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AD620ARZ

Inst Amp, G=1-10000, 30uV Vos, SOIC-8

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Pieza del fabricante：

AD620ARZ

Paquete：

SOIC-8 (4,9 x 3,9 x 1,5 mm, paso de 1,27 mm)

Marca：
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Descripción

Productos

The AD620ARZ from Analog Devices is a low-drift, low-power instrumentation amplifier with single-resistor gain setting (1 to 10000), SOIC-8 package, and excellent DC precision.

Especificaciones

Tipo Low-Drift Low-Power Instrumentation Amplifier
Gain Range 1 to 10,000 (single external resistor)
Gain Formula G = 1 + (49.4 kOhm / RG)
Tensión de offset de entrada 30 uV (typical); 50 uV (max, B grade)
Input Offset Drift 0.6 uV/C (max, B grade)
Corriente de polarización de entrada 0.5 nA (typical); 1.0 nA (max)
CMRR 93 dB (min) @ G=1; 130 dB @ G=1000
Bandwidth 1 MHz @ G=1; 120 kHz @ G=100
Velocidad de giro 1.2 V/us
Settling Time 15 us to 0.01%
Tensión de alimentación +/-2.3V to +/-18V
Supply Current 1.3 mA (max)
Input Voltage Noise 9 nV/sqrt(Hz) @ 1kHz
Paquete SOIC-8 (R suffix)
Temperatura de funcionamiento -40C to +85C (A grade)

Características

  • Gain set with single external resistor (1 to 10000)
  • 30uV typical input offset voltage
  • 0.6uV/C max offset drift (B grade)
  • 1nA max input bias current (Super-beta processing)
  • 100dB min CMRR at G=10
  • 9 nV/sqrt(Hz) input voltage noise at 1kHz
  • 15us settling time to 0.01%
  • Wide supply range +/-2.3V to +/-18V

Aplicaciones

  • Weigh scales
  • ECG and medical instrumentation
  • Transducer interfaces
  • Data acquisition systems

The AD620ARZ from Analog Devices is a low-cost, high-precision instrumentation amplifier that requires only one external resistor to set gains from 1 to 10,000. The device features 30uV typical input offset voltage, 0.6uV/C max offset drift, and 1.0nA max input bias current (achieved through Super-beta input processing), making it ideal for precision data acquisition. The 100dB minimum CMRR at G=10 rejects common-mode interference in bridge and thermocouple applications. The 9 nV/sqrt(Hz) input voltage noise at 1kHz and 0.28uV p-p noise in the 0.1-10Hz band enable low-noise signal conditioning for ECG and weigh scale applications. The 15us settling time to 0.01% supports multiplexed data acquisition systems. The wide +/-2.3V to +/-18V supply range allows operation from dual 5V to +/-15V rails. The 1.3mA max supply current makes it suitable for battery-powered portable equipment. The gain is set by the formula G = 1 + 49.4kOhm/RG, where RG is connected between the RG pins.

The AD620ARZ uses a classic three-op-amp instrumentation amplifier topology with a precision laser-trimmed thin-film resistor network. The input stage consists of two non-inverting amplifiers (A1, A2) with feedback through the internal 24.7kOhm resistors and the external gain resistor RG. The differential input voltage (V+IN – V-IN) appears across RG, creating a current I = (V+IN – V-IN) / RG. This current flows through the internal 24.7kOhm resistors, producing a preamplified differential voltage of (V+IN – V-IN) x (1 + 2 x 24.7k/RG) = (V+IN – V-IN) x (1 + 49.4k/RG) at the outputs of A1 and A2. The output stage (A3) is a unity-gain difference amplifier that converts the differential signal to a single-ended output. The internal 24.7kOhm and 10kOhm resistors are laser-trimmed to achieve the high CMRR specification. The Super-beta input transistors provide the 1nA max input bias current by using high-gain PNP transistors in the input pair, which is critical for high-impedance sensor interfaces where bias current would create offset voltage across source resistance. The settling time of 15us to 0.01% is achieved through the optimized compensation of the internal amplifiers.

Pin Nombre Tipo Función
1 RG1 Entrada Gain resistor connection 1
2 -IN Entrada Inverting input (high impedance)
3 +IN Entrada Non-inverting input (high impedance)
4 -VS Potencia Negative supply
5 REF Entrada Output reference (usually GND)
6 OUTPUT Salida Amplified output voltage
7 +VS Potencia Positive supply
8 RG2 Entrada Gain resistor connection 2
  • Load cell weigh scale with AD620 at G=1000 and 30uV offset for sub-gram resolution from 2mV/V bridge output
  • ECG front-end instrumentation amplifier with 0.28uV p-p low-frequency noise, 100dB CMRR, and Super-beta 1nA bias current
  • Thermocouple signal conditioning with G=100, +/-15V supply, and 0.6uV/C offset drift for cold-junction compensation accuracy
Fabricante Número de pieza Paquete Notas
ADI AD620BRZ SOIC-8 B grade, better offset spec
ADI AD8221ARZ SOIC-8 Newer, better CMRR, wider BW
TI INA128UA SOIC-8 Equivalent function, similar spec
ADI AD8422ARZ SOIC-8 Lowest noise, 3.2nV/sqrtHz
TI INA333AIDR SOIC-8 Zero-drift, 350uA supply
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