MAXIM MAX5420AEUA+

The MAX5420/MAX5421 are digitally programmable precision voltage dividers for programmable-gain amplifiers. Operationally, these devices consist of digitally selectable precision resistor-dividers providing noninverting gains of 1, 2, 4, and 8 for PGA applications. The MAX5420/MAX5421 achieve divider ratio accuracy of 0.025% (MAX5420A/MAX5421A), 0.09% (MAX5420B/MAX5421B) or 0.5% (MAX5420C/MAX5421C). The end-to-end resistance from + to - is 15KΩ. The impedance seen at W is designed to be the same 8KΩ for divider ratios 2, 4, and 8, ensuring excellent impedance matching and constant switching times. In gain of +1 configuration, H is internally connected to W with a typical resistance of 500Ω. The MAX5421 includes a matching resistor to compensate for offset voltage due to input bias current of the op amp. The resistance from MATCH_H to MATCH_L equals the resistance seen at W for gains of 2, 4, and 8. In the gain of +1, an internal switch connects MATCH_H and MATCH_L. This internal switch matches the impedance of the switch between H and W.

• Operate from a single +5V supply or dual ±5V supply, and consume only 3μA supply current
• Provide four precision noninverting gains of 1, 2, 4, and 8 for PGAs
• Achieve a resistor ratio accuracy of 0.025% (MAX542_A), 0.09% (MAX542_B), and 0.5% (MAX542_C)
• The MAX5421 includes an on-chip matching resistor for op amp bias-current compensation
• Available in 8-pin and 10-pin µMAX packages
• Specified over the extended temperature range (-40°C to +85°C)
• Four precision divider ratios for noninverting gains of 1, 2, 4, and 8 in PGAs
• 0.025%, 0.09%, or 0.5% ratio accuracy guaranteed over -40°C to +85°C
• On-chip matching resistor for op amp bias-current compensation (MAX5421)
• 5V single or ±5V dual supply operation
• Low supply current
• CMOS/TTL logic compatible 2-wire parallel interface
• Small 8-pin and 10-pin µMAX packages

• General-Purpose Programmable Noninverting Amplifiers
• Programmable Instrumentation Amplifiers