MAX445 Datasheet, PDF (1/8 Pages) Maxim Integrated Products – Low-Cost, High-Resolution, 200MHz Video CRT Driver

19-0302; Rev 0; 9/94
Low-Cost, High-Resolution, 200MHz
Video CRT Driver
_______________General Description
The MAX445 is a high-performance, monolithic, variable-
gain 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 200Ω load resistor and
an 8pF total load (CRT and parasitic capacitance).
Differential inputs and a linear adjustable gain stage
with an output offset adjustment make the versatile
MAX445 well suited for many video display applica-
tions. A buffered bandgap reference voltage is avail-
able for the gain (contrast) and offset adjustments
along with a TTL BLANK input to turn off the output cur-
rent, independent of signal input.
The MAX445 is available in a 24-pin power-tab DIP
package. A suitable heatsink must be attached to
maintain the junction temperature within the recom-
mended operating range.
________________________Applications
CRT Driver for High-Resolution Monochrome and
Color Displays
High-Voltage, Variable-Gain Transconductance
Amplifier
____________________________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
______________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
* 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
CONTRAST
BLANK
V_AA
RL
V_OUT
IOUT
MAX445
VCB
VIN+
PRE-AMP
VIN-
CURRENT
AMP
GNDA
BAND
GAP
OFFSET
VREF
GND
__________________Pin Configuration
TOP VIEW
GND ₁
VREF ₂
OFFSET ₃
CONTRAST ₄
GNDA ₅
VIN- 6
VIN+ ₇
VEE ₈
VEE ₉
V_{CC 10}
BLANK ₁₁
GND ₁₂
MAX445
24 ^GND
23 ^GND
22 ^GND
21 ^VEEO
20 ^N.C.
19 IOUT
18 ^N.C.
17 VCB
16 VCB
15 ^GND
14 ^GND
13 ^GND
Power-Tab DIP
________________________________________________________________ Maxim Integrated Products 1
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