FREQUENCY (Hz) 1G -6 100k 1M 10M 100M FREQUENCY (Hz) 1G -6 100k 1M 10M 100M FREQUENCY (Hz) 1G MAX4447 GAIN FLATNESS vs. FREQUENCY (VOUT = 100mVp-p) 0.5 MAX4448 GAIN FLATNESS vs. FREQUENCY (VOUT = 100mVp-p) 0.5 MAX4449 GAIN FLATNESS vs. FREQUENCY (VOUT = 100mVp-p) 0.5 0.4 0.4 0.4 0.3 0.3 0.3 0.2 0.2 0.2 0.1 0.1 0.1 000 -0.1 -0.1 -0.1 -0.2 -0.2 -0.2 -0.3 -0.3 -0.3 -0.4 -0.4 -0.4 -0.5 100k 1M 10M 100M 1G FREQUENCY (Hz) MAX4447 LARGE-SIGNAL GAIN vs. FREQUENCY (VOUT = 2Vp-p) 4 -0.5 100k 1M 10M 100M 1G FREQUENCY (Hz) MAX4448 LARGE-SIGNAL GAIN vs. FREQUENCY (VOUT = 2Vp-p) 4 -0.5 100k 1M 10M 100M 1G FREQUENCY (Hz) MAX4449 LARGE-SIGNAL GAIN vs. FREQUENCY (VOUT = 2Vp-p) 4 333 222 111 000 -1 -1 -1 -2 -2 -2 -3 -3 -3 -4 -4 -4 -5 -5 -5 -6 100k 1M 10M 100M FREQUENCY (Hz) 1G -6 100k 1M 10M 100M FREQUENCY (Hz) 1G -6 100k 1M 10M 100M FREQUENCY (Hz) 1G _______________________________________________________________________________________ 5 5 Page 6500V/µs, Wideband, High-Output-Current, Single- Ended-to-Differential Line Drivers with Enable IN 500mV/div OUT 1V/div CL = 15pF IN 500mV/div OUT 1V/div CL = 15pF Figure 3. Capacitive-Loaded Output Step Response Without Isolation Resistor Figure 4. Capacitive-Loaded Output Step Response with 14Ω Isolation Resistor Setting Gain The MAX4448/MAX4449 are stable with minimum gain of +2V/V and +5V/V, respectively. An external resistor, RGAIN, connected between RG and GND sets the gain of these devices. Calculate the gain as follows: Gain = 2 (1 + 300 / RGAIN) RGAIN for the MAX4449 must be ≤200Ω. Driving Capacitive Loads The MAX4447/MAX4448/MAX4449 are designed to drive capacitive loads. However, excessive capacitive loads may cause ringing or instability at the output as phase margin is reduced. Adding a small series isola- tion resistor at the output helps reduce the ringing but slightly increases gain error. Twisted-Pair Line Driver The MAX4447/MAX4448/MAX4449 are well-suited to drive twisted-pair cables. The 24AWG telephone wire widely used produces losses at the higher frequencies. Compensate for these losses by increasing the gain slightly. Chip Information TRANSISTOR COUNT: 291 ______________________________________________________________________________________ 11 11 Page

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