AD8842ARZ

AD8842 is a 8bit octal, 4-quadrant multiplying, CMOS TrimDAC. The TrimDAC® capability allows replacement of the mechanical trimmer function in new designs. This ideal for ac or dc gain control of up to 50KHz bandwidth signals. The four-quadrant multiplying capability is useful for signal inversion and modulation often found in video vertical deflection circuitry. Internally it contains eight voltage output digital-to-analogue converters, each with separate voltage inputs. A new current conveyor amplifier design performs the four-quadrant multiplying function with a single amplifier at the output of the current steering digital-to-analogue converter. This approach offers an improved constant input resistance performance versus previous voltage switched DACs used in TrimDAC circuits, eliminating the need for additional input buffer amplifiers. Application includes automatic adjustment, trimmer replacement, vertical deflection amplitude adjustment, waveform generation and modulation.

• Low cost, replaces 8 potentiometers
• 50KHz 4-quadrant multiplying bandwidth, low zero output error
• Eight individual channels, 3-wire serial input
• 500KHz update data loading rate, ±3V output swing
• Midscale present, zero volts out
• Resolution is 8bits (min, VDD = +5V, TA = -40°C to +85°C)
• Integral nonlinearity error is ±0.2LSB (typ, VDD = +5V, TA = -40°C to +85°C)
• Slew rate is 50KHz (typ, VINx = ±3VP, RL = 2kohm, CL = 10pF)
• Total harmonic distortion is 0.01% (typ, VINx = 4V p-p, D = FFH, f = 1KHz, fLPF = 80KHz, RL = 1kohm)
• 24 lead SOIC-W package, operating temperature range from -40°C to +85°C

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