CMOS TrimDAC
a
FEATURES Low Cost Replaces 8 Potentiometers 50 kHz 4-Quadrant Multiplying Bandwidth Low Zero Output Error Eight Indivi...
Description
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FEATURES Low Cost Replaces 8 Potentiometers 50 kHz 4-Quadrant Multiplying Bandwidth Low Zero Output Error Eight Individual Channels 3-Wire Serial Input 500 kHz Update Data Loading Rate ±3 V Output Swing Midscale Preset, Zero Volts Out
APPLICATIONS Automatic Adjustment Trimmer Replacement Vertical Deflection Amplitude Adjustment Waveform Generation and Modulation
8-Bit Octal, 4-Quadrant Multiplying, CMOS TrimDAC
AD8842
FUNCTIONAL BLOCK DIAGRAM
VDD LD
SDI CLK
DECODED ADDRESS 8
LOGIC DATA
48
SERIAL REGISTER
8X 8
DAC
R E G I S T E R S
8 8
DAC A
G
AD8842
DAC H
G
VINA VOUT A VINH VOUT H
GND
SDO PR
VSS
GENERAL DESCRIPTION The AD8842 provides eight general purpose digitally controlled voltage adjustment devices. The TrimDAC® capability allows replacement of the mechanical trimmer function in new designs. The AD8842 is ideal for ac or dc gain control of up to 50 kHz bandwidth signals. The four-quadrant multiplying capability is useful for signal inversion and modulation often...
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