INA293A1
Every spec below is cited to the manufacturer datasheet. Compare the closest alternatives, then ask the assistant what it means for your design.
What the INA293A1 does
The INA293x family are ultra-precise current-sense amplifiers designed to measure voltage drops across shunt resistors within a wide common-mode range of -4V to 110V. These devices operate on a single supply from 2.7V to 20V, drawing only 1.5mA of quiescent current. Key specifications include a 1.3MHz bandwidth, 160dB DC common-mode rejection ratio, and gain errors of ±0.15% maximum. The family offers five selectable gain options ranging from 20V/V to 500V/V across multiple temperature grades. Engineers typically use these amplifiers in high-speed overcurrent protection, 48V server power supplies, battery management systems, and macro remote radio units where precise current monitoring is critical.
Datasheet parameters
| Parameter | Min | Typ | Max | Conditions | Source |
|---|---|---|---|---|---|
| quiescent current | — | 1.5 mA | 2 mA | iq; POWER SUPPLY | TI datasheet, p. 6 — 6.5 Electrical Characteristics (continued) |
| supply voltage range | 2.7 V | — | 20 V | TA = -40°C to +125°C; vs; POWER SUPPLY | TI datasheet, p. 6 — 6.5 Electrical Characteristics (continued) |
| input offset voltage drift | — | 50 nV/°C | 500 nV/°C | TA = -40°C to +125°C, INA293x1, INA293x2, INA293x3; INPUT | TI datasheet, p. 5 — 6.5 Electrical Characteristics |
| input offset voltage | — | 30 µV | 150 µV | INA293x1; vos; INPUT | TI datasheet, p. 5 — 6.5 Electrical Characteristics |
| cmrr | 140 dB | 160 dB | — | -4 V ≤ VCM≤ 110 V, TA = -40°C to +125°C; cmrr; INPUT | TI datasheet, p. 5 — 6.5 Electrical Characteristics |
| operating temperature | -40 °C | — | 125 °C | ta; over operating free-air temperature range (unless otherwise noted) | TI datasheet, p. 5 — over operating free-air temperature range (unless otherwise noted) |
| input bias current | 10 µA | 20 µA | 30 µA | IB+, VSENSE = 0 V; ib; INPUT | TI datasheet, p. 5 — 6.5 Electrical Characteristics |
| slew rate | — | 2.5 V/µs | — | Rising edge; FREQUENCY RESPONSE | TI datasheet, p. 6 — 6.5 Electrical Characteristics (continued) |
| psrr | — | 120 dB | — | PSRR vs frequency, flat at 120 dB from 10 Hz to ~1 kHz (Figure 6-12) | TI datasheet, p. 8 |
| input voltage noise density | — | 50 nV/√Hz | — | ven; NOISE | TI datasheet, p. 6 — 6.5 Electrical Characteristics (continued) |
| response time | — | 2 µs | — | output response time, < 2 µs; T_response = VOUT THR/SR, 75-A threshold on 2-mΩ shunt, VS = 5 V | TI datasheet, p. 15 — 表 7-2. Response Time |
| settling time | — | 5 µs | — | VOUT = 4 V ± 0.1 V step, Output settles to 1%; FREQUENCY RESPONSE | TI datasheet, p. 6 — 6.5 Electrical Characteristics (continued) |
| channel count | — | 1 | — | TI datasheet, p. 3 — 表 5-1. Pin Functions |
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Frequently asked questions
What is the channel count of the INA293A1?
The channel count is 1.
What is the CMRR of the INA293A1 when -4 V ≤ VCM≤ 110 V and TA = -40°C to +125°C?
The CMRR is 160 dB.
What is the input bias current (ib) for the INA293A1 when VSENSE is 0 V?
The input bias current is 20 µA.
What is the input offset voltage for the INA293x1?
The input offset voltage is 30 µV.
What is the input offset voltage drift for the INA293A1, INA293x2, and INA293x3 over the temperature range of TA = -40°C to +125°C?
The input offset voltage drift is 50 nV/°C.
What is the input voltage noise density?
The input voltage noise density is 50 nV/√Hz at ven; NOISE.
What is the maximum operating free-air temperature (ta) for the INA293A1?
The maximum operating free-air temperature (ta) is 125 °C over the operating free-air temperature range (unless otherwise noted).
What is the PSRR vs frequency performance of the INA293A1?
The PSRR is flat at 120 dB from 10 Hz to ~1 kHz.
What is the quiescent current (iq) with the power supply?
The quiescent current (iq) with the power supply is 1.5 mA.
What is the output response time of the INA293A1 under the condition of a 75-A threshold on a 2-mΩ shunt with VS = 5 V?
The output response time is < 2 µs.
What is the settling time for the INA293A1 when VOUT = 4 V ± 0.1 V step and the output settles to 1%?
The settling time is 5 µs.
What is the slew rate of the INA293A1 during the rising edge of the frequency response?
The slew rate is 2.5 V/µs.