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### Data sheet #### Description The INA128 and INA129 are low-power, general-purpose instrumentation amplifiers offering excellent accuracy. A versatile 3-op-amp design and small size make them ideal for a wide range of applications. Current-feedback input circuitry provides wide bandwidth even at...

### Data sheet #### Description The INA128 and INA129 are low-power, general-purpose instrumentation amplifiers offering excellent accuracy. A versatile 3-op-amp design and small size make them ideal for a wide range of applications. Current-feedback input circuitry provides wide bandwidth even at high gain (200 kHz at $G=100$). A single external resistor sets any gain from 1 to 10,000. The INA128 is laser-trimmed for very low offset voltage (50 $\mu$V typ) and high common-mode rejection. The INA129 is even more precise, with offset voltage of 25 $\mu$V and higher common-mode rejection. They operate with power supplies as low as $\pm2.25$ V, and quiescent current is only 750 $\mu$A. The INA128 and INA129 are available in 8-pin plastic DIP and SO-8 surface-mount packages, specified for the $-40°C$ to $+85°C$ temperature range. A 16-pin plastic DIP package is also available for the INA128. #### Features * Low Power: 750 $\mu$A * Gain Set with External Resistor * Excellent Accuracy: INA129 * Low Offset Voltage: 25 $\mu$V max * Low Drift: 0.25 $\mu$V/°C max * High CMR: 120 dB min * INA128 * Low Offset Voltage: 50 $\mu$V max * Low Drift: 0.5 $\mu$V/°C max * High CMR: 110 dB min * Wide Bandwidth: 200 kHz at G = 100 * High Input Impedance: $10^9 \Omega$ * Supply Range: $\pm2.25$ to $\pm18$ V * Packages: 8-Pin DIP, SO-8, 16-Pin DIP #### Typical Application Differential amplifier with high common-mode rejection #### Pin Configuration Pin configurations diagrams for DIP and SO packages. #### Absolute Maximum Ratings * Supply Voltage: $+/-18$V * Input Voltage: $+/- V_S$ * Storage Temperature: $-55°C$ to $+125°C$ * Operating Temperature: $-40°C$ to $+85°C$ * Lead Temperature (soldering, 10s): 300°C #### Electrical Characteristics Test conditions: $V_S = \pm15V$, $T_A = 25°C$, $R_L = 10k\Omega$, $R_G = 10k\Omega$, unless otherwise noted. | Parameter | Symbol | Condition | INA129 Min | INA129 Typ | INA129 Max | INA128 Min | INA128 Typ | INA128 Max | Units | | :----------------------------- | :-------------- | :------------------------------------------ | :--------- | :--------- | :--------- | :--------- | :--------- | :--------- | :----------- | | **Input Characteristics** | | | | | | | | | | | Input Offset Voltage | $V_{OS}$ | $T_A = 25°C$ | | 10 | 25 | | 25 | 50 | $\mu V$ | | | | $-40°C < T_A < +85°C$ | | | 50 | | | 100 | $\mu V$ | | Input Offset Voltage Drift | $TCV_{OS}$ | $-40°C < T_A < +85°C$ | | 0.1 | 0.25 | | 0.3 | 0.5 | $\mu V/°C$ | | Input Bias Current | $I_B$ | $T_A = 25°C$ | | 0.3 | 2 | | 0.3 | 2 | $nA$ | | | | $-40°C < T_A < +85°C$ | | | 5 | | | 5 | $nA$ | | Input Offset Current | $I_{OS}$ | $T_A = 25°C$ | | 0.1 | 0.5 | | 0.1 | 0.5 | $nA$ | | | | $-40°C < T_A < +85°C$ | | | 1 | | | 1 | $nA$ | | Input Voltage Range | $V_{ICR}$ | | -12.6 | | +12.6 | -12.6 | | +12.6 | $V$ | | Common-Mode Rejection | $CMR$ | $R_S = 1 k\Omega$, $G = 1$ | 110 | 120 | | 100 | 110 | | $dB$ | | | | $R_S = 1 k\Omega$, $G = 100$ | 110 | 120 | | 100 | 110 | | $dB$ | | Input Impedance | $Z_{IN}$ | Differential | | $10^{10}$ | | | $10^{10}$ | | $\Omega$ | | | | Common-Mode | | $10^{10}$ | | | $10^{10}$ | | $\Omega$ | | **Output Characteristics** | | | | | | | | | | | Output Voltage Range | $V_O$ | $R_L = 10 k\Omega$ | -12.2 | | +12.2 | -12.2 | | +12.2 | $V$ | | | | $R_L = 600 \Omega$ | -11.5 | | +11.5 | -11.5 | | +11.5 | $V$ | | Output Impedance | $Z_O$ | Open-Loop | | 0.05 | | | 0.05 | | $\Omega$ | | Output Short-Circuit Current | $I_{SC}$ | | | $\pm25$ | | | $\pm25$ | | $mA$ | | **Power Supply** | | | | | | | | | | | Rated Voltage | $V_S$ | | $\pm4.5$ | $\pm15$ | $\pm18$ | $\pm4.5$ | $\pm15$ | $\pm18$ | $V$ | | Operating Voltage | $V_S$ | | $\pm2.25$ | | $\pm18$ | $\pm2.25$ | | $\pm18$ | $V$ | | Quiescent Current | $I_Q$ | | | 750 | 900 | | 750 | 900 | $\mu A$ | | **Dynamic Performance** | | | | | | | | | | | Gain Bandwidth Product | $GBP$ | $G = 1$ | | 2 | | | 2 | | $MHz$ | | Slew Rate | $SR$ | $G = 1$ | | 2.8 | | | 2.8 | | $V/\mu s$ | | Settling Time | | To 0.01%, $10V$ Step | | 5 | | | 5 | | $\mu s$ | | **Noise Performance** | | | | | | | | | | | Input Voltage Noise | $e_n$ | $f = 1 kHz$, $R_S = 1 k\Omega$, $G \ge 100$ | | 11 | | | 11 | | $nV/\sqrt{Hz}$ | | Input Current Noise | $i_n$ | $f = 1 kHz$, $R_S = 1 k\Omega$, $G \ge 100$ | | 0.4 | | | 0.4 | | $pA/\sqrt{Hz}$ | *Note:* Electrical characteristics apply to both devices unless otherwise noted. **Table 1.** Electrical Characteristics