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Part: MAX445C/D
Category:
Analog & Mixed-Signal Processing
-> Amplifiers
-> High Speed/Video Amplifiers
Description: Low-cost, High-resolution, 200mhz Video CRT Driver
Company: Maxim Integrated Products
Datasheet: Download MAX445C/D datasheet File size : 242 kB
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Datasheet text preview:
19-0302; Rev 0; 9/94
Low-Cost, High-Resolution, 200MHz Video CRT Driver
_______________General Description
The MAX445 is a high-performance, monolithic, variablegain transconductance amplifier with a high-voltage open-collector output capable of directly driving a video display (CRT cathode). A 2.5ns rise time is achieved using a peaking network with a 200 load resistor and an 8pF total load (CRT and parasitic capacitance). Differential inputs and a linear adjustable gain stage w i t h an output offset adjustment make the versatile MAX445 well suited for many video display applications. A buffered bandgap reference voltage is availa b l e for the gain (contrast) and offset adjustments along with a TTL BLANK input to turn off the output current, independent of signal input. The MAX445 is available in a 24-pin power-tab DIP p a c k a g e . A suitable heatsink must be attached to maintain the junction temperature within the recommended operating range.
____________________________Features
o 2.5ns Rise/Fall Time into an 8pF Load o 200MHz Small-Signal Bandwidth o 50Vp-p Output o Ground Referenced Differential Inputs o Linear Variable Gain for Contrast Control o Offset Adjustment for Black Level o 5.5V Bandgap Reference o Drives 1280 x 1024 and 1530 x 1280 Displays
MAX445
______________Ordering Information
PART MAX445CPG MAX445C/D TEMP. RANGE 0°C to +70°C* 0°C to +70°C** PIN-PACKAGE 24 Power-Tab DIP Dice
________________________Applications
CRT Driver for High-Resolution Monochrome and Color Displays High-Voltage, Variable-Gain Transconductance Amplifier
* Case temperature range, TCASE = 0°C to +90°C. See Absolute Maximum Ratings and Applications Information for thermal/heat sink considerations. **Dice are specified at TJ = +25°C, DC parameters only.
________________Functional Diagram
VAA
__________________Pin Configuration
TOP VIEW
RL VOUT IOUT
GND VREF OFFSET CONTRAST
1 2 3 4 5 6 7 8 9 10 11 12
24 23 22 21
GND GND GND VEEO N.C. IOUT N.C. VCB VCB GND GND GND
CONTRAST
BLANK
MAX445
VIN+ PRE-AMP VINBAND G AP CURRENT AMP
VCB
GNDA VINVIN+ VEE VEE
MAX445
20 19 18 17 16 15 14 13
GNDA
VCC BLANK GND
OFFSET
VREF
GND
Power-Tab DIP
________________________________________________________________ Maxim Integrated Products
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Low-Cost, High-Resolution, 200MHz Video CRT Driver MAX445
ABSOLUTE MAXIMUM RATINGS
VAA Output Supply........80V VAA Output Supply with Respect to VCB.......70V VCB Common-Base Supply .........20V VCC Positive Supply ...12.5V VEE Negative Supply..........-12.5V Differential Input Voltage..........2V Common-Mode Input Voltage......±2V Contrast Input Voltage.......-1V to +6V Offset Input Voltage.....-1V to +6V Blank Input Voltage .....-1V to +6V Bandgap-Reference Output Current ..-5mA Continuous Power Dissipation derate at 170mW/°C above TCASE = +90°C.....10W Operating Junction Temperature ....-55°C to +150°C Storage Temperature........-55°C to +150°C Lead Temperature (soldering, 10sec) .....+300°C
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 in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS
( V A A = 20V, VCB = 10V ±0.5V, V C C = 10V ±0.5V, V E E = -10.5V ±0.5V, VIN = (VIN+) - (VIN-) = 0V, CONTRAST = 1.0V, OFFSET = 1.0V, RL = 0, BLANK = 0.4V, TCASE = +25°C, unless otherwise noted.) PARAMETER Output-Common-Base Supply Current Positive Supply Current Negative Supply Current Power-Supply Rejection Ratio Low Blank Input Bias Current High Blank Input Bias Current Contrast Input Bias Current Offset Input Bias Current VIN+ or VIN- Signal Input Current Input Common-Mode Rejection Ratio VIN+ or VIN- DC Input Impedance VIN+ or VIN- Input Capacitance Reference Output Voltage Output Current (Blanked) Output Current Output Current Change vs. Temperature Output Current Change vs. Contrast ADJ Output Current Change vs. VIN, Blanked SYMBOL ICB ICC IEE PSRR IIL IIH IIC IIB IIS CMRR RVIN CIN VREF IOUT IOUT IOUT IOUT IOUT ILOAD = 2mA BLANK = 2.4V, OFFSET = 1V, VAA = 75V BLANK = 2.4V, OFFSET = 3V OFFSET = 0V, CONTRAST = 4.0V OFFSET = 5.0V, CONTRAST = 1V TC = +25°C to +90°C CONTRAST = 0V to 5V BLANK = 2.4V, CONTRAST = 5.0V, VIN- = 0.3V CONTRAST = 5.0V Transconductance, IOUT to VIN Amplifier Linearity Error (Gm/VIN) Contrast Linearity Error (Gm/Contrast) Bandwidth, 3dB BW Gm CONTRAST = 1.0V CONTRAST = 0V CONTRAST = 4.0V, OFFSET = 1.0V VIN = 0.2V, OFFSET = 0V OFFSET = 0V, RLOAD = 100 200 400 70 -25 -0.1 80 ±3 ±10 ±1 600 120 25 ±2 ±3 % % MHz mA/V 5.25 VCM = ±0.5V, CONTRAST = 5.0V IVEE + IVEEO VCC, VEE = ±5%, VIN = +250mV, CONTRAST = 5.0V, referred to input BLANK = 0.4V BLANK = 2.4V CONTRAST = 5.0V OFFSET = 1.0V -100 25 -0.6 -0.4 0 0 -50 36 10 2 5.75 ±1 ±1 25 140 0 0 10 10 50 CONDITIONS MIN TYP MAX 40 70 UNITS mA mA mA dB mA mA µA µA µA dB k pF V mA mA mA mA mA
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Low-Cost, High-Resolution, 200MHz Video CRT Driver
ELECTRICAL CHARACTERISTICS (continued)
( V A A = 20V, VCB = 10V ±0.5V, V C C = 10V ±0.5V, V E E = -10.5V ±0.5V, VIN = (VIN+) - (VIN-) = 0V, CONTRAST = 1.0V, OFFSET = 1.0V, RL = 0, BLANK = 0.4V, TCASE = +25°C, unless otherwise noted.) PARAMETER SYMBOL CONDITIONS RL = 200, CL = 8pF, VAA = 75V, tr(VIN) < 1ns, No peaking, OUTp-p = 50V With peaking, OUTp-p = 45V MIN TYP 3.6 ns 2.5 8 ±2 ns % MAX UNITS
MAX445
Rise/Fall Time (10% to 90%)
tr, tf
Settling Time (90% to 100% ±2%) Thermal Distortion
ts
CL = 8pF, no peaking
______________________________________________________________Pin Description
PIN 1, 12, 13, 14, 15, 22, 23, 24 2 3 4 5 6 7 8, 9 10 11 16, 17 18, 20 19 21 NAME GND VREF OFFSET CONTRAST GNDA VINVIN+ VEE VCC BLANK VCB N.C. IOUT VEEO FUNCTION High-Current Ground. Connect all pins to ground plane. Reference Output (+5.5V) Output Voltage Offset-Adjustment Input Output Gain-Adjustment Input Pre-Amp Ground Inverting Signal Input Noninverting Signal Input Negative Supply (-10.5V) Positive Supply (+10V) Blanking Input, TTL Output Common-Base Supply (+10V) No Connection--leave open Open-Collector Current Output Negative Supply for Output Stage (-10.5V)
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